Question 1

What is the specific activity (in Ci/g)  of an isotope if 3.56 mg emits 4.26 × 108  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 the aboveF) B) and D)
G) C) and D)

Question 2

The radiochemist, Will I. Glow, studied thorium-232 and found that 2.82 × 10-7 moles emitted 8.42 × 106  particles in one year. What is the decay constant for thorium-232?

Accepted Answer

A)   3.35 × 10-14 yr-1
B)   4.96 × 10-11 yr-1
C)   1.40 × 1010 yr-1
D)   2.99 × 1013 yr-1
E)   none of the aboveF) A) and C)
G) B) and E) B

Question 3

A bottle of vintage red wine has lost its label. The concentration of tritium (  ) in the wine is 0.34 times that found in freshly bottled wines. If the half-life of tritium is 12.3 years, estimate the time elapsed since the wine was bottled.

Accepted Answer

The answer of A bottle of vintage red wine has...

Question 4

When an electron and its anti-particle, a positron, collide, they annihilate each other. Calculate the energy released in this process, in J. (The positron mass is the same as the electron mass, namely 9.11 × 10-31 kg.)

Accepted Answer

Question 5

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 the aboveF) B) and C)
G) B) and D)

Question 6

Calculate to four significant figures
a. the mass defect in kg, and
b. the energy released in kJ/mol, when a neutron decays to produce a proton and an electron. The neutron, proton, and electron masses are 1.67493 × 10-27 kg, 1.67262 × 10-27 kg and 9.10939 × 10-31 kg, respectively.

Accepted Answer

a. 1.399 ×...

Question 7

A patient's thyroid gland is to be exposed to an average of 5.5 Ci for 16 days as an ingested sample of iodine-131 decays. If the energy of the  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 the aboveF) A) and B)
G) A) and C)

Question 8

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

Question 9

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 the aboveF) A) and E)
G) B) and E)

Question 10

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) A) and B)

Question 11

A 9.52 × 10-5 mol sample of rubidium-86 emits 8.87 × 1016  particles in one hour. What is the half-life of rubidium-86?

Accepted Answer

A)   2.23 × 10-3 h
B)   1.55 × 10-3 h
C)   448 h
D)   645 h
E)   none of the aboveF) A) and B)
G) B) and D)

Question 12

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 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

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

Question 16

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

Accepted Answer

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

Question 17

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

Question 18

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 19

Exposure to 10 nCi for 10 minutes is more hazardous for a child than for an adult because

Accepted Answer

A)   the child's cells are dividing more rapidly than the adult's and are, therefore, more susceptible to the radiation.
B)   the child's smaller body size makes the effective dose larger for the child than for the adult.
C)   the child's immune system is not developed well enough to resist damage.
D)   the child's skin is not as thick as an adult's and cannot block as much radiation.
E)   None of the above reasons is correct.F) C) and D)
G) A) and B)

Question 20

Of the naturally-occurring elements on earth today, identify by their chemical symbols
a. two which would have resulted directly from the "big bang".
b. one which can only be formed in supernova explosions.
c. two which are formed during the normal life of first generation stars.

Accepted Answer

a. H, He
b...

Exam 24: Nuclear Reactions and Their Applications

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

Correct AnswerverifiedShow Answer

The radiochemist, Will I. Glow, studied thorium-232 and found that 2.82 × 10-7 moles emitted 8.42 × 106  particles in one year. What is the decay constant for thorium-232?

Correct AnswerverifiedB

A bottle of vintage red wine has lost its label. The concentration of tritium ( ) in the wine is 0.34 times that found in freshly bottled wines. If the half-life of tritium is 12.3 years, estimate the time elapsed since the wine was bottled.

Correct AnswerverifiedShow Answer

When an electron and its anti-particle, a positron, collide, they annihilate each other. Calculate the energy released in this process, in J. (The positron mass is the same as the electron mass, namely 9.11 × 10-31 kg.)

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

Calculate to four significant figures a. the mass defect in kg, and b. the energy released in kJ/mol, when a neutron decays to produce a proton and an electron. The neutron, proton, and electron masses are 1.67493 × 10-27 kg, 1.67262 × 10-27 kg and 9.10939 × 10-31 kg, respectively.

Correct Answerverifieda. 1.399 ×...View AnswerShow Answer

A patient's thyroid gland is to be exposed to an average of 5.5 Ci for 16 days as an ingested sample of iodine-131 decays. If the energy of the  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 descriptions relating to nuclear reactions is correct?

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

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

Correct AnswerverifiedShow Answer

A 9.52 × 10-5 mol sample of rubidium-86 emits 8.87 × 1016  particles in one hour. What is the half-life of rubidium-86?

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

The radioisotope will decay through

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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

Correct Answerverified11ea8ef8_2bb5_f501_ab0a_99f97fc0e0b3_TB5833_11

Exposure to 10 nCi for 10 minutes is more hazardous for a child than for an adult because

Correct AnswerverifiedShow Answer

Of the naturally-occurring elements on earth today, identify by their chemical symbols a. two which would have resulted directly from the "big bang". b. one which can only be formed in supernova explosions. c. two which are formed during the normal life of first generation stars.

Correct Answerverifieda. H, Heb...View AnswerShow Answer

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

Correct Answer
verified

The radiochemist, Will I. Glow, studied thorium-232 and found that 2.82 × 10^-7moles emitted 8.42 × 10⁶  particles in one year. What is the decay constant for thorium-232?

Correct Answer
verified
B

Correct Answer
verified

When an electron and its anti-particle, a positron, collide, they annihilate each other. Calculate the energy released in this process, in J. (The positron mass is the same as the electron mass, namely 9.11 × 10^-31 kg.)

Correct Answer
verified

Correct Answer
verified

Calculate to four significant figures a. the mass defect in kg, and b. the energy released in kJ/mol, when a neutron decays to produce a proton and an electron. The neutron, proton, and electron masses are 1.67493 × 10^-27 kg, 1.67262 × 10^-27 kg and 9.10939 × 10^-31 kg, respectively.

Correct Answer
verified
a. 1.399 ×...
View Answer

A patient's thyroid gland is to be exposed to an average of 5.5 Ci for 16 days as an ingested sample of iodine-131 decays. If the energy of the  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
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

A 9.52 × 10^-5 mol sample of rubidium-86 emits 8.87 × 10¹⁶  particles in one hour. What is the half-life of rubidium-86?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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B

Correct Answer
verified
11ea8ef8_2bb5_f501_ab0a_99f97fc0e0b3_TB5833_11

Correct Answer
verified

Correct Answer
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a. H, He
b...
View Answer