Question 1

Atoms of an element that have different atomic masses are called

Accepted Answer

A)   ions.
B)   isobars.
C)   isotopes.
D)   metastable.
E)   dielectrics.F) A) and B)
G) D) and E)

Question 2

A fusion reaction that is highly probable is  The amount of fusion energy released in this reaction is approximately

Accepted Answer

A)   1.0 MeV.
B)   2.0 MeV.
C)   3.0 MeV.
D)   4.0 MeV.
E)   5.0 MeV.F) B) and E)
G) B) and C)

Question 3

In what type of radioactive decay are the mass numbers of the parent and daughter nuclei the same?

Accepted Answer

A)   alpha
B)   beta
C)   gamma
D)   both alpha and beta
E)   both beta and gammaF) A) and B)
G) A) and E)

Question 4

The half-life of phosphorus-32 is 14.3 d. If you have 1.00 g of phosphorous-32 today, the amount remaining in 10 d will be approximately

Accepted Answer

A)   700 mg.
B)   650 mg.
C)   616 mg.
D)   384 mg.
E)   350 mg.F) A) and D)
G) A) and E)

Question 5

Which of the following radioactive decay products has the largest electric charge?

Accepted Answer

A)   alpha particles
B)   beta particles
C)   gamma rays
D)   neutrons
E)   All of these have the same charge.F) C) and D)
G) B) and E)

Question 6

The graph shows the number of undecayed atoms as a function of time. The half-life of this radioactive element is approximately

Accepted Answer

A)   1 s.
B)   2 s.
C)   10 s.
D)   4 s.
E)   5 s.F) All of the above
G) None of the above

Question 7

The radius of the 64Ni nucleus is approximately

Accepted Answer

A)   1.2 fm.
B)   2.4 fm.
C)   4.8 fm.
D)   16 fm.
E)   64 fm.F) A) and E)
G) D) and E)

Question 8

In positron emission tomography PET)  scans, a very small amount of a radioactive drug is given to a patient. Fluorine-18 doped or labeled fluorodeoxyglucose, also called FDG, is a radioactive version of the sugar glucose with a half-life of 110 minutes. Once injected into the body, it will go to places where glucose is used for energy. For example, FDG will go to the brain, and, in particular, to those parts of the brain that are actively burning glucose for energy. A variety of different images are observed depending on the parts of the brain being used in certain tasks, such as reading or listening. If the patient came back at the same time the next day after their initial injection for a further scan, how much of the original fluorine-18 decay rate would remain?

Accepted Answer

A)   zero
B)   1.15 × 10-2 %
C)   3.53 × 10-2 %
D)   5.41 × 10-2 %
E)   5.41 × 10-4 %F) C) and D)
G) C) and E)

Question 9

The alpha particles from a naturally radioactive decay have a kinetic energy of 4.25 MeV. How close does an alpha particle come within a gold nucleus if the particle is heading directly toward the nucleus? Give your answer in terms of number of radii of the gold atom, r = 7.0 fm.

Accepted Answer

A)   2
B)   8
C)   12
D)   15
E)   19F) B) and D)
G) C) and E)

Question 10

Two nuclides that are isotopes could lie on curve

Accepted Answer

A)   1.
B)   2.
C)   3.
D)   4.
E)   5.F) A) and B)
G) B) and C)

Question 11

Radon 222Rn is a radioactive gas produced as part of the natural decay chain of uranium. Because it is a gas, it can pose a health problem through inhalation, especially when high concentrations accumulate in homes. Suppose 5 × 108 radon atoms are present in a basement at some time. If the basement is sealed and left, then how many radon atoms remain after a month 31 days) ? The half-life of 222Rn is 3.82 days.)

Accepted Answer

A)   1.81 × 106 
B)   1.49 × 105 
C)   1.23 × 106
D)   6.16 × 107
E)   None of these is correct.F) A) and C)
G) B) and E)

Question 12

The half-life of a radioactive substance is 5 min. Which of the following statements is true of the decay of this substance?

Accepted Answer

A)   After 10 min, one-fourth of the original substance remains.
B)   The amount of the substance remaining after a given time is proportional to the number of minutes.
C)   The amount of the substance remaining after a given time is inversely proportional to the number of minutes.
D)   After 10 min, none of the original substance remains unchanged.
E)   None of these is correct.F) B) and C)
G) A) and E)

Question 13

One way to think about the low binding energy Eb)  per nucleon for low A numbers is b)  per nucleon for low A numbers is   A)  that there are few protons, hence there is less electrostatic repulsion. B)  that there are few electrons to provide the electrostatic attraction. C)  at low A the number of nearest neighbors per nucleon is small compared to higher A numbers. D)  at low A, the nucleus is less spherical, hence there is less surface tension. E)  None of the above statements is correct." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   that there are few protons, hence there is less electrostatic repulsion.
B)   that there are few electrons to provide the electrostatic attraction.
C)   at low A the number of nearest neighbors per nucleon is small compared to higher A numbers.
D)   at low A, the nucleus is less spherical, hence there is less surface tension.
E)   None of the above statements is correct.F) A) and B)
G) All of the above

Question 14

A radioactive nucleus with Z = 92 and A = 235 decays through a series of alpha, beta, and gamma emissions to a stable nucleus with Z = 82 and A = 207. The number of alpha particles and the number of beta particles emitted during the entire process are

Accepted Answer

A)   8 alpha particles and 6 beta particles.
B)   7 alpha particles and 4 beta particles.
C)   7 alpha particles and 10 beta particles.
D)   14 alpha particles and 7 beta particles.
E)   None of these is correct.F) A) and D)
G) A) and E)

Question 15

The nuclear radius of  is approximately

Accepted Answer

A)   1.05 fm.
B)   3.60 fm.
C)   0.350 fm.
D)   11.2 fm.
E)   1.85 fm.F) A) and E)
G) B) and C)

Question 16

Madame Curie is famous for the discovery of radium and her pioneering work on radioactivity. The half-life of radium molar weight = 226g)  is 1600 years. What is the decay rate in curies)  of 5.0g of radium?

Accepted Answer

A)   4.95 Ci
B)   1.83 × 1011 Ci
C)   0.512 Ci
D)   52.3 Ci
E)   3.59 × 1011 CiF) A) and D)
G) B) and C)

Question 17

A radioactive source has a half-life of 2 min. At time t = 0 it is placed near a detector and the counting rate is observed to be 3000 counts/s. The counting rate at t = 10 min will be

Accepted Answer

A)   1500 counts/s.
B)   750 counts/s.
C)   375 counts/s.
D)   188 counts/s.
E)   94 counts/s.F) A) and C)
G) C) and D)

Question 18

For most nuclei, the total binding energy is proportional to the number of nucleons. This leads to the conclusion that nuclear forces show the property of

Accepted Answer

A)   pairing.
B)   charge dependence.
C)   relativity.
D)   magnetism.
E)   None of these is correct.F) A) and D)
G) A) and C)

Question 19

At a particular time, a radioactive source A has a decay rate of 1.60 × 1011 Bq and a half-life of 15.0 d, and a second source B has a decay rate of 8.50 × 1011 Bq. Sources A and B have the same decay rate 45.0 d later. The half-life of B is

Accepted Answer

A)   0.19 d.
B)   8.3 d.
C)   2.8 d.
D)   5.4 d.
E)   28 d.F) None of the above
G) A) and C)

Question 20

After a star fuses most its hydrogen into helium, it begins to fuse the helium into carbon. The energy released in fusing helium nuclei α particles)  into carbon is approximately

Accepted Answer

A)   0.730 MeV.
B)   1.46 MeV.
C)   7.30 MeV.
D)   14.6 MeV.
E)   73.0 MeV.F) C) and D)
G) D) and E)

Exam 27: Nuclear Physics

A radioactive source has a half-life of 2 min. At time t = 0 it is placed near a detector and the counting rate is observed to be 3000 counts/s. The counting rate at t = 10 min will be

Correct Answer
verified

At a particular time, a radioactive source A has a decay rate of 1.60 × 10¹¹ Bq and a half-life of 15.0 d, and a second source B has a decay rate of 8.50 × 10¹¹ Bq. Sources A and B have the same decay rate 45.0 d later. The half-life of B is

Correct Answer
verified

A fusion reaction that is highly probable is The amount of fusion energy released in this reaction is approximately

Correct Answer
verified

Correct Answer
verified

The half-life of phosphorus-32 is 14.3 d. If you have 1.00 g of phosphorous-32 today, the amount remaining in 10 d will be approximately

Correct Answer
verified

Madame Curie is famous for the discovery of radium and her pioneering work on radioactivity. The half-life of radium molar weight = 226g) is 1600 years. What is the decay rate in curies) of 5.0g of radium?

Correct Answer
verified

Which of the following radioactive decay products has the largest electric charge?

Correct Answer
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Correct Answer
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The radius of the ⁶⁴Ni nucleus is approximately

Correct Answer
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Atoms of an element that have different atomic masses are called

Correct Answer
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The graph shows the number of undecayed atoms as a function of time. The half-life of this radioactive element is approximately

Correct Answer
verified

Two nuclides that are isotopes could lie on curve

Correct Answer
verified

For most nuclei, the total binding energy is proportional to the number of nucleons. This leads to the conclusion that nuclear forces show the property of

Correct Answer
verified

The nuclear radius of is approximately

Correct Answer
verified

The alpha particles from a naturally radioactive decay have a kinetic energy of 4.25 MeV. How close does an alpha particle come within a gold nucleus if the particle is heading directly toward the nucleus? Give your answer in terms of number of radii of the gold atom, r = 7.0 fm.

Correct Answer
verified

The half-life of a radioactive substance is 5 min. Which of the following statements is true of the decay of this substance?

Correct Answer
verified

A radioactive nucleus with Z = 92 and A = 235 decays through a series of alpha, beta, and gamma emissions to a stable nucleus with Z = 82 and A = 207. The number of alpha particles and the number of beta particles emitted during the entire process are

Correct Answer
verified

After a star fuses most its hydrogen into helium, it begins to fuse the helium into carbon. The energy released in fusing helium nuclei α particles) into carbon is approximately

Correct Answer
verified

One way to think about the low binding energy E_b) per nucleon for low A numbers is

Correct Answer
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In what type of radioactive decay are the mass numbers of the parent and daughter nuclei the same?

Correct Answer
verified

Exam 27: Nuclear Physics

A radioactive source has a half-life of 2 min. At time t = 0 it is placed near a detector and the counting rate is observed to be 3000 counts/s. The counting rate at t = 10 min will be

Correct AnswerverifiedShow Answer

At a particular time, a radioactive source A has a decay rate of 1.60 × 1011 Bq and a half-life of 15.0 d, and a second source B has a decay rate of 8.50 × 1011 Bq. Sources A and B have the same decay rate 45.0 d later. The half-life of B is

Correct AnswerverifiedShow Answer

A fusion reaction that is highly probable is The amount of fusion energy released in this reaction is approximately

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The half-life of phosphorus-32 is 14.3 d. If you have 1.00 g of phosphorous-32 today, the amount remaining in 10 d will be approximately

Correct AnswerverifiedShow Answer

Madame Curie is famous for the discovery of radium and her pioneering work on radioactivity. The half-life of radium molar weight = 226g) is 1600 years. What is the decay rate in curies) of 5.0g of radium?

Correct AnswerverifiedShow Answer

Which of the following radioactive decay products has the largest electric charge?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The radius of the 64Ni nucleus is approximately

Correct AnswerverifiedShow Answer

Atoms of an element that have different atomic masses are called

Correct AnswerverifiedShow Answer

The graph shows the number of undecayed atoms as a function of time. The half-life of this radioactive element is approximately

Correct AnswerverifiedShow Answer

Two nuclides that are isotopes could lie on curve

Correct AnswerverifiedShow Answer

For most nuclei, the total binding energy is proportional to the number of nucleons. This leads to the conclusion that nuclear forces show the property of

Correct AnswerverifiedShow Answer

The nuclear radius of is approximately

Correct AnswerverifiedShow Answer

The alpha particles from a naturally radioactive decay have a kinetic energy of 4.25 MeV. How close does an alpha particle come within a gold nucleus if the particle is heading directly toward the nucleus? Give your answer in terms of number of radii of the gold atom, r = 7.0 fm.

Correct AnswerverifiedShow Answer

The half-life of a radioactive substance is 5 min. Which of the following statements is true of the decay of this substance?

Correct AnswerverifiedShow Answer

A radioactive nucleus with Z = 92 and A = 235 decays through a series of alpha, beta, and gamma emissions to a stable nucleus with Z = 82 and A = 207. The number of alpha particles and the number of beta particles emitted during the entire process are

Correct AnswerverifiedShow Answer

After a star fuses most its hydrogen into helium, it begins to fuse the helium into carbon. The energy released in fusing helium nuclei α particles) into carbon is approximately

Correct AnswerverifiedShow Answer

One way to think about the low binding energy Eb) per nucleon for low A numbers is

Correct AnswerverifiedShow Answer

In what type of radioactive decay are the mass numbers of the parent and daughter nuclei the same?

Correct AnswerverifiedShow Answer

Correct Answer
verified

At a particular time, a radioactive source A has a decay rate of 1.60 × 10¹¹ Bq and a half-life of 15.0 d, and a second source B has a decay rate of 8.50 × 10¹¹ Bq. Sources A and B have the same decay rate 45.0 d later. The half-life of B is

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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The radius of the ⁶⁴Ni nucleus is approximately

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
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Correct Answer
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Correct Answer
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Correct Answer
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One way to think about the low binding energy E_b) per nucleon for low A numbers is

Correct Answer
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Correct Answer
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