Question 1

The primary reason that very large nuclei are unstable is due to

Accepted Answer

A)   the cumulative repulsive force of the protons.
B)   the cumulative attractive force between the protons and the orbiting electrons.
C)   the repulsive force between the neutrons and the protons.
D)   the extreme weakness of the gravitational attraction of the protons.E) A) and B)
F) A) and C)

Question 2

What is true of an element of atomic number 15 that has an isotope of mass number 32? (There could be more than one correct choice.)

Accepted Answer

A)   the number of protons in the nucleus is 15.
B)   the number of neutrons in the nucleus is 15.
C)   the number of protons in the nucleus is 32.
D)   the number of nucleons in the nucleus is 47.
E)   the number of neutrons in the nucleus is 17.F) B) and E)
G) A) and B)

Question 3

A fusion reaction releases energy because the binding energy of the resulting nucleus

Accepted Answer

A)   is greater than the binding energy of the original nuclei.
B)   is equal to the binding energy of the original nuclei.
C)   is less than the binding energy of the original nuclei.
D)   is released in the process.
E)   is absorbed in the process.F) C) and D)
G) A) and C)

Question 4

The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the half-life of this sample?

Accepted Answer

The answer of The decay rate of a radioactive sample...

Question 5

The radioactivity due to carbon-14 measured in a piece of a wooden casket from an ancient burial site is found to produce 20 counts per minute from a given sample, whereas the same amount of carbon from a piece of living wood produces 160 counts per minute. The half-life of carbon-14, a beta-minus emitter, is 5730 years. What would we calculate for the age of the artifact, assuming that the activity for living wood has remained constant over time?

Accepted Answer

A)   5,700 years
B)   11,500 years
C)   14,800 years
D)   17,200 years
E)   23,000 yearsF) A) and E)
G) A) and D)

Question 6

The proton is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom) ?

Accepted Answer

A)   uud
B)   ddu
C)   udd
D)   ttb
E)   bstF) B) and E)
G) B) and D)

Question 7

What happens to the half-life of a radioactive substance as it decays?

Accepted Answer

A)   It remains constant.
B)   It increases.
C)   It decreases at a constant rate.
D)   It decreases at an exponential rate.E) A) and C)
F) B) and D)

Question 8

Name the first three isotopes of hydrogen, write their symbols in standard notation, and indicate which one is the most common and which one is the most unstable.

Accepted Answer

H is ordinary hydrogen,

H is de...

Question 9

An oxygen-15 nucleus,   815^{15}_{8}815​ O, decays to another atomic nucleus by emitting a β+ ray. What is the other atomic nucleus?

Accepted Answer

A)    715^{15}_{7}715​  N
B)    816^{16}_{8}816​ F
C)    615^{15}_{6}615​  C
D)    814^{14}_{8}814​  C
E)    717^{17}_{7}717​ N F) All of the above
G) A) and D)

Question 10

When a stationary plutonium-239 nucleus decays into a uranium-235 nucleus plus an alpha particle, the energy released in the process is 5.24 MeV. The following masses are known:  24^{4}_{2}24​ He: 4.002603 u 92235^{235}_{92}92235​ U: 235.043924 u What is the kinetic energy of the 92235^{235}_{92}92235​  U nucleus? (1 u = 931.5 MeV/c2)

Accepted Answer

A)   0.0829 MeV
B)   0.0837 MeV
C)   0.0852 MeV
D)   0.0863 MeV
E)   0.0877 MeV F) A) and C)
G) B) and D)

Question 11

The atom 40K decays radioactively to the gas 40Ar. An ancient rock is found to contain enough 40Ar gas to indicate that 77.0% of the 40K in the rock has decayed to 40Ar since the rock solidified. (Any previous argon would have boiled out of liquid rock.)  How long ago did the rock solidify? The half-life of 40K is 1.25 billion years.

Accepted Answer

A)   2.65 billion years
B)   0.471 billion years
C)   1.80 billion years
D)   0.324 billion yearsE) A) and D)
F) B) and C)

Question 12

Leptons can interact by which of the following forces?

Accepted Answer

A)   strong nuclear force, weak nuclear force, electromagnetic force, gravitation
B)   strong nuclear force, weak nuclear force, electromagnetic force
C)   weak nuclear force, electromagnetic force, gravitation
D)   strong nuclear force, weak nuclear force
E)   strong nuclear force, electromagnetic force, gravitationF) A) and E)
G) A) and D)

Question 13

Bismuth  83212 ^{212}_{83} 83212​  Bi is known to be radioactive. The stability of  212ˆ83\^{212} _{83}212ˆ83​  Bi with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:  24^{4}_{2} 24​  He: 4.002603 u  81208^{208} _{81} 81208​  Tl: 207.981998 u  82212^{212} _{82}82212​  Pb: 211.991871 u  83212^{212}_{83} 83212​ Bi: 211.991255 u  84212Po^{212}_{84} Po84212​Po : 211.988842 u The  83212Bi^{212}_{83} Bi83212​Bi  nucleus is

Accepted Answer

A)   subject to alpha decay only.
B)   subject to beta-plus decay only.
C)   subject to beta-minus decay only.
D)   subject to alpha or beta-plus decay, but not beta-minus decay.
E)   subject to alpha or beta-minus decay, but not beta-plus decay. F) A) and B)
G) B) and E)

Question 14

In positron decay, the number of protons in the nucleus is

Accepted Answer

A)   decreased by 1.
B)   decreased by 2.
C)   increased by 1.
D)   increased by 2.
E)   remains unchanged.F) C) and D)
G) B) and D)

Question 15

Inside the nucleus, the weakest of the four fundamental forces is

Accepted Answer

A)   the weak nuclear force.
B)   the electromagnetic force.
C)   the gravitational force.
D)   the strong nuclear force.E) All of the above
F) B) and C)

Question 16

Determine the missing product X in the following nuclear reaction: 
$^{13}
_{7}
 $N + neutron → X + alpha particle

Accepted Answer

The answer of Determine the missing product X in the...

Question 17

Which of the following particles are not made up of quarks? (There could be more than one correct choice.)

Accepted Answer

A)   alpha particle
B)   electron
C)   proton
D)   positron
E)   neutronF) A) and D)
G) B) and D)

Question 18

In β- decay, the number of neutrons in the nucleus is

Accepted Answer

A)   decreased by 1.
B)   decreased by 2.
C)   increased by 1.
D)   increased by 2.
E)   remains unchanged.F) None of the above
G) C) and D)

Question 19

In a  4193^{93}_{41}4193​ Nb nucleus, how many protons, neutrons, and electrons are found there?

Accepted Answer

A)   41, 52, 93.
B)   41, 52, 41.
C)   52, 41, 41.
D)   41, 52, 0.
E)   93, 41, 93. F) A) and E)
G) C) and D)

Question 20

The radius R of a nucleus of mass number A is given by R = R0 A1/3, where R0 = 1.2 × 10-15 m, calculate the density of a nucleus that has contains 57 protons and 82 neutrons. The mass of a nucleon (proton or neutron) is 1.67 × 10-27 kg.

Accepted Answer

Exam 30: Nuclear Physics

What is true of an element of atomic number 15 that has an isotope of mass number 32? (There could be more than one correct choice.)

Correct Answer
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Name the first three isotopes of hydrogen, write their symbols in standard notation, and indicate which one is the most common and which one is the most unstable.

Correct Answer
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H is ordinary hydrogen,H is de...
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Which of the following particles are not made up of quarks? (There could be more than one correct choice.)

Correct Answer
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The primary reason that very large nuclei are unstable is due to

Correct Answer
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Correct Answer
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A fusion reaction releases energy because the binding energy of the resulting nucleus

Correct Answer
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The radius R of a nucleus of mass number A is given by R = R₀ A^1/3, where R₀ = 1.2 × 10^-15 m, calculate the density of a nucleus that has contains 57 protons and 82 neutrons. The mass of a nucleon (proton or neutron) is 1.67 × 10^-27 kg.

Correct Answer
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In a $^{93}_{41}$ Nb nucleus, how many protons, neutrons, and electrons are found there?

Correct Answer
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The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the half-life of this sample?

Correct Answer
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Correct Answer
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Correct Answer
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An oxygen-15 nucleus, $^{15}_{8}$ O, decays to another atomic nucleus by emitting a β⁺ ray. What is the other atomic nucleus?

Correct Answer
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What happens to the half-life of a radioactive substance as it decays?

Correct Answer
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Inside the nucleus, the weakest of the four fundamental forces is

Correct Answer
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Leptons can interact by which of the following forces?

Correct Answer
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The proton is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom) ?

Correct Answer
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Correct Answer
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In positron decay, the number of protons in the nucleus is

Correct Answer
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In β^- decay, the number of neutrons in the nucleus is

Correct Answer
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Determine the missing product X in the following nuclear reaction: $^{13}_{7}$ N + neutron → X + alpha particle

Correct Answer
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Exam 30: Nuclear Physics

What is true of an element of atomic number 15 that has an isotope of mass number 32? (There could be more than one correct choice.)

Correct AnswerverifiedShow Answer

Name the first three isotopes of hydrogen, write their symbols in standard notation, and indicate which one is the most common and which one is the most unstable.

Correct AnswerverifiedH is ordinary hydrogen,H is de...View AnswerShow Answer

Which of the following particles are not made up of quarks? (There could be more than one correct choice.)

Correct AnswerverifiedShow Answer

The primary reason that very large nuclei are unstable is due to

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A fusion reaction releases energy because the binding energy of the resulting nucleus

Correct AnswerverifiedShow Answer

The radius R of a nucleus of mass number A is given by R = R0 A1/3, where R0 = 1.2 × 10-15 m, calculate the density of a nucleus that has contains 57 protons and 82 neutrons. The mass of a nucleon (proton or neutron) is 1.67 × 10-27 kg.

Correct AnswerverifiedShow Answer

In a 4193^{93}_{41}4193​ Nb nucleus, how many protons, neutrons, and electrons are found there?

Correct AnswerverifiedShow Answer

The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the half-life of this sample?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An oxygen-15 nucleus, 815^{15}_{8}815​ O, decays to another atomic nucleus by emitting a β+ ray. What is the other atomic nucleus?

Correct AnswerverifiedShow Answer

What happens to the half-life of a radioactive substance as it decays?

Correct AnswerverifiedShow Answer

Inside the nucleus, the weakest of the four fundamental forces is

Correct AnswerverifiedShow Answer

Leptons can interact by which of the following forces?

Correct AnswerverifiedShow Answer

The proton is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom) ?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In positron decay, the number of protons in the nucleus is

Correct AnswerverifiedShow Answer

In β- decay, the number of neutrons in the nucleus is

Correct AnswerverifiedShow Answer

Determine the missing product X in the following nuclear reaction: 713^{13}_{7} 713​ N + neutron → X + alpha particle

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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H is ordinary hydrogen,H is de...
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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The radius R of a nucleus of mass number A is given by R = R₀ A^1/3, where R₀ = 1.2 × 10^-15 m, calculate the density of a nucleus that has contains 57 protons and 82 neutrons. The mass of a nucleon (proton or neutron) is 1.67 × 10^-27 kg.

Correct Answer
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In a $^{93}_{41}$ Nb nucleus, how many protons, neutrons, and electrons are found there?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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An oxygen-15 nucleus, $^{15}_{8}$ O, decays to another atomic nucleus by emitting a β⁺ ray. What is the other atomic nucleus?

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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In β^- decay, the number of neutrons in the nucleus is

Correct Answer
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Determine the missing product X in the following nuclear reaction: $^{13}_{7}$ N + neutron → X + alpha particle

Correct Answer
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