Question 1

Nuclear power reactors cannot explode like an atom bomb because there is not enough of the fissionable U-235 in a reactor to maintain a chain reaction.

Accepted Answer

A) True 
 B)False

Question 2

The amount of radiation we are naturally exposed to during a year is nearly

Accepted Answer

A)  150 rem.
B)  100 rem.
C)  1 rem.
D)  0.150 rem.E) A) and B)
F) A) and C)

Question 3

A measure of radiation that takes into account the possible biological damage produced by different types of radiation is called a

Accepted Answer

A)  rem.
B)  rad.
C)  roentgen.
D)  curie.E) A) and B)
F) None of the above

Question 4

The isotope  is most likely to emit

Accepted Answer

A)  an alpha particle.
B)  a beta particle.
C)  a gamma ray.
D)  It is not possible to predict.E) None of the above
F) All of the above A

Question 5

The decay rate of a radioactive isotope can be increased by increasing the

Accepted Answer

A)  temperature.
B)  pressure.
C)  size of the sample.
D)  None of the above.E) B) and C)
F) A) and C) C

Question 6

The mass of a nucleus is slightly greater than the sum of the masses of the individual protons and neutrons.

Accepted Answer

A) True 
 B)False

Question 7

Isotope A has a half-life measured in minutes, whereas isotope B has a half-life of millions of years.Which is more radioactive?

Accepted Answer

A)  isotope A
B)  isotope B
C)  Both are equally dangerous.
D)  It depends on the temperature of each.E) C) and D)
F) A) and C)

Question 8

A Geiger counter measures radiation indirectly by measuring

Accepted Answer

A)  flashes of light.
B)  speaker static.
C)  electrons released by ionization.
D)  curies.E) B) and D)
F) B) and C)

Question 9

The threshold model proposes that under a certain level, your body can repair the damage produced by radiation.

Accepted Answer

A) True 
 B)False

Question 10

A radioactive decay reaction produces a simpler, more stable nucleus.

Accepted Answer

A) True 
 B)False

Question 11

This type of radiation is released when  decays to  .

Accepted Answer

A)  alpha
B)  beta
C)  gamma
D)  All of the above.E) C) and D)
F) A) and B)

Question 12

The basic requirement for a fusion reaction is (are)

Accepted Answer

A)  temperature on the order of 100 million  ∘\circ∘ C.
B)  dense concentration of hydrogen nuclei.
C)  confinement at 10 atmospheres pressure for at least one second.
D)  All of the above. E) C) and D)
F) B) and C)

Question 13

The radioactive isotope Z has a half-life of 12 hours.After 2 days, the fraction of the original amount remaining is

Accepted Answer

A)  1/2.
B)  1/4.
C)  1/8.
D)  1/16.E) None of the above
F) A) and C) D

Question 14

Which of the following correctly balances this decay reaction?  ___

Accepted Answer

A)   
B)   
C)   
D)   E) A) and B)
F) A) and C)

Question 15

Alpha radiation is the least dangerous as alpha particles can be stopped by your skin.

Accepted Answer

A) True 
 B)False

Question 16

This type of radiation ionizes atoms and molecules.

Accepted Answer

A)  alpha
B)  beta
C)  gamma
D)  All of the above.E) B) and C)
F) A) and B)

Question 17

Airline crews receive roughly three times the background radiation of those of us who spend most of our time on the ground.

Accepted Answer

A) True 
 B)False

Question 18

Besides U-235, another isotope that can undergo nuclear fission is

Accepted Answer

A)  U-238.
B)  Pu-239.
C)  Th-230.
D)  Pb-210.E) A) and B)
F) A) and C)

Question 19

Nuclei with a higher than desired neutron-to-proton ratios tend to undergo which type of decay?

Accepted Answer

A)  alpha
B)  beta
C)  gamma
D)  All of the above.E) A) and B)
F) B) and D)

Question 20

X undergoes radioactive decay to Y with a half-life of five minutes.After 10 minutes, the sample of X has completely decayed to Y.

Accepted Answer

A) True 
 B)False

Exam 13: Nuclear Reactions

Nuclear power reactors cannot explode like an atom bomb because there is not enough of the fissionable U-235 in a reactor to maintain a chain reaction.

Correct AnswerverifiedShow Answer

The amount of radiation we are naturally exposed to during a year is nearly

Correct AnswerverifiedShow Answer

A measure of radiation that takes into account the possible biological damage produced by different types of radiation is called a

Correct AnswerverifiedShow Answer

The isotope is most likely to emit

Correct AnswerverifiedA

The decay rate of a radioactive isotope can be increased by increasing the

Correct AnswerverifiedC

The mass of a nucleus is slightly greater than the sum of the masses of the individual protons and neutrons.

Correct AnswerverifiedShow Answer

Isotope A has a half-life measured in minutes, whereas isotope B has a half-life of millions of years.Which is more radioactive?

Correct AnswerverifiedShow Answer

A Geiger counter measures radiation indirectly by measuring

Correct AnswerverifiedShow Answer

The threshold model proposes that under a certain level, your body can repair the damage produced by radiation.

Correct AnswerverifiedShow Answer

A radioactive decay reaction produces a simpler, more stable nucleus.

Correct AnswerverifiedShow Answer

This type of radiation is released when decays to .

Correct AnswerverifiedShow Answer

The basic requirement for a fusion reaction is (are)

Correct AnswerverifiedShow Answer

The radioactive isotope Z has a half-life of 12 hours.After 2 days, the fraction of the original amount remaining is

Correct AnswerverifiedD

Which of the following correctly balances this decay reaction? ___

Correct AnswerverifiedShow Answer

Alpha radiation is the least dangerous as alpha particles can be stopped by your skin.

Correct AnswerverifiedShow Answer

This type of radiation ionizes atoms and molecules.

Correct AnswerverifiedShow Answer

Airline crews receive roughly three times the background radiation of those of us who spend most of our time on the ground.

Correct AnswerverifiedShow Answer

Besides U-235, another isotope that can undergo nuclear fission is

Correct AnswerverifiedShow Answer

Nuclei with a higher than desired neutron-to-proton ratios tend to undergo which type of decay?

Correct AnswerverifiedShow Answer

X undergoes radioactive decay to Y with a half-life of five minutes.After 10 minutes, the sample of X has completely decayed to Y.

Correct AnswerverifiedShow Answer

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C

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D

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