Question 1

Sodium-21 will emit positrons each having an energy of 4.0 *10¯13 J. What is this energy in MeV?

Accepted Answer

A)   4.0 *10¯7 MeV
B)   2.5 MeV
C)   40 MeV
D)   2.5 * 106 MeV
E)   None of these choices is correct.F) C) and D)
G) B) and C)

Question 2

Select the nuclide that completes the following nuclear reaction:

Accepted Answer

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

Question 3

Write a complete, balanced equation to represent the alpha decay of radon-210.

Accepted Answer

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

Question 4

A certain isotope has a specific activity of 7.29 * 10¯4 Ci/g. How many  α\alphaα 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 is correct. F) C) and D)
G) A) and E)

Question 5

Gamma rays are high energy electrons.

Accepted Answer

A) True 
 B)False

Question 6

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)   deuteriumF) B) and D)
G) All of the above

Question 7

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

Question 8

Which one of the following equations correctly represents electron capture by the  nucleus?

Accepted Answer

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

Question 9

What is the specific activity (in Ci/g)  of an isotope if 3.56 mg emits 4.26* 108  β\betaβ  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 is correct. F) C) and D)
G) A) and B)

Question 10

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 11

A patient's thyroid gland is to be exposed to an average of 5.5 µCi for 16 days as an ingested sample of iodine-131 decays. If the energy of the  β\betaβ radiation is 9.7 * 10¯14 J and the mass of the thyroid is 32.0 g, what is the dose received by the patient?

Accepted Answer

A)   0.027 rads
B)   1.2 rads
C)   37 rads
D)   85 rads
E)   None of these choices is correct. F) All of the above
G) C) and D)

Question 12

Which one of the following elements is formed largely in supernova explosions?

Accepted Answer

A)   H
B)   He
C)   Mg
D)   Fe
E)   UF) C) and E)
G) None of the above

Question 13

Most foodstuffs contain natural, radioactive isotopes.

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

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

Question 17

What is the mechanism by which control rods slow down the fission rate in a nuclear reactor?

Accepted Answer

Control rods absorb neutrons which would...

Question 18

Radioactive decay follows zero-order kinetics.

Accepted Answer

A) True 
 B)False

Question 19

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  β\betaβ  particles per day, how long will it take for the activity to drop to 6.22 * 1017  β\betaβ  particles per day?

Accepted Answer

A)   2.0 days
B)   16 days
C)   32 days
D)   128 days
E)   None of these choices is correct. F) A) and B)
G) A) and C)

Question 20

Select the nuclide that completes the following nuclear reaction:

Accepted Answer

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

Exam 24: Nuclear Reactions and Their Applications

Select the nuclide that completes the following nuclear reaction:

Correct AnswerverifiedShow Answer

Most foodstuffs contain natural, radioactive isotopes.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction:

Correct AnswerverifiedShow Answer

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

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which one of the following elements is formed largely in supernova explosions?

Correct AnswerverifiedShow Answer

Gamma rays are high energy electrons.

Correct AnswerverifiedShow Answer

Write a complete, balanced equation to represent the alpha decay of radon-210.

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 β\betaβ particles per day, how long will it take for the activity to drop to 6.22 * 1017 β\betaβ particles per day?

Correct AnswerverifiedShow Answer

Which one of the following equations correctly represents electron capture by the nucleus?

Correct AnswerverifiedShow Answer

Sodium-21 will emit positrons each having an energy of 4.0 *10¯13 J. What is this energy in MeV?

Correct AnswerverifiedShow Answer

What is the mechanism by which control rods slow down the fission rate in a nuclear reactor?

Correct AnswerverifiedControl rods absorb neutrons which would...View AnswerShow Answer

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

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

Correct AnswerverifiedShow Answer

Radioactive decay follows zero-order kinetics.

Correct AnswerverifiedShow Answer

A patient's thyroid gland is to be exposed to an average of 5.5 µCi for 16 days as an ingested sample of iodine-131 decays. If the energy of the β\betaβ radiation is 9.7 * 10¯14 J and the mass of the thyroid is 32.0 g, what is the dose received by the patient?

Correct AnswerverifiedShow Answer

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

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 $\beta$ particles per second?

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A certain isotope has a specific activity of 7.29 * 10¯⁴ Ci/g. How many $\alpha$ particles will a 75.0 mg sample emit in one hour?

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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 $\beta$ particles per day, how long will it take for the activity to drop to 6.22 10¹⁷ $\beta$ particles per day?

Correct Answer
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Correct Answer
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Sodium-21 will emit positrons each having an energy of 4.0 *10¯¹³ J. What is this energy in MeV?

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Correct Answer
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Control rods absorb neutrons which would...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A patient's thyroid gland is to be exposed to an average of 5.5 µCi for 16 days as an ingested sample of iodine-131 decays. If the energy of the $\beta$ radiation is 9.7 * 10¯¹⁴ J and the mass of the thyroid is 32.0 g, what is the dose received by the patient?

Correct Answer
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Correct Answer
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