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

Which of the following chemical elements is not produced by thermonuclear fusion in stars?

Accepted Answer

A) Carbon (Z = 6, A= 12) 
B) Silicon (Z = 14, A = 28) 
C) Oxygen (Z = 8, A= 16) 
D) Mercury (Z = 80, A = 200) 
E) Chromium (Z = 24, A = 52) 
A) Carbon (Z = 6, A= 12) 
B) Silicon (Z = 14, A = 28) 
C) Oxygen (Z = 8, A= 16) 
D) Mercury (Z = 80, A = 200) 
E) Chromium (Z = 24, A = 52)

Question 3

Most of the energy produced by the Sun is due to:

Accepted Answer

A) nuclear fission 
B) nuclear fusion 
C) chemical reaction 
D) gravitational collapse 
E) induced emfs associated with the Sun's magnetic field 
A) nuclear fission 
B) nuclear fusion 
C) chemical reaction 
D) gravitational collapse 
E) induced emfs associated with the Sun's magnetic field

Question 4

When fissions, the products might be:

Accepted Answer

A) , , and a proton 
B) , , and a neutron 
C) and 
D) , , and an alpha particle 
E) two uranium nuclei 
A) , , and a proton 
B) , , and a neutron 
C) and 
D) , , and an alpha particle 
E) two uranium nuclei

Question 5

The overall proton-proton cycle is equivalent to:

Accepted Answer

A) 21H $\rightarrow$  2H 
B) 41H $\rightarrow$  4H 
C) 41H $\rightarrow$  4H +4n 
D) 41H + 2e- $\rightarrow$ 4He + 2$\nu$+ 6$\gamma$ 
E) 41H + 2e+ $\rightarrow$ 4He + 2$\nu$ 
A) 21H $\rightarrow$  2H 
B) 41H $\rightarrow$  4H 
C) 41H $\rightarrow$  4H +4n 
D) 41H + 2e- $\rightarrow$ 4He + 2$\nu$+ 6$\gamma$ 
E) 41H + 2e+ $\rightarrow$ 4He + 2$\nu$

Question 6

In a subcritical nuclear reactor:

Accepted Answer

A) the number of fission events per unit time decreases with time 
B) the number of fission events per unit time increases with time 
C) each fusion event produces fewer neutrons than when the reactor is critical 
D) each fusion event produces more neutrons than when the reactor is critical 
E) none of the above 
A) the number of fission events per unit time decreases with time 
B) the number of fission events per unit time increases with time 
C) each fusion event produces fewer neutrons than when the reactor is critical 
D) each fusion event produces more neutrons than when the reactor is critical 
E) none of the above

Question 7

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 8

For purposes of a practical (energy producing)reaction one wants a disintegration energy Q that is:

Accepted Answer

A) positive for fusion reactions and negative for fission reactions 
B) negative for fusion reactions and positive for fission reactions 
C) negative for both fusion and fission reactions 
D) positive for both fusion and fission reactions 
E) as close to zero as possible for both fusion and fission reactions 
A) positive for fusion reactions and negative for fission reactions 
B) negative for fusion reactions and positive for fission reactions 
C) negative for both fusion and fission reactions 
D) positive for both fusion and fission reactions 
E) as close to zero as possible for both fusion and fission reactions

Question 9

In a nuclear reactor the fissionable fuel is formed into pellets rather than finely ground and mixed with the moderator.This reduces the probability of:

Accepted Answer

A) non-fissioning absorption of neutrons 
B) loss of neutrons through the reactor container 
C) absorption of two neutrons by single fissionable nucleus 
D) loss of neutrons in the control rods 
E) none of the above 
A) non-fissioning absorption of neutrons 
B) loss of neutrons through the reactor container 
C) absorption of two neutrons by single fissionable nucleus 
D) loss of neutrons in the control rods 
E) none of the above

Question 10

For a controlled nuclear fusion reaction, one needs:

Accepted Answer

A) high number density n and high temperature T 
B) high number density n and low temperature T 
C) low number density n and high temperature T 
D) low number density n and low temperature T 
E) high number density n and temperature T = 0 K 
A) high number density n and high temperature T 
B) high number density n and low temperature T 
C) low number density n and high temperature T 
D) low number density n and low temperature T 
E) high number density n and temperature T = 0 K

Exam 43: Energy From the Nucleus

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

Which of the following chemical elements is not produced by thermonuclear fusion in stars?

Most of the energy produced by the Sun is due to:

When fissions, the products might be:

The overall proton-proton cycle is equivalent to:

In a subcritical nuclear reactor:

Nuclear fusion in the Sun is increasing its supply of:

For purposes of a practical (energy producing)reaction one wants a disintegration energy Q that is:

In a nuclear reactor the fissionable fuel is formed into pellets rather than finely ground and mixed with the moderator.This reduces the probability of:

For a controlled nuclear fusion reaction, one needs:

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