Question 1

The Q of the reaction   is approximately

Accepted Answer

A)  0 
B)  7.56 MeV 
C)  8.02 MeV 
D)  13.4 MeV 
E)  1.06 MeV 
A)  0 
B)  7.56 MeV 
C)  8.02 MeV 
D)  13.4 MeV 
E)  1.06 MeV

Question 2

For most nuclei, the total binding energy is proportional to the number of nucleons. This leads to the conclusion that nuclear forces show the property of

Accepted Answer

A)  pairing 
B)  charge dependence 
C)  relativity 
D)  magnetism 
E)  None of these is correct. 
A)  pairing 
B)  charge dependence 
C)  relativity 
D)  magnetism 
E)  None of these is correct.

Question 3

A certain radioactive element has a half-life of 20 d. The time it will take for 7/8 of the atoms originally present to disintegrate is

Accepted Answer

A)  20 d 
B)  40 d 
C)  60 d 
D)  80 d 
E)  100 d 
A)  20 d 
B)  40 d 
C)  60 d 
D)  80 d 
E)  100 d

Question 4

A particle is incident on a nucleus. The particle

Accepted Answer

A)  can be scattered elastically by the nucleus. 
B)  can be scattered inelastically by the nucleus with the nucleus in an excited state. 
C)  can be absorbed by the nucleus completely. 
D)  can be absorbed by the nucleus and other particle(s) emitted. 
E)  All of the above are possible. 
A)  can be scattered elastically by the nucleus. 
B)  can be scattered inelastically by the nucleus with the nucleus in an excited state. 
C)  can be absorbed by the nucleus completely. 
D)  can be absorbed by the nucleus and other particle(s) emitted. 
E)  All of the above are possible.

Question 5

The unifying concepts in physics are the conservation laws. To preserve these laws in nuclear processes, it became necessary to postulate the existence of

Accepted Answer

A)  the positron. 
B)  particle spin. 
C)  space quantization. 
D)  the neutrino. 
E)  the neutron. 
A)  the positron. 
B)  particle spin. 
C)  space quantization. 
D)  the neutrino. 
E)  the neutron.

Question 6

Initially a mixture of two radioactive sources contains the same number of nuclei of source A and source B. The half-life of A is 2 hours, and the half-life of B is 3 hours. What will be the ratio of remaining nuclei of A divided by remaining nuclei B after 12 hours? (Assume A does not decay into B or vice-versa.)

Accepted Answer

A)  0.250 
B)  0.125 
C)  0.5 
D)  0.0625 
E)  None of these is correct. 
A)  0.250 
B)  0.125 
C)  0.5 
D)  0.0625 
E)  None of these is correct.

Question 7

The word isotopes describes elements that have

Accepted Answer

A)  the same atomic number but different atomic mass. 
B)  the same atomic mass but different atomic number. 
C)  the same atomic mass and the same atomic number but different chemical properties. 
D)  similar chemical properties, though they differ in both atomic mass and atomic number. 
E)  the same number of valence electrons. 
A)  the same atomic number but different atomic mass. 
B)  the same atomic mass but different atomic number. 
C)  the same atomic mass and the same atomic number but different chemical properties. 
D)  similar chemical properties, though they differ in both atomic mass and atomic number. 
E)  the same number of valence electrons.

Question 8

The total binding energy per nucleon of   is approximately

Accepted Answer

A)  0.04215 MeV 
B)  0.00602 MeV 
C)  5.606 MeV 
D)  6.593 MeV 
E)  0.00590 MeV 
A)  0.04215 MeV 
B)  0.00602 MeV 
C)  5.606 MeV 
D)  6.593 MeV 
E)  0.00590 MeV

Question 9

The graph shows the number of undecayed atoms as a function of time. The half-life of this radioactive element is approximately

Accepted Answer

A)  1 s 
B)  2 s 
C)  10 s 
D)  4 s 
E)  5 s 
A)  1 s 
B)  2 s 
C)  10 s 
D)  4 s 
E)  5 s

Question 10

The speed of alpha particles from 210Po is 1.6 * 107 m/s. The recoil atom will have a speed of approximately

Accepted Answer

A)  zero 
B)  76 km/s 
C)  3.1*105 m/s 
D)  1.6 * 107 m/s 
E)  6.4* 107 m/s 
A)  zero 
B)  76 km/s 
C)  3.1*105 m/s 
D)  1.6 * 107 m/s 
E)  6.4* 107 m/s

Question 11

The chemical characteristics of an atom (what element it is) are determined by

Accepted Answer

A)  its atomic number. 
B)  its mass number. 
C)  its neutron number. 
D)  its nucleon number. 
E)  All of these are correct. 
A)  its atomic number. 
B)  its mass number. 
C)  its neutron number. 
D)  its nucleon number. 
E)  All of these are correct.

Question 12

The half-life of phosphorus-32 is 14.3 d. If you have 1.00 g of phosphorous-32 today, the amount remaining in 10 d will be approximately

Accepted Answer

A)  700 mg 
B)  650 mg 
C)  616 mg 
D)  384 mg 
E)  350 mg 
A)  700 mg 
B)  650 mg 
C)  616 mg 
D)  384 mg 
E)  350 mg

Question 13

In gamma-decay a nucleus in an excited state decays to a lower energy state by the emission of a high energy photon called a gamma-ray.

Accepted Answer

A)  Gamma-decay is always slow (greater than a ns). 
B)  Gamma-decay is always fast (less than a ns). 
C)  Gamma-decay is usually fast but can in special cases be slow. 
D)  Gamma-decay is always accompanied by the emission of a neutrino. 
E)  Gamma-decay is always accompanied by the emission of a $\beta$-particle. 
A)  Gamma-decay is always slow (greater than a ns). 
B)  Gamma-decay is always fast (less than a ns). 
C)  Gamma-decay is usually fast but can in special cases be slow. 
D)  Gamma-decay is always accompanied by the emission of a neutrino. 
E)  Gamma-decay is always accompanied by the emission of a $\beta$-particle.

Question 14

The graph shows the activity as a function of time for a radioactive sample. The decay constant for this sample is approximately

Accepted Answer

A)  0.11 d-1  
B)  0.69 d-1  
C)  0.090 d-1  
D)  6.0 d-1  
E)  1.8 d-1  
A)  0.11 d-1  
B)  0.69 d-1  
C)  0.090 d-1  
D)  6.0 d-1  
E)  1.8 d-1

Question 15

Nuclear fusion takes place when

Accepted Answer

A)  a large nucleus splits into two fragments with the release of a few neutrons. 
B)  an $\alpha$ particle is ejected from the nucleus. 
C)  a positive $\beta$particle is ejected from the nucleus. 
D)  small nuclei combine to form a larger one. 
E)  heavy hydrogen is accelerated. 
A)  a large nucleus splits into two fragments with the release of a few neutrons. 
B)  an $\alpha$ particle is ejected from the nucleus. 
C)  a positive $\beta$particle is ejected from the nucleus. 
D)  small nuclei combine to form a larger one. 
E)  heavy hydrogen is accelerated.

Question 16

How many times larger is the radius of the nucleus 208Pb (Z=82) compared to the nucleus 40Ca (Z=20)?

Accepted Answer

A)  0.58 
B)  1.7 
C)  5.2 
D)  4.1 
E)  2.3 
A)  0.58 
B)  1.7 
C)  5.2 
D)  4.1 
E)  2.3

Question 17

A light-water reactor uses _______ as fuel, and a heavy-water reactor uses _______ as fuel.

Accepted Answer

A)  natural uranium; natural uranium 
B)  enriched uranium; natural uranium 
C)  enriched uranium; enriched uranium 
D)  natural uranium; enriched uranium 
E)  enriched uranium; plutonium 
A)  natural uranium; natural uranium 
B)  enriched uranium; natural uranium 
C)  enriched uranium; enriched uranium 
D)  natural uranium; enriched uranium 
E)  enriched uranium; plutonium

Question 18

The cross section of a nuclear reaction is

Accepted Answer

A)  directly proportional to both the flux and the energy of the incident particle. 
B)  independent of the incident particle but highly dependent on the target nuclei. 
C)  dependent on the particular reaction being considered and the energy of the incident particle. 
D)  influenced by the Coulomb force but is independent of the type of target nuclei and reaction. 
E)  applicable only to neutron-induced reactions. 
A)  directly proportional to both the flux and the energy of the incident particle. 
B)  independent of the incident particle but highly dependent on the target nuclei. 
C)  dependent on the particular reaction being considered and the energy of the incident particle. 
D)  influenced by the Coulomb force but is independent of the type of target nuclei and reaction. 
E)  applicable only to neutron-induced reactions.

Question 19

The graph shows the decay curves of four radioactive elements. The half-life is the same for elements

Accepted Answer

A)  1 and 2 
B)  3 and 4 
C)  1 and 4 
D)  2 and 3 
E)  1 and 3 
A)  1 and 2 
B)  3 and 4 
C)  1 and 4 
D)  2 and 3 
E)  1 and 3

Question 20

The graph shows the number of nuclei N remaining as a function of time. The point on the graph that corresponds to the number of nuclei remaining after two half-lives have elapsed is

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

The Q of the reaction is approximately

For most nuclei, the total binding energy is proportional to the number of nucleons. This leads to the conclusion that nuclear forces show the property of

A certain radioactive element has a half-life of 20 d. The time it will take for 7/8 of the atoms originally present to disintegrate is

A particle is incident on a nucleus. The particle

The unifying concepts in physics are the conservation laws. To preserve these laws in nuclear processes, it became necessary to postulate the existence of

The word isotopes describes elements that have

The total binding energy per nucleon of is approximately

The graph shows the number of undecayed atoms as a function of time. The half-life of this radioactive element is approximately

The speed of alpha particles from ²¹⁰Po is 1.6 * 10⁷ m/s. The recoil atom will have a speed of approximately

The chemical characteristics of an atom (what element it is) are determined by

The half-life of phosphorus-32 is 14.3 d. If you have 1.00 g of phosphorous-32 today, the amount remaining in 10 d will be approximately

In gamma-decay a nucleus in an excited state decays to a lower energy state by the emission of a high energy photon called a gamma-ray.

The graph shows the activity as a function of time for a radioactive sample. The decay constant for this sample is approximately

Nuclear fusion takes place when

How many times larger is the radius of the nucleus ²⁰⁸Pb (Z=82) compared to the nucleus ⁴⁰Ca (Z=20)?

A light-water reactor uses _ as fuel, and a heavy-water reactor uses _ as fuel.

The cross section of a nuclear reaction is

The graph shows the decay curves of four radioactive elements. The half-life is the same for elements

The graph shows the number of nuclei N remaining as a function of time. The point on the graph that corresponds to the number of nuclei remaining after two half-lives have elapsed is

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Elementary Particles and the Beginning of the Universe

Filters

Exam 20: Nuclear Physics

The Q of the reaction is approximately

For most nuclei, the total binding energy is proportional to the number of nucleons. This leads to the conclusion that nuclear forces show the property of

A certain radioactive element has a half-life of 20 d. The time it will take for 7/8 of the atoms originally present to disintegrate is

A particle is incident on a nucleus. The particle

The unifying concepts in physics are the conservation laws. To preserve these laws in nuclear processes, it became necessary to postulate the existence of

The word isotopes describes elements that have

The total binding energy per nucleon of is approximately

The graph shows the number of undecayed atoms as a function of time. The half-life of this radioactive element is approximately

The speed of alpha particles from 210Po is 1.6 * 107 m/s. The recoil atom will have a speed of approximately

The chemical characteristics of an atom (what element it is) are determined by

The half-life of phosphorus-32 is 14.3 d. If you have 1.00 g of phosphorous-32 today, the amount remaining in 10 d will be approximately

In gamma-decay a nucleus in an excited state decays to a lower energy state by the emission of a high energy photon called a gamma-ray.

The graph shows the activity as a function of time for a radioactive sample. The decay constant for this sample is approximately

Nuclear fusion takes place when

How many times larger is the radius of the nucleus 208Pb (Z=82) compared to the nucleus 40Ca (Z=20)?

A light-water reactor uses _______ as fuel, and a heavy-water reactor uses _______ as fuel.

The cross section of a nuclear reaction is

The graph shows the decay curves of four radioactive elements. The half-life is the same for elements

The graph shows the number of nuclei N remaining as a function of time. The point on the graph that corresponds to the number of nuclei remaining after two half-lives have elapsed is

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Elementary Particles and the Beginning of the Universe

Filters

The speed of alpha particles from ²¹⁰Po is 1.6 * 10⁷ m/s. The recoil atom will have a speed of approximately

How many times larger is the radius of the nucleus ²⁰⁸Pb (Z=82) compared to the nucleus ⁴⁰Ca (Z=20)?

A light-water reactor uses _ as fuel, and a heavy-water reactor uses _ as fuel.