Calculate the amount of energy that is released in the fusion reaction 2H + 2H → 4He, given the masses: 2H: 2.014102 u 4He: 4.002603 u (1 u = 931.5 MeV/c2)

A) 24 MeV B) 18 MeV C) 13 MeV D) 12 MeV E) 36 MeV A) 24 MeV B) 18 MeV C) 13 MeV D) 12 MeV E) 36 MeV A

The decay rate of an isotope is initially R0, but after one half-life has gone by, the rate is R0/2. At the end of the NEXT half-life, what will the decay rate be?

A) 0 B) R0/16 C) R0/e D) R0/4 E) R0/e2 A) 0 B) R0/16 C) R0/e D) R0/4 E) R0/e2

How much energy is released when 1.40 μg of 3H have decayed to 3He? The mass of 3He is 3.016029 u, the mass of 3H is 3.016049 u, and 1 u = 931.494 MeV/c2.

A) 830 J B) 11,900 J C) 7970 J D) 71,700 J E) 23,900 J A) 830 J B) 11,900 J C) 7970 J D) 71,700 J E) 23,900 J

Exam 42: Nuclear Physics

An ancient rock is found to contain ⁴⁰Ar gas, indicating that 77% of the ⁴⁰K in the rock has decayed since the rock solidified. Any argon would have boiled out of liquid rock. The half-life of 40K is 1.25 billion years. How long ago did the rock solidify?

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Question 1

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Calculate the amount of energy that is released in the fusion reaction ²H + ²H → ⁴He, given the masses: ²H: 2.014102 u ⁴He: 4.002603 u (1 u = 931.5 MeV/c²)

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Question 2

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If a nucleus decays by β⁺ decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)

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Question 3

Correct Answer:

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B, C, D

A 57-kg researcher absorbs 6.3 × 10⁸ neutrons in a workday. The energy of the neutrons is 2.6 MeV. The relative biological efficiency (RBE) for fast neutrons is 10. What is the equivalent dosage of the radiation exposure, in mrem, of this worker?

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Question 4

Two deuterium nuclei, H, fuse to produce a tritium nucleus, H, and a hydrogen nucleus. A neutral deuterium atom has a mass of 2.014102 u; a neutral tritium atom has a mass of 3.016049 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 1.007276 u. How much energy is released in the process? (1 u = 931.494 MeV/c²)

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Question 5

How many days are required for a radioactive sample, with a half-life of 5.7 d and an initial activity of 1.07 × 10⁵ Bq, to decay to an activity of 100 Bq?

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Question 6

Plutonium-239 decays into uranium-235 plus an alpha particle. The energy released in the process is 5.24 MeV. Given the following mass values He: 4.002603 u U: 235.043924 u What is the mass of Pu in atomic mass units? (1 u = 931.494 MeV/c²)

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Question 7

The primary source of the energy radiated by a star, such as the sun, is

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Question 8

The decay rate of an isotope is initially R₀, but after one half-life has gone by, the rate is R₀/2. At the end of the NEXT half-life, what will the decay rate be?

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Question 9

What would be the expected radius of the nucleus of Sr?

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Question 10

The reaction energy (Q value) for a particular reaction is -2.4 MeV, and the reaction's threshold energy is 9.60 MeV. What is the ratio of the mass of the incident particle to the mass of the stationary target nucleus?

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Question 11

The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. Suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity (number of decays per second). What is true about the initial numbers of cobalt-60 and strontium-90 nuclei in these samples?

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Question 12

A radioactive isotope decays by β^- emission with a half-life of 1.0 min. During the first 1.0 min, a particular sample emits 1000 β^- particles. During the next 1.0 min, the number of β^- particles this sample will emit will be closest to

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Question 13

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

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Question 14

Modern nuclear bomb tests have created an extra high level of 14C in our atmosphere. Suppose that future archaeologists date samples from our era, but do not know about this testing. Will their dates be too young, too old, or still correct? If correct they are correct, why?

(Multiple Choice)

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Question 15

The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. Suppose you have a sample of each, such that they initially contain equal numbers of atoms of these nuclides. How will the activities (number of decays per second) of the samples compare?

(Multiple Choice)

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Question 16

When a neutron (n) collides with a uranium-235 nucleus it can induce a variety of fission reactions. One such reaction is U + n → Xe + Sr + 2n. How much energy is released in this reaction, given the following mass values: Xe: 139.921620 u Sr : 93.915367 u U: 235.043924 u N: 1.008665 u (1 u = 931.494 MeV/c²)

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Question 17

An isotope of Tc having a half-life of 6.0 h is used in bone scans. If a certain amount of this Tc is injected into the body, how long does it take for its initial decay rate to decrease BY 99%?

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Question 18

The detonation of a certain nuclear device results in a mass decrease of 2.60 g between the initial and the final ingredients. How much energy is released by this detonation? (c = 3.00 x 10⁸ m/s)

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Question 19

How much energy is released when 1.40 μg of ³H have decayed to ³He? The mass of ³He is 3.016029 u, the mass of ³H is 3.016049 u, and 1 u = 931.494 MeV/c².

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Question 20

Showing 1 - 20 of 89

Exam 42: Nuclear Physics

An ancient rock is found to contain 40Ar gas, indicating that 77% of the 40K in the rock has decayed since the rock solidified. Any argon would have boiled out of liquid rock. The half-life of 40K is 1.25 billion years. How long ago did the rock solidify?

Calculate the amount of energy that is released in the fusion reaction 2H + 2H → 4He, given the masses: 2H: 2.014102 u 4He: 4.002603 u (1 u = 931.5 MeV/c2)

If a nucleus decays by β+ decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)

A 57-kg researcher absorbs 6.3 × 108 neutrons in a workday. The energy of the neutrons is 2.6 MeV. The relative biological efficiency (RBE) for fast neutrons is 10. What is the equivalent dosage of the radiation exposure, in mrem, of this worker?

How many days are required for a radioactive sample, with a half-life of 5.7 d and an initial activity of 1.07 × 105 Bq, to decay to an activity of 100 Bq?

Plutonium-239 decays into uranium-235 plus an alpha particle. The energy released in the process is 5.24 MeV. Given the following mass values He: 4.002603 u U: 235.043924 u What is the mass of Pu in atomic mass units? (1 u = 931.494 MeV/c2)

The primary source of the energy radiated by a star, such as the sun, is

The decay rate of an isotope is initially R0, but after one half-life has gone by, the rate is R0/2. At the end of the NEXT half-life, what will the decay rate be?

What would be the expected radius of the nucleus of Sr?

The reaction energy (Q value) for a particular reaction is -2.4 MeV, and the reaction's threshold energy is 9.60 MeV. What is the ratio of the mass of the incident particle to the mass of the stationary target nucleus?

A radioactive isotope decays by β- emission with a half-life of 1.0 min. During the first 1.0 min, a particular sample emits 1000 β- particles. During the next 1.0 min, the number of β- particles this sample will emit will be closest to

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

Modern nuclear bomb tests have created an extra high level of 14C in our atmosphere. Suppose that future archaeologists date samples from our era, but do not know about this testing. Will their dates be too young, too old, or still correct? If correct they are correct, why?

The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. Suppose you have a sample of each, such that they initially contain equal numbers of atoms of these nuclides. How will the activities (number of decays per second) of the samples compare?

An isotope of Tc having a half-life of 6.0 h is used in bone scans. If a certain amount of this Tc is injected into the body, how long does it take for its initial decay rate to decrease BY 99%?

The detonation of a certain nuclear device results in a mass decrease of 2.60 g between the initial and the final ingredients. How much energy is released by this detonation? (c = 3.00 x 108 m/s)

How much energy is released when 1.40 μg of 3H have decayed to 3He? The mass of 3He is 3.016029 u, the mass of 3H is 3.016049 u, and 1 u = 931.494 MeV/c2.

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An ancient rock is found to contain ⁴⁰Ar gas, indicating that 77% of the ⁴⁰K in the rock has decayed since the rock solidified. Any argon would have boiled out of liquid rock. The half-life of 40K is 1.25 billion years. How long ago did the rock solidify?

Calculate the amount of energy that is released in the fusion reaction ²H + ²H → ⁴He, given the masses: ²H: 2.014102 u ⁴He: 4.002603 u (1 u = 931.5 MeV/c²)

If a nucleus decays by β⁺ decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)

A 57-kg researcher absorbs 6.3 × 10⁸ neutrons in a workday. The energy of the neutrons is 2.6 MeV. The relative biological efficiency (RBE) for fast neutrons is 10. What is the equivalent dosage of the radiation exposure, in mrem, of this worker?

How many days are required for a radioactive sample, with a half-life of 5.7 d and an initial activity of 1.07 × 10⁵ Bq, to decay to an activity of 100 Bq?

Plutonium-239 decays into uranium-235 plus an alpha particle. The energy released in the process is 5.24 MeV. Given the following mass values He: 4.002603 u U: 235.043924 u What is the mass of Pu in atomic mass units? (1 u = 931.494 MeV/c²)

The decay rate of an isotope is initially R₀, but after one half-life has gone by, the rate is R₀/2. At the end of the NEXT half-life, what will the decay rate be?

A radioactive isotope decays by β^- emission with a half-life of 1.0 min. During the first 1.0 min, a particular sample emits 1000 β^- particles. During the next 1.0 min, the number of β^- particles this sample will emit will be closest to

The detonation of a certain nuclear device results in a mass decrease of 2.60 g between the initial and the final ingredients. How much energy is released by this detonation? (c = 3.00 x 10⁸ m/s)

How much energy is released when 1.40 μg of ³H have decayed to ³He? The mass of ³He is 3.016029 u, the mass of ³H is 3.016049 u, and 1 u = 931.494 MeV/c².