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.

A) 2.65 billion years B) 0.471 billion years C) 1.80 billion years D) 0.324 billion years A) 2.65 billion years B) 0.471 billion years C) 1.80 billion years D) 0.324 billion years

Fermium-253 has a half-life of 3.00 days.A sample of fermium has 3.88 × 106 nuclei.What is the initial activity of this sample?

A) 10.4 Bq B) 10.4 kBq C) 12.9 Bq D) 12.9 kBq A) 10.4 Bq B) 10.4 kBq C) 12.9 Bq D) 12.9 kBq

Exam 32: Nuclear Physics and Nuclear Radiation

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When ²³⁵U undergoes fission,the average energy per fission event is 200 MeV.How much energy is released in the total fission of 2.0g Of ²³⁵U (1 eV = 1.60 × 10^-19 J,m_neutron ≈ m_proton = 1.67 × 10-27 kg)

(Multiple Choice)

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Question 41

When an unstable nucleus decays by emitting an alpha particle,the atomic number Z of the nucleus

(Multiple Choice)

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Question 42

Which of the following particles are leptons? (There may be more than one correct choice. )

(Multiple Choice)

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Question 43

The half-life of cobalt-60 is 5.3 years,while that of strontium-90 is about 29 years.Suppose you have samples of both isotopes,and that they initially have the same activity (number of decays per second).What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples?

(Multiple Choice)

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Question 44

The symbol for a certain isotope of strontium is Sr.What is the mass number of this isotope?

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Question 45

The half-life of radioactive iodine-137 is 8.0 days.How many iodine nuclei are necessary to produce an activity of 1.0 μCi? (1 Ci = 3.70 × 10¹⁰ Bq)

(Multiple Choice)

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Question 46

Carbon-14 decays by β^- emission.What nucleus is left after this decay?

(Multiple Choice)

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Question 47

A radioactive isotope of atomic number Z emits a beta-minus particle,and then the daughter nucleus emits a gamma ray.What is the atomic number of the resulting nucleus after both processes?

(Multiple Choice)

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Question 48

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.

(Multiple Choice)

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Question 49

A stable nucleus contains many protons very close to each other,all positively charged.Why do the protons not fly apart due to mutual Coulomb repulsion?

(Multiple Choice)

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Question 50

What are the possible charges of a quark (not an antiquark)?

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Question 51

When an unstable nucleus decays by emitting an alpha particle,the atomic mass number A of the nucleus

(Multiple Choice)

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Question 52

Rubidium Rb is a naturally occurring isotope that undergoes β^- decay.What isotope is the product of this decay?

(Multiple Choice)

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Question 53

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

(Multiple Choice)

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Question 54

Fermium-253 has a half-life of 3.00 days.If a sample of fermium originally has 7.37 × Nuclei,how long will it take for there to be only 3.36 × Fermium-253 nuclei left in this sample?

(Multiple Choice)

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Question 55

The neutral Al atom has a mass of 26.981539 u;a neutral hydrogen atom has a mass of 1.007825 u;a neutron has a mass of 1.008665 u;and a proton has a mass of 1.007277 u.What is the binding energy per nucleon for Al? (1 u = 931.5 MeV/c²)

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Question 56

The symbol for a certain isotope of radium is Ra.How many nucleons are there in the nucleus of this isotope?

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Question 57

Fermium-253 has a half-life of 3.00 days.A sample of fermium has 3.88 × 10⁶ nuclei.What is the initial activity of this sample?

(Multiple Choice)

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Question 58

The equation shows a fission reaction: U + N → Nb + X + 4 N What is the missing term X in the equation?

(Multiple Choice)

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Question 59

Leptons can interact by which of the following forces?

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Question 60

Showing 41 - 60 of 137

Exam 32: Nuclear Physics and Nuclear Radiation

When 235U undergoes fission,the average energy per fission event is 200 MeV.How much energy is released in the total fission of 2.0g Of 235U (1 eV = 1.60 × 10-19 J,mneutron ≈ mproton = 1.67 × 10-27 kg)

When an unstable nucleus decays by emitting an alpha particle,the atomic number Z of the nucleus

Which of the following particles are leptons? (There may be more than one correct choice. )

The half-life of cobalt-60 is 5.3 years,while that of strontium-90 is about 29 years.Suppose you have samples of both isotopes,and that they initially have the same activity (number of decays per second).What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples?

The symbol for a certain isotope of strontium is Sr.What is the mass number of this isotope?

The half-life of radioactive iodine-137 is 8.0 days.How many iodine nuclei are necessary to produce an activity of 1.0 μCi? (1 Ci = 3.70 × 1010 Bq)

Carbon-14 decays by β- emission.What nucleus is left after this decay?

A radioactive isotope of atomic number Z emits a beta-minus particle,and then the daughter nucleus emits a gamma ray.What is the atomic number of the resulting nucleus after both processes?

A stable nucleus contains many protons very close to each other,all positively charged.Why do the protons not fly apart due to mutual Coulomb repulsion?

What are the possible charges of a quark (not an antiquark)?

When an unstable nucleus decays by emitting an alpha particle,the atomic mass number A of the nucleus

Rubidium Rb is a naturally occurring isotope that undergoes β- decay.What isotope is the product of this decay?

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

Fermium-253 has a half-life of 3.00 days.If a sample of fermium originally has 7.37 × Nuclei,how long will it take for there to be only 3.36 × Fermium-253 nuclei left in this sample?

The neutral Al atom has a mass of 26.981539 u;a neutral hydrogen atom has a mass of 1.007825 u;a neutron has a mass of 1.008665 u;and a proton has a mass of 1.007277 u.What is the binding energy per nucleon for Al? (1 u = 931.5 MeV/c2)

The symbol for a certain isotope of radium is Ra.How many nucleons are there in the nucleus of this isotope?

Fermium-253 has a half-life of 3.00 days.A sample of fermium has 3.88 × 106 nuclei.What is the initial activity of this sample?

The equation shows a fission reaction: U + N → Nb + X + 4 N What is the missing term X in the equation?

Leptons can interact by which of the following forces?

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When ²³⁵U undergoes fission,the average energy per fission event is 200 MeV.How much energy is released in the total fission of 2.0g Of ²³⁵U (1 eV = 1.60 × 10^-19 J,m_neutron ≈ m_proton = 1.67 × 10-27 kg)

The half-life of radioactive iodine-137 is 8.0 days.How many iodine nuclei are necessary to produce an activity of 1.0 μCi? (1 Ci = 3.70 × 10¹⁰ Bq)

Carbon-14 decays by β^- emission.What nucleus is left after this decay?

Rubidium Rb is a naturally occurring isotope that undergoes β^- decay.What isotope is the product of this decay?

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

The neutral Al atom has a mass of 26.981539 u;a neutral hydrogen atom has a mass of 1.007825 u;a neutron has a mass of 1.008665 u;and a proton has a mass of 1.007277 u.What is the binding energy per nucleon for Al? (1 u = 931.5 MeV/c²)

Fermium-253 has a half-life of 3.00 days.A sample of fermium has 3.88 × 10⁶ nuclei.What is the initial activity of this sample?