If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction? (1 eV = 1.60 × 10-19 J, mneutron ≈ mproton = 1.67 × 10-27 kg)

A) 0.35 kg B) 1.75 kg C) 390 kg D) 1.1 × 108 kg E) 3.3 × 108 kg A) 0.35 kg B) 1.75 kg C) 390 kg D) 1.1 × 108 kg E) 3.3 × 108 kg

The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?

A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108 A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108

How long would it take 4.00 × 1020 atoms to decay to 1.00 × 1019 atoms if their half-life was 14.7 years?

A) 29.4 years B) 58.8 years C) 78.2 years D) 147 years A) 29.4 years B) 58.8 years C) 78.2 years D) 147 years

A) a neutron is transformed to a proton. B) a proton is transformed to a neutron. C) a neutron is ejected from the nucleus. D) a proton is ejected from the nucleus. E) the number of nucleons increases. A) a neutron is transformed to a proton. B) a proton is transformed to a neutron. C) a neutron is ejected from the nucleus. D) a proton is ejected from the nucleus. E) the number of nucleons increases.

Plutonium has a half life of 2.4 × 104 years. How long does it take for 99.0% of the plutonium to decay?

A) 1.6 × 102 y B) 1.6 × 103 y C) 1.6 × 104 y D) 1.6 × 105 y E) 1.6 × 106 y A) 1.6 × 102 y B) 1.6 × 103 y C) 1.6 × 104 y D) 1.6 × 105 y E) 1.6 × 106 y

Exam 30: Nuclear Physics

A hypothetical particle has a mass of 510 MeV/c². If such a particle at rest decays into two gamma-ray photons, what is the wavelength of each photon? (1 eV = 1.60 × 10^-19 J, c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J∙ s)

(Short Answer)

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Question 81

A hospital patient has been given a sample of ¹³¹I , which has a half-life of 8.04 days. This sample is decaying at 5.9 times the acceptable level for exposure to the general public. How long must the patient wait for the decay rate of the sample to reach the acceptable level?

(Multiple Choice)

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Question 82

What is the mass number of alpha particles?

(Multiple Choice)

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Question 83

The atomic number and mass number for calcium-39 are 20 and 39, respectively. How many neutrons are in one atom?

(Multiple Choice)

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Question 84

If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of ²³⁵U is used up for a 365-day year if 200 MeV are released per fission reaction? (1 eV = 1.60 × 10^-19 J, m_neutron ≈ m_proton = 1.67 × 10-27 kg)

(Multiple Choice)

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Question 85

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 contain equal numbers of atoms of these isotopes. How will the activities (number of decays per second) of the samples compare?

(Multiple Choice)

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Question 86

Modern in-air nuclear bomb tests have created an extra high level of ¹⁴C in our atmosphere. If future archaeologists date samples from this era, without knowing of this testing, will their carbon-14 dates be too young, too old, or correct? If correct, why?

(Multiple Choice)

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Question 87

Starting with $^{235}_{92}$ U, assume that the following three decays occur in sequence: (1) alpha decay (2) beta-minus decay (3) alpha decay Determine the correct isotope that is left after each decay.

(Short Answer)

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Question 88

When a β^- particle is emitted from an unstable nucleus, the atomic mass number of the nucleus

(Multiple Choice)

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Question 89

The main reason that there is a limit to the size of a stable nucleus is

(Multiple Choice)

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Question 90

What combination of quarks produces a proton and what are the electric charges on these quarks, expressed in terms of e?

(Short Answer)

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Question 91

The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 10⁸ radon atoms, how many of them are left after 10.0 d?

(Multiple Choice)

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Question 92

How long would it take 4.00 × 10²⁰ atoms to decay to 1.00 × 10¹⁹ atoms if their half-life was 14.7 years?

(Multiple Choice)

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Question 93

Consider the nuclear reaction $^{3}_{1} H + ^{3}_{1} H → ^{4}_{2} He + 2\^{1}_{0} n$ . The known atomic masses are $^{4}_{2} He: 4.002603 u\ ^{3}_{1} H: 3.016049u\ ^{1} _{0} n$ : 1.008665 u What is the energy released (positive) or absorbed (negative) in this nuclear reaction? (1 u = 931.5 MeV/c²)

(Multiple Choice)

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Question 94

During β^- decay

(Multiple Choice)

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Question 95

How many quarks are in a tritium isotope, $^{3}_{1}$ H?

(Multiple Choice)

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Question 96

Plutonium has a half life of 2.4 × 10⁴ years. How long does it take for 99.0% of the plutonium to decay?

(Multiple Choice)

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Question 97

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 $^{235}$ U (1 eV = 1.60 × 10^-19 J, m_neutron ≈ m_proton = 1.67 × 10-27 kg)

(Multiple Choice)

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Question 98

The atomic number of an atom is equal to the number of what particles in the nucleus?

(Multiple Choice)

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Question 99

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

(Multiple Choice)

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Question 100

Showing 81 - 100 of 175

Exam 30: Nuclear Physics

A hypothetical particle has a mass of 510 MeV/c2. If such a particle at rest decays into two gamma-ray photons, what is the wavelength of each photon? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J∙ s)

A hospital patient has been given a sample of 131I , which has a half-life of 8.04 days. This sample is decaying at 5.9 times the acceptable level for exposure to the general public. How long must the patient wait for the decay rate of the sample to reach the acceptable level?

What is the mass number of alpha particles?

The atomic number and mass number for calcium-39 are 20 and 39, respectively. How many neutrons are in one atom?

If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction? (1 eV = 1.60 × 10-19 J, mneutron ≈ mproton = 1.67 × 10-27 kg)

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 contain equal numbers of atoms of these isotopes. How will the activities (number of decays per second) of the samples compare?

Modern in-air nuclear bomb tests have created an extra high level of 14C in our atmosphere. If future archaeologists date samples from this era, without knowing of this testing, will their carbon-14 dates be too young, too old, or correct? If correct, why?

Starting with 92235^{235}_{92}92235​ U, assume that the following three decays occur in sequence: (1) alpha decay (2) beta-minus decay (3) alpha decay Determine the correct isotope that is left after each decay.

When a β- particle is emitted from an unstable nucleus, the atomic mass number of the nucleus

The main reason that there is a limit to the size of a stable nucleus is

What combination of quarks produces a proton and what are the electric charges on these quarks, expressed in terms of e?

The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?

How long would it take 4.00 × 1020 atoms to decay to 1.00 × 1019 atoms if their half-life was 14.7 years?

During β- decay

How many quarks are in a tritium isotope, 13^{3}_{1}13​ H?

Plutonium has a half life of 2.4 × 104 years. How long does it take for 99.0% of the plutonium to decay?

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 235^{235}235 U (1 eV = 1.60 × 10-19 J, mneutron ≈ mproton = 1.67 × 10-27 kg)

The atomic number of an atom is equal to the number of what particles in the nucleus?

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

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A hypothetical particle has a mass of 510 MeV/c². If such a particle at rest decays into two gamma-ray photons, what is the wavelength of each photon? (1 eV = 1.60 × 10^-19 J, c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J∙ s)

A hospital patient has been given a sample of ¹³¹I , which has a half-life of 8.04 days. This sample is decaying at 5.9 times the acceptable level for exposure to the general public. How long must the patient wait for the decay rate of the sample to reach the acceptable level?

If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of ²³⁵U is used up for a 365-day year if 200 MeV are released per fission reaction? (1 eV = 1.60 × 10^-19 J, m_neutron ≈ m_proton = 1.67 × 10-27 kg)

Modern in-air nuclear bomb tests have created an extra high level of ¹⁴C in our atmosphere. If future archaeologists date samples from this era, without knowing of this testing, will their carbon-14 dates be too young, too old, or correct? If correct, why?

Starting with $^{235}_{92}$ U, assume that the following three decays occur in sequence: (1) alpha decay (2) beta-minus decay (3) alpha decay Determine the correct isotope that is left after each decay.

When a β^- particle is emitted from an unstable nucleus, the atomic mass number of the nucleus

The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 10⁸ radon atoms, how many of them are left after 10.0 d?

How long would it take 4.00 × 10²⁰ atoms to decay to 1.00 × 10¹⁹ atoms if their half-life was 14.7 years?

During β^- decay

How many quarks are in a tritium isotope, $^{3}_{1}$ H?

Plutonium has a half life of 2.4 × 10⁴ years. How long does it take for 99.0% of the plutonium to decay?

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 $^{235}$ U (1 eV = 1.60 × 10^-19 J, m_neutron ≈ m_proton = 1.67 × 10-27 kg)