Question 1

An isotope with a low value of N/Z will generally decay through

Accepted Answer

A)  α decay.
B)  β decay.
C)  γ decay.
D)  electron capture.
E)  spontaneous fission.F) A) and B)
G) D) and E)

Question 2

Which one of the following nuclei has a magic number of neutrons and/or protons?

Accepted Answer

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

Question 3

Gamma rays are not deflected by an electric field.

Accepted Answer

A) True 
 B)False

Question 4

Carbon-14 will emit a β particle with an energy of 0.1565 MeV. What is this energy in joules?

Accepted Answer

A)  1.0 × 10 -24 J
B)  2.5 × 10 -20 J
C)  1.0 × 10 -18 J
D)  2.5 × 10 -14 J
E)  None of these choices are correct.F) B) and C)
G) B) and D)

Question 5

The radioisotope  will decay through

Accepted Answer

A)  α decay.
B)  β decay.
C)  γ decay.
D)  positron decay.
E)  electron capture.F) A) and B)
G) A) and D)

Question 6

Gamma rays are high energy electrons.

Accepted Answer

A) True 
 B)False

Question 7

A 30.0-kg child receives 2.65 × 107 β particles, each with an energy of 4.60 × 10-13 J. If the RBE = 0.78, how many millirem did the child receive?

Accepted Answer

A)  3.2 × 10 -7
B)  5.2 × 10 -7
C)  5.2 × 10 -4
D)  3.2 × 10 -2
E)  None of these choices are correct.F) C) and D)
G) A) and B)

Question 8

The (negative) binding energy per nucleon reaches a maximum for the isotope

Accepted Answer

A) True 
 B)False

Question 9

The isotopes  are all stable, while  is radioactive. The mode of decay for  is most likely to be

Accepted Answer

A)  positron decay.
B)  α decay.
C)  γ decay.
D)  electron capture.
E)  β decay.F) D) and E)
G) C) and D)

Question 10

Which of the following isotopes is most likely to be unstable?

Accepted Answer

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

Question 11

Gamma-rays and X-rays interact with matter, causing

Accepted Answer

A)  formation of ions, but no free radicals.
B)  formation of free radicals, but no ions.
C)  nuclear transmutation reactions.
D)  formation of ions and free radicals.
E)  formation of ions and nuclear transmutation reactions.F) B) and C)
G) A) and E) D

Question 12

Calcium-39 undergoes positron decay. Each positron carries 5.49 MeV of energy. How much energy will be emitted when 0.0025 mol of calcium-39 decays?

Accepted Answer

A)  13.2 kJ
B)  1.32 × 10 4 kJ
C)  1.32 × 10 6 kJ
D)  1.32 × 10 9 kJ
E)  None of these choices are correct.F) B) and D)
G) A) and B)

Question 13

Exposure to 10 nCi for 10 minutes is more hazardous for a child than for an adult because

Accepted Answer

A)  the child's cells are dividing more rapidly than the adult's and are, therefore, more susceptible to the radiation.
B)  the child's smaller body size makes the effective dose larger for the child than for the adult.
C)  the child's immune system is not developed well enough to resist damage.
D)  the child's skin is not as thick as an adult's and cannot block as much radiation.
E)  None of these choices are correct.F) A) and B)
G) C) and E)

Question 14

The difference between the rad and the rem is

Accepted Answer

A)  the rem is a rad per year.
B)  the rad takes into account the type of radiation.
C)  the rem takes into account the effect on the particular biological tissue.
D)  the rem is a rad per kilogram.
E)  None of these choices are correct.F) A) and C)
G) B) and E)

Question 15

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

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

Question 16

An alkaline earth element is radioactive. It and its daughter elements decay by emitting a total of three alpha particles in succession. In what group of the periodic table is the element resulting from the emission of the third alpha particle?

Accepted Answer

A)  4A (14) 
B)  5A (15) 
C)  6A (16) 
D)  7A (17) 
E)  8A (18) F) C) and E)
G) A) and B)

Question 17

A 9.52 × 10-5 mol sample of rubidium-86 emits 8.87 × 1016 β particles in one hour. What is the half-life of rubidium-86?

Accepted Answer

A)  2.23 × 10 -3 h
B)  1.55 × 10 -3 h
C)  448 h
D)  645 h
E)  None of these choices are correct.F) B) and D)
G) D) and E)

Question 18

Which of the following isotopes is most likely to be unstable?

Accepted Answer

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

Question 19

The isotope  is unstable. This is predictable because

Accepted Answer

A)  the number of neutrons is too large in relation to the number of protons.
B)  the number of neutrons is too small in relation to the number of protons.
C)  the atomic number is too large.
D)  the mass number is too large.
E)  Sc isotopes are all unstable.F) C) and E)
G) A) and D)

Question 20

Which one of the following equations correctly represents positron decay of  ?

Accepted Answer

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

Exam 24: Nuclear Reactions and Their Applications

An isotope with a low value of N/Z will generally decay through

Correct AnswerverifiedShow Answer

Which one of the following nuclei has a magic number of neutrons and/or protons?

Correct AnswerverifiedB

Gamma rays are not deflected by an electric field.

Correct AnswerverifiedShow Answer

Carbon-14 will emit a β particle with an energy of 0.1565 MeV. What is this energy in joules?

Correct AnswerverifiedShow Answer

The radioisotope will decay through

Correct AnswerverifiedShow Answer

Gamma rays are high energy electrons.

Correct AnswerverifiedShow Answer

A 30.0-kg child receives 2.65 × 107 β particles, each with an energy of 4.60 × 10-13 J. If the RBE = 0.78, how many millirem did the child receive?

Correct AnswerverifiedShow Answer

The (negative) binding energy per nucleon reaches a maximum for the isotope

Correct AnswerverifiedShow Answer

The isotopes are all stable, while is radioactive. The mode of decay for is most likely to be

Correct AnswerverifiedShow Answer

Which of the following isotopes is most likely to be unstable?

Correct AnswerverifiedShow Answer

Gamma-rays and X-rays interact with matter, causing

Correct AnswerverifiedD

Calcium-39 undergoes positron decay. Each positron carries 5.49 MeV of energy. How much energy will be emitted when 0.0025 mol of calcium-39 decays?

Correct AnswerverifiedShow Answer

Exposure to 10 nCi for 10 minutes is more hazardous for a child than for an adult because

Correct AnswerverifiedShow Answer

The difference between the rad and the rem is

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedA

An alkaline earth element is radioactive. It and its daughter elements decay by emitting a total of three alpha particles in succession. In what group of the periodic table is the element resulting from the emission of the third alpha particle?

Correct AnswerverifiedShow Answer

A 9.52 × 10-5 mol sample of rubidium-86 emits 8.87 × 1016 β particles in one hour. What is the half-life of rubidium-86?

Correct AnswerverifiedShow Answer

Which of the following isotopes is most likely to be unstable?

Correct AnswerverifiedShow Answer

The isotope is unstable. This is predictable because

Correct AnswerverifiedShow Answer

Which one of the following equations correctly represents positron decay of ?

Correct AnswerverifiedShow Answer

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B

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A 30.0-kg child receives 2.65 × 10⁷ β particles, each with an energy of 4.60 × 10^-¹³ J. If the RBE = 0.78, how many millirem did the child receive?

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D

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A

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A 9.52 × 10^-⁵ mol sample of rubidium-86 emits 8.87 × 10¹⁶ β particles in one hour. What is the half-life of rubidium-86?

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