Question 1

Assuming that 200 MeV of energy is released per fission, the mass of 235U that undergoes fission to operate a 250-MW reactor for 1 y is approximately

Accepted Answer

A)  100 kg 
B)  200 kg 
C)  400 kg 
D)  500 kg 
E)  1 Mg 
A)  100 kg 
B)  200 kg 
C)  400 kg 
D)  500 kg 
E)  1 Mg

Question 2

Two nuclides that are isotopes could lie on curve

Accepted Answer

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

Question 3

A reactor that produces more fuel than it uses is called a

Accepted Answer

A)  fission reactor. 
B)  moderator reactor. 
C)  breeder reactor. 
D)  generating reactor. 
E)  fusion reactor. 
A)  fission reactor. 
B)  moderator reactor. 
C)  breeder reactor. 
D)  generating reactor. 
E)  fusion reactor.

Question 4

Fission occurs because the average binding energy per nucleon for the fission fragments is higher than that for the original nucleus. The change in binding energy per nucleon is approximately

Accepted Answer

A)  0.50 MeV 
B)  1.0 MeV 
C)  7.0 MeV 
D)  28 MeV 
E)  0.20 keV 
A)  0.50 MeV 
B)  1.0 MeV 
C)  7.0 MeV 
D)  28 MeV 
E)  0.20 keV

Question 5

A fusion reaction that is highly probable is   The amount of fusion energy released in this reaction is approximately

Accepted Answer

A)  1.0 MeV 
B)  2.0 MeV 
C)  3.0 MeV 
D)  4.0 MeV 
E)  5.0 MeV 
A)  1.0 MeV 
B)  2.0 MeV 
C)  3.0 MeV 
D)  4.0 MeV 
E)  5.0 MeV

Question 6

In this problem, Z is the atomic number, N is the neutron number, and A is the mass number. For stable isotopes with A greater than 44, as A increases, the ratio Z/N

Accepted Answer

A)  remains the same. 
B)  decreases. 
C)  equals A - N. 
D)  increases. 
E)  None of these is correct. 
A)  remains the same. 
B)  decreases. 
C)  equals A - N. 
D)  increases. 
E)  None of these is correct.

Question 7

The following fusion reaction occurs in the Sun:   The masses of the nuclei are
3He = 3.016 049 u
4He = 4.002 604 u
7Be = 7.016 930 u
The energy released or absorbed by the reaction is

Accepted Answer

A)  920 MeV, absorbed 
B)  1.6 MeV, absorbed 
C)  920 MeV, released 
D)  1.6 MeV, released 
E)  270 MeV, released 
A)  920 MeV, absorbed 
B)  1.6 MeV, absorbed 
C)  920 MeV, released 
D)  1.6 MeV, released 
E)  270 MeV, released

Question 8

The superscript before the symbol for an element represents the number of

Accepted Answer

A)  protons. 
B)  neutrons. 
C)  protons plus neutrons. 
D)  protons minus neutrons. 
E)  neutrons minus protons. 
A)  protons. 
B)  neutrons. 
C)  protons plus neutrons. 
D)  protons minus neutrons. 
E)  neutrons minus protons.

Question 9

How much energy (in MeV) is released in the beta decay of a free neutron? Assume mass(proton) = 938.272 MeV/c2, mass(neutron) = 939.566 MeV/c2, mass(electron) = 0.511 MeV/c2, and mass(neutrino) = 0.000 MeV/c2.

Accepted Answer

A)  1.294 MeV 
B)  0.783 MeV 
C)  0.272 MeV 
D)  1.805 MeV 
E)  Energy is not released in this decay. 
A)  1.294 MeV 
B)  0.783 MeV 
C)  0.272 MeV 
D)  1.805 MeV 
E)  Energy is not released in this decay.

Question 10

The graph shows the number of radioactive nuclei N remaining as a function of time. The point on the graph that corresponds to the half-life of the decay process is

Accepted Answer

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

Question 11

The reaction,   , cannot occur spontaneously because

Accepted Answer

A)  the charge is not conserved. 
B)  the nucleon number is not conserved. 
C)  the sum of the masses of the daughter particles is greater than the mass of the parent. 
D)  the atomic number is not conserved. 
E)  None of the above statement is correct. 
A)  the charge is not conserved. 
B)  the nucleon number is not conserved. 
C)  the sum of the masses of the daughter particles is greater than the mass of the parent. 
D)  the atomic number is not conserved. 
E)  None of the above statement is correct.

Question 12

When a gamma ray passes through a material,

Accepted Answer

A)  the gamma ray can cause photoelectric effect. 
B)  the gamma ray can cause Compton scattering. 
C)  the gamma ray can cause pair production. 
D)  the gamma ray can pass right through the material unchanged. 
E)  All the above processes can take place. 
A)  the gamma ray can cause photoelectric effect. 
B)  the gamma ray can cause Compton scattering. 
C)  the gamma ray can cause pair production. 
D)  the gamma ray can pass right through the material unchanged. 
E)  All the above processes can take place.

Question 13

The alpha particles from a naturally radioactive decay have a kinetic energy of
4)25 MeV. How close does an alpha particle come within a gold nucleus if the particle is heading directly towards the nucleus? Give your answer in terms of number of radii of the gold atom, r = 7.0 fm.

Accepted Answer

A)  2 
B)  8 
C)  12 
D)  15 
E)  19 
A)  2 
B)  8 
C)  12 
D)  15 
E)  19

Question 14

A sample of   (which decays by$\beta$-emission) has an activity of 14.7 mCi. After
26)1 d it has an activity of 4.25 mCi. The half-life of 32P is approximately

Accepted Answer

A)  3.03 d 
B)  7.30 d 
C)  12.1 d 
D)  14.6 d 
E)  24.2 d 
A)  3.03 d 
B)  7.30 d 
C)  12.1 d 
D)  14.6 d 
E)  24.2 d

Question 15

A 2000-year-old piece of dead wood gives 1400 counts per week in our detector system. How many counts per week would our system detect if the wood were living? (The half-life of 14C is 5730 years.)

Accepted Answer

A)  1520 counts per week 
B)  3200 counts per week 
C)  1270 counts per week 
D)  1780 counts per week 
E)  2130 counts per week 
A)  1520 counts per week 
B)  3200 counts per week 
C)  1270 counts per week 
D)  1780 counts per week 
E)  2130 counts per week

Question 16

The main purpose of a moderator in a nuclear reactor is to

Accepted Answer

A)  absorb the neutrons and thereby decrease the reaction rate. 
B)  absorb the neutrons and thereby increase the reaction rate. 
C)  slow the neutrons and thereby decrease the reaction rate. 
D)  slow the neutrons and thereby increase the reaction rate. 
E)  cool the reactor chamber. 
A)  absorb the neutrons and thereby decrease the reaction rate. 
B)  absorb the neutrons and thereby increase the reaction rate. 
C)  slow the neutrons and thereby decrease the reaction rate. 
D)  slow the neutrons and thereby increase the reaction rate. 
E)  cool the reactor chamber.

Question 17

Oxygen-15 is a $\beta$+ emitter that is often used in PET scans. It has a half-life of 122 seconds. Calculate how long it takes for the patient's initial activity to be reduced by a factor of 100.

Accepted Answer

A)  203 mins 
B)  1.22 *104 mins 
C)  13.5 mins 
D)  8.13 mins 
E)  None of these is correct. 
A)  203 mins 
B)  1.22 *104 mins 
C)  13.5 mins 
D)  8.13 mins 
E)  None of these is correct.

Question 18

The Q of the reaction   is approximately

Accepted Answer

A)  0 
B)  7.56 MeV 
C)  -7.56 MeV 
D)  3.00 MeV 
E)  -3.00 MeV 
A)  0 
B)  7.56 MeV 
C)  -7.56 MeV 
D)  3.00 MeV 
E)  -3.00 MeV

Question 19

Cesium-137 has a half-life of 31.0 y. The time required for the cesium-137 now present to decrease to 1/30 its present value is

Accepted Answer

A)  930 y 
B)  30 y 
C)  465 y 
D)  152 y 
E)  1.6 y 
A)  930 y 
B)  30 y 
C)  465 y 
D)  152 y 
E)  1.6 y

Question 20

Which of these nuclear reactions is possible?

Accepted Answer

A)    
B)    
C)    
D)    
E)  None of these is possible. 
A)    
B)    
C)    
D)    
E)  None of these is possible.

Assuming that 200 MeV of energy is released per fission, the mass of ²³⁵U that undergoes fission to operate a 250-MW reactor for 1 y is approximately

Two nuclides that are isotopes could lie on curve

A reactor that produces more fuel than it uses is called a

Fission occurs because the average binding energy per nucleon for the fission fragments is higher than that for the original nucleus. The change in binding energy per nucleon is approximately

A fusion reaction that is highly probable is The amount of fusion energy released in this reaction is approximately

In this problem, Z is the atomic number, N is the neutron number, and A is the mass number. For stable isotopes with A greater than 44, as A increases, the ratio Z/N

The following fusion reaction occurs in the Sun: The masses of the nuclei are ³He = 3.016 049 u ⁴He = 4.002 604 u ⁷Be = 7.016 930 u The energy released or absorbed by the reaction is

The superscript before the symbol for an element represents the number of

How much energy (in MeV) is released in the beta decay of a free neutron? Assume mass(proton) = 938.272 MeV/c², mass(neutron) = 939.566 MeV/c², mass(electron) = 0.511 MeV/c², and mass(neutrino) = 0.000 MeV/c².

The graph shows the number of radioactive nuclei N remaining as a function of time. The point on the graph that corresponds to the half-life of the decay process is

The reaction, , cannot occur spontaneously because

When a gamma ray passes through a material,

The alpha particles from a naturally radioactive decay have a kinetic energy of 4)25 MeV. How close does an alpha particle come within a gold nucleus if the particle is heading directly towards the nucleus? Give your answer in terms of number of radii of the gold atom, r = 7.0 fm.

A 2000-year-old piece of dead wood gives 1400 counts per week in our detector system. How many counts per week would our system detect if the wood were living? (The half-life of ¹⁴C is 5730 years.)

The main purpose of a moderator in a nuclear reactor is to

Oxygen-15 is a $\beta$ + emitter that is often used in PET scans. It has a half-life of 122 seconds. Calculate how long it takes for the patient's initial activity to be reduced by a factor of 100.

The Q of the reaction is approximately

Cesium-137 has a half-life of 31.0 y. The time required for the cesium-137 now present to decrease to 1/30 its present value is

Which of these nuclear reactions is possible?

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

Assuming that 200 MeV of energy is released per fission, the mass of 235U that undergoes fission to operate a 250-MW reactor for 1 y is approximately

Two nuclides that are isotopes could lie on curve

A reactor that produces more fuel than it uses is called a

Fission occurs because the average binding energy per nucleon for the fission fragments is higher than that for the original nucleus. The change in binding energy per nucleon is approximately

A fusion reaction that is highly probable is The amount of fusion energy released in this reaction is approximately

In this problem, Z is the atomic number, N is the neutron number, and A is the mass number. For stable isotopes with A greater than 44, as A increases, the ratio Z/N

The following fusion reaction occurs in the Sun: The masses of the nuclei are 3He = 3.016 049 u 4He = 4.002 604 u 7Be = 7.016 930 u The energy released or absorbed by the reaction is

The superscript before the symbol for an element represents the number of

How much energy (in MeV) is released in the beta decay of a free neutron? Assume mass(proton) = 938.272 MeV/c2, mass(neutron) = 939.566 MeV/c2, mass(electron) = 0.511 MeV/c2, and mass(neutrino) = 0.000 MeV/c2.

The graph shows the number of radioactive nuclei N remaining as a function of time. The point on the graph that corresponds to the half-life of the decay process is

The reaction, , cannot occur spontaneously because

When a gamma ray passes through a material,

The alpha particles from a naturally radioactive decay have a kinetic energy of 4)25 MeV. How close does an alpha particle come within a gold nucleus if the particle is heading directly towards the nucleus? Give your answer in terms of number of radii of the gold atom, r = 7.0 fm.

A sample of (which decays by β\betaβ -emission) has an activity of 14.7 mCi. After 26)1 d it has an activity of 4.25 mCi. The half-life of 32P is approximately

A 2000-year-old piece of dead wood gives 1400 counts per week in our detector system. How many counts per week would our system detect if the wood were living? (The half-life of 14C is 5730 years.)

The main purpose of a moderator in a nuclear reactor is to

Oxygen-15 is a β\betaβ + emitter that is often used in PET scans. It has a half-life of 122 seconds. Calculate how long it takes for the patient's initial activity to be reduced by a factor of 100.

The Q of the reaction is approximately

Cesium-137 has a half-life of 31.0 y. The time required for the cesium-137 now present to decrease to 1/30 its present value is

Which of these nuclear reactions is possible?

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

Assuming that 200 MeV of energy is released per fission, the mass of ²³⁵U that undergoes fission to operate a 250-MW reactor for 1 y is approximately

The following fusion reaction occurs in the Sun: The masses of the nuclei are ³He = 3.016 049 u ⁴He = 4.002 604 u ⁷Be = 7.016 930 u The energy released or absorbed by the reaction is

How much energy (in MeV) is released in the beta decay of a free neutron? Assume mass(proton) = 938.272 MeV/c², mass(neutron) = 939.566 MeV/c², mass(electron) = 0.511 MeV/c², and mass(neutrino) = 0.000 MeV/c².

A 2000-year-old piece of dead wood gives 1400 counts per week in our detector system. How many counts per week would our system detect if the wood were living? (The half-life of ¹⁴C is 5730 years.)

Oxygen-15 is a $\beta$ + emitter that is often used in PET scans. It has a half-life of 122 seconds. Calculate how long it takes for the patient's initial activity to be reduced by a factor of 100.