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Questions and Answers
What is the critical condition for an atomic bomb to work?
What is the critical condition for an atomic bomb to work?
- The size of the fissile material should not be less than the critical size (correct)
- The size of the fissile material should be exactly equal to the critical size
- The size of the fissile material should be less than the critical size
- The size of the fissile material should be more than the critical size
What happens when the amount of U 235 exceeds a few kilograms?
What happens when the amount of U 235 exceeds a few kilograms?
- Neutrons emitted during fission escape
- Neutrons emitted during fission are absorbed by adjacent nuclei causing further fission (correct)
- Neutrons emitted during fission cancel each other out
- Neutrons emitted during fission react with other elements
What is the result of a nuclear chain reaction caused by U 235 fission?
What is the result of a nuclear chain reaction caused by U 235 fission?
- No energy is released
- A vast quantity of energy is released (correct)
- The energy released is unpredictable
- A small amount of energy is released
What is the difference between nuclear fission and spallation reactions?
What is the difference between nuclear fission and spallation reactions?
What is the most common element capable of undergoing nuclear fission?
What is the most common element capable of undergoing nuclear fission?
What is the name of the process by which U 235 undergoes fission?
What is the name of the process by which U 235 undergoes fission?
What is the term used to describe the phenomenon of certain elements undergoing spontaneous disintegration without external influence?
What is the term used to describe the phenomenon of certain elements undergoing spontaneous disintegration without external influence?
Who is credited with the discovery of radioactivity in 1891?
Who is credited with the discovery of radioactivity in 1891?
What is the term used to describe the study of the composition of atomic nuclei and nuclear transformations?
What is the term used to describe the study of the composition of atomic nuclei and nuclear transformations?
What is the term used to describe the process in which a non-radioactive substance becomes radioactive after exposure to radiation?
What is the term used to describe the process in which a non-radioactive substance becomes radioactive after exposure to radiation?
What is the purpose of devices such as ionisation chamber, Geiger Muller counter, and scintillation counter?
What is the purpose of devices such as ionisation chamber, Geiger Muller counter, and scintillation counter?
What is the term used to describe nuclear reactions that involve the combination of atomic nuclei to form a heavier nucleus?
What is the term used to describe nuclear reactions that involve the combination of atomic nuclei to form a heavier nucleus?
What is the type of nuclear reaction that occurs when a heavier atom like uranium-235 is split into smaller fragments?
What is the type of nuclear reaction that occurs when a heavier atom like uranium-235 is split into smaller fragments?
Which of the following isotopes of uranium undergoes fission by slow moving neutrons?
Which of the following isotopes of uranium undergoes fission by slow moving neutrons?
What is the purpose of a nuclear reactor?
What is the purpose of a nuclear reactor?
Which of the following elements is used in a nuclear reactor to slow down neutrons?
Which of the following elements is used in a nuclear reactor to slow down neutrons?
What was the composition of the atomic bomb used in Hiroshima?
What was the composition of the atomic bomb used in Hiroshima?
Who discovered that uranium-235 splits up into two relatively lighter elements when bombarded with neutrons?
Who discovered that uranium-235 splits up into two relatively lighter elements when bombarded with neutrons?
What happens when the neutron-to-proton ratio in a nucleus is higher than required for stability?
What happens when the neutron-to-proton ratio in a nucleus is higher than required for stability?
What is the relationship between the rate of radioactive decay and the amount of the radioactive element present?
What is the relationship between the rate of radioactive decay and the amount of the radioactive element present?
What is the significance of the decay constant λ in the equation for radioactive decay?
What is the significance of the decay constant λ in the equation for radioactive decay?
What is the effect of a lower neutron-to-proton ratio in a nucleus than required for stability?
What is the effect of a lower neutron-to-proton ratio in a nucleus than required for stability?
What is the order of the reaction in radioactive decay?
What is the order of the reaction in radioactive decay?
What is the energy of activation for radioactive decay?
What is the energy of activation for radioactive decay?
What is the primary reason why Radium is about 3 million times more radioactive than uranium?
What is the primary reason why Radium is about 3 million times more radioactive than uranium?
What is the characteristic of α-rays emitted by a radioactive substance?
What is the characteristic of α-rays emitted by a radioactive substance?
What is the result of a radioactive substance emitting radiations by itself?
What is the result of a radioactive substance emitting radiations by itself?
What is the difference between β-rays and γ-rays emitted by a radioactive substance?
What is the difference between β-rays and γ-rays emitted by a radioactive substance?
Why do certain elements undergo spontaneous disintegration without external influence?
Why do certain elements undergo spontaneous disintegration without external influence?
What is the primary reason why Rutherford was able to split the radiations emitted by a radioactive substance into α, β, and γ-rays?
What is the primary reason why Rutherford was able to split the radiations emitted by a radioactive substance into α, β, and γ-rays?
What is the result of a decrease in the neutron-proton ratio in a radioactive nucleus?
What is the result of a decrease in the neutron-proton ratio in a radioactive nucleus?
What is the consequence of a radioactive nucleus emitting an alpha-particle?
What is the consequence of a radioactive nucleus emitting an alpha-particle?
What is the relationship between the packing fraction and the stability of a nucleus?
What is the relationship between the packing fraction and the stability of a nucleus?
What is the role of the neutron-proton ratio in determining the stability of a nucleus?
What is the role of the neutron-proton ratio in determining the stability of a nucleus?
What is the consequence of a radioactive nucleus emitting a beta-particle?
What is the consequence of a radioactive nucleus emitting a beta-particle?
What is the relationship between the binding energy and the stability of a nucleus?
What is the relationship between the binding energy and the stability of a nucleus?
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