Question 1

A thermal neutron

Accepted Answer

A)  produces electrons by thermionic emission. 
B)  produces protons by thermionic emission. 
C)  ionizes atoms by an increase in thermal energy. 
D)  creates an electron-positron pair by an increase in thermal energy. 
E)  gains kinetic energy as often as it loses it at room temperature. 
A)  produces electrons by thermionic emission. 
B)  produces protons by thermionic emission. 
C)  ionizes atoms by an increase in thermal energy. 
D)  creates an electron-positron pair by an increase in thermal energy. 
E)  gains kinetic energy as often as it loses it at room temperature.

Question 2

A radiologist uses a radioactive isotope of iodine, 123I, for thyroid scans. She receives a shipment of 15 mCi of this isotope at noon on Tuesday. The half-life of this isotope is 13.2 h. How much activity remains at noon on Thursday of the same week?

Accepted Answer

A)  12 mCi 
B)  1.2 mCi 
C)  2.4 mCi 
D)  4.2 mCi 
E)  24 mCi 
A)  12 mCi 
B)  1.2 mCi 
C)  2.4 mCi 
D)  4.2 mCi 
E)  24 mCi

Question 3

Rutherford's experiments, in which he bombarded a very thin gold foil with alpha particles, showed that

Accepted Answer

A)  all of the $\alpha$ particles passed through the foil without significant deflection. 
B)  none of the $\alpha$ particles were able to penetrate the foil. 
C)  all of the $\alpha$ particles passed through the foil and were deflected through large angles. 
D)  most of the $\alpha$ particles passed through the foil with negligible deflection but some were deflected through large angles. 
E)  the $\alpha$ particles were linearly polarized after passing through the foil. 
A)  all of the $\alpha$ particles passed through the foil without significant deflection. 
B)  none of the $\alpha$ particles were able to penetrate the foil. 
C)  all of the $\alpha$ particles passed through the foil and were deflected through large angles. 
D)  most of the $\alpha$ particles passed through the foil with negligible deflection but some were deflected through large angles. 
E)  the $\alpha$ particles were linearly polarized after passing through the foil.

Question 4

The total binding energy of   is approximately

Accepted Answer

A)  8.00 MeV 
B)  56.0 MeV 
C)  39.2 MeV 
D)  37.6 MeV 
E)  22.4 MeV 
A)  8.00 MeV 
B)  56.0 MeV 
C)  39.2 MeV 
D)  37.6 MeV 
E)  22.4 MeV

Question 5

A barn is a unit of

Accepted Answer

A)  momentum 
B)  energy 
C)  range 
D)  cross section 
E)  impact parameter 
A)  momentum 
B)  energy 
C)  range 
D)  cross section 
E)  impact parameter

Question 6

The neutrino was introduced as a part of the theory of beta decay because

Accepted Answer

A)  the emitted beta particles are monoenergetic. 
B)  Mparent daughter + Mbeta. 
C)  there was an apparent violation of the conservation of energy, angular momentum, and linear momentum. 
D)  the disintegration energy is less than zero (Q < 0). 
E)  the conservation of charge and the conservation of nucleons are violated without the neutrino. 
A)  the emitted beta particles are monoenergetic. 
B)  Mparent daughter + Mbeta. 
C)  there was an apparent violation of the conservation of energy, angular momentum, and linear momentum. 
D)  the disintegration energy is less than zero (Q < 0). 
E)  the conservation of charge and the conservation of nucleons are violated without the neutrino.

Question 7

A thermal neutron is a neutron whose kinetic energy is in thermal equilibrium with its surroundings. At room temperature this energy is approximately

Accepted Answer

A)  0.025 eV 
B)  0.050 eV 
C)  0.50 eV 
D)  5 eV 
E)  50 eV 
A)  0.025 eV 
B)  0.050 eV 
C)  0.50 eV 
D)  5 eV 
E)  50 eV

Question 8

A nuclear proton is changed into a neutron when

Accepted Answer

A)  positrons are emitted. 
B)  positrons are absorbed. 
C)  electrons are emitted. 
D)  neutrons are absorbed. 
E)  protons are emitted. 
A)  positrons are emitted. 
B)  positrons are absorbed. 
C)  electrons are emitted. 
D)  neutrons are absorbed. 
E)  protons are emitted.

Question 9

If the radioactivity of thorium C decreases to one-half in 1 h, in another 60 min its activity, compared with that at the beginning of the first hour, will be

Accepted Answer

A)  1/4 
B)  zero 
C)  1/8 
D)  1/16 
E)  1/120 
A)  1/4 
B)  zero 
C)  1/8 
D)  1/16 
E)  1/120

Question 10

The fact that the binding energy per nucleon is roughly a constant over most of the range of stable nuclei indicates that the nuclear force is

Accepted Answer

A)  short range. 
B)  long range. 
C)  weak. 
D)  strong. 
E)  repulsive. 
A)  short range. 
B)  long range. 
C)  weak. 
D)  strong. 
E)  repulsive.

Question 11

The solid line represents stable nuclei. A nucleus with an excess of protons and a tendency to decay with alpha particle emission is located at

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 12

One way to think about the low binding energy per nucleon for low A numbers is

Accepted Answer

A)  that there are few protons, hence there is less electrostatic repulsion. 
B)  that there are few electrons to provide the electrostatic attraction. 
C)  at low A the number of nearest neighbors per nucleon is small compared to higher a
A numbers. 
D)  at low A, the nucleus is less spherical, hence there is less surface tension. 
E)  None of the above statements is correct. 
A)  that there are few protons, hence there is less electrostatic repulsion. 
B)  that there are few electrons to provide the electrostatic attraction. 
C)  at low A the number of nearest neighbors per nucleon is small compared to higher a
A numbers. 
D)  at low A, the nucleus is less spherical, hence there is less surface tension. 
E)  None of the above statements is correct.

Question 13

A sphere of radius r1 collides with a sphere of radius r2. The cross section for a contact collision is

Accepted Answer

A)   $\pi$r 
B)  2 $\pi$r2  
C)  ½ $\pi$(r1 + r2)2  
D)   $\pi$(r1 + r2)2  
A)   $\pi$r 
B)  2 $\pi$r2  
C)  ½ $\pi$(r1 + r2)2  
D)   $\pi$(r1 + r2)2

Question 14

The graph shows the activity as a function of time for a radioisotope. The half-life of this particular radioisotope is approximately

Accepted Answer

A)  5 h 
B)  4 h 
C)  8 h 
D)  20 h 
E)  10 h 
A)  5 h 
B)  4 h 
C)  8 h 
D)  20 h 
E)  10 h

Question 15

Which of the following is a negatively charged particle found in the nucleus of an atom?

Accepted Answer

A)  proton 
B)  electron 
C)  neutron 
D)  nucleon 
E)  None of these is correct. 
A)  proton 
B)  electron 
C)  neutron 
D)  nucleon 
E)  None of these is correct.

Question 16

The pair of nuclides that represents isotopes is

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 17

In Positron Emission Tomography (or PET) scans, a very small amount of a radioactive drug is given to a patient. Fluorine-18 doped or labeled fluorodeoxyglucose, also called FDG, is a radioactive version of the sugar glucose with a half-life of 110 minutes. Once injected into the body, it will go to places where glucose is used for energy. For example, FDG will go to the brain, and, in particular, to those parts of the brain that are actively burning glucose for energy. A variety of different images are observed depending on the parts of the brain being used in certain tasks, such as reading or listening. If the patient came back at the same time the next day after their initial injection for a further scan, how much of the original Fluorine-18 activity would remain?

Accepted Answer

A)  zero 
B)  1.15 * 10-2 % 
C)  3.53 * 10-2 % 
D)  5.41 * 10-2 % 
E)  5.41 * 10-4 % 
A)  zero 
B)  1.15 * 10-2 % 
C)  3.53 * 10-2 % 
D)  5.41 * 10-2 % 
E)  5.41 * 10-4 %

Question 18

A flux of 1014 n/m2 · s is incident on an   foil that is 0.10 cm thick. The density of aluminum is 2.7 * 103 kg/m3. The number of neutrons reacting with the aluminum is 106 n/m2 · s. The cross section for this reaction is approximately

Accepted Answer

A)  104 barn 
B)  10-6 m2  
C)  1.7 * 10-34 m2  
D)  6.6 *10-32 m2  
A)  104 barn 
B)  10-6 m2  
C)  1.7 * 10-34 m2  
D)  6.6 *10-32 m2

Question 19

The beta spectrum for 12B decay is shown in the graph. The kinetic energy of an emitted $\beta$ particle is 6.00 MeV. The energy of the associated neutrino is approximately

Accepted Answer

A)  6.00 MeV 
B)  13.4 MeV 
C)  7.40 MeV 
D)  11.3 MeV 
E)  2.54 MeV 
A)  6.00 MeV 
B)  13.4 MeV 
C)  7.40 MeV 
D)  11.3 MeV 
E)  2.54 MeV

Question 20

In the $\alpha$ decay of uranium,   , the kinetic energy of the $\alpha$particle is approximately

Accepted Answer

A)  26.0 MeV 
B)  13.6 MeV 
C)  4.20 MeV 
D)  zero 
E)  10.0 keV 
A)  26.0 MeV 
B)  13.6 MeV 
C)  4.20 MeV 
D)  zero 
E)  10.0 keV

A thermal neutron

A radiologist uses a radioactive isotope of iodine, ¹²³I, for thyroid scans. She receives a shipment of 15 mCi of this isotope at noon on Tuesday. The half-life of this isotope is 13.2 h. How much activity remains at noon on Thursday of the same week?

Rutherford's experiments, in which he bombarded a very thin gold foil with alpha particles, showed that

The total binding energy of is approximately

A barn is a unit of

The neutrino was introduced as a part of the theory of beta decay because

A thermal neutron is a neutron whose kinetic energy is in thermal equilibrium with its surroundings. At room temperature this energy is approximately

A nuclear proton is changed into a neutron when

If the radioactivity of thorium C decreases to one-half in 1 h, in another 60 min its activity, compared with that at the beginning of the first hour, will be

The fact that the binding energy per nucleon is roughly a constant over most of the range of stable nuclei indicates that the nuclear force is

The solid line represents stable nuclei. A nucleus with an excess of protons and a tendency to decay with alpha particle emission is located at

One way to think about the low binding energy per nucleon for low A numbers is

A sphere of radius r₁ collides with a sphere of radius r₂. The cross section for a contact collision is

The graph shows the activity as a function of time for a radioisotope. The half-life of this particular radioisotope is approximately

Which of the following is a negatively charged particle found in the nucleus of an atom?

The pair of nuclides that represents isotopes is

A flux of 10¹⁴ n/m² · s is incident on an foil that is 0.10 cm thick. The density of aluminum is 2.7 * 10³ kg/m³. The number of neutrons reacting with the aluminum is 10⁶ n/m² · s. The cross section for this reaction is approximately

$In the \alpha decay of uranium, , the kinetic energy of the \alpha particle is approximately$ In the $\alpha$ decay of uranium, $In the \alpha decay of uranium, , the kinetic energy of the \alpha particle is approximately$ , the kinetic energy of the $\alpha$ particle is approximately

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

Exam 20: Nuclear Physics

A thermal neutron

A radiologist uses a radioactive isotope of iodine, 123I, for thyroid scans. She receives a shipment of 15 mCi of this isotope at noon on Tuesday. The half-life of this isotope is 13.2 h. How much activity remains at noon on Thursday of the same week?

Rutherford's experiments, in which he bombarded a very thin gold foil with alpha particles, showed that

The total binding energy of is approximately

A barn is a unit of

The neutrino was introduced as a part of the theory of beta decay because

A thermal neutron is a neutron whose kinetic energy is in thermal equilibrium with its surroundings. At room temperature this energy is approximately

A nuclear proton is changed into a neutron when

If the radioactivity of thorium C decreases to one-half in 1 h, in another 60 min its activity, compared with that at the beginning of the first hour, will be

The fact that the binding energy per nucleon is roughly a constant over most of the range of stable nuclei indicates that the nuclear force is

The solid line represents stable nuclei. A nucleus with an excess of protons and a tendency to decay with alpha particle emission is located at

One way to think about the low binding energy per nucleon for low A numbers is

A sphere of radius r1 collides with a sphere of radius r2. The cross section for a contact collision is

The graph shows the activity as a function of time for a radioisotope. The half-life of this particular radioisotope is approximately

Which of the following is a negatively charged particle found in the nucleus of an atom?

The pair of nuclides that represents isotopes is

A flux of 1014 n/m2 · s is incident on an foil that is 0.10 cm thick. The density of aluminum is 2.7 * 103 kg/m3. The number of neutrons reacting with the aluminum is 106 n/m2 · s. The cross section for this reaction is approximately

The beta spectrum for 12B decay is shown in the graph. The kinetic energy of an emitted β\betaβ particle is 6.00 MeV. The energy of the associated neutrino is approximately

In the α\alphaα decay of uranium, , the kinetic energy of the α\alphaα particle is approximately

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 radiologist uses a radioactive isotope of iodine, ¹²³I, for thyroid scans. She receives a shipment of 15 mCi of this isotope at noon on Tuesday. The half-life of this isotope is 13.2 h. How much activity remains at noon on Thursday of the same week?

A sphere of radius r₁ collides with a sphere of radius r₂. The cross section for a contact collision is

A flux of 10¹⁴ n/m² · s is incident on an foil that is 0.10 cm thick. The density of aluminum is 2.7 * 10³ kg/m³. The number of neutrons reacting with the aluminum is 10⁶ n/m² · s. The cross section for this reaction is approximately

$In the \alpha decay of uranium, , the kinetic energy of the \alpha particle is approximately$ In the $\alpha$ decay of uranium, $In the \alpha decay of uranium, , the kinetic energy of the \alpha particle is approximately$ , the kinetic energy of the $\alpha$ particle is approximately