Question 1

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 these choices is correct.F) B) and C)
G) A) and E)

Question 2

Which one of the following descriptions relating to nuclear reactions is correct?

Accepted Answer

A)   The ratio of neutrons to protons remains constant.
B)   The number of protons plus neutrons remains constant.
C)   The number of electron remains constant.
D)   The total charge changes.
E)   The total number of nucleons changes.F) D) and E)
G) C) and D)

Question 3

Palladium-107 undergoes  β\betaβ 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 y F) B) and D)
G) C) and D)

Question 4

Assuming that no other particles are produced, which of the following particles could be used to bombard nitrogen-14 in order to make fluorine-18?

Accepted Answer

A)   alpha particle
B)   beta particle
C)   neutron
D)   proton
E)   positronF) B) and D)
G) B) and C)

Question 5

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 D)
G) A) and C)

Question 6

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\alphaα  decay.) 
C)   ( γ\gammaγ decay.) 
D)   electron capture.
E)   ( β\betaβ  decay.)  F) None of the above
G) B) and D)

Question 7

The radioisotope  will decay through

Accepted Answer

A)   ( α\alphaα  decay.) 
B)   ( β\betaβ decay.) 
C)   ( γ\gammaγ  decay.) 
D)   electron capture.
E)   spontaneous fission. F) B) and D)
G) C) and D)

Question 8

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

Accepted Answer

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

Question 9

Which of the following series of radioactive decays would convert Pa-234 to Ra-226?

Accepted Answer

A)   beta, alpha, beta
B)   alpha, alpha
C)   beta, alpha, alpha, beta
D)   beta, alpha, alpha
E)   alpha, beta, gammaF) B) and E)
G) D) and E)

Question 10

Select the nuclide that completes the following nuclear reaction:

Accepted Answer

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

Question 11

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 is correct.F) A) and B)
G) B) and D)

Question 12

A scintillation counter

Accepted Answer

A)   measures the signal coming from an ionized gas.
B)   measures light emissions from excited atoms.
C)   depends on an avalanche of electrons generated as a particle moves through a tube of argon gas.
D)   detects high energy radiation better than low energy radiation.
E)   detects an electric current in a gas.F) C) and D)
G) C) and E)

Question 13

After 4 half-lives, the fraction of a radioactive isotope which still remains is approximately one-eighth.

Accepted Answer

A) True 
 B)False

Question 14

The r-process occurs during supernova explosions.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) All of the above
G) B) and E)

Question 16

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

Accepted Answer

A)   ( α\alphaα  decay.) 
B)   ( β\betaβ  decay.) 
C)   positron decay.
D)   electron capture.
E)   ( γ\gammaγ  decay.)  F) B) and C)
G) A) and E)

Question 17

Write a complete, balanced equation to represent the electron capture decay of argon-37.

Accepted Answer

The answer of Write a complete, balanced equation to represent...

Question 18

An 85-kg person exposed to barium-141 receives 2.5 * 105  β\betaβ 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 is correct. F) A) and E)
G) B) and D)

Question 19

Cesium-134 is a  β\betaβ  emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134 will remain after 10 years?

Accepted Answer

A)   0.0024 g
B)   0.078 g
C)   0.25 g
D)   0.50 g
E)   None of these choices is correct. F) B) and D)
G) A) and E)

Question 20

What features do the r- and s-processes for element formation have in common? How do they differ?

Accepted Answer

Both involve neutron absorption by a nuc...

Exam 24: Nuclear Reactions and Their Applications

The radioisotope $The radioisotope will decay through A) ( \alpha decay.) B) ( \beta decay.) C) ( \gamma decay.) D) electron capture. E) spontaneous fission.$ will decay through

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

Correct Answer
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Select the nuclide that completes the following nuclear reaction:

Correct Answer
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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?

Correct Answer
verified

Assuming that no other particles are produced, which of the following particles could be used to bombard nitrogen-14 in order to make fluorine-18?

Correct Answer
verified

Write a complete, balanced equation to represent the electron capture decay of argon-37.

Correct Answer
verified

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

Correct Answer
verified

What features do the r- and s-processes for element formation have in common? How do they differ?

Correct Answer
verified
Both involve neutron absorption by a nuc...
View Answer

Correct Answer
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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 Answer
verified

A scintillation counter

Correct Answer
verified

Which of the following series of radioactive decays would convert Pa-234 to Ra-226?

Correct Answer
verified

Cesium-134 is a $\beta$ emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134 will remain after 10 years?

Correct Answer
verified

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

Correct Answer
verified

After 4 half-lives, the fraction of a radioactive isotope which still remains is approximately one-eighth.

Correct Answer
verified

Which one of the following descriptions relating to nuclear reactions is correct?

Correct Answer
verified

The r-process occurs during supernova explosions.

Correct Answer
verified

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

Correct Answer
verified

Palladium-107 undergoes $\beta$ 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?

Correct Answer
verified

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

Correct Answer
verified

Exam 24: Nuclear Reactions and Their Applications

The radioisotope will decay through

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction:

Correct AnswerverifiedShow Answer

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

Assuming that no other particles are produced, which of the following particles could be used to bombard nitrogen-14 in order to make fluorine-18?

Correct AnswerverifiedShow Answer

Write a complete, balanced equation to represent the electron capture decay of argon-37.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What features do the r- and s-processes for element formation have in common? How do they differ?

Correct AnswerverifiedBoth involve neutron absorption by a nuc...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

A scintillation counter

Correct AnswerverifiedShow Answer

Which of the following series of radioactive decays would convert Pa-234 to Ra-226?

Correct AnswerverifiedShow Answer

Cesium-134 is a β\betaβ emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134 will remain after 10 years?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

After 4 half-lives, the fraction of a radioactive isotope which still remains is approximately one-eighth.

Correct AnswerverifiedShow Answer

Which one of the following descriptions relating to nuclear reactions is correct?

Correct AnswerverifiedShow Answer

The r-process occurs during supernova explosions.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Palladium-107 undergoes β\betaβ 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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The radioisotope $The radioisotope will decay through A) ( \alpha decay.) B) ( \beta decay.) C) ( \gamma decay.) D) electron capture. E) spontaneous fission.$ will decay through

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
Both involve neutron absorption by a nuc...
View Answer

Correct Answer
verified

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 Answer
verified

Correct Answer
verified

Correct Answer
verified

Cesium-134 is a $\beta$ emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134 will remain after 10 years?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Palladium-107 undergoes $\beta$ 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?

Correct Answer
verified

Correct Answer
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