Question 1

The proton composition by quarks is

Accepted Answer

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

Question 2

An electron is an example of

Accepted Answer

A) a lepton. 
B) a meson. 
C) a baryon. 
D) a gauge boson. 
E) hadrons. 
A) a lepton. 
B) a meson. 
C) a baryon. 
D) a gauge boson. 
E) hadrons. A

Question 3

A deuteron has the same charge as a proton but approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 MHz. What magnetic field is needed?

Accepted Answer

A) 0.011 T 
B) 0.11 T 
C) 1.1 T 
D) 11 T 
E) 111 T 
A) 0.011 T 
B) 0.11 T 
C) 1.1 T 
D) 11 T 
E) 111 T C

Question 4

A photon is an example of

Accepted Answer

A) a lepton. 
B) a meson. 
C) a baryon. 
D) a gauge boson. 
E) hadrons. 
A) a lepton. 
B) a meson. 
C) a baryon. 
D) a gauge boson. 
E) hadrons.

Question 5

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

Accepted Answer

A) the baryon number is not conserved. 
B) the lepton number is not conserved. 
C) the angular momentum cannot conserved. 
D) the charge is not conserved. 
E) The statement is untrue; the reaction is possible. 
A) the baryon number is not conserved. 
B) the lepton number is not conserved. 
C) the angular momentum cannot conserved. 
D) the charge is not conserved. 
E) The statement is untrue; the reaction is possible.

Question 6

Is the following decay permissible? Σ+ → Λ° + π+

Accepted Answer

A) Yes. 
B) No, because charge is not conserved. 
C) No, because mass is created. 
D) No, because lepton number is not conserved. 
A) Yes. 
B) No, because charge is not conserved. 
C) No, because mass is created. 
D) No, because lepton number is not conserved.

Question 7

The Large Hadron Collider is expected to produce protons with kinetic energy 7 TeV. What is the speed of these protons?

Accepted Answer

A) less than 0.9000 c 
B) 0.9500 c 
C) 0.9990 c 
D) greater than 0.9999 c 
E) 0.9000 c 
A) less than 0.9000 c 
B) 0.9500 c 
C) 0.9990 c 
D) greater than 0.9999 c 
E) 0.9000 c

Question 8

One of the particle groups listed below includes two other groups on the list. Which group is it?

Accepted Answer

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

Question 9

One reason a photon could not create an odd number of electrons and positrons is that such a process would

Accepted Answer

A) not conserve charge. 
B) not conserve energy. 
C) require photon energies that are not attainable. 
D) result in the creation of mass. 
E) result in the destruction of mass. 
A) not conserve charge. 
B) not conserve energy. 
C) require photon energies that are not attainable. 
D) result in the creation of mass. 
E) result in the destruction of mass.

Question 10

Is the following decay allowed? Σ+ → p + π+

Accepted Answer

A) Yes. 
B) No, because charge is not conserved. 
C) No, because mass is created. 
D) No, because lepton number is not conserved. 
A) Yes. 
B) No, because charge is not conserved. 
C) No, because mass is created. 
D) No, because lepton number is not conserved.

Question 11

A proton is an example of

Accepted Answer

A) a lepton. 
B) a meson. 
C) a baryon. 
D) a gauge boson. 
E) none of the above. 
A) a lepton. 
B) a meson. 
C) a baryon. 
D) a gauge boson. 
E) none of the above.

Question 12

The competition between the electrostatic force between the protons in a nucleus and the strong nuclear force determines whether a nucleus is stable.

Accepted Answer

A) True 
 B)False

Question 13

Particles that do not interact via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) are called

Accepted Answer

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

Question 14

When a positronium atom (electron + positron) decays, it emits two photons. What are the energies of the photons?

Accepted Answer

A) 0.511 MeV and 1.022 MeV 
B) 0.225 MeV and 1.022 MeV 
C) 0.225 MeV and 0.285 MeV 
D) 0.256 MeV and 0.256 MeV 
E) 0.511 MeV and 0.511 MeV 
A) 0.511 MeV and 1.022 MeV 
B) 0.225 MeV and 1.022 MeV 
C) 0.225 MeV and 0.285 MeV 
D) 0.256 MeV and 0.256 MeV 
E) 0.511 MeV and 0.511 MeV

Question 15

If electrons are accelerated from rest in a 30 MeV tandem Van de Graaff Accelerator, what is their final kinetic energy?

Accepted Answer

A) 15 MeV 
B) 20 MeV 
C) 30 MeV 
D) 40 MeV 
E) 60 MeV 
A) 15 MeV 
B) 20 MeV 
C) 30 MeV 
D) 40 MeV 
E) 60 MeV

Question 16

The neutrino has

Accepted Answer

A) enormous rest mass, positive charge, and spin quantum number 1/2. 
B) enormous rest mass, no charge, and spin quantum number 1. 
C) negligible rest mass, negative charge, and spin quantum number 1. 
D) negligible rest mass, no charge, and spin quantum number 1/2. 
E) none of the given answers 
A) enormous rest mass, positive charge, and spin quantum number 1/2. 
B) enormous rest mass, no charge, and spin quantum number 1. 
C) negligible rest mass, negative charge, and spin quantum number 1. 
D) negligible rest mass, no charge, and spin quantum number 1/2. 
E) none of the given answers

Question 17

A neutron is an example of

Accepted Answer

A) a lepton. 
B) a meson. 
C) a baryon. 
D) a gauge boson. 
E) none of the above. 
A) a lepton. 
B) a meson. 
C) a baryon. 
D) a gauge boson. 
E) none of the above.

Question 18

An electron with an energy of 20 GeV (3.20 × 10-9 J) moving in the +x direction collides head on with a stationary proton. After the collision, the electron travels in the -x direction. What is the momentum of the electron after the collision? Note that this is an ultrarelativistic collision so that the energy of the moving masses can be approximated by the expression E ≈ pc. The mass of a proton is 1.67 × 10-27 kg and that of an electron is 9.11 × 10-31kg.

Accepted Answer

A) 2.5 × 10-19 kg∙m/s 
B) 5.0 × 10-19 kg∙m/s 
C) 1.1 × 10-17 kg∙m/s 
D) 2.2 × 10-17 kg∙m/s 
E) 2.7 × 10-22 kg∙m/s 
A) 2.5 × 10-19 kg∙m/s 
B) 5.0 × 10-19 kg∙m/s 
C) 1.1 × 10-17 kg∙m/s 
D) 2.2 × 10-17 kg∙m/s 
E) 2.7 × 10-22 kg∙m/s

Question 19

The greater the width of a resonance,

Accepted Answer

A) the greater the rest energy of the resonance. 
B) the greater the lifetime of the resonance. 
C) the lower the rest energy of the resonance. 
D) the shorter the lifetime of the resonance. 
E) None of the above answers are correct. 
A) the greater the rest energy of the resonance. 
B) the greater the lifetime of the resonance. 
C) the lower the rest energy of the resonance. 
D) the shorter the lifetime of the resonance. 
E) None of the above answers are correct.

Question 20

An electron undergoes a collision with a proton. In the center of mass system, the energy of the electron is 4000 MeV. What is the energy of the electron in the lab system, where the proton is at rest before the collision?

Accepted Answer

A) 34 GeV 
B) 37 GeV 
C) 40 GeV 
D) 43 GeV 
E) 46 GeV
F)52 GeV 
A) 34 GeV 
B) 37 GeV 
C) 40 GeV 
D) 43 GeV 
E) 46 GeV
F)52 GeV

Exam 43: Elementary Particle

The proton composition by quarks is

An electron is an example of

A deuteron has the same charge as a proton but approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 MHz. What magnetic field is needed?

A photon is an example of

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

Is the following decay permissible? Σ+ → Λ° + π+

The Large Hadron Collider is expected to produce protons with kinetic energy 7 TeV. What is the speed of these protons?

One of the particle groups listed below includes two other groups on the list. Which group is it?

One reason a photon could not create an odd number of electrons and positrons is that such a process would

Is the following decay allowed? Σ+ → p + π+

A proton is an example of

The competition between the electrostatic force between the protons in a nucleus and the strong nuclear force determines whether a nucleus is stable.

Particles that do not interact via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) are called

When a positronium atom (electron + positron) decays, it emits two photons. What are the energies of the photons?

If electrons are accelerated from rest in a 30 MeV tandem Van de Graaff Accelerator, what is their final kinetic energy?

The neutrino has

A neutron is an example of

The greater the width of a resonance,

An electron undergoes a collision with a proton. In the center of mass system, the energy of the electron is 4000 MeV. What is the energy of the electron in the lab system, where the proton is at rest before the collision?

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 reaction p + e^- → + e⁺is not possible because

Is the following decay permissible? Σ⁺ → Λ° + π⁺

Is the following decay allowed? Σ⁺ → p + π⁺