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Questions and Answers

What is the total number of neutrons in one atom of carbon with a mass number of 13?

  • 5
  • 7 (correct)
  • 8
  • 6
  • How many neutrons are present in an atom with a mass number of 56 and an atomic number of 26?

  • 24
  • 30 (correct)
  • 36
  • 26
  • What is the complete symbol for the atom with an atomic number of 92 and a mass number of 233?

  • He-92
  • U-235
  • Cl-233
  • U-233 (correct)
  • If yellow light emitted from a sodium lamp has a wavelength of 580 nm, what is its frequency?

    <p>5.17 x 10^14 s^-1</p> Signup and view all the answers

    Which of the following formulas is used to calculate the number of neutrons in an atom?

    <p>Mass number - Atomic number = Neutrons</p> Signup and view all the answers

    What is the wavelength of light in meters corresponding to 580 nm?

    <p>580 x 10^-9 m</p> Signup and view all the answers

    What is the atomic number of the element beryllium?

    <p>4</p> Signup and view all the answers

    What is the energy of a photon with a frequency of 3 x 10^15 Hz?

    <p>1.24 x 10^-18 J</p> Signup and view all the answers

    How many protons are present in a neutral atom of copper?

    <p>29</p> Signup and view all the answers

    What is the electronic configuration of the element with atomic number 29?

    <p>1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 3d 10</p> Signup and view all the answers

    Which of the following orbitals cannot exist?

    <p>1p</p> Signup and view all the answers

    Determine the number of electrons in the O2+ ion.

    <p>15</p> Signup and view all the answers

    What is the possible value of l for an orbital with n = 3?

    <p>0</p> Signup and view all the answers

    Identify the correct set of quantum numbers for a 3d electron.

    <p>n = 3, l = 2, m = -1</p> Signup and view all the answers

    Which of the following quantum numbers set is impossible?

    <p>n = 0, l = 0</p> Signup and view all the answers

    What is the orbital designation for an electron with quantum numbers n = 4, l = 2?

    <p>4d</p> Signup and view all the answers

    What is the correct equation to express the number of neutrons present in an ion if the variable x represents the number of electrons?

    <p>1.111x</p> Signup and view all the answers

    If an ion has a mass number of 56 and contains 3 positive charges, how is the number of electrons in the neutral atom determined?

    <p>x + 3</p> Signup and view all the answers

    Given the mass number is 56, how is the number of protons calculated from the variable x representing electrons?

    <p>x + 3</p> Signup and view all the answers

    What is the order of radiation frequencies from lowest to highest based on the provided types?

    <p>radiation from FM radio &lt; amber light &lt; radiation from microwave oven &lt; X-rays &lt; cosmic rays</p> Signup and view all the answers

    In which scenario would the wavelength be calculated as increasing for different types of radiation?

    <p>cosmic rays &lt; X-rays &lt; radiation from microwave oven &lt; amber light &lt; radiation from FM radio</p> Signup and view all the answers

    What is the mass number of an ion that has 30.4% more neutrons than electrons and contains 3 units of positive charge?

    <p>56</p> Signup and view all the answers

    When calculating the power of a laser, which equation incorporates Planck's constant, velocity of radiation, and wavelength?

    <p>E = N * h * c / λ</p> Signup and view all the answers

    What is the calculated power of a nitrogen laser that emits 5.6 x 10^24 photons at a wavelength of 337.1 nm?

    <p>3.3 x 10^6 J</p> Signup and view all the answers

    What is the work function for silver metal when the applied voltage is 0.35 V and the energy of the photon is 4.83 eV?

    <p>4.48 eV</p> Signup and view all the answers

    If a photon with a wavelength of 150 pm strikes an atom and ejects an electron with a kinetic energy of 1.5 x 10^7 ms^-1, how much energy binds the electron to the nucleus?

    <p>7.6 x 10^16 J</p> Signup and view all the answers

    In the Paschen series, which orbit does the transition start from if it ends at orbit n = 3?

    <p>n = 5</p> Signup and view all the answers

    What is the frequency of the transition in the Paschen series represented by v = 3.29 x 10^15 (Hz) [1/32 – 1/n^2] for n = 5?

    <p>3.29 x 10^15 Hz</p> Signup and view all the answers

    Which region of the electromagnetic spectrum does the radiation corresponding to a wavelength of 1285 nm lie in?

    <p>Infrared region</p> Signup and view all the answers

    If the radius of the initial orbit is 1.3225 nm and ends at 211.6 pm, which series does this transition belong to?

    <p>Paschen series</p> Signup and view all the answers

    What is the total energy of the photon incident with a wavelength of 256.7 nm?

    <p>4.83 eV</p> Signup and view all the answers

    What is the kinetic energy of a photoelectron if the applied voltage is 0.35 V?

    <p>0.35 eV</p> Signup and view all the answers

    What is the frequency of the longest wavelength doublet absorption transition observed at 589 nm?

    <p>$5.093 \times 10^{14} s^{-1}$</p> Signup and view all the answers

    What is the threshold wavelength for the caesium atom with a work function of 1.9 eV?

    <p>653 nm</p> Signup and view all the answers

    What is the kinetic energy of the ejected photoelectron when caesium is irradiated with a wavelength of 500 nm?

    <p>$9.3149 \times 10^{-20} J$</p> Signup and view all the answers

    What is the threshold frequency ($\nu_0$) for caesium with a work function of 1.9 eV?

    <p>$4.593 \times 10^{14} s^{-1}$</p> Signup and view all the answers

    What is the Planck's constant derived from the experimentation with sodium metal?

    <p>$6.66 \times 10^{-34} J s$</p> Signup and view all the answers

    What is the calculated velocity of the ejected photoelectron from caesium when irradiated with a 500 nm wavelength?

    <p>$4.52 \times 10^{5} m/s$</p> Signup and view all the answers

    If the wavelength used is 500 nm for the photoelectric effect, what is the photon energy?

    <p>$3.98 \times 10^{-19} J$</p> Signup and view all the answers

    During the sodium metal irradiation, what is the measured velocity at 450 nm?

    <p>$4.35 \times 10^{-5} m/s$</p> Signup and view all the answers

    Which orbital experiences a greater effective nuclear charge between 2s and 3s?

    <p>2s</p> Signup and view all the answers

    Which pair of orbitals will experience the larger effective nuclear charge?

    <p>4d and 4f</p> Signup and view all the answers

    Among silicon and aluminum, which element's 3p electrons experience a more effective nuclear charge?

    <p>Silicon</p> Signup and view all the answers

    How many unpaired electrons are present in phosphorus (P)?

    <p>3</p> Signup and view all the answers

    What is the electronic configuration of silicon (Si)?

    <p>1s2 2s2 2p6 3s2 3p2</p> Signup and view all the answers

    Which element has the following unpaired electrons: 2?

    <p>Silicon (Si)</p> Signup and view all the answers

    What is meant by effective nuclear charge?

    <p>The net positive charge acting on an electron in an orbital</p> Signup and view all the answers

    Which of the following orbitals is farther from the nucleus?

    <p>4f</p> Signup and view all the answers

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