Question 1

What is the wavelength of a 20-GeV alpha particle?

Accepted Answer

A) 0.25 fm 
B) 0.063 fm 
C) 0.099 fm 
D) less than 10-18 m 
E) 0.50 fm 
A) 0.25 fm 
B) 0.063 fm 
C) 0.099 fm 
D) less than 10-18 m 
E) 0.50 fm

Question 2

Which of the following can occur?

Accepted Answer

A) π+ → μ+ + vμ 
B) p + n → p + p +   
C) K+ → π° 
D) μ- → e- + ve + vμ 
E) K+ → 2π° 
A) π+ → μ+ + vμ 
B) p + n → p + p +   
C) K+ → π° 
D) μ- → e- + ve + vμ 
E) K+ → 2π°

Question 3

What is the charge, baryon number, and minimum angular momentum for the udd combination of quarks?

Accepted Answer

A) 1, 0,   
B) 0, 1,   
C) 1, 1,   
D) 0, 0, 0 
E) 0, 0,   
A) 1, 0,   
B) 0, 1,   
C) 1, 1,   
D) 0, 0, 0 
E) 0, 0,

Question 4

The number of quarks in a deuteron (2H) is

Accepted Answer

A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 6. 
A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 6.

Question 5

The color charge of leptons is

Accepted Answer

A) violet. 
B) red. 
C) blue. 
D) zero. 
E) green. 
A) violet. 
B) red. 
C) blue. 
D) zero. 
E) green.

Question 6

Quarks can only have a charge of +(2/3)e or -(1/3)e, while antiquarks can only have charges of -(2/3)e or +(1/3)e.

Accepted Answer

A) True 
 B)False

Question 7

What is the quark composition of a Λ°?

Accepted Answer

A) uud 
B) uus 
C) uds 
D) uss 
E) udd 
A) uud 
B) uus 
C) uds 
D) uss 
E) udd

Question 8

The voltage across the dees of a cyclotron is 30,000 V. How many revolutions do the protons go through in reaching 21 MeV kinetic energy?

Accepted Answer

A) more than 2 x 106 
B) 1400 
C) 700 
D) 350 
E) 35 
A) more than 2 x 106 
B) 1400 
C) 700 
D) 350 
E) 35

Question 9

Scientists hope that some day they will be able to produce a theory which will combine the strong force, the weak nuclear force, and electromagnetism. This theory has been called

Accepted Answer

A) The Grand Unified Theory. 
B) The Theory of Everything. 
C) The Unified Field Theory. 
D) The Electroweak Theory. 
E) The Electrostrong Theory. 
A) The Grand Unified Theory. 
B) The Theory of Everything. 
C) The Unified Field Theory. 
D) The Electroweak Theory. 
E) The Electrostrong Theory.

Question 10

The strong nuclear force acts only on neutral particles.

Accepted Answer

A) True 
 B)False

Question 11

The reaction p +   → e+ + γ is not possible because

Accepted Answer

A) angular momentum cannot be conserved in such a reaction. 
B) baryon number is not conserved in such a reaction. 
C) lepton number is not conserved in such a reaction. 
D) charge is not conserved in such a reaction. 
E) The statement is not true; the reaction is possible. 
A) angular momentum cannot be conserved in such a reaction. 
B) baryon number is not conserved in such a reaction. 
C) lepton number is not conserved in such a reaction. 
D) charge is not conserved in such a reaction. 
E) The statement is not true; the reaction is possible.

Question 12

Which of the following combinations of quarks can form a particle with a unit charge, a baryon number of zero, and a minimum angular momentum of zero?

Accepted Answer

A) u   
B) udd 
C)    d 
D) uud 
E) ud 
A) u   
B) udd 
C)    d 
D) uud 
E) ud

Question 13

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

Accepted Answer

uud, with

Question 14

The exchange particles for the weak force are very massive (about 100 times as massive as a proton). This would lead one to expect that the weak force would

Accepted Answer

A) act over a very long range. 
B) act over a very short range. 
C) only act on very massive particles. 
D) only act on very light particles. 
E) be transmitted at the speed of light. 
A) act over a very long range. 
B) act over a very short range. 
C) only act on very massive particles. 
D) only act on very light particles. 
E) be transmitted at the speed of light.

Question 15

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotron?

Accepted Answer

A) 3.7 keV 
B) 7.8 keV 
C) 8.7 keV 
D) 7.8 MeV 
E) 8.7 MeV 
A) 3.7 keV 
B) 7.8 keV 
C) 8.7 keV 
D) 7.8 MeV 
E) 8.7 MeV

Question 16

The π+ meson composition by quarks is

Accepted Answer

A) ud. 
B)    d. 
C) u   . 
D)   
  . 
E) none of the above 
A) ud. 
B)    d. 
C) u   . 
D)   
  . 
E) none of the above

Question 17

Composite particles that are composed of three quarks are called

Accepted Answer

A) leptons. 
B) hadrons. 
C) mesons. 
D) bosons. 
E) baryons. 
A) leptons. 
B) hadrons. 
C) mesons. 
D) bosons. 
E) baryons.

Question 18

Composite particles that are composed of a quark and antiquark pair are called

Accepted Answer

A) leptons. 
B) hadrons. 
C) mesons. 
D) bosons. 
E) baryons. 
A) leptons. 
B) hadrons. 
C) mesons. 
D) bosons. 
E) baryons.

Question 19

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

Accepted Answer

udd, with

Question 20

The Feynman diagram shows two electrons approaching each other, interacting, and then leaving each other. What particle is being exchanged during the interaction?   FIGURE 43-1

Accepted Answer

A) pion 
B) meson 
C) virtual photon 
D) neutrino 
E) W particle 
A) pion 
B) meson 
C) virtual photon 
D) neutrino 
E) W particle

Exam 43: Elementary Particle

What is the wavelength of a 20-GeV alpha particle?

Which of the following can occur?

What is the charge, baryon number, and minimum angular momentum for the udd combination of quarks?

The number of quarks in a deuteron (2H) is

The color charge of leptons is

Quarks can only have a charge of +(2/3)e or -(1/3)e, while antiquarks can only have charges of -(2/3)e or +(1/3)e.

What is the quark composition of a Λ°?

The voltage across the dees of a cyclotron is 30,000 V. How many revolutions do the protons go through in reaching 21 MeV kinetic energy?

Scientists hope that some day they will be able to produce a theory which will combine the strong force, the weak nuclear force, and electromagnetism. This theory has been called

The strong nuclear force acts only on neutral particles.

The reaction p + → e+ + γ is not possible because

Which of the following combinations of quarks can form a particle with a unit charge, a baryon number of zero, and a minimum angular momentum of zero?

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

The exchange particles for the weak force are very massive (about 100 times as massive as a proton). This would lead one to expect that the weak force would

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotron?

The π+ meson composition by quarks is

Composite particles that are composed of three quarks are called

Composite particles that are composed of a quark and antiquark pair are called

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

The Feynman diagram shows two electrons approaching each other, interacting, and then leaving each other. What particle is being exchanged during the interaction? FIGURE 43-1

Introduction, Measurement, Estimating

Describing Motion: Kinematics in One Dimension

Kinematics in Two or Three Dimensions; Vectors

Dynamics: Newtons Laws of Motion

Using Newtons Laws: Friction, Circular Motion, Drag Forces

Gravitation and Newtons6 Synthesis

Work and Energy

Conservation of Energy

Linear Momentum

Rotational Motion

Angular Momentum; General Rotation

Static Equilibrium; Elasticity and Fracture

Fluids

Oscillations

Wave Motion

Sound

Temperature, Thermal Expansion, and the Ideal Gas Law

Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance, Dielectrics, Electric Energy Storage

Electric Currents and Resistance

Dc Circuits

Magnetism

Sources of Magnetic Field

Electromagnetic Induction and Faradays Law

Inductance, Electromagnetic Oscillations, and Ac Circuits

Maxwells Equations and Electromagnetic Waves

Light: Reflection and Refraction

Lenses and Optical Instruments

The Wave Nature of Light; Interference

Diffraction and Polarization

Special Theory of Relativity

Early Quantum Theory and Models of the Atom

Quantum Mechanics

Quantum Mechanics of Atoms

Molecules and Solids

Nuclear Physics and Radioactivity

Nuclear Energy: Efects and Uses of Radiation

Astrophysics and Cosmology

Filters

The number of quarks in a deuteron (²H) is

The reaction p + → e⁺ + γ is not possible because

The π⁺ meson composition by quarks is