Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

The s-process involves a slow succession of neutron absorption and beta decay processes during the normal life of a star.

Accepted Answer

A) True 
 B)False

Question 4

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

Question 5

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)   
B)   
C)   
D)   
E)   None of these choices are correct.F) A) and B)
G) None of the above

Question 6

Most foodstuffs contain natural, radioactive isotopes.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

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

Question 8

The r-process occurs during supernova explosions.

Accepted Answer

A) True 
 B)False

Question 9

Cesium-134 is a β 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 are correct.F) B) and E)
G) D) and E)

Question 10

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 × 108F) B) and E)
G) D) and E)

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)  
B)   
C)   
D)   
E)   None of these choices are correct.F) All of the above
G) A) and B)

Question 13

A certain isotope has a specific activity of 7.29 × 10-4 Ci/g. How many α 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 these choices are correct.F) C) and D)
G) A) and B)

Question 14

Gamma rays are high energy electrons.

Accepted Answer

A) True 
 B)False

Question 15

No alpha decay is observed for isotopes of elements with Z < 83.

Accepted Answer

A) True 
 B)False

Question 16

The radioisotope  will decay through

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

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

Question 19

The isotopes of promethium,    are unstable, and lie on opposite sides of the  line of stability . Which of the following combinations is most likely to represent the type of decay for these isotopes? A)  promethium-144, β decay; promethium-134, positron decay B)  promethium-144, positron decay; promethium-134, β decay C)  promethium-144, positron decay; promethium-134, electron capture D)  promethium-144, electron capture; promethium-134, positron decay E)  promethium-144, β decay; promethium-134,   decay" class="answers-bank-image d-inline" rel="preload" > and    are unstable, and lie on opposite sides of the  line of stability . Which of the following combinations is most likely to represent the type of decay for these isotopes? A)  promethium-144, β decay; promethium-134, positron decay B)  promethium-144, positron decay; promethium-134, β decay C)  promethium-144, positron decay; promethium-134, electron capture D)  promethium-144, electron capture; promethium-134, positron decay E)  promethium-144, β decay; promethium-134,   decay" class="answers-bank-image d-inline" rel="preload" >    are unstable, and lie on opposite sides of the "line of stability". Which of the following combinations is most likely to represent the type of decay for these isotopes?

Accepted Answer

A)   promethium-144, β decay; promethium-134, positron decay
B)   promethium-144, positron decay; promethium-134, β decay
C)   promethium-144, positron decay; promethium-134, electron capture
D)   promethium-144, electron capture; promethium-134, positron decay
E)   promethium-144, β decay; promethium-134,    are unstable, and lie on opposite sides of the  line of stability . Which of the following combinations is most likely to represent the type of decay for these isotopes? 
A)   promethium-144, β decay; promethium-134, positron decay 
B)   promethium-144, positron decay; promethium-134, β decay 
C)   promethium-144, positron decay; promethium-134, electron capture 
D)   promethium-144, electron capture; promethium-134, positron decay 
E)   promethium-144, β decay; promethium-134,   decay" class="answers-bank-image d-inline" rel="preload" > decayF) B) and E)
G) B) and D) A

Question 20

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 are correct.F) C) and D)
G) B) and D)

Exam 24: Nuclear Reactions and Their Applications

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

The s-process involves a slow succession of neutron absorption and beta decay processes during the normal life of a star.

Correct AnswerverifiedShow Answer

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

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedShow Answer

Most foodstuffs contain natural, radioactive isotopes.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The r-process occurs during supernova explosions.

Correct AnswerverifiedShow Answer

Cesium-134 is a β 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

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Gamma rays are high energy electrons.

Correct AnswerverifiedShow Answer

No alpha decay is observed for isotopes of elements with Z < 83.

Correct AnswerverifiedShow Answer

The radioisotope will decay through

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedE

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedShow Answer

The isotopes of promethium, and are unstable, and lie on opposite sides of the "line of stability". Which of the following combinations is most likely to represent the type of decay for these isotopes?

Correct AnswerverifiedA

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

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A

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

Correct Answer
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E

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A

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
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