Question 1

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 2

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

Accepted Answer

A)   . decay.
B)   . decay.
C)   . decay.
D)   electron capture.
E)   spontaneous fission.

Question 3

Which of the following types of radioactive decay does not produce new element?

Accepted Answer

A)   gamma emission
B)   electron capture
C)   beta emission
D)   alpha emission
E)   double beta emission

Question 4

The isotope 8" class="answers-bank-image d-inline" rel="preload" > has a half-life of 7.5 seconds. If a sample contains 144 atoms of 8" class="answers-bank-image d-inline" rel="preload" > , approximately how many such atoms were there present 30 seconds earlier?

Accepted Answer

A)   576
B)   1152
C)   2304
D)   4320
E)   4.30 × 108

Question 5

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 6

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)   
B)   
C)   
D)   
E)   none of the above

Question 7

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

Accepted Answer

A)   . decay.
B)   . decay.
C)   . decay.
D)   positron decay.
E)   electron capture.

Question 8

The isotope  1. B)  N/Z is relatively low and Z  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.

Question 9

A N-14 nucleus is hit by a particle, forming a C-14 nucleus and a proton as the only products. Identify the type of particle which struck the N-14 nucleus.

Accepted Answer

A)   alpha
B)   proton
C)   electron
D)   neutron
E)   deuterium

Question 10

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 1020. What is the atomic weight of the unknown element?

Accepted Answer

A)   32 amu
B)   16 amu
C)   8 amu
D)   4 amu
E)   none of the above

Question 11

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)   
B)   
C)   
D)   
E)   none of the above

Question 12

Fill in missing sub- and superscripts for all particles to complete the following equation for positron decay.

Accepted Answer

The answer of Fill in missing sub- and superscripts for...

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

A certain isotope has a specific activity of 7.29 × 10-4 Ci/g. How many  particles will a 75.0 mg sample emit in one hour?

Accepted Answer

A)   9.99 × 104
B)   2.02 × 106
C)   7.28 × 109
D)   1.29 × 1012
E)   none of the above

Question 15

Carbon-14 will emit a  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 the above

Question 16

Iodine-131, t1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 1018  particles per day, how long will it take for the activity to drop to 6.22 × 1017  particles per day?

Accepted Answer

A)   2.0 days
B)   16 days
C)   32 days
D)   128 days
E)   none of the above

Question 17

Which one of the following is an incorrect representation of the indicated particle or nucleus?

Accepted Answer

A)   positron: 
B)   neutron: 
C)   helium-3: 
D)   alpha particle: 
E)   proton:

Question 18

The radioisotope  decay. B)  . decay. C)  . decay. D)  positron decay. E)  electron capture." class="answers-bank-image d-inline" rel="preload" > will decay through

Accepted Answer

A)   . decay.
B)   . decay.
C)   . decay.
D)   positron decay.
E)   electron capture.

Question 19

A 7.85 × 10-5 mol sample of copper-61 emits 1.47 × 1019 positrons in 90.0 minutes. What is the decay constant for copper-61?

Accepted Answer

A)   0.00230 h-1
B)   0.00346 h-1
C)   0.207 h-1
D)   0.311 h-1
E)   none of the above

Question 20

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.

Exam 24: Nuclear Reactions and Their Applications

Which one of the following is an incorrect representation of the indicated particle or nucleus?

Correct AnswerverifiedShow Answer

Fill in missing sub- and superscripts for all particles to complete the following equation for positron decay.

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

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The radioisotope will decay through

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedShow Answer

The isotope is unstable. This is predictable because

Correct AnswerverifiedShow Answer

The isotope has a half-life of 7.5 seconds. If a sample contains 144 atoms of , approximately how many such atoms were there present 30 seconds earlier?

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A 7.85 × 10-5 mol sample of copper-61 emits 1.47 × 1019 positrons in 90.0 minutes. What is the decay constant for copper-61?

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All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 1020. What is the atomic weight of the unknown element?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A N-14 nucleus is hit by a particle, forming a C-14 nucleus and a proton as the only products. Identify the type of particle which struck the N-14 nucleus.

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A certain isotope has a specific activity of 7.29 × 10-4 Ci/g. How many  particles will a 75.0 mg sample emit in one hour?

Correct AnswerverifiedShow Answer

The isotope is unstable. This is predictable because

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedShow Answer

Which of the following types of radioactive decay does not produce new element?

Correct AnswerverifiedShow Answer

Iodine-131, t1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 1018  particles per day, how long will it take for the activity to drop to 6.22 × 1017  particles per day?

Correct AnswerverifiedShow Answer

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A 7.85 × 10^-5 mol sample of copper-61 emits 1.47 × 10¹⁹ positrons in 90.0 minutes. What is the decay constant for copper-61?

Correct Answer
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All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10^-2g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 10²⁰. What is the atomic weight of the unknown element?

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A certain isotope has a specific activity of 7.29 × 10^-4Ci/g. How many  particles will a 75.0 mg sample emit in one hour?

Correct Answer
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Iodine-131, t_1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 10¹⁸  particles per day, how long will it take for the activity to drop to 6.22 × 10¹⁷  particles per day?

Correct Answer
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