Question 1

What is the specific activity (in Ci/g)  of an isotope if 3.56 mg emits 4.26 × 108 β particles per second?

Accepted Answer

A)   0.003232 Ci/g
B)   0.0115 Ci/g
C)   0.309 Ci/g
D)   3.23 Ci/g
E)   None of these choices are correct.F) B) and C)
G) All of the above

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) A) and B)
G) B) and E)

Question 3

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 × 104 kJ
C)   1.32 × 106 kJ
D)   1.32 × 109 kJ
E)   None of these choices are correct.F) B) and D)
G) C) and D)

Question 4

In living organisms, C-14 atoms disintegrate at a rate of 15.3 atoms per minute per gram of carbon. A charcoal sample from an archaeological site has a C-14 disintegration rate of 9.16 atoms per minute per gram of carbon. Estimate the age of this sample. The half-life of C-14 is 5730 years.

Accepted Answer

A)   3170 years
B)   3430 years
C)   4020 years
D)   4790 years
E)   6750 yearsF) C) and D)
G) A) and E)

Question 5

Palladium-107 undergoes β decay (t1/2 = 6.5 × 105 yr)  to form silver-107. How long will it take for 0.150 mol of silver-107 to form from 1.25 mol of palladium-107?

Accepted Answer

A)   2.0 × 107 y
B)   1.4 × 107 y
C)   1.2 × 106 y
D)   8.3 × 105 y
E)   1.2 × 105 yF) A) and E)
G) A) and C)

Question 6

Which one of the following is a subatomic particle closely related to the positron?

Accepted Answer

A)   proton
B)   electron
C)   negatron
D)   neutron
E)   neutrinoF) C) and D)
G) A) and C)

Question 7

The isotope  is unstable. This is predictable because

Accepted Answer

A)   N/Z ≠ 1.
B)   N/Z is relatively low and Z 
C)   N/Z is relatively large and Z 
D)   Z is small.
E)   N is large.F) A) and B)
G) None of the above

Question 8

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

Accepted Answer

A)   positron decay.
B)   alpha decay.
C)   beta decay.
D)   gamma decay.
E)   fission.F) A) and C)
G) A) and D)

Question 9

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) B) and D)

Question 10

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)    decay.
D)   electron capture.
E)   β decay.F) A) and D)
G) C) and E)

Question 11

Identify the missing species in the following nuclear transmutation.

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) None of the above
G) A) and C)

Question 12

Which of the following materials is put into a nuclear reactor to slow the chain reaction?

Accepted Answer

A)   heavy water
B)   moderators
C)   control rods
D)   reflectors
E)   chlorineF) C) and E)
G) C) and D)

Question 13

The radioisotope  will decay through

Accepted Answer

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

Question 14

Which of the following isotopes is definitely unstable?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) None of the above
G) C) and E)

Question 15

An 85-kg person exposed to barium-141 receives 2.5 × 105 β particles, each with an energy of 5.2 × 10-13 J. How many rads does the person receive?

Accepted Answer

A)   2.4 × 10-20
B)   1.5 × 10-7
C)   1.8 × 10-16
D)   6.1 × 10-15
E)   None of these choices are correct.F) A) and E)
G) A) and B)

Question 16

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

Accepted Answer

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

Question 17

An isotope with Z > 83, which lies close to the band of stability, will generally decay through

Accepted Answer

A)   α decay.
B)   β decay.
C)    83, which lies close to the band of stability, will generally decay through 
A)   α decay. 
B)   β decay. 
C)     decay. 
D)   positron decay. 
E)   electron capture." class="answers-bank-image d-inline" rel="preload" > decay.
D)   positron decay.
E)   electron capture.F) B) and E)
G) B) and D)

Question 18

An isotope with a high value of N/Z will tend to decay through

Accepted Answer

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

Question 19

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

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

Question 20

A 55-kg person exposed to thorium-234 receives 7.5 × 104 β particles, each with an energy of 1.6 × 10-14 J. How many rads does the person receive?

Accepted Answer

A)   2.1 × 10-19
B)   1.2 × 10-17
C)   2.2 × 10-9
D)   1.2 × 10-9
E)   None of these choices are correct.F) B) and E)
G) A) and D)

Exam 24: Nuclear Reactions and Their Applications

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

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

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The radioisotope will decay through

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Which of the following isotopes is definitely unstable?

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An isotope with a high value of N/Z will tend to decay through

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What is the specific activity (in Ci/g) of an isotope if 3.56 mg emits 4.26 × 108 β particles per second?

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

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An isotope with Z > 83, which lies close to the band of stability, will generally decay through

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Palladium-107 undergoes β decay (t1/2 = 6.5 × 105 yr) to form silver-107. How long will it take for 0.150 mol of silver-107 to form from 1.25 mol of palladium-107?

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Which one of the following is a subatomic particle closely related to the positron?

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Identify the missing species in the following nuclear transmutation.

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Select the nuclide that completes the following nuclear reaction.

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The isotope is unstable. This is predictable because

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Which of the following materials is put into a nuclear reactor to slow the chain reaction?

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

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A 55-kg person exposed to thorium-234 receives 7.5 × 104 β particles, each with an energy of 1.6 × 10-14 J. How many rads does the person receive?

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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?

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In living organisms, C-14 atoms disintegrate at a rate of 15.3 atoms per minute per gram of carbon. A charcoal sample from an archaeological site has a C-14 disintegration rate of 9.16 atoms per minute per gram of carbon. Estimate the age of this sample. The half-life of C-14 is 5730 years.

Correct AnswerverifiedShow Answer

An 85-kg person exposed to barium-141 receives 2.5 × 105 β particles, each with an energy of 5.2 × 10-13 J. How many rads does the person receive?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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What is the specific activity (in Ci/g) of an isotope if 3.56 mg emits 4.26 × 10⁸ β particles per second?

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Palladium-107 undergoes β decay (t_1/2 = 6.5 × 10⁵ yr) to form silver-107. How long will it take for 0.150 mol of silver-107 to form from 1.25 mol of palladium-107?

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A 55-kg person exposed to thorium-234 receives 7.5 × 10⁴ β particles, each with an energy of 1.6 × 10^-14 J. How many rads does the person receive?

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An 85-kg person exposed to barium-141 receives 2.5 × 10⁵ β particles, each with an energy of 5.2 × 10^-13 J. How many rads does the person receive?

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