Atomic Structure and Nuclear Physics
491 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which subatomic particle was discovered by J.J. Thomson?

  • Photon
  • Proton
  • Electron (correct)
  • Neutron

In what year did James Chadwick discover the neutron?

  • 1932 (correct)
  • 1897
  • 1895
  • 1919

Who discovered radioactivity in uranium compounds?

  • Pierre Curie
  • Antoine Henri Becquerel (correct)
  • Wilhelm Conrad Rontgen
  • Marie Curie

What is the approximate radius of an atom?

<p>$10^{-10}$ meters (D)</p> Signup and view all the answers

What does the atomic mass of an atom represent?

<p>Sum of neutrons and protons (B)</p> Signup and view all the answers

What is the relationship between atomic number and the number of protons in an atom?

<p>Atomic number is equal to the number of protons (C)</p> Signup and view all the answers

Which of the following did Pierre and Marie Curie isolate?

<p>Polonium and Radium (A)</p> Signup and view all the answers

What is the relationship between atomic mass, neutron number, and proton number?

<p>Atomic mass = neutron number + proton number (C)</p> Signup and view all the answers

What subatomic particle is equal to the atomic number?

<p>Electron (C)</p> Signup and view all the answers

The radius of a nucleus is determined using what equation?

<p>$R = r_0 A^{1/3}$ (B)</p> Signup and view all the answers

What force overcomes electrostatic repulsion between protons in the nucleus?

<p>Strong nuclear force (A)</p> Signup and view all the answers

What is the name given to atoms with the same number of neutrons but a different number of protons?

<p>Isotones (D)</p> Signup and view all the answers

What is the name given to atoms with the same mass number but a different atomic number?

<p>Isobars (C)</p> Signup and view all the answers

What is the classification for $^{14}_6C$ and $^{12}_6C$?

<p>Isotopes (A)</p> Signup and view all the answers

What process involves two light nuclei combining to form a larger nucleus, releasing energy?

<p>Fusion (D)</p> Signup and view all the answers

What is the definition of 'binding energy' in the context of nuclear physics?

<p>The energy required to separate a nucleus into its individual protons and neutrons (B)</p> Signup and view all the answers

An unstable element that emits radiation is known as what?

<p>Radioisotope (C)</p> Signup and view all the answers

Which formula is used to calculate half-life?

<p>$t_{1/2} = 0.693/k$ (B)</p> Signup and view all the answers

What is the mass of a nucleon measured in?

<p>Atomic mass units (C)</p> Signup and view all the answers

What describes the rate at which radiation energy is deposited in matter?

<p>Linear Energy Transfer (C)</p> Signup and view all the answers

What happens to cell survival rates as Linear Energy Transfer (LET) increases?

<p>Cell survival rates decrease. (D)</p> Signup and view all the answers

What type of particle is emitted during beta decay?

<p>A high-energy electron (B)</p> Signup and view all the answers

What is the charge of a beta particle?

<p>-1 (D)</p> Signup and view all the answers

In positron emission, what transformation occurs within the nucleus?

<p>A proton is converted into a neutron (A)</p> Signup and view all the answers

What is a gamma ray?

<p>A high-energy form of electromagnetic radiation (A)</p> Signup and view all the answers

Which type of decay almost always accompanies the loss of a nuclear particle?

<p>Gamma (B)</p> Signup and view all the answers

What is the process called when one nucleus is transformed into another through particle bombardment?

<p>Nuclear transmutation (A)</p> Signup and view all the answers

Which of the following differentiates nuclear transmutation from radioactive decay?

<p>It is caused by a collision (A)</p> Signup and view all the answers

What happens to a heavy nucleus during nuclear fission?

<p>It splits into lighter nuclei (D)</p> Signup and view all the answers

What is generated during the process of nuclear fission, other than lighter nuclei?

<p>Free neutrons (A)</p> Signup and view all the answers

What occurs during nuclear fusion?

<p>Two light nuclei combine to form a heavier one (B)</p> Signup and view all the answers

What defines a radioactive decay?

<p>The release of radiation by radioisotopes (C)</p> Signup and view all the answers

What is an alpha particle equivalent to?

<p>A helium nucleus (A)</p> Signup and view all the answers

What is the common type of decay for elements with an atomic number greater than 83?

<p>Alpha decay (A)</p> Signup and view all the answers

What is the primary factor in determining the stability of an isotope?

<p>Neutron-to-proton ratio (A)</p> Signup and view all the answers

What characterizes an unstable atom?

<p>It spontaneously emits energy (B)</p> Signup and view all the answers

Which of the following is an example of a naturally occurring radioactive element?

<p>Uranium (D)</p> Signup and view all the answers

Elements with an atomic number greater than what value are generally unstable?

<p>83 (B)</p> Signup and view all the answers

What happens to the mass number during alpha decay?

<p>Decreases by 4 (B)</p> Signup and view all the answers

What is the term for radioactive isotopes?

<p>Radioisotopes (D)</p> Signup and view all the answers

Which of the following is an example of an artificial radioactive element?

<p>Technetium (B)</p> Signup and view all the answers

What is the smallest unit of matter?

<p>Atom (A)</p> Signup and view all the answers

What is the relationship between the number of protons, neutrons and the atomic mass?

<p>Atomic mass = Protons + Neutrons (B)</p> Signup and view all the answers

Which elements were isolated by Marie and Pierre Curie?

<p>Polonium and Radium (D)</p> Signup and view all the answers

In what year was radioactivity discovered in uranium compounds?

<p>1896 (B)</p> Signup and view all the answers

What does the atomic number represent?

<p>Number of protons (D)</p> Signup and view all the answers

What process involves two light nuclei combining to form a larger nucleus?

<p>Nuclear fusion (A)</p> Signup and view all the answers

What is 'binding energy'?

<p>The energy required to separate a nucleus into its individual protons and neutrons (C)</p> Signup and view all the answers

What is half-life?

<p>The time it takes for half of the atoms in a radioactive sample to decay (D)</p> Signup and view all the answers

What is Linear Energy Transfer (LET)?

<p>The rate at which radiation energy is deposited in matter (D)</p> Signup and view all the answers

What is the term for the total number of protons and neutrons in a nucleus?

<p>Nucleon number (B)</p> Signup and view all the answers

What force is responsible for holding the nucleus together, despite the electrostatic repulsion between protons?

<p>Strong nuclear force (D)</p> Signup and view all the answers

What is the approximate value of $r_0$ in the nuclear radius equation $R = r_0 A^{1/3}$?

<p>1.2 fm (D)</p> Signup and view all the answers

What two components are equal to the atomic number?

<p>Protons and Electrons (D)</p> Signup and view all the answers

What is the relationship between atomic mass, neutrons, and protons?

<p>Atomic mass is the sum of neutrons and protons. (D)</p> Signup and view all the answers

At what atomic number are isotopes considered unstable?

<p>Greater than 83 (C)</p> Signup and view all the answers

What term describes atoms with the same number of protons but different numbers of neutrons?

<p>Isotopes (D)</p> Signup and view all the answers

What term describes atoms with the same mass number but different numbers of protons?

<p>Isobars (D)</p> Signup and view all the answers

What term describes atoms with the same number of neutrons but different numbers of protons?

<p>Isotones (C)</p> Signup and view all the answers

What characterizes a radioisotope?

<p>It releases radiation. (B)</p> Signup and view all the answers

What is the composition of an alpha particle?

<p>Two protons and two neutrons. (B)</p> Signup and view all the answers

What is the primary decay mode for elements with an atomic number greater than 83?

<p>Alpha decay. (D)</p> Signup and view all the answers

What defines radioactivity?

<p>The spontaneous emission of energy from an unstable atom. (C)</p> Signup and view all the answers

Which of the following is an example of a natural radioactive element?

<p>Uranium. (B)</p> Signup and view all the answers

What is the general trend for elements with atomic numbers greater than 83?

<p>They are unstable. (D)</p> Signup and view all the answers

What happens to the mass number of an atom during alpha decay?

<p>It decreases by 4. (C)</p> Signup and view all the answers

What is the role of the neutron-to-proton ratio in determining nuclear stability?

<p>It influences nuclear stability; certain ratios confer greater stability. (A)</p> Signup and view all the answers

What is the classification for Uranium-238?

<p>Natural radioactive element. (A)</p> Signup and view all the answers

What is a beta particle?

<p>A high-energy electron with a -1 charge (C)</p> Signup and view all the answers

During positron emission, what happens to a proton in the nucleus?

<p>It is converted into a neutron (C)</p> Signup and view all the answers

Gamma decay typically occurs with what other type(s) of decay?

<p>Alpha or beta decay (D)</p> Signup and view all the answers

What is the process of nuclear transmutation?

<p>The transformation of one nucleus into another through particle bombardment (B)</p> Signup and view all the answers

What is emitted during beta minus decay?

<p>An electron (B)</p> Signup and view all the answers

During positron emission, what particle is emitted from the nucleus?

<p>A positron (B)</p> Signup and view all the answers

Who discovered the proton?

<p>Ernest Rutherford (B)</p> Signup and view all the answers

What two subatomic particles are used to calculate atomic mass?

<p>Protons and neutrons (D)</p> Signup and view all the answers

What is the relationship between the number of protons and the atomic number?

<p>The atomic number is equal to the number of protons. (C)</p> Signup and view all the answers

What two subatomic particles make up the mass number?

<p>Protons and neutrons (C)</p> Signup and view all the answers

What is the approximate radius of most nuclei?

<p>$R = r_0 A^{1/3}$ (D)</p> Signup and view all the answers

What is the value of the experimentally determined constant $r_0$ used to calculate nuclear radius?

<p>1.2 fm (A)</p> Signup and view all the answers

What describes an element which is emitting radiation?

<p>A radioisotope (A)</p> Signup and view all the answers

Which of the following describes the relationship between the neutron-to-proton ratio and nuclear stability?

<p>A suitable n/p ratio is required for stability. (D)</p> Signup and view all the answers

What is another name for radioactive isotopes?

<p>Radioisotopes (C)</p> Signup and view all the answers

What is the neutron-to-proton ratio used for?

<p>Finding nuclear stability (B)</p> Signup and view all the answers

What is produced by humans?

<p>Artificial radioactivity (A)</p> Signup and view all the answers

What is released by radioactive isotopes?

<p>Radioactive decay (D)</p> Signup and view all the answers

What is the name of the process where two light nuclei combine to form a larger nucleus?

<p>Fusion (D)</p> Signup and view all the answers

What formula is used to calculate half-life involving the rate constant?

<p>$t_{1/2} = 0.693/k$ (C)</p> Signup and view all the answers

What trend is observed in cell survival rates as Linear Energy Transfer (LET) increases?

<p>Cell survival rates decrease. (D)</p> Signup and view all the answers

What type of particle is emitted during beta-minus decay?

<p>Electron (C)</p> Signup and view all the answers

During positron emission, what happens within the nucleus?

<p>A proton is converted into a neutron (A)</p> Signup and view all the answers

Gamma decay typically occurs with what?

<p>Alpha or beta decay (A)</p> Signup and view all the answers

In nuclear fission, what happens to a heavy nucleus?

<p>It splits into lighter nuclei (C)</p> Signup and view all the answers

What is generated during nuclear fission, other than lighter nuclei?

<p>Free neutrons (A)</p> Signup and view all the answers

During beta plus decay, what particle is emitted from the nucleus?

<p>Positron (B)</p> Signup and view all the answers

During beta minus decay, what is emitted from the nucleus?

<p>Electron (B)</p> Signup and view all the answers

What year was the proton discovered?

<p>1919 (C)</p> Signup and view all the answers

In what year did Wilhelm Conrad Rontgen discover X-rays?

<p>1895 (A)</p> Signup and view all the answers

What particles are used to calculate atomic mass?

<p>Neutrons and protons (D)</p> Signup and view all the answers

Fluorine has an atomic number of 9 and a mass number of 19. How many neutrons does it have?

<p>10 (A)</p> Signup and view all the answers

What is the charge of a beta particle emitted during beta decay?

<p>-1 (D)</p> Signup and view all the answers

In positron emission, what happens to a proton within the nucleus?

<p>It is converted into a neutron. (C)</p> Signup and view all the answers

What is the term for the energy required to separate a nucleus into individual protons and neutrons?

<p>Binding Energy (A)</p> Signup and view all the answers

What process involves two smaller nuclei combining to form a larger nucleus?

<p>Nuclear Fusion (B)</p> Signup and view all the answers

Which of the following describes half-life?

<p>The time it takes for half of the radioactive atoms in a sample to decay. (A)</p> Signup and view all the answers

What does Linear Energy Transfer (LET) measure?

<p>The rate at which radiation energy is deposited in matter. (A)</p> Signup and view all the answers

What is released during radioactive decay?

<p>Radiation (C)</p> Signup and view all the answers

What is the name given when the number of protons and neutrons are combined?

<p>Mass number (D)</p> Signup and view all the answers

What is the other name for mass number?

<p>Nucleon number (C)</p> Signup and view all the answers

What determines the chemical element of an atom?

<p>Number of protons (C)</p> Signup and view all the answers

In an electrically neutral atom, what is equal to the number of protons?

<p>Number of electrons (A)</p> Signup and view all the answers

What force is responsible for holding the protons and neutrons together in the nucleus?

<p>Strong nuclear force (D)</p> Signup and view all the answers

Which of the following is produced artificially?

<p>Technetium (C)</p> Signup and view all the answers

What is the term for atoms with the same number of protons but different numbers of neutrons?

<p>Isotopes (C)</p> Signup and view all the answers

What characterizes isotopes with odd numbers of both protons and neutrons?

<p>They are the least stable (C)</p> Signup and view all the answers

What is the term for atoms with the same mass number but different numbers of protons?

<p>Isobars (A)</p> Signup and view all the answers

What is the term for atoms with the same number of neutrons but different numbers of protons?

<p>Isotones (A)</p> Signup and view all the answers

How many stable isotopes are there with odd numbers of both protons and neutrons?

<p>5 (A)</p> Signup and view all the answers

If an atom has an atomic number of 17 and a mass number of 35, what is the number of neutrons in its nucleus?

<p>18 (B)</p> Signup and view all the answers

Which of the following describes the relationship between the strong nuclear force and the distance separating nucleons?

<p>The strong nuclear force is only effective at extremely short distances. (A)</p> Signup and view all the answers

If a radioactive isotope has a half-life of 10 years, approximately what fraction of the original sample will remain after 30 years?

<p>1/8 (B)</p> Signup and view all the answers

What is primarily responsible for the large amounts of energy released in nuclear fusion reactions?

<p>Conversion of mass into energy. (D)</p> Signup and view all the answers

Which of the following applications is an example of the beneficial use of radiation?

<p>Sterilizing medical equipment. (B)</p> Signup and view all the answers

A radiation detector registers a certain count rate. If a thin sheet of paper is placed between the detector and the source, the count rate decreases significantly. What type of radiation is most likely being detected?

<p>Alpha Radiation (A)</p> Signup and view all the answers

How does the binding energy per nucleon relate to the stability of a nucleus?

<p>Higher binding energy per nucleon indicates higher stability. (D)</p> Signup and view all the answers

Why does the understanding of half-life have practical significance?

<p>It is essential for estimating the time required for radioactive material to decay to a safe level. (B)</p> Signup and view all the answers

How is Linear Energy Transfer (LET) related to the potential harm caused by radiation?

<p>Higher LET radiation deposits more energy per unit length and causes more biological harm. (A)</p> Signup and view all the answers

If a nucleus is separated into individual protons and neutrons, what happens to the total energy of the system?

<p>The total energy increases, and the mass increases. (C)</p> Signup and view all the answers

A radioactive sample has a half-life of 10 years. Approximately what fraction of the original sample will remain after 30 years?

<p>1/8 (B)</p> Signup and view all the answers

Which of the following best describes the relationship between radiation type, Linear Energy Transfer (LET), and biological harm?

<p>Alpha particles, with high LET, cause more localized biological harm due to their dense energy deposition. (A)</p> Signup and view all the answers

What fundamental change occurs in the nucleus during positron emission?

<p>A proton is converted into a neutron. (A)</p> Signup and view all the answers

Which of the following best characterizes a gamma ray?

<p>High-energy electromagnetic radiation. (A)</p> Signup and view all the answers

Given the atomic mass of 23 and the atomic number of 11 for Sodium (Na), what is the number of neutrons in its nucleus?

<p>12 (C)</p> Signup and view all the answers

For Xenon (Xe) with an atomic mass of 131 and an atomic number of 54, how many neutrons are present in the nucleus?

<p>77 (A)</p> Signup and view all the answers

Gamma decay typically accompanies the emission of what?

<p>Either alpha or beta particles. (C)</p> Signup and view all the answers

Tungsten (W) has 74 protons and 110 neutrons. What is the atomic mass of Tungsten?

<p>184 (C)</p> Signup and view all the answers

What is the key distinction between nuclear transmutation and radioactive decay?

<p>Nuclear transmutation is induced by particle bombardment, whereas radioactive decay is a spontaneous process. (B)</p> Signup and view all the answers

What is the approximate radius of a nucleus with a nucleon number (A) of 64, using the formula $R = r_0 A^{1/3}$ and $r_0 = 1.2 \text{ fm}$?

<p>4.8 fm (D)</p> Signup and view all the answers

What is the fundamental process that defines nuclear fission?

<p>A heavy nucleus splitting into lighter nuclei. (D)</p> Signup and view all the answers

Beyond lighter nuclei, what else is characteristically generated during nuclear fission?

<p>Both free neutrons and energy. (C)</p> Signup and view all the answers

Two atoms have the same number of neutrons but different numbers of protons. What term describes these atoms?

<p>Isotones (D)</p> Signup and view all the answers

What is the defining characteristic of nuclear fusion?

<p>The combination of two light nuclei. (A)</p> Signup and view all the answers

Which of the following pairs of atoms are isotopes?

<p>$^{12}<em>{6}C$ and $^{13}</em>{6}C$ (B)</p> Signup and view all the answers

What force is primarily responsible for preventing the nucleus from flying apart due to the electrostatic repulsion between protons?

<p>Strong nuclear force (D)</p> Signup and view all the answers

Which of the following describes the charge and identity of a beta particle?

<p>A negatively charged electron. (D)</p> Signup and view all the answers

Which process describes a nucleus being transformed into another through particle bombardment?

<p>Nuclear transmutation (B)</p> Signup and view all the answers

What is a key factor in determining the stability of a nucleus?

<p>The neutron-to-proton ratio (D)</p> Signup and view all the answers

An element is considered a radioisotope if it lies:

<p>Above or below the band of stability. (A)</p> Signup and view all the answers

What occurs when a nucleus ejects a positron?

<p>The atomic number decreases by one. (D)</p> Signup and view all the answers

Which neutron-to-proton ratio generally corresponds to the least stable nuclei?

<p>Odd number of protons and odd number of neutrons. (C)</p> Signup and view all the answers

What characteristic defines artificial radioactivity?

<p>Production of radioactive isotopes through human intervention. (A)</p> Signup and view all the answers

What is a key characteristic of alpha decay?

<p>It involves the emission of a helium nucleus. (D)</p> Signup and view all the answers

A Californium-248 ($^{248}_{96}Cf$) nucleus undergoes alpha decay. What are the resulting mass number and atomic number of the daughter nucleus, respectively?

<p>244 and 94 (D)</p> Signup and view all the answers

Which of the following lists contains only examples of elements that exhibit natural radioactivity?

<p>Uranium, Actinium, Thorium (B)</p> Signup and view all the answers

What is emitted during alpha decay?

<p>A helium nucleus (A)</p> Signup and view all the answers

Why is an even number of protons and neutrons more stable?

<p>Due to paired nucleons (B)</p> Signup and view all the answers

Which type of decay is most common for elements with an atomic number greater than 83?

<p>Alpha decay (C)</p> Signup and view all the answers

Which of the following is a characteristic of radioisotopes?

<p>They emit radiation spontaneously. (A)</p> Signup and view all the answers

If a nucleus with a mass of 20u splits into two smaller nuclei, one with a mass of 5u and another with a mass of 12u, what is the mass defect, assuming no free neutrons are released?

<p>3u (A)</p> Signup and view all the answers

What is the relationship between atomic number and the number of electrons in a neutral atom?

<p>The number of electrons is equal to the atomic number. (A)</p> Signup and view all the answers

What is the relationship between Linear Energy Transfer (LET) and the penetrating ability of radiation?

<p>Lower LET corresponds to greater penetration. (D)</p> Signup and view all the answers

If an atom of oxygen has an atomic number of 8 and a mass number of 16, how many neutrons are present in its nucleus?

<p>8 (D)</p> Signup and view all the answers

Which of the fundamental forces is responsible for holding the protons and neutrons together within the nucleus of an atom?

<p>Strong nuclear force (C)</p> Signup and view all the answers

A tumor is irradiated with gamma rays having an RBE of 1. If an equivalent biological effect is desired using fast neutrons with an RBE of 3, how should the dose be adjusted compared to the dose of the gamma rays?

<p>Reduce the neutron dose by a factor of 3. (A)</p> Signup and view all the answers

Which of the following statements best describes the role of neutrons in nuclear stability?

<p>Neutrons dilute the concentration of protons, reducing electrostatic repulsion and contributing to stability. (A)</p> Signup and view all the answers

What happens to the atomic number and mass number of an element when it undergoes beta-minus decay?

<p>Atomic number increases by 1, mass number remains the same. (D)</p> Signup and view all the answers

In the context of nuclear fission, what is the role of a 'critical mass'?

<p>The minimum mass of fissile material required to sustain a nuclear chain reaction. (D)</p> Signup and view all the answers

What distinguishes nuclear fusion from nuclear fission in terms of energy release and the size of the nuclei involved?

<p>Fusion involves the combining of light nuclei and releases more energy than fission. (A)</p> Signup and view all the answers

An isotope has 88 protons and 138 neutrons. Is this isotope likely to be stable, and why?

<p>Stable, because both the number of protons and neutrons are even. (D)</p> Signup and view all the answers

Which of the following is a characteristic of artificial radioactivity?

<p>It involves isotopes produced by humans. (A)</p> Signup and view all the answers

Given the atomic mass and number, how would you calculate the number of neutrons in an atom of Xenon (Xe)?

<p>Subtract the atomic number from the atomic mass. (D)</p> Signup and view all the answers

An unstable atom spontaneously emits energy. What classifies this process?

<p>Radioactivity (C)</p> Signup and view all the answers

Using the equation $R = r_0 A^{1/3}$, where $r_0 = 1.2 \text{ fm}$, what does 'A' represent?

<p>The nucleon number. (A)</p> Signup and view all the answers

If two atoms have the same number of neutrons but a different number of protons, what are they called?

<p>Isotones (B)</p> Signup and view all the answers

Consider the alpha decay of Uranium-238 ($^{238}_{92}U$). Which of the following correctly represents the resulting daughter nucleus after the decay?

<p>$^{234}_{90}Th$ (C)</p> Signup and view all the answers

Which of the following properties is characteristic of radioisotopes?

<p>They emit radiation. (D)</p> Signup and view all the answers

Considering Coulomb's law and the electrostatic repulsion between protons in the nucleus, what force counteracts this repulsion to maintain nuclear stability?

<p>Strong nuclear force (B)</p> Signup and view all the answers

What is the significance of the neutron-to-proton ratio (n/p) in determining the stability of a nucleus?

<p>It helps determine whether the nucleus falls within the band of stability. (C)</p> Signup and view all the answers

Which of the following lists contains only naturally occurring radioactive elements?

<p>Uranium, Actinium, and Thorium (B)</p> Signup and view all the answers

What is a key factor in determining whether an isotope is stable?

<p>The neutron-to-proton ratio in the nucleus. (C)</p> Signup and view all the answers

An element is described as being a 'radioisotope'. According to the properties of nuclei, what characteristic MUST this element have?

<p>It is unstable and emits radiation. (A)</p> Signup and view all the answers

Given that isotopes with an atomic number greater than 83 are generally unstable, what is the primary reason for this instability?

<p>The strong nuclear force is insufficient to overcome the electrostatic repulsion between the large number of protons. (D)</p> Signup and view all the answers

Actinium-227 ($^{227}_{89}Ac$) undergoes alpha decay. What are the atomic number and mass number of the resulting daughter nucleus?

<p>Atomic number 87, mass number 223 (D)</p> Signup and view all the answers

Two different atoms have nucleon number $A = 40$, but one has 18 protons and the other has 20 protons. What term describes these atoms?

<p>Isobars (B)</p> Signup and view all the answers

Consider an isotope with an even number of protons and an odd number of neutrons. How does this generally affect its nuclear stability compared to isotopes with even numbers of both protons and neutrons?

<p>Less stable (D)</p> Signup and view all the answers

If a newly discovered element contains 126 neutrons and 82 protons, which of the following statements are true?

<p>It is unstable because its atomic number is greater than 83. (B)</p> Signup and view all the answers

In beta-minus decay, what change occurs within the nucleus?

<p>A neutron is converted into a proton, and an electron is emitted. (C)</p> Signup and view all the answers

During positron emission, what happens to the atomic number of the resulting nucleus?

<p>Decreases by 1. (C)</p> Signup and view all the answers

Which of the following best describes a gamma ray?

<p>A high-energy form of electromagnetic radiation with no charge or mass. (C)</p> Signup and view all the answers

Why does gamma decay typically accompany other forms of nuclear decay, such as alpha or beta decay?

<p>To dissipate excess energy from the nucleus after particle emission. (D)</p> Signup and view all the answers

What distinguishes nuclear transmutation from natural radioactive decay?

<p>Nuclear transmutation involves bombardment by subatomic particles or ions to induce nuclear change. (A)</p> Signup and view all the answers

During nuclear fission, besides lighter nuclei, what else is characteristically released?

<p>A large amount of energy and free neutrons. (C)</p> Signup and view all the answers

Which of the following statements accurately describes what occurs during nuclear fusion?

<p>Two light nuclei combine to form a heavier nucleus, releasing energy. (B)</p> Signup and view all the answers

What is the role of neutrons produced during nuclear fission in a nuclear chain reaction?

<p>They initiate subsequent fission events by bombarding other heavy nuclei. (D)</p> Signup and view all the answers

In what way does the mass of the resultant nucleus in nuclear fusion compare to the sum of the masses of the original nuclei?

<p>The mass of the resultant nucleus is less than the sum of the original masses; the difference is converted into energy. (A)</p> Signup and view all the answers

Which of the following is a fundamental difference between nuclear fission and nuclear fusion regarding the size of the nuclei involved?

<p>Fission involves only heavy nuclei, while fusion involves only light nuclei. (B)</p> Signup and view all the answers

Considering the historical progression of atomic discoveries, what key advancement directly enabled Chadwick's discovery of the neutron in 1932?

<p>The development of particle accelerators, allowing for more precise manipulation of atomic nuclei. (A)</p> Signup and view all the answers

Isotopes of an element have the same number of protons but different numbers of neutrons. How does this difference in neutron number primarily affect the isotope's properties?

<p>It affects the nuclear stability of the isotope, influencing its radioactive properties. (C)</p> Signup and view all the answers

Marie and Pierre Curie isolated polonium and radium based on their radioactivity. What property of these elements made this isolation process particularly challenging?

<p>Their presence in extremely small quantities within the source material. (C)</p> Signup and view all the answers

Consider two isotopes of the same element, one stable and one radioactive. Which statement correctly describes the difference in their nuclear binding energy per nucleon?

<p>The stable isotope has a higher binding energy per nucleon, making it more resistant to decay. (B)</p> Signup and view all the answers

If a radioactive isotope has a half-life of 10 years, approximately how much of the original sample will remain after 30 years?

<p>1/8 (D)</p> Signup and view all the answers

In nuclear fission, a heavy nucleus splits into lighter nuclei, releasing a significant amount of energy. What fundamental principle explains the source of this energy?

<p>The mass difference between the original nucleus and the fission products, according to $E=mc^2$. (D)</p> Signup and view all the answers

Radiation is used beneficially in several applications. Which of the following relies on radiation's ability to damage or destroy cells?

<p>Cancer therapy (B)</p> Signup and view all the answers

When light nuclei undergo nuclear fusion to form a larger nucleus, what happens to the overall stability and energy of the system?

<p>The resulting nucleus is more stable, and energy is released. (A)</p> Signup and view all the answers

If a sample of a radioactive isotope has a half-life of 10 years, approximately what fraction of the original sample will remain after 30 years?

<p>1/8 (D)</p> Signup and view all the answers

Given that Tungsten (W) has an atomic number of 74 and 110 neutrons, what is its atomic mass?

<p>184 (D)</p> Signup and view all the answers

What is the relationship between Linear Energy Transfer (LET) and the biological effects of radiation?

<p>Higher LET radiation generally causes more biological damage due to greater energy deposition per unit length. (B)</p> Signup and view all the answers

If an element has an atomic mass of 23 and 12 neutrons in its nucleus, what is the number of protons and electrons?

<p>11 protons and 11 electrons (D)</p> Signup and view all the answers

What is the binding energy of a nucleus, and on what factors does it depend?

<p>The energy required to separate a nucleus into its constituent protons and neutrons; it depends on the mass defect. (D)</p> Signup and view all the answers

How does the strong nuclear force counteract the electrostatic repulsion between protons within the nucleus?

<p>By a fundamental force that attracts nucleons to each other (B)</p> Signup and view all the answers

Consider two atoms: $^{40}{18}Ar$ and $^{40}{20}Ca$. Which term correctly describes the relationship between these two atoms?

<p>Isobars (D)</p> Signup and view all the answers

A tumor is treated with 30 Gy of X-rays, and the same biological effect could be achieved with 10 Gy of alpha particles. What is the Relative Biological Effectiveness (RBE) of the alpha particles compared to the X-rays?

<p>3 (D)</p> Signup and view all the answers

Consider two atoms: $^{16}{8}O$ and $^{17}{8}O$. Which term correctly describes the relationship between these two atoms?

<p>Isotopes (D)</p> Signup and view all the answers

What is true for radioisotopes, regarding the band of stability?

<p>They lie either above or below the band of stability. (A)</p> Signup and view all the answers

An unknown element has 85 protons and 125 neutrons. Is this element stable or unstable?

<p>Unstable, because isotopes with an atomic number greater than 83 are generally unstable. (C)</p> Signup and view all the answers

Using the formula $R = r_0 A^{1/3}$, and knowing that $r_0 ≈ 1.2 \times 10^{-15} m$, estimate the radius of a nucleus with a nucleon number (A) of 64.

<p>4.8 fm (C)</p> Signup and view all the answers

Which neutron-to-proton ratio (n/p) typically correlates with the least nuclear stability?

<p>Odd number of protons and odd number of neutrons. (B)</p> Signup and view all the answers

What characteristic defines a natural radioactive element?

<p>Exists spontaneously in nature. (D)</p> Signup and view all the answers

What is conserved in a balanced nuclear decay equation?

<p>Both the mass number and the atomic number. (C)</p> Signup and view all the answers

An element undergoes alpha decay. How does this affect its atomic number?

<p>Decreases by 2. (D)</p> Signup and view all the answers

Which of the following elements is most likely to undergo alpha decay?

<p>Polonium (Po, Z = 84). (B)</p> Signup and view all the answers

What constitutes an alpha particle?

<p>A helium nucleus. (A)</p> Signup and view all the answers

What distinguishes artificial radioactivity from natural radioactivity?

<p>Artificial radioactivity is induced by human intervention, while natural radioactivity occurs spontaneously. (C)</p> Signup and view all the answers

Which factor primarily determines whether a nuclide will undergo radioactive decay?

<p>Its neutron-to-proton ratio and total number of nucleons. (C)</p> Signup and view all the answers

How does alpha decay change the mass number of a radioactive nuclide?

<p>Decreases by 4. (C)</p> Signup and view all the answers

If Californium-248 ($^{248}_{96}Cf$) undergoes alpha decay, what is the resulting nuclide?

<p>$^{244}_{94}Pu$ (A)</p> Signup and view all the answers

In beta-minus decay, what change occurs within the nucleus of the decaying atom?

<p>A neutron is converted into a proton, and an electron is emitted. (C)</p> Signup and view all the answers

Which of the following best describes the energy and nature of a gamma ray emitted during gamma decay?

<p>A high-energy form of electromagnetic radiation with no charge or mass. (A)</p> Signup and view all the answers

What fundamental difference distinguishes nuclear transmutation from natural radioactive decay?

<p>Nuclear transmutation is induced by particle bombardment, while radioactive decay is a spontaneous process. (A)</p> Signup and view all the answers

In the process of nuclear fission, what is the primary reason a large amount of energy is released?

<p>The heavy nucleus gains stability by splitting into lighter nuclei. (D)</p> Signup and view all the answers

What is the key characteristic of nuclear fusion that distinguishes it from nuclear fission?

<p>Fusion involves the combination of light nuclei, while fission involves the splitting of a heavy nucleus. (A)</p> Signup and view all the answers

If a magnesium-26 ($^{26}_{12}Mg$) nucleus undergoes beta-minus decay, what is the resulting nucleus?

<p>Aluminum-26 ($^{26}_{13}Al$) (C)</p> Signup and view all the answers

What is the primary purpose of bombarding a nucleus with subatomic particles or ions in nuclear transmutation?

<p>To transform the original nucleus into a different nucleus. (C)</p> Signup and view all the answers

Which of the following is a direct consequence of a nucleus undergoing positron emission?

<p>The atomic number decreases by one. (C)</p> Signup and view all the answers

Why does gamma decay typically accompany other forms of radioactive decay, such as alpha or beta decay?

<p>Alpha or beta decay may leave the nucleus in an excited state, which then transitions to a lower energy state by emitting a gamma ray. (C)</p> Signup and view all the answers

What is the role of free neutrons generated during nuclear fission in a nuclear chain reaction?

<p>To initiate further fission events in other heavy nuclei. (D)</p> Signup and view all the answers

Considering the historical timeline of nuclear physics, what was discovered first?

<p>The electron (B)</p> Signup and view all the answers

Given that an atom's radius is approximately $10^{-10}$ meters, what order of magnitude represents the size of the nucleus within that atom?

<p>$10^{-15}$ meters (D)</p> Signup and view all the answers

An atom of plutonium has an atomic number of 94 and a mass number of 244. How many neutrons are in the nucleus of this atom?

<p>150 (A)</p> Signup and view all the answers

If Uranium-238 ($^{238}_{92}U$) undergoes alpha decay, what are the atomic and mass numbers of the resulting nucleus?

<p>Atomic number: 90, Mass number: 234 (A)</p> Signup and view all the answers

Which of the following is a direct application of Marie and Pierre Curie's discovery of radioactivity?

<p>Medical imaging techniques using radioisotopes (C)</p> Signup and view all the answers

Considering the timeline of discoveries in nuclear physics, which event directly enabled the development of nuclear fission reactors?

<p>Discovery of the neutron by James Chadwick (D)</p> Signup and view all the answers

Which of the following is an example of a practical application of the properties of the atomic nucleus?

<p>Harnessing nuclear fission in power plants to generate electricity (B)</p> Signup and view all the answers

What fundamental force counteracts the electrostatic repulsion between protons within the nucleus, maintaining its stability?

<p>Strong nuclear force (C)</p> Signup and view all the answers

Given that the atomic mass of Sodium (Na) is 23 and it has 12 neutrons, how many protons does it have?

<p>11 (A)</p> Signup and view all the answers

If two atoms have the same mass number but different atomic numbers, how are they classified?

<p>Isobars (D)</p> Signup and view all the answers

Which of the following factors primarily determines the stability of a nucleus?

<p>The neutron-to-proton ratio (A)</p> Signup and view all the answers

Using the formula $R = r_0A^{1/3}$, where $r_0 = 1.2 \text{ fm}$ and $A$ is the nucleon number, what is the approximate radius of a nucleus with a nucleon number of 64?

<p>4.8 fm (A)</p> Signup and view all the answers

What is a common characteristic of radioisotopes?

<p>They emit radiation to become more stable. (B)</p> Signup and view all the answers

Which of the following statements accurately relates nucleon number and atomic mass?

<p>Nucleon number is approximately equal to atomic mass expressed in atomic mass units. (A)</p> Signup and view all the answers

How are two nuclides with the same neutron number but different proton numbers classified?

<p>Isotones (C)</p> Signup and view all the answers

An element has an atomic number greater than 83. What can be generally inferred about its isotopes?

<p>All of its isotopes are radioactive. (B)</p> Signup and view all the answers

Why is the concept of half-life important in the context of radioactive materials?

<p>It indicates the time required for a radioactive substance to decay to half of its initial quantity, aiding in safety and storage considerations. (C)</p> Signup and view all the answers

A radioactive sample initially contains 400 grams of a radioactive isotope. After two half-lives, how much of the radioactive isotope remains?

<p>100 grams (B)</p> Signup and view all the answers

In the context of biological radiation effects, what does Relative Biological Effectiveness (RBE) indicate?

<p>The ability of different types of radiation to produce varying degrees of biological damage for the same absorbed dose. (C)</p> Signup and view all the answers

What is the significance of binding energy in the context of nuclear stability?

<p>It represents the energy required to disassemble a nucleus into its individual protons and neutrons, indicating the strength of the nuclear force. (B)</p> Signup and view all the answers

Which of the following particles is emitted during gamma decay?

<p>Photon (D)</p> Signup and view all the answers

What is the key difference between nuclear transmutation and radioactive decay?

<p>Nuclear transmutation requires external intervention, while radioactive decay occurs spontaneously. (D)</p> Signup and view all the answers

Which of the following is a characteristic product of nuclear fission?

<p>Two light nuclei and several free neutrons. (C)</p> Signup and view all the answers

What is the primary requirement for nuclear fusion to occur?

<p>High temperature and high density. (A)</p> Signup and view all the answers

During beta-minus decay ($β^-$), what change occurs within the nucleus?

<p>A neutron is converted into a proton. (B)</p> Signup and view all the answers

Which type of decay is most likely to accompany the emission of an alpha or beta particle?

<p>Gamma Decay (D)</p> Signup and view all the answers

In nuclear transmutation, what is the role of the bombarding particle?

<p>To induce a change in the composition of the nucleus. (C)</p> Signup and view all the answers

Which process results in the formation of a heavier nucleus from two lighter nuclei?

<p>Nuclear Fusion (D)</p> Signup and view all the answers

What is conserved in both nuclear fission and nuclear fusion reactions?

<p>Charge (A)</p> Signup and view all the answers

What is a key factor in determining whether a nuclide will undergo alpha decay?

<p>The atomic number of the nuclide being greater than 83. (D)</p> Signup and view all the answers

Which of the following contributes to the relative instability of a nuclide with an odd number of both protons and neutrons?

<p>Unstable pairing configurations of nucleons. (B)</p> Signup and view all the answers

What is the significance of 'magic numbers' (2, 8, 20, 28, 50, 82, 126) in nuclear stability?

<p>They correspond to filled nuclear shells, leading to enhanced stability. (C)</p> Signup and view all the answers

How artificial radioactivity differ from natural radioactivity?

<p>Artificial radioactivity is induced by humans, while natural occurs spontaneously. (B)</p> Signup and view all the answers

An isotope undergoes alpha decay. How do the atomic number (Z) and mass number (A) of the daughter nucleus change?

<p>Z decreases by 2, A decreases by 4 (A)</p> Signup and view all the answers

Which of the following comparisons regarding nuclear stability is most accurate?

<p>Nuclides with even numbers of both protons and neutrons are generally more stable than nuclides with odd numbers of either protons or neutrons. (A)</p> Signup and view all the answers

Given the nuclear reaction: $^{238}_{92}U \longrightarrow X + ^4_2He$, identify the daughter nucleus X.

<p>$^{234}_{90}Th$ (A)</p> Signup and view all the answers

Which of the following best describes the process of radioactive decay?

<p>The spontaneous emission of energy from an unstable nucleus. (D)</p> Signup and view all the answers

What is the role of neutron-to-proton ratio (n/p) in determining the stability of a nucleus?

<p>The optimal n/p ratio for stability increases with increasing atomic number. (D)</p> Signup and view all the answers

Francium is an example of what type of radioactivity?

<p>Artificial (B)</p> Signup and view all the answers

Consider two isotopes of the same element. Which statement accurately describes their atomic composition?

<p>They have the same number of protons but a different number of neutrons. (B)</p> Signup and view all the answers

If an element has an atomic number of 20, how many protons and electrons does it have, respectively, assuming it is a neutral atom?

<p>20 protons and 20 electrons (C)</p> Signup and view all the answers

How would you calculate the number of neutrons in an atom, given its atomic mass and atomic number?

<p>Subtract the atomic number from the atomic mass (B)</p> Signup and view all the answers

Consider the following scenario: An atom undergoes alpha decay. What changes occur to its atomic number and mass number?

<p>Atomic number decreases by 2, mass number decreases by 4 (C)</p> Signup and view all the answers

Which of the following best explains the role of the strong nuclear force?

<p>It holds nucleons together within the nucleus. (D)</p> Signup and view all the answers

What is the key factor that determines whether an isotope is stable or unstable?

<p>The ratio of neutrons to protons in the nucleus (D)</p> Signup and view all the answers

A radioactive substance has a half-life of 10 years. Approximately what fraction of the original sample will remain after 30 years?

<p>1/8 (C)</p> Signup and view all the answers

During nuclear fusion, what is the primary condition required for two light nuclei to combine?

<p>Extremely high temperatures to overcome the electrostatic repulsion between the nuclei. (D)</p> Signup and view all the answers

If a nuclide of Radium-226 has a half-life of 1600 years, approximately how much of a 100 gram sample will remain after 4800 years?

<p>12.5 grams (D)</p> Signup and view all the answers

Given that the half-life of a certain isotope is 10 years, what fraction of the original sample will remain after 30 years?

<p>$1/8$ (D)</p> Signup and view all the answers

Consider a scenario where a scientist is deciding between using X-rays (LET = 3 keV/µm) and alpha particles (LET = 150 keV/µm) for cancer radiation therapy. Which of the following statements is most accurate?

<p>Alpha particles will cause more biological harm due to their higher LET, leading to more concentrated energy deposition and greater ionization density. (C)</p> Signup and view all the answers

A tumor is treated with 40 Gy of gamma rays (RBE = 1). To achieve an equivalent biological effect using fast neutrons (RBE = 3), what dose should be administered?

<p>13.3 Gy (A)</p> Signup and view all the answers

If a newly discovered element has an atomic number of 118, what can be predicted about its stability?

<p>It will likely be unstable because its atomic number is greater than 83. (D)</p> Signup and view all the answers

Which of the following describes the relationship between nucleon number (A), number of neutrons (N), and number of protons (Z) in a nucleus?

<p>$A = N + Z$ (D)</p> Signup and view all the answers

Given that the experimentally determined value of $r_0$ in the nuclear radius equation is approximately 1.2 fm, what is the approximate radius of a nucleus with a nucleon number of 64?

<p>4.8 fm (D)</p> Signup and view all the answers

If two atoms have the same mass number but different atomic numbers, what term describes them?

<p>Isobars (B)</p> Signup and view all the answers

What primarily determines whether a nucleus will undergo radioactive decay?

<p>Unfavorable neutron-to-proton ratio. (D)</p> Signup and view all the answers

Which force is primarily responsible for holding the protons and neutrons together within the nucleus of an atom, overcoming electrostatic repulsion?

<p>Strong nuclear force (C)</p> Signup and view all the answers

If an element has 50 protons, 50 electrons and 70 neutrons, what is its nucleon number?

<p>120 (C)</p> Signup and view all the answers

Given two atoms, $^{40}{18}Ar$ and $^{40}{20}Ca$, what term describes their relationship?

<p>Isobars (A)</p> Signup and view all the answers

If a Sodium (Na) atom has an atomic mass of 23, how many protons does does it have?

<p>11 (A)</p> Signup and view all the answers

What characteristic of an atom primarily determines whether it will undergo alpha decay?

<p>An atomic number greater than 83. (D)</p> Signup and view all the answers

Which of the following describes a radioisotope?

<p>An isotope that emits radiation spontaneously. (B)</p> Signup and view all the answers

What is the defining characteristic of artificial radioactivity?

<p>It is induced by human activity, such as nuclear reactions. (C)</p> Signup and view all the answers

What is the composition of an alpha particle emitted during radioactive decay?

<p>A helium nucleus with two protons and two neutrons. (A)</p> Signup and view all the answers

In an alpha decay process, how does the mass number of the parent nucleus change?

<p>Decreases by 4. (A)</p> Signup and view all the answers

Which of the following factors contributes to the overall stability of a nucleus?

<p>A neutron-to-proton ratio close to one for lighter elements. (B)</p> Signup and view all the answers

How does the process of radioactive decay affect the stability of an atom?

<p>It moves the atom closer to a stable neutron-to-proton ratio. (A)</p> Signup and view all the answers

What distinguishes natural radioactive elements like uranium from artificial radioactive elements like technetium?

<p>Natural elements are found in nature, while artificial elements are produced in reactors or accelerators. (B)</p> Signup and view all the answers

Which of the following is a balanced representation of alpha decay for Plutonium-242 ($^{242}_{94}Pu$)?

<p>$^{242}<em>{94}Pu \rightarrow ^{238}</em>{92}U + ^4_2He$ (B)</p> Signup and view all the answers

How does pair production relate to nuclear stability?

<p>It involves the creation of matter and antimatter, which can affect the energy balance within the nucleus. (B)</p> Signup and view all the answers

Which of the following best describes a key difference between nuclear transmutation and radioactive decay?

<p>Nuclear transmutation is induced by external bombardment, while radioactive decay is a spontaneous process. (C)</p> Signup and view all the answers

What is the fundamental process that occurs during positron emission?

<p>A proton transforms into a neutron by emitting a positron. (B)</p> Signup and view all the answers

Which of the following statements accurately describes the role of gamma radiation in nuclear decay processes?

<p>Gamma radiation is a high-energy electromagnetic radiation that often accompanies alpha or beta decay to remove excess energy from the nucleus. (D)</p> Signup and view all the answers

What is a characteristic product of nuclear fission, besides lighter nuclei?

<p>Free neutrons (C)</p> Signup and view all the answers

In nuclear fusion, what is the primary condition required for the reaction to occur?

<p>High temperature and high density (A)</p> Signup and view all the answers

Which statement correctly describes the difference in the products of nuclear fission versus nuclear fusion?

<p>Fission produces lighter nuclei while fusion produces a heavier nucleus. (B)</p> Signup and view all the answers

How does the mass of the product nucleus in nuclear fission compare to the mass of the original nucleus?

<p>It is less, as some of the mass is converted into energy. (C)</p> Signup and view all the answers

What is the role of 'bombardment by sub-atomic particles or ions' in nuclear transmutation?

<p>To induce a change in the composition of the nucleus, creating a new element or isotope. (D)</p> Signup and view all the answers

Which of the following is a common application of nuclear transmutation?

<p>Creating and studying transuranic elements. (D)</p> Signup and view all the answers

Considering the historical development of nuclear physics, how did the discovery of the neutron by James Chadwick influence the understanding of atomic structure?

<p>It explained the existence of isotopes and the variation in atomic masses of the same element. (B)</p> Signup and view all the answers

Why is the strong nuclear force essential for the stability of atomic nuclei?

<p>It overcomes the electrostatic repulsion between protons. (B)</p> Signup and view all the answers

How would the isolation of Polonium and Radium advance understanding of radioactivity?

<p>They provided intensely radioactive sources for further study. (A)</p> Signup and view all the answers

Fluorine has an atomic number of 9 and a mass number of 19, what is the number of neutrons?

<p>10 (C)</p> Signup and view all the answers

How did the discovery of X-rays by Wilhelm Conrad Rontgen contribute to the field of nuclear physics?

<p>It opened new avenues for studying atomic structure and radiation, leading to further discoveries. (C)</p> Signup and view all the answers

Suppose an element undergoes alpha decay. How does this decay affect the atomic number and mass number of the resulting element?

<p>Atomic number decreases by 2, mass number decreases by 4 (C)</p> Signup and view all the answers

Given that the atomic number of Sodium (Na) is 11, what is the number of protons and electrons?

<p>11 protons, 11 electrons (B)</p> Signup and view all the answers

If the number of protons in Xenon (Xe) is 54, what is its atomic number?

<p>54 (B)</p> Signup and view all the answers

In nuclear physics, what is the relationship between binding energy and the stability of a nucleus?

<p>Higher binding energy indicates a more stable nucleus as more energy is required to break it apart. (D)</p> Signup and view all the answers

Tungsten (W) has an atomic mass of 184 and 74 protons. How many neutrons does it have?

<p>110 (A)</p> Signup and view all the answers

A radioactive sample of Radium-226 has a half-life of 1600 years. Approximately how long will it take for the activity of the sample to decrease to 1/4 of its original value?

<p>3200 years (A)</p> Signup and view all the answers

What is the approximate radius of a nucleus with a nucleon number (A) of 64, given $r_0 = 1.2 \text{ fm}$?

<p>4.8 fm (C)</p> Signup and view all the answers

A patient receives radiation therapy with X-rays at a dose of 4 Gy. If alpha particles, which have a Relative Biological Effectiveness (RBE) of 10, were used instead, what dose of alpha particles would produce the same biological effect?

<p>0.4 Gy (C)</p> Signup and view all the answers

Two atoms have the same number of neutrons but different numbers of protons. What are they called?

<p>Isotones (C)</p> Signup and view all the answers

Which of the following statements is correct regarding the stability of isotopes?

<p>Isotopes with atomic numbers greater than 83 are generally unstable. (B)</p> Signup and view all the answers

In the context of nuclear reactions, what is nuclear fusion?

<p>The combination of two light nuclei to form a heavier nucleus, releasing energy. (C)</p> Signup and view all the answers

What is the relationship between atomic number, neutron number, and atomic mass?

<p>Atomic Mass = Atomic Number + Neutron Number (C)</p> Signup and view all the answers

What primarily counteracts the electrostatic repulsion between protons within the nucleus?

<p>Strong Nuclear Force (A)</p> Signup and view all the answers

Given two atoms, $^{40}{18}Ar$ and $^{40}{20}Ca$, how are they classified?

<p>Isobars (C)</p> Signup and view all the answers

Which of the following isotopes would be considered the least stable based on the number of protons and neutrons?

<p>An isotope with an odd number of protons and an odd number of neutrons (B)</p> Signup and view all the answers

What defines artificial radioactivity?

<p>The release of radiation from isotopes created through human intervention. (D)</p> Signup and view all the answers

Which of the following is a characteristic of all natural noble gases?

<p>They are all stable. (B)</p> Signup and view all the answers

If Californium-248 ($^{248}_{96}Cf$) undergoes alpha decay, what are the resulting products?

<p>$^{244}_{94}Pu + ^4_2He$ (A)</p> Signup and view all the answers

Which of the following is an example of an element that undergoes artificial radioactivity?

<p>Technetium (D)</p> Signup and view all the answers

What happens to the mass number and atomic number of an element that undergoes alpha decay?

<p>Mass number decreases by 4, atomic number decreases by 2. (B)</p> Signup and view all the answers

Which of the following statements best describes the process of radioactivity?

<p>The spontaneous emission of energy from unstable atoms. (C)</p> Signup and view all the answers

What factor determines whether a radioisotope will undergo radioactive decay?

<p>The specific ratio of neutrons to protons in the nucleus (A)</p> Signup and view all the answers

Which of the following elements do not exist naturally?

<p>Francium (B)</p> Signup and view all the answers

What characterizes a gamma ray?

<p>A high-energy form of electromagnetic radiation without mass or charge. (A)</p> Signup and view all the answers

Why does gamma decay typically accompany other forms of radioactive decay?

<p>To release excess energy from the nucleus after particle emission. (B)</p> Signup and view all the answers

Which of the following occurs during nuclear fission?

<p>A heavy nucleus splits into lighter nuclei. (B)</p> Signup and view all the answers

Besides lighter nuclei, what else is typically generated during nuclear fission?

<p>Free neutrons. (B)</p> Signup and view all the answers

What is the primary process occurring during nuclear fusion?

<p>The combination of two light nuclei to form a heavier nucleus. (D)</p> Signup and view all the answers

Magnesium-26 ($^{26}{12}Mg$) decays into Aluminum-26 ($^{26}{13}Al$) during what type of decay?

<p>Beta-minus decay (C)</p> Signup and view all the answers

Silver-35 ($^{35}{18}Ag$) decays into Chlorine-35 ($^{35}{17}Cl$) during what type of decay?

<p>Positron emission (A)</p> Signup and view all the answers

What is the mass and charge of a beta particle?

<p>is a high energy electron with a -1 charge (B)</p> Signup and view all the answers

What is the key outcome of two light nuclei combining through nuclear fusion?

<p>Release of an appreciable amount of energy and formation of a more stable, larger nucleus. (A)</p> Signup and view all the answers

Why is it important to understand the concept of half-life in the context of radioactive materials?

<p>To assess the biological hazards and safety requirements associated with radioactive materials over time. (A)</p> Signup and view all the answers

A radioactive sample of nitrogen-16 decays from 400.0 g to 50.0 g in 28 seconds. What is the half-life of nitrogen-16?

<p>9.33 seconds (A)</p> Signup and view all the answers

If a tumor receives a dose of 40 Gy from X-rays (RBE = 1), what dose of alpha particles (RBE = 10) would be required to achieve the same biological effect?

<p>4 Gy (C)</p> Signup and view all the answers

If an atom of uranium-235 ($^{235}_{92}U$) undergoes fission and releases 3 neutrons, what is the mass number of the resulting primary fission fragment, assuming no mass is lost in the process?

<p>140 (D)</p> Signup and view all the answers

Which of the following is the most accurate analogy for the role of the strong nuclear force?

<p>A spring that pulls nucleons together, resisting both compression and stretching. (C)</p> Signup and view all the answers

Given that the atomic mass of Sodium (Na) is 23 and it has 12 neutrons, what is its atomic number?

<p>11 (A)</p> Signup and view all the answers

A radioactive isotope has a half-life of 10 days. If you start with a 100g sample, approximately how much of the isotope will remain after 30 days?

<p>12.5g (C)</p> Signup and view all the answers

Tungsten (W) has an atomic number of 74 and 110 neutrons. What is its atomic mass?

<p>184 (D)</p> Signup and view all the answers

Consider two isotopes of the same element. Which statement accurately compares their chemical behavior and nuclear stability?

<p>They have similar chemical behaviors and different nuclear stabilities. (D)</p> Signup and view all the answers

If two atoms have the same mass number but different atomic numbers, what are they called?

<p>Isobars (C)</p> Signup and view all the answers

Which of the following is a potential risk associated with using radiation in medical treatments, such as radiation therapy for cancer?

<p>The development of secondary cancers due to DNA damage in healthy tissues. (B)</p> Signup and view all the answers

Which neutron-to-proton ratio typically correlates with the least nuclear stability?

<p>Odd number of protons and odd number of neutrons (C)</p> Signup and view all the answers

How does an increase in Linear Energy Transfer (LET) typically affect the Relative Biological Effectiveness (RBE) of radiation?

<p>RBE generally increases with LET up to a point, then decreases at very high LET values. (B)</p> Signup and view all the answers

Which force is responsible for holding the nucleus together, counteracting the electrostatic repulsion between protons?

<p>Strong Nuclear Force (D)</p> Signup and view all the answers

An isotope has 84 protons and 126 neutrons. Based on the provided information, what decay mode is it most likely to undergo?

<p>Alpha decay (A)</p> Signup and view all the answers

An atom has 8 protons and 9 neutrons. Is this atom stable, how do we know this?

<p>The stability cannot be determined without more information about its binding energy. (A)</p> Signup and view all the answers

A sample containing a mixture of radioactive isotopes is measured with a detector. Which change in the setup could improve the energy resolution of the detector, allowing for more precise identification of the isotopes present?

<p>Cooling the detector to reduce thermal noise. (D)</p> Signup and view all the answers

What is the defining characteristic of a 'radioisotope'?

<p>It emits energy spontaneously. (D)</p> Signup and view all the answers

If an element has an atomic number greater than 83, what can be generally inferred about its stability?

<p>It is unstable due to the increased electrostatic repulsion in the nucleus. (A)</p> Signup and view all the answers

Two atoms are considered isotones. Which of the following is true regarding these atoms?

<p>They have the same number of neutrons but different numbers of protons. (D)</p> Signup and view all the answers

Which of the following is an example of an element that exists naturally and is radioactive?

<p>Actinium (C)</p> Signup and view all the answers

How does the mass number (A) change when an atom undergoes alpha decay?

<p>Decreases by 4 (C)</p> Signup and view all the answers

Using the formula $R = r_0 A^{1/3}$ to estimate nuclear radius, if $r_0 = 1.2 \text{ fm}$ and $A = 64$, what is the approximate radius of the nucleus?

<p>4.8 fm (D)</p> Signup and view all the answers

Why is the neutron-to-proton ratio important for nuclear stability?

<p>It helps balance the repulsive electrostatic forces between protons in the nucleus. (A)</p> Signup and view all the answers

In the context of nuclear stability, what is the significance of 'magic numbers'?

<p>They represent particularly stable configurations of protons and neutrons. (A)</p> Signup and view all the answers

Which of the following is an example of an element that is artificially produced?

<p>Technetium (C)</p> Signup and view all the answers

A Californium-248 ($^{248}_{96}Cf$) nucleus undergoes alpha decay. What are the resulting atomic and mass numbers of the daughter nucleus?

<p>Atomic number = 94, Mass number = 244 (D)</p> Signup and view all the answers

Which type of radiation is described as a helium nucleus with two protons and two neutrons?

<p>Alpha Particle (A)</p> Signup and view all the answers

What process refers to the release of radiation by radioactive isotopes?

<p>Radioactive Decay (C)</p> Signup and view all the answers

Which of the following best describes the energy and nature of a gamma ray?

<p>A high-energy form of electromagnetic radiation with no charge. (A)</p> Signup and view all the answers

How does nuclear transmutation differ from radioactive decay?

<p>Nuclear transmutation involves the collision with sub-atomic particles, while radioactive decay is a spontaneous process. (A)</p> Signup and view all the answers

What best describes the process of nuclear fission?

<p>A heavy nucleus splits into lighter nuclei, releasing energy and neutrons. (D)</p> Signup and view all the answers

What is the primary product, other than a heavier nucleus, of nuclear fusion?

<p>Release of large amount of energy. (B)</p> Signup and view all the answers

What is the role of free neutrons in nuclear fission?

<p>To initiate and sustain the chain reaction. (C)</p> Signup and view all the answers

Which type of decay usually accompanies the emission of an alpha or beta particle?

<p>Gamma decay. (C)</p> Signup and view all the answers

In positron emission, what change occurs within the nucleus?

<p>A proton is converted into a neutron. (D)</p> Signup and view all the answers

Which of the following equations accurately represents beta-minus decay of Carbon-14 ($^{14}_6C$)?

<p>$^{14}_6C \rightarrow ^{14}<em>7N + ^0</em>{-1}e$ (B)</p> Signup and view all the answers

Which process is primarily responsible for the energy production in the Sun?

<p>Nuclear fusion of hydrogen isotopes. (C)</p> Signup and view all the answers

Which subatomic particles contribute significantly to the mass of an atom?

<p>Protons and Neutrons (D)</p> Signup and view all the answers

If an atom has an atomic number of 17 and a mass number of 35, how many neutrons are in its nucleus?

<p>18 (D)</p> Signup and view all the answers

Which of the following is a correct statement regarding the relative penetrating power of alpha, beta, and gamma radiation?

<p>Gamma radiation is more penetrating than both alpha and beta particles. (C)</p> Signup and view all the answers

A radioactive isotope has a half-life of 10 years. If you start with a 100 gram sample, approximately how much of the isotope will remain after 30 years?

<p>12.5 grams (A)</p> Signup and view all the answers

In nuclear fission, a heavy nucleus splits into lighter nuclei. What is the primary reason this process releases a significant amount of energy?

<p>The daughter nuclei have a higher binding energy per nucleon than the original nucleus. (C)</p> Signup and view all the answers

How does nuclear fusion, the process that powers the Sun, differ from nuclear fission, used in nuclear power plants?

<p>Fusion requires extremely high temperatures and pressures, while fission occurs at relatively lower temperatures. (D)</p> Signup and view all the answers

Which of the following best describes the relationship between Linear Energy Transfer (LET) and cell survival rates?

<p>As LET increases, cell survival rates decrease. (C)</p> Signup and view all the answers

What is the relationship between the energy released during nuclear fusion and the stability of the resulting nucleus?

<p>More energy is released when more stable nuclei are formed. (A)</p> Signup and view all the answers

A radioactive sample initially contains 500 grams of a certain isotope. After two half-lives, how much of the isotope remains?

<p>125 grams (B)</p> Signup and view all the answers

Given that the Relative Biological Effectiveness (RBE) of alpha particles is 5 when compared to X-rays, what does this imply about the biological damage caused by equal doses of the two types of radiation?

<p>Alpha particles will cause five times more biological damage than X-rays. (C)</p> Signup and view all the answers

A patient receives a dose of 30 Gy from radiation with an RBE of 2. What is the equivalent dose received by the patient?

<p>60 Gy (D)</p> Signup and view all the answers

Using the information provided, which of the following statements correctly describes the number of protons and electrons in a neutral atom?

<p>The number of protons is equal to the number of electrons. (D)</p> Signup and view all the answers

What is the nucleon number (A) of an atom?

<p>The total number of protons and neutrons in the nucleus. (C)</p> Signup and view all the answers

Given the equation for nuclear radius $R ≈ r_0A^{1/3}$, if the constant $r_0$ is 1.2 fm and the nucleon number (A) of an atom is 64, what is the approximate radius of the nucleus?

<p>4.8 fm (D)</p> Signup and view all the answers

Two atoms are considered isobars if they have:

<p>The same mass number (A) but different atomic numbers (Z). (B)</p> Signup and view all the answers

What force counteracts the electrostatic repulsion between protons within the nucleus, preventing it from flying apart?

<p>Strong nuclear force (B)</p> Signup and view all the answers

Based on the concept of nuclear stability, which of the following is most likely to be an unstable isotope?

<p>An isotope with a very high atomic number (greater than 83). (D)</p> Signup and view all the answers

What characteristic defines a radioisotope?

<p>Exhibiting radioactivity due to an unstable nucleus. (D)</p> Signup and view all the answers

Which factor primarily determines the stability of a nucleus regarding the neutron-to-proton ratio?

<p>A neutron-to-proton ratio that is either too high or too low. (C)</p> Signup and view all the answers

Which of the following best describes positron emission?

<p>Emission of a particle with the same mass as an electron but with a positive charge from the nucleus. (B)</p> Signup and view all the answers

What is the fundamental difference between nuclear transmutation and radioactive decay?

<p>Nuclear transmutation is induced by external bombardment, whereas radioactive decay is a spontaneous process. (A)</p> Signup and view all the answers

Which of the following must occur for nuclear fission to be initiated?

<p>A heavy nucleus must absorb a neutron. (D)</p> Signup and view all the answers

What is the primary product of nuclear fusion, besides a heavier nucleus?

<p>Gamma radiation and energy (D)</p> Signup and view all the answers

Which of the following statements accurately describes gamma decay?

<p>It involves the emission of high-energy photons without changing the atomic number or mass number. (D)</p> Signup and view all the answers

In the context of nuclear reactions, what best describes 'bombardment'?

<p>Colliding a nucleus with subatomic particles or ions to induce a nuclear reaction. (A)</p> Signup and view all the answers

Why does nuclear fission release a large amount of energy?

<p>Because the heavy nucleus is less stable than its products, and the difference in binding energy is released. (B)</p> Signup and view all the answers

An atom of Californium-248 ($^{248}_{96}Cf$) undergoes alpha decay. What are the resulting mass and atomic numbers of the daughter nucleus?

<p>Mass number = 244, Atomic number = 94 (A)</p> Signup and view all the answers

Which of the following poses the greatest challenge for achieving sustained nuclear fusion as a power source?

<p>Achieving and maintaining the extremely high temperatures and pressures required to overcome electrostatic repulsion. (D)</p> Signup and view all the answers

Which of the following numbers of protons and neutrons would likely result in a stable isotope?

<p>2 protons and 4 neutrons (B)</p> Signup and view all the answers

What process characterizes radioactivity?

<p>The spontaneous emission of energy from an unstable atom. (A)</p> Signup and view all the answers

An isotope has 8 protons and 10 neutrons. What is its neutron-to-proton ratio?

<p>1.25 (A)</p> Signup and view all the answers

Why are elements with atomic numbers greater than 83 generally unstable?

<p>The strong nuclear force is insufficient to overcome the electrostatic repulsion between the numerous protons. (D)</p> Signup and view all the answers

If Plutonium-244 ($^{244}_{94}Pu$) undergoes alpha decay, which of the following correctly represents the resulting decay equation?

<p>$^{244}<em>{94}Pu \rightarrow ^{240}</em>{92}U + ^4_2He$ (A)</p> Signup and view all the answers

Which of the following statements best describes the relationship between atomic number, neutron number, and atomic mass?

<p>Atomic mass equals the number of neutrons plus the atomic number (number of protons). (D)</p> Signup and view all the answers

In nuclear physics, what is the relationship between the binding energy of a nucleus and its stability?

<p>Higher binding energy indicates higher stability, as more energy is required to separate the nucleus into its constituent nucleons. (B)</p> Signup and view all the answers

If a certain radioactive isotope has a half-life of 10 years, approximately how much of a 200g sample of that isotope will remain after 30 years?

<p>25g (D)</p> Signup and view all the answers

If an atom of an element has an atomic number of 20 and an atomic mass of 40, how many neutrons are present in the nucleus?

<p>20 (D)</p> Signup and view all the answers

Consider two isotopes of the same element. Which statement accurately describes their similarities and differences?

<p>They have the same number of protons but different numbers of neutrons. (C)</p> Signup and view all the answers

What is the purpose of calculating the mass defect in nuclear physics?

<p>To find the difference between the mass of a nucleus and the sum of the masses of its individual nucleons, which can then be used to find the binding energy. (C)</p> Signup and view all the answers

How does Linear Energy Transfer (LET) relate to the potential harm of radiation?

<p>Higher LET radiation is generally more harmful because it deposits more energy per unit length, leading to greater biological damage. (C)</p> Signup and view all the answers

In Rutherford's gold foil experiment, most alpha particles passed through undeflected. What conclusion was drawn from this observation?

<p>The atom is mostly empty space. (A)</p> Signup and view all the answers

Which of the following sequences correctly lists the scientists in chronological order of their key discoveries related to atomic structure and radioactivity?

<p>Wilhelm Conrad Rontgen, Antoine Henri Becquerel, J.J. Thomson, Ernest Rutherford (A)</p> Signup and view all the answers

If a tumor is irradiated with 30 Gy of X-rays (RBE = 1), what dose of alpha particles (RBE = 10) would be required to achieve the same biological effect?

<p>3 Gy (C)</p> Signup and view all the answers

An atom has 9 protons and a mass number of 19. How many neutrons does this atom have?

<p>10 (D)</p> Signup and view all the answers

How does the isolation of polonium and radium by Marie and Pierre Curie contribute to our understanding of radioactivity?

<p>It demonstrated that specific elements, other than uranium, possess significant radioactivity. (B)</p> Signup and view all the answers

Xenon (Xe) has an atomic mass of 131 and an atomic number of 54. How many neutrons does it have?

<p>77 (B)</p> Signup and view all the answers

Two atoms are considered to be isobars if they have the same:

<p>Mass number (D)</p> Signup and view all the answers

Which of the following describes isotopes?

<p>Atoms with the same number of protons but different numbers of neutrons (A)</p> Signup and view all the answers

What primarily counteracts the electrostatic repulsion between protons within the nucleus of an atom?

<p>Strong nuclear force (C)</p> Signup and view all the answers

What is the name given to atoms with the same neutron number but different proton number?

<p>Isotones (A)</p> Signup and view all the answers

An isotope is considered a radioisotope if it falls:

<p>Outside the band of stability (A)</p> Signup and view all the answers

An element with an atomic number greater than which value is generally unstable?

<p>83 (A)</p> Signup and view all the answers

Which neutron-to-proton ratio generally correlates with the LEAST stable nuclei?

<p>Odd number of protons and odd number of neutrons (D)</p> Signup and view all the answers

Which of the following elements would most likely undergo alpha decay?

<p>Polonium (Z = 84) (A)</p> Signup and view all the answers

Francium is artificially produced, what type of radioactivity is it?

<p>Artificial (A)</p> Signup and view all the answers

Consider the alpha decay of Uranium-238 ($^{238}_{92}U$). What are the products of this decay?

<p>$^{234}_{90}Th$ and $^4_2He$ (D)</p> Signup and view all the answers

Why are isotopes with a high neutron-to-proton ratio more likely to undergo beta decay?

<p>To increase the number of protons and decrease the number of neutrons, moving towards a stable n/p ratio. (A)</p> Signup and view all the answers

Which of the following is a characteristic of natural radioactivity?

<p>It occurs spontaneously in unstable isotopes. (C)</p> Signup and view all the answers

What distinguishes nuclear transmutation from radioactive decay?

<p>Nuclear transmutation is induced by external factors such as particle bombardment, whereas radioactive decay is a spontaneous process. (D)</p> Signup and view all the answers

How does the emission of an alpha particle affect the mass number and atomic number of a radioactive nucleus?

<p>Mass number decreases by 4, atomic number decreases by 2. (D)</p> Signup and view all the answers

If Magnesium-26 ($^{26}_{12}Mg$) undergoes beta-minus decay, what is the resulting nucleus?

<p>Aluminum-26 ($^{26}_{13}Al$) (C)</p> Signup and view all the answers

Which of the following best describes the energy characteristics of a gamma ray?

<p>High-energy electromagnetic radiation with no mass or charge. (A)</p> Signup and view all the answers

Which of these elements would you expect to be radioactive?

<p>Actinium (Ac, Z = 89) (D)</p> Signup and view all the answers

What is the fundamental process that occurs during nuclear fusion?

<p>Two light nuclei combine to form a heavier nucleus, releasing energy. (A)</p> Signup and view all the answers

What is the role of neutrons in a nuclear fission reaction?

<p>They are generated during the process and can induce fission in other nuclei, sustaining a chain reaction. (D)</p> Signup and view all the answers

What is the change in atomic number when a nucleus undergoes positron emission?

<p>Decreases by 1 (D)</p> Signup and view all the answers

What is the change in atomic mass when a nucleus undergoes gamma radiation?

<p>No change (D)</p> Signup and view all the answers

What typically accompanies gamma decay?

<p>Beta or alpha decay (D)</p> Signup and view all the answers

Which of the following is the correct relationship between atomic mass (A), number of neutrons (N), and number of protons (Z) in an atom?

<p>$A = N + Z$ (D)</p> Signup and view all the answers

Why is the strong nuclear force necessary for the stability of the nucleus?

<p>It overcomes the electrostatic repulsion between protons. (D)</p> Signup and view all the answers

An element has a half-life of 10 days. What fraction of the original sample will remain after 30 days?

<p>$1/8$ (C)</p> Signup and view all the answers

Which of the following correctly describes the process of nuclear fission?

<p>A heavy nucleus splits into two or more lighter nuclei. (A)</p> Signup and view all the answers

What is a primary difference between nuclear fission and nuclear fusion?

<p>Fission involves splitting a nucleus, while fusion involves combining nuclei. (B)</p> Signup and view all the answers

In medicine, radiation is used for both diagnosis and therapy. What characteristic of radiation is most important for its use in cancer therapy?

<p>Its ability to destroy or damage cells. (B)</p> Signup and view all the answers

Which of the following best describes the process of nuclear fusion?

<p>Two light nuclei combine to form a larger nucleus, releasing energy. (B)</p> Signup and view all the answers

What does 'binding energy' represent in the context of nuclear physics?

<p>The energy required to separate a nucleus into its constituent protons and neutrons. (B)</p> Signup and view all the answers

A sample of a radioactive isotope has a half-life of 10 days. If you start with 400 grams of the substance, how much will remain after 30 days?

<p>50 grams (C)</p> Signup and view all the answers

What is the relationship between Linear Energy Transfer (LET) and cell survival rates?

<p>As LET increases, cell survival rates decrease. (B)</p> Signup and view all the answers

If a tumor is irradiated with a dose of 30 Gy of X-rays and the same biological effect could be achieved with alpha particles which have an RBE of 10, what dose of alpha particles would be required?

<p>3 Gy (D)</p> Signup and view all the answers

Which of the following statements regarding nucleon number (A) is correct?

<p>It is the sum of protons and neutrons in the nucleus. (A)</p> Signup and view all the answers

If two atoms have the same number of neutrons but a different number of protons, they are classified as what?

<p>Isotones (A)</p> Signup and view all the answers

What force is primarily responsible for overcoming the electrostatic repulsion between protons within the nucleus, preventing it from flying apart?

<p>Strong Nuclear Force (C)</p> Signup and view all the answers

Given the nuclear radius equation $R = r_0 A^{1/3}$, what does 'A' represent?

<p>Mass number (B)</p> Signup and view all the answers

Given the nuclear radius equation $R = r_0 A^{1/3}$, and $r_0 = 1.2 \text{ fm}$, approximately what is the radius of carbon-12?

<p>$2. 6 \text{ fm}$ (A)</p> Signup and view all the answers

How is nuclear stability determined?

<p>Neutron-to-proton ratio, pair production, magic numbers (A)</p> Signup and view all the answers

What characteristic primarily determines whether an atom will undergo alpha decay?

<p>An atomic number greater than 83 (C)</p> Signup and view all the answers

Consider a hypothetical isotope with an odd number of protons and an odd number of neutrons. Based on the general rule, what level of stability would this isotope likely exhibit?

<p>Least stable (A)</p> Signup and view all the answers

Which of the following distinguishes artificial radioactivity from natural radioactivity?

<p>Artificial radioactivity is induced in a laboratory, while natural radioactivity occurs spontaneously in nature (D)</p> Signup and view all the answers

Which of the following properties is characteristic of alpha particles?

<p>Low penetration and high ionization (A)</p> Signup and view all the answers

Which of the following elements is most likely to undergo natural radioactive decay?

<p>Uranium (U) (A)</p> Signup and view all the answers

Which of the following gases are all stable?

<p>Helium, Neon, and Argon (C)</p> Signup and view all the answers

How does an unstable atom achieve stability through radioactive decay?

<p>By spontaneously emitting energy and particles (A)</p> Signup and view all the answers

Which of the following best describes Radioactive Decay?

<p>The release of radiation by radioactive isotopes (D)</p> Signup and view all the answers

How does the location of a radioactive material affect radiation exposure and safety protocols?

<p>Radiation exposure decreases exponentially with increased distance from the source, necessitating distance as a primary safety measure. (D)</p> Signup and view all the answers

Which of the following is a key characteristic of gamma decay?

<p>It involves the emission of a high-energy photon without changing the atomic mass or number. (C)</p> Signup and view all the answers

During nuclear fission, what role do free neutrons play in a chain reaction?

<p>They initiate further fission events by colliding with other heavy nuclei. (A)</p> Signup and view all the answers

Which process describes the combination of deuterium and tritium to form helium, releasing a large amount of energy?

<p>Nuclear fusion (D)</p> Signup and view all the answers

Why is nuclear fission energetically favorable for heavy nuclei?

<p>Heavy nuclei have lower binding energy per nucleon compared to the fission products. (D)</p> Signup and view all the answers

What distinguishes electron capture from positron emission?

<p>Electron capture involves the nucleus capturing an electron, while positron emission involves the emission of a positron. (A)</p> Signup and view all the answers

What is the role of high energy input in initiating nuclear fusion reactions?

<p>To overcome the electrostatic repulsion between the positively charged nuclei. (D)</p> Signup and view all the answers

How does the mass number of a nucleus change following gamma decay?

<p>Remains unchanged (B)</p> Signup and view all the answers

Flashcards

Atom

The smallest unit of matter, combining to form molecules.

Proton

Positively charged particle discovered by Ernest Rutherford in 1919, located in the nucleus.

Neutron

Neutral particle discovered by James Chadwick in 1932, located in the nucleus.

Atomic Mass

Atomic mass is approximately equal to the number of neutrons plus protons in the nucleus.

Signup and view all the flashcards

Atomic Number

The number of protons in the nucleus of an atom.

Signup and view all the flashcards

Isotope

Atoms with the same number of protons but different numbers of neutrons.

Signup and view all the flashcards

Electron

Negatively charged particle discovered by J.J. Thomson in 1897, orbiting the nucleus.

Signup and view all the flashcards

Nucleon Number (A)

Number of protons and neutrons in an atom's nucleus.

Signup and view all the flashcards

Atomic Mass Unit (amu)

A unit used to measure the mass of nucleons.

Signup and view all the flashcards

Nuclear Radius Constant

(1.2 fm). Used to estimate the size of a nucleus.

Signup and view all the flashcards

Isobars

Nuclei with the same mass number (A) but different atomic numbers (Z).

Signup and view all the flashcards

Strong Nuclear Force

The force that holds the nucleus together, overcoming proton repulsion.

Signup and view all the flashcards

Neutron-to-Proton Ratio (n/p)

The ratio of neutrons to protons in a stable nucleus.

Signup and view all the flashcards

Radioisotope

An unstable isotope that emits radiation.

Signup and view all the flashcards

Binding Energy

The energy needed to break a nucleus into individual protons and neutrons.

Signup and view all the flashcards

Nuclear Fusion

The process where two light nuclei combine to form a heavier, more stable nucleus, releasing energy.

Signup and view all the flashcards

Half-Life

The time required for half of the radioactive nuclei in a sample to decay.

Signup and view all the flashcards

Linear Energy Transfer (LET)

Rate at which radiation energy is deposited in matter.

Signup and view all the flashcards

Relative Biologic Effectiveness (RBE)

Describes the varying effects different types of radiation have on biological tissue.

Signup and view all the flashcards

Beta Particle (β)

A high-energy electron emitted during radioactive decay with a 1- charge.

Signup and view all the flashcards

Positron Emission

The emission of a positron from a nucleus, converting a proton into a neutron.

Signup and view all the flashcards

Gamma Ray (γ)

High-energy electromagnetic radiation emitted during radioactive decay, with no charge or mass.

Signup and view all the flashcards

Nuclear Transmutation

The transformation of one nucleus into another through bombardment by sub-atomic particles or ions.

Signup and view all the flashcards

Beta Decay

Loss of a beta particle (high-energy electron) during nuclear decay.

Signup and view all the flashcards

Gamma Decay

Loss of a gamma ray (high-energy radiation) during or after nuclear decay.

Signup and view all the flashcards

Electron Capture

A process where a nucleus captures an inner-shell electron.

Signup and view all the flashcards

Z > 83

Atoms with an atomic number greater than 83 tend to be unstable.

Signup and view all the flashcards

Alpha Decay (Z>83)

When an unstable atom has an atomic number greater than 83, it commonly undergoes alpha decay.

Signup and view all the flashcards

Magic Numbers (Nuclear Stability)

Certain numbers of protons or neutrons (2, 8, 20, 28, 50, 82, or 126) result in particularly stable nuclei.

Signup and view all the flashcards

Radioactivity

The spontaneous emission of energy from an unstable atom.

Signup and view all the flashcards

Radioactive Decay

The release of radiation by radioactive isotopes.

Signup and view all the flashcards

Alpha Decay

A type of radioactive decay where an atom emits an alpha particle.

Signup and view all the flashcards

Alpha Particle (α)

Consists of 2 protons and 2 neutrons is equivalent to a Helium nucleus.

Signup and view all the flashcards

Alpha Decay Equation

A reaction involving the loss of an alpha particle (helium nucleus). Mass and charge must be balanced on both sides of the equation.

Signup and view all the flashcards

Natural Radioactivity

Radioactivity occurring naturally, with examples such as uranium, actinium and thorium.

Signup and view all the flashcards

Band of Stability

A chart or graph that plots isotopes according to their number of protons and neutrons, which helps to illustrate nuclear stability.

Signup and view all the flashcards

Nuclear Radius

Determined experimentally, this is the average radius of most nuclei using the formula R = r₀A^(1/3).

Signup and view all the flashcards

Finding Neutrons

The number of neutrons in a nucleus can be found by subtracting the atomic number from the atomic mass.

Signup and view all the flashcards

Nuclear Instability

An unstable arrangement of particles in a nucleus will emit energy.

Signup and view all the flashcards

Nuclear Density

All nuclei have approximately the same density.

Signup and view all the flashcards

Neutron-to-Proton Ratio

A ratio used to assess nuclear stability. Nuclei must have these ratios within range to be considered stable

Signup and view all the flashcards

Nuclear Fusion Energy Release

Energy released when light nuclei combine to form a heavier, more stable nucleus.

Signup and view all the flashcards

Mass Defect

The difference between the mass of a nucleus and the sum of the masses of its individual nucleons.

Signup and view all the flashcards

Unequal Biologic Effect

Equal doses of different radiation types produce unequal biologic effects.

Signup and view all the flashcards

Even vs. Odd Nucleons

Nuclei with even numbers of both protons and neutrons tend to be more stable.

Signup and view all the flashcards

Magic Numbers (Nuclear)

Specific numbers of protons or neutrons (2, 8, 20, 28, 50, 82, 126) that lead to exceptionally stable nuclei.

Signup and view all the flashcards

Alpha decay process

An unstable atom emits an alpha particle, decreasing its atomic number by 2 and mass number by 4.

Signup and view all the flashcards

Artificial Radioactivity

Technetium, astatine, and francium are artificially produced and not found naturally.

Signup and view all the flashcards

Balancing Nuclear Equations

The principle that in a nuclear equation, the total mass number and atomic number must be the same on both sides.

Signup and view all the flashcards

Alpha Decay Dominance (Z > 83)

The most common type of decay for atoms with an atomic number greater than 83.

Signup and view all the flashcards

Artificial substance

Substances made artificially and not naturally occurring

Signup and view all the flashcards

Naturally produce substance

Substances that exist in the natural world

Signup and view all the flashcards

Production fo Helium nucleus

Is the ejection of a helium nucleus from the atom

Signup and view all the flashcards

Neutron-Induced Fission

Unstable heavy nuclei split into smaller, more stable nuclei after being struck by a high energy neutron.

Signup and view all the flashcards

Beta Minus Decay

A high energy electron is ejected from the nucleus, and in the process a neutron is converted into a proton.

Signup and view all the flashcards

Wilhelm Conrad Rontgen

Discovered X-rays in December 1895.

Signup and view all the flashcards

Antoine Henri Becquerel

Observed radioactivity emitted by uranium compounds in 1896.

Signup and view all the flashcards

Marie Curie

Isolated polonium and radium with Pierre Curie in 1898.

Signup and view all the flashcards

First Medical X-ray

The first medical use of X-rays was on January 23, 1896.

Signup and view all the flashcards

Molecules

Atoms bind together.

Signup and view all the flashcards

Fluorine Example

Fluorine has 9 protons and a mass number of 19.

Signup and view all the flashcards

Atom's Radius

The approximate size of an Atom, or radius of the electron's orbit.

Signup and view all the flashcards

Stability Band

A chart or a graph used to identify stable nuclei by plotting the number of protons vs neutrons.

Signup and view all the flashcards

Unstable Nucleus

An unstable nucleus will emit energy.

Signup and view all the flashcards

Biological Hazards of Radiation

The biological risk associated with exposure to radiation.

Signup and view all the flashcards

Alpha Particle

A helium nucleus emitted during alpha decay which contains 2 protons and 2 neutrons.

Signup and view all the flashcards

Emission of Helium Nucleus

Losing a particle with 2 protons and 2 neutrons (He nucleus).

Signup and view all the flashcards

Gamma Emission

Loss of a -ray (high-energy radiation that almost always accompanies the loss of a nuclear particle)

Signup and view all the flashcards

Nuclear Reaction

A process involving changes in the composition of a nucleus.

Signup and view all the flashcards

Nuclear Physics

The study of the nucleus, including its structure, properties, and reactions.

Signup and view all the flashcards

Röntgen's Discovery

Discovered X-rays in 1895.

Signup and view all the flashcards

Uses of Radiation

Medical and industrial uses, sterilization, and power generation.

Signup and view all the flashcards

Nuclear Binding Energy

Energy required to separate a nucleus into its constituent protons and neutrons.

Signup and view all the flashcards

Beta Particle

A high-energy electron emitted during beta decay process.

Signup and view all the flashcards

Gamma Ray

High-energy electromagnetic radiation emitted during radioactive decay.

Signup and view all the flashcards

Z > 83 (Instability)

Nuclei with more than 83 protons are generally unstable and radioactive.

Signup and view all the flashcards

Splitting Atoms

A process where a heavy nucleus splits into lighter ones, releasing energy.

Signup and view all the flashcards

Magic Numbers

Specific numbers of protons or neutrons that result in exceptionally stable nuclei.

Signup and view all the flashcards

Ejection of Particles

Process of ejected from the nucleus, and in the process a proton is converted into a neutron

Signup and view all the flashcards

Alpha Decay Reaction

Reactions where an alpha particle is emitted, reducing the mass number by 4 and the atomic number by 2.

Signup and view all the flashcards

Radioisotope (Radioactive isotope)

An unstable nucleus that spontaneously emits radiation.

Signup and view all the flashcards

Alpha Particle Emission

Loss of a particle with 2 protons and 2 neutrons (He nucleus).

Signup and view all the flashcards

Pair production

A process in which an electron and its antiparticle (positron) are created from electromagnetic energy

Signup and view all the flashcards

Radioisotope Stability

A radioactive isotope is one that lies outside the 'band of stability' on a neutron number vs proton number plot.

Signup and view all the flashcards

Atomic mass units

A unit used to measure the mass of nucleons.

Signup and view all the flashcards

Nuclear r₀

Constant used to calculate radius of nuclei.

Signup and view all the flashcards

Magic Numbers (Nuclear Physics)

2, 8, 20, 28, 50, 82, and 126. Nuclei with these numbers of protons or neutrons are particularly stable.

Signup and view all the flashcards

Nuclear Fusion Energy

Energy released when two light nuclei combine to form a single heavier nucleus.

Signup and view all the flashcards

Half-Life (t1/2)

The time it takes for half of the radioactive nuclei in a sample to decay.

Signup and view all the flashcards

Beneficial use of Radiation

Using radiation for beneficial purposes such as in medicine, industry, and scientific research

Signup and view all the flashcards

Radiation detection

Using equipment and techniques to measure radiation

Signup and view all the flashcards

Radiation Protection

Protecting people and the environment from the harmful effects of radiation

Signup and view all the flashcards

Discovery of X-ray

Wilhelm Conrad Rontgen's Discovery

Signup and view all the flashcards

Odd-Odd Nuclei

Isotopes with uneven numbers of protons and neutrons; generally less stable.

Signup and view all the flashcards

Balanced Nuclear Equation

Representation of radioactive decay showing conservation of mass and charge.

Signup and view all the flashcards

Binding Energy Definition

The energy needed to separate a nucleus entirely into its component protons and neutrons.

Signup and view all the flashcards

Half-Life Definition

The time required for half of the radioactive nuclei in a sample to decay.

Signup and view all the flashcards

Odd-Odd Nuclei (Stability)

Nuclei with an odd number of both protons and neutrons tend to be the least stable.

Signup and view all the flashcards

Even-Even Nuclei (Stability)

Nuclei with an even number of both protons and neutrons tend to be the most stable.

Signup and view all the flashcards

Beta Decay (β-)

A process where a beta particle is emitted, effectively converting a neutron into a proton.

Signup and view all the flashcards

Gamma Decay (γ)

A process in which gamma rays are emitted.

Signup and view all the flashcards

1919

Rutherford discovered the proton in what year?

Signup and view all the flashcards

Atomic number Z > 83

Ratio that can cause unstable nucleus

Signup and view all the flashcards

Magic Numbers for Stability

Technique used to determine nucleus's stability

Signup and view all the flashcards

What does Alpha particle consist of

Alpha particle consists of ___ and ___

Signup and view all the flashcards

Artificial substances examples

Technetium, astatine, and francium are produced by humans.

Signup and view all the flashcards

Loss of -Ray

Losing energy in the form of electromagnetic radiation.

Signup and view all the flashcards

Proton Conversion

When a positron is emitted, a proton is converted into a neutron.

Signup and view all the flashcards

Radioactive isotopes

Isotopes that emit radiation sponataneously

Signup and view all the flashcards

Beta (β-) Decay

Loss of a beta particle (high-energy electron) from a nucleus.

Signup and view all the flashcards

Gamma (γ) Decay

The loss of a gamma ray during radioactive decay.

Signup and view all the flashcards

Electrostatic Repulsion

A repulsive force between like charges within the nucleus.

Signup and view all the flashcards

Neutron/Proton ratio

Ratio of neutrons to protons affects nuclear stability.

Signup and view all the flashcards

Magic Numbers (Stability)

Specific numbers of nucleons leading to stable nuclei.

Signup and view all the flashcards

1𝜇=1.66 𝑥 10 𝑘𝑔

Atomic mass units

Signup and view all the flashcards

R =

The empirical formula that approximates the size of nuclei, where R is the radius, r₀ is roughly 1.2 femtometers.

Signup and view all the flashcards

β- Decay

Loss of a beta particle (high-energy electron) during nuclear decay. This increases the atomic number by one.

Signup and view all the flashcards

γ-Decay

Loss of a gamma ray (high-energy radiation) from a nucleus after a nuclear reaction. Does not change mass or atomic number.

Signup and view all the flashcards

Stability Chart

Used to visualize isotopes and their stability relative to neutron and proton counts.

Signup and view all the flashcards

Beta Minus Decay (β-)

Loss of a beta particle from the nucleus, increasing the atomic number by one.

Signup and view all the flashcards

Neutron generation

Heavy nucleus splits into lighter ones generating one or more free neutrons.

Signup and view all the flashcards

Activity

A measure of the rate at which radioactive decay occurs in a sample.

Signup and view all the flashcards

Nuclear Radius Formula

R = r₀A^(1/3), where r₀ is 1.2 fm and A is the nucleon number.

Signup and view all the flashcards

Magic Numbers in Nuclei

Specific numbers of protons or neutrons leading to particularly stable nuclei.

Signup and view all the flashcards

Even vs. Odd Nucleons (Stability)

Helps determine nuclear stability, nuclei with even numbers of both protons and neutrons tend to be more stable.

Signup and view all the flashcards

Artificial Radioactivity Examples

Technetium, astatine, and francium are made in labs, not nature.

Signup and view all the flashcards

Balancing Alpha Decay

Must be balanced. Sum of mass numbers and atomic numbers must be the same on the left and right.

Signup and view all the flashcards

Alpha Particle Composition

α particle is made up of 2 protons and 2 neutrons.

Signup and view all the flashcards

Radiation

High-energy particles or waves emitted from the nucleus of an unstable atom.

Signup and view all the flashcards

Mass Number

Number of protons plus neutrons.

Signup and view all the flashcards

Atomic Number (Z)

The number of protons in the nucleus of an atom, determining the element.

Signup and view all the flashcards

Element Instability

Elements with number above or below the band of stability.

Signup and view all the flashcards

Coulomb's Law

The law that describes electrostatic repulsion between like charges.

Signup and view all the flashcards

Nuclear Radius Equation

The radius of most nuclei. R = r₀A^(1/3) where r₀ = 1.2 fm

Signup and view all the flashcards

Nuclear fission process

A process in which a heavy nucleus splits into lighter ones generating one or more free neutrons.Because heavy nucleus is less stable than its product, this process releases a large amount of energy

Signup and view all the flashcards

Nuclear Equation Balance

The balancing of mass number and atomic number on both sides of a nuclear equation.

Signup and view all the flashcards

Calculating Neutrons

Number of neutrons in a nucleus. Calculated as Atomic Mass - Atomic Number.

Signup and view all the flashcards

Nuclear Fission (Details)

Splitting of a heavy nucleus into two lighter nuclei with release of much energy.

Signup and view all the flashcards

Nuclear Fusion (Details)

Combining two light nuclei to form a heavier nucleus.

Signup and view all the flashcards

Beta Minus Particle

The high-energy electron emitted during beta decay.

Signup and view all the flashcards

More Like This

Atomic and Nuclear Structure Quiz
24 questions
Atomic Structure and Nuclear Properties
10 questions

Atomic Structure and Nuclear Properties

UnderstandableConstellation6665 avatar
UnderstandableConstellation6665
Nuclear Physics Chapter 30
40 questions
Nuclear Physics and Radioactivity
32 questions
Use Quizgecko on...
Browser
Browser