When an alpha particle (4He) with a kinetic energy of 6.54 MeV strikes a 27Al nucleus, a 30P nucleus is created and a neutron is ejected. Assume that the 30P nucleus has no final kinetic energy. Given the following masses for the various particles, what is the kinetic energy of the ejected neutron?

A) 3.71 MeV B) 2.83 MeV C) 6.54 MeV D) 9.37 MeV E) 0.45 MeV A) 3.71 MeV B) 2.83 MeV C) 6.54 MeV D) 9.37 MeV E) 0.45 MeV A

An old piece of dead wood contains 38% of the 14C abundance of a living sample. How old is it? (The half-life of 14C is 5730 years.)

A) 3.95 * 103 years B) 8.78 * 103 years C) 8.00 * 103 years D) 7.66 * 103 years E) 3.47 * 103 years A) 3.95 * 103 years B) 8.78 * 103 years C) 8.00 * 103 years D) 7.66 * 103 years E) 3.47 * 103 years

Exam 20: Nuclear Physics

When an alpha particle (⁴He) with a kinetic energy of 6.54 MeV strikes a ²⁷Al nucleus, a ³⁰P nucleus is created and a neutron is ejected. Assume that the ³⁰P nucleus has no final kinetic energy. Given the following masses for the various particles, what is the kinetic energy of the ejected neutron?

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Question 1

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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.)

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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

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The graph shows the neutron-capture cross section for indium as a function of neutron energy. Which of the following statements can be deduced from the graph?

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Question 4

A moderator is used to slow

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Question 5

A radioactive substance in the laboratory has a half-life of 8 h. At noon today, a Geiger counter reads 480 counts/min above background. At noon tomorrow, the counter should read about

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Question 6

A $\beta$ particle is an energetic

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Question 7

A sample of $A sample of (which decays by \beta -emission) has an activity of 10.0 mCi. After 6)06 d it has an activity of 7.5 mCi. The half-life of 32P is approximately$ (which decays by $\beta$ -emission) has an activity of 10.0 mCi. After 6)06 d it has an activity of 7.5 mCi. The half-life of ³²P is approximately

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Question 8

The "third-life," the time it takes nuclei to decay until one-third of the original amount remains, expressed in terms of the decay constant $\lambda$ , is

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Question 9

The Federal Aviation Administration limits the number of hours flight crews can be at high altitudes, $\backsim$ 10,000 m. One of the reasons is because

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Question 10

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 activity (in Curie's) of 5.0g of radium?

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Question 11

A radioactive sample is detected to produce 2500 decays per minute at 6:00 p.m. and 150 decays per minute at 11:00 p.m. the same day. What is the half-life of the sample?

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Question 12

An old piece of dead wood contains 38% of the ¹⁴C abundance of a living sample. How old is it? (The half-life of ¹⁴C is 5730 years.)

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Question 13

Neutrons are effective particles for penetrating the nucleus because of their

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Question 14

Why is the ratio of neutrons to protons greater in the heavier elements?

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Question 15

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. If the detection efficiency is 25%, how many radioactive nuclei are there at time t = 0?

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Question 16

What are the numbers of protons Z and neutrons N in the missing fragment of the following fission reaction?

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Question 17

The nuclear radius of is approximately

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Question 18

The intensity of gamma rays passing through a material as a function of thickness, x is given by $The intensity of gamma rays passing through a material as a function of thickness, x is given by where n is the number of atoms per cm3 and \sigma is the absorption cross section. If the intensity of gamma rays of a particular energy is reduced by half when they passed through 1 cm of lead, what is the absorption cross section for the gamma rays? The density of lead is 11.3 g/cm3 and its molar mass is 207 g.$ where n is the number of atoms per cm³ and $\sigma$ is the absorption cross section. If the intensity of gamma rays of a particular energy is reduced by half when they passed through 1 cm of lead, what is the absorption cross section for the gamma rays? The density of lead is 11.3 g/cm³ and its molar mass is 207 g.

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Question 19

The fact that most $\alpha$ emitters show a group of discrete $\alpha$ -particle energies, rather than a single energy, can best be explained by which of the following?

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Question 20

Showing 1 - 20 of 135

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

The graph shows the neutron-capture cross section for indium as a function of neutron energy. Which of the following statements can be deduced from the graph?

A moderator is used to slow

A radioactive substance in the laboratory has a half-life of 8 h. At noon today, a Geiger counter reads 480 counts/min above background. At noon tomorrow, the counter should read about

A $\beta$ particle is an energetic

The "third-life," the time it takes nuclei to decay until one-third of the original amount remains, expressed in terms of the decay constant $\lambda$ , is

The Federal Aviation Administration limits the number of hours flight crews can be at high altitudes, $\backsim$ 10,000 m. One of the reasons is because

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 activity (in Curie's) of 5.0g of radium?

A radioactive sample is detected to produce 2500 decays per minute at 6:00 p.m. and 150 decays per minute at 11:00 p.m. the same day. What is the half-life of the sample?

An old piece of dead wood contains 38% of the ¹⁴C abundance of a living sample. How old is it? (The half-life of ¹⁴C is 5730 years.)

Neutrons are effective particles for penetrating the nucleus because of their

Why is the ratio of neutrons to protons greater in the heavier elements?

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. If the detection efficiency is 25%, how many radioactive nuclei are there at time t = 0?

What are the numbers of protons Z and neutrons N in the missing fragment of the following fission reaction?

The nuclear radius of is approximately

The fact that most $\alpha$ emitters show a group of discrete $\alpha$ -particle energies, rather than a single energy, can best be explained by which of the following?

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Elementary Particles and the Beginning of the Universe

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Exam 20: Nuclear Physics

When an alpha particle (4He) with a kinetic energy of 6.54 MeV strikes a 27Al nucleus, a 30P nucleus is created and a neutron is ejected. Assume that the 30P nucleus has no final kinetic energy. Given the following masses for the various particles, what is the kinetic energy of the ejected neutron?

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

The graph shows the neutron-capture cross section for indium as a function of neutron energy. Which of the following statements can be deduced from the graph?

A moderator is used to slow

A radioactive substance in the laboratory has a half-life of 8 h. At noon today, a Geiger counter reads 480 counts/min above background. At noon tomorrow, the counter should read about

A β\betaβ particle is an energetic

A sample of (which decays by β\betaβ -emission) has an activity of 10.0 mCi. After 6)06 d it has an activity of 7.5 mCi. The half-life of 32P is approximately

The "third-life," the time it takes nuclei to decay until one-third of the original amount remains, expressed in terms of the decay constant λ\lambdaλ , is

The Federal Aviation Administration limits the number of hours flight crews can be at high altitudes, ∽\backsim∽ 10,000 m. One of the reasons is because

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 activity (in Curie's) of 5.0g of radium?

A radioactive sample is detected to produce 2500 decays per minute at 6:00 p.m. and 150 decays per minute at 11:00 p.m. the same day. What is the half-life of the sample?

An old piece of dead wood contains 38% of the 14C abundance of a living sample. How old is it? (The half-life of 14C is 5730 years.)

Neutrons are effective particles for penetrating the nucleus because of their

Why is the ratio of neutrons to protons greater in the heavier elements?

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. If the detection efficiency is 25%, how many radioactive nuclei are there at time t = 0?

What are the numbers of protons Z and neutrons N in the missing fragment of the following fission reaction?

The nuclear radius of is approximately

The fact that most α\alphaα emitters show a group of discrete α\alphaα -particle energies, rather than a single energy, can best be explained by which of the following?

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Elementary Particles and the Beginning of the Universe

Filters

A $\beta$ particle is an energetic

The "third-life," the time it takes nuclei to decay until one-third of the original amount remains, expressed in terms of the decay constant $\lambda$ , is

The Federal Aviation Administration limits the number of hours flight crews can be at high altitudes, $\backsim$ 10,000 m. One of the reasons is because

An old piece of dead wood contains 38% of the ¹⁴C abundance of a living sample. How old is it? (The half-life of ¹⁴C is 5730 years.)

The fact that most $\alpha$ emitters show a group of discrete $\alpha$ -particle energies, rather than a single energy, can best be explained by which of the following?