Question 1

Compared to fusion in a tokamak, laser fusion makes use of:

Accepted Answer

A) smaller particle number densities 
B) greater particle number densities 
C) longer confinement times 
D) higher temperatures 
E) lower temperatures 
A) smaller particle number densities 
B) greater particle number densities 
C) longer confinement times 
D) higher temperatures 
E) lower temperatures

Question 2

Nuclear fusion in the Sun is increasing its supply of:

Accepted Answer

A) hydrogen 
B) helium 
C) nucleons 
D) positrons 
E) neutrons 
A) hydrogen 
B) helium 
C) nucleons 
D) positrons 
E) neutrons

Question 3

Most laser fusion projects attempt:

Accepted Answer

A) proton-proton fusion 
B) proton-deuteron fusion 
C) deuteron-deuteron fusion 
D) deuteron-triton fusion 
E) triton-triton fusion 
A) proton-proton fusion 
B) proton-deuteron fusion 
C) deuteron-deuteron fusion 
D) deuteron-triton fusion 
E) triton-triton fusion

Question 4

If a control rod is pulled rapidly out of a nuclear reactor core, what controls the response time (how fast the power level increases)?

Accepted Answer

A) the speed at which the rod can be removed 
B) the speed at which neutrons are captured 
C) the rate at which delayed neutrons from beta decay of fission fragments are emitted 
D) the rate at which the coolant circulates in the core 
E) the time between when a neutron is captured and when the nucleus actually fissions 
A) the speed at which the rod can be removed 
B) the speed at which neutrons are captured 
C) the rate at which delayed neutrons from beta decay of fission fragments are emitted 
D) the rate at which the coolant circulates in the core 
E) the time between when a neutron is captured and when the nucleus actually fissions

Question 5

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

Accepted Answer

A) provide neutrons for the fission process 
B) slow down fast neutrons to increase the probability of capture by uranium 
C) absorb dangerous gamma radiation 
D) shield the reactor operator from dangerous radiation 
E) none of the above 
A) provide neutrons for the fission process 
B) slow down fast neutrons to increase the probability of capture by uranium 
C) absorb dangerous gamma radiation 
D) shield the reactor operator from dangerous radiation 
E) none of the above

Question 6

Which one of the following represents a fusion reaction that would yield large amounts of energy?

Accepted Answer

A) "238U92 + 1n0  $\rightarrow$ 90Kr36 + 146Cs55 + 2H1 + 1n0" 
B) "239Pu92 + 1n0 $\rightarrow$ 96Sr38 + 141Ba56 + 31n0" 
C) "238U92  $\rightarrow$ 234Th90 + 4He2" 
D) "3H1 + 2H1 $\rightarrow$ 4He2 + 1n0" 
E) "107Ag47 + 1n0  $\rightarrow$ 108Ag47  $\rightarrow$ 108Cd48 + 0e-1" 
A) "238U92 + 1n0  $\rightarrow$ 90Kr36 + 146Cs55 + 2H1 + 1n0" 
B) "239Pu92 + 1n0 $\rightarrow$ 96Sr38 + 141Ba56 + 31n0" 
C) "238U92  $\rightarrow$ 234Th90 + 4He2" 
D) "3H1 + 2H1 $\rightarrow$ 4He2 + 1n0" 
E) "107Ag47 + 1n0  $\rightarrow$ 108Ag47  $\rightarrow$ 108Cd48 + 0e-1"

Question 7

The barrier to fission comes about because the fragments:

Accepted Answer

A) attract each other via the strong nuclear force 
B) repel each other electrically 
C) produce magnetic fields 
D) have large masses 
E) attract electrons electrically 
A) attract each other via the strong nuclear force 
B) repel each other electrically 
C) produce magnetic fields 
D) have large masses 
E) attract electrons electrically

Question 8

Consider the following energies:   Rank them in order of increasing value.

Accepted Answer

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

Question 9

Fission fragments usually decay by emitting:

Accepted Answer

A) alpha particles 
B) electrons and neutrinos 
C) positrons and neutrinos 
D) only neutrons 
E) only electrons 
A) alpha particles 
B) electrons and neutrinos 
C) positrons and neutrinos 
D) only neutrons 
E) only electrons

Question 10

In a nuclear power plant, the power discharged to the environment:

Accepted Answer

A) can be made zero by proper design 
B) must be less than the electrical power generated 
C) must be greater than the electrical power generated 
D) can be entirely recycled to produce an equal amount of electrical power 
E) is none of the above 
A) can be made zero by proper design 
B) must be less than the electrical power generated 
C) must be greater than the electrical power generated 
D) can be entirely recycled to produce an equal amount of electrical power 
E) is none of the above

Exam 42: Energy From the Nucleus

Compared to fusion in a tokamak, laser fusion makes use of:

Nuclear fusion in the Sun is increasing its supply of:

Most laser fusion projects attempt:

If a control rod is pulled rapidly out of a nuclear reactor core, what controls the response time (how fast the power level increases)?

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

Which one of the following represents a fusion reaction that would yield large amounts of energy?

The barrier to fission comes about because the fragments:

Consider the following energies: Rank them in order of increasing value.

Fission fragments usually decay by emitting:

In a nuclear power plant, the power discharged to the environment:

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