Question 1

The neutral pion decays by π0 → 2ϒ. The mass of the neutral pion is 135 MeV/c2. What is the energy of each of the photons if the pion is at rest when it decays?

Accepted Answer

A)  270 MeV 
B)  135 MeV 
C)  67.5 MeV 
D)  1.02 MeV 
A)  270 MeV 
B)  135 MeV 
C)  67.5 MeV 
D)  1.02 MeV

Question 2

In addition to charge and baryon number, another conserved quantity in particle interactions is lepton number. The six leptons have lepton number +1, and their antiparticles have lepton number −1. The lepton numbers for each generation (electron, muon, tau) are separately conserved. For example, an electron has electron-lepton number +1, while the electron antineutrino has electron-lepton number −1. What is the missing particle X in the following reaction? vμ +   →   + X

Accepted Answer

A)  e− 
B)  τ− 
C)  μ− 
D)  π− 
E)    
A)  e− 
B)  τ− 
C)  μ− 
D)  π− 
E)

Question 3

The exchange particles for the strong interaction are

Accepted Answer

A)  positrons 
B)  quarks 
C)  leptons 
D)  gluons 
E)  muons 
A)  positrons 
B)  quarks 
C)  leptons 
D)  gluons 
E)  muons

Question 4

Which force does not diminish with increasing distance?

Accepted Answer

A)  the force between quarks 
B)  the force between opposite charges 
C)  the force between masses 
D)  the force between magnets 
E)  None of these choices are correct. 
A)  the force between quarks 
B)  the force between opposite charges 
C)  the force between masses 
D)  the force between magnets 
E)  None of these choices are correct.

Question 5

A bound triplet of quarks is called a

Accepted Answer

A)  beta particle. 
B)  meson. 
C)  baryon. 
D)  lepton. 
E)  neutrino. 
A)  beta particle. 
B)  meson. 
C)  baryon. 
D)  lepton. 
E)  neutrino.

Question 6

LHC stands for

Accepted Answer

A)  Lorentz Heavy Centrifuge. 
B)  Level Height Charges. 
C)  Laser Hertz Catalyzer. 
D)  Large Hadron Collider. 
E)  None of these choices are correct. 
A)  Lorentz Heavy Centrifuge. 
B)  Level Height Charges. 
C)  Laser Hertz Catalyzer. 
D)  Large Hadron Collider. 
E)  None of these choices are correct.

Question 7

Which of the following particles not considered to be elementary?

Accepted Answer

A)  the electron 
B)  the electron antineutrino 
C)  the neutron 
D)  the muon 
E)  the tau 
A)  the electron 
B)  the electron antineutrino 
C)  the neutron 
D)  the muon 
E)  the tau

Question 8

The proton has the quark structure

Accepted Answer

A)  uud 
B)  udd 
C)  uūd 
D)    
E)  ddd 
A)  uud 
B)  udd 
C)  uūd 
D)    
E)  ddd

Question 9

The neutrino does not

Accepted Answer

A)  have electric charge. 
B)  interact with other particles. 
C)  have momentum. 
D)  have energy. 
E)  have mass. 
A)  have electric charge. 
B)  interact with other particles. 
C)  have momentum. 
D)  have energy. 
E)  have mass.

Question 10

The LHC is located at CERN in

Accepted Answer

A)  Germany and Poland. 
B)  Switzerland and France. 
C)  France and Belgium. 
D)  the United States and Canada. 
E)  Texas. 
A)  Germany and Poland. 
B)  Switzerland and France. 
C)  France and Belgium. 
D)  the United States and Canada. 
E)  Texas.

Question 11

In the weak interaction in the decay of the neutron, what happens to the W− particle produced in the process?

Accepted Answer

A)  It decays into an electron. 
B)  It decays into a neutrino. 
C)  It decays into an electron and an electron neutrino. 
D)  It decays into an electron and an electron antineutrino. 
E)  Nothing; it stays a W− particle. 
A)  It decays into an electron. 
B)  It decays into a neutrino. 
C)  It decays into an electron and an electron neutrino. 
D)  It decays into an electron and an electron antineutrino. 
E)  Nothing; it stays a W− particle.

Question 12

A particle with a quark structure ds̄ is a

Accepted Answer

A)  baryon. 
B)  lepton. 
C)  meson. 
D)  proton. 
A)  baryon. 
B)  lepton. 
C)  meson. 
D)  proton.

Question 13

If a reaction involving hadrons were written at the quark level as ūd + uud → d   + X, which of the following could be the quark composition of the unknown last particle X?

Accepted Answer

A)  udc 
B)  uus 
C)  uds 
D)  u   
E)  cū 
A)  udc 
B)  uus 
C)  uds 
D)  u   
E)  cū

Question 14

Ordinary matter only contains which generation(s) of quarks?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  I and II 
E)  I, II, and III 
A)  I 
B)  II 
C)  III 
D)  I and II 
E)  I, II, and III

Question 15

An accelerator that slams particles moving in opposite directions into one another is called a

Accepted Answer

A)  collider 
B)  synchrotron 
C)  linear accelerator 
D)  storage ring 
E)  de Broglie modulator 
A)  collider 
B)  synchrotron 
C)  linear accelerator 
D)  storage ring 
E)  de Broglie modulator

Question 16

Hadrons that contain one or more strange quarks are called strange particles. When a strange hadron decays into particles that are not strange, it is a manifestation of the

Accepted Answer

A)  electromagnetic interaction. 
B)  strong interaction. 
C)  weak interaction. 
D)  gravitational interaction. 
A)  electromagnetic interaction. 
B)  strong interaction. 
C)  weak interaction. 
D)  gravitational interaction.

Question 17

The neutron decays into a proton, electron, and an electron antineutrino. Into what does the antineutron decay?

Accepted Answer

A)  a proton, positron, and electron antineutrino 
B)  an antiproton, positron, and electron neutrino 
C)  a proton, electron, and electron antineutrino 
D)  an antiproton, electron, and electron neutrino 
E)  an antiproton, electron, and electron antineutrino 
A)  a proton, positron, and electron antineutrino 
B)  an antiproton, positron, and electron neutrino 
C)  a proton, electron, and electron antineutrino 
D)  an antiproton, electron, and electron neutrino 
E)  an antiproton, electron, and electron antineutrino

Question 18

That matter is composed of quarks was first proposed by

Accepted Answer

A)  Blatt and Weiskopf. 
B)  Gell-Mann and Zweig. 
C)  Rutherford and Geiger. 
D)  Bardeen and Cooper. 
E)  Feynman and Schwinger. 
A)  Blatt and Weiskopf. 
B)  Gell-Mann and Zweig. 
C)  Rutherford and Geiger. 
D)  Bardeen and Cooper. 
E)  Feynman and Schwinger.

Question 19

The most recent unification of fundamental forces included which interactions?

Accepted Answer

A)  electromagnetic and gravitational 
B)  electromagnetic and strong 
C)  electromagnetic and weak 
D)  strong and weak 
E)  gravitational and weak 
A)  electromagnetic and gravitational 
B)  electromagnetic and strong 
C)  electromagnetic and weak 
D)  strong and weak 
E)  gravitational and weak

Question 20

Which of the answer choices below could be the unknown particle X in the following reaction? p + $ \mathrm {\bar{p}} $→ $ \pi^{+} $+ X

Accepted Answer

A)  π0 
B)  π− 
C)  e+ 
D)  p 
E)  $ \mathrm {\bar{n}} $ 
A)  π0 
B)  π− 
C)  e+ 
D)  p 
E)  $ \mathrm {\bar{n}} $

Exam 30: Particle Physics

The neutral pion decays by π0 → 2ϒ. The mass of the neutral pion is 135 MeV/c2. What is the energy of each of the photons if the pion is at rest when it decays?

The exchange particles for the strong interaction are

Which force does not diminish with increasing distance?

A bound triplet of quarks is called a

LHC stands for

Which of the following particles not considered to be elementary?

The proton has the quark structure

The neutrino does not

The LHC is located at CERN in

In the weak interaction in the decay of the neutron, what happens to the W− particle produced in the process?

A particle with a quark structure ds̄ is a

If a reaction involving hadrons were written at the quark level as ūd + uud → d + X, which of the following could be the quark composition of the unknown last particle X?

Ordinary matter only contains which generation(s) of quarks?

An accelerator that slams particles moving in opposite directions into one another is called a

Hadrons that contain one or more strange quarks are called strange particles. When a strange hadron decays into particles that are not strange, it is a manifestation of the

The neutron decays into a proton, electron, and an electron antineutrino. Into what does the antineutron decay?

That matter is composed of quarks was first proposed by

The most recent unification of fundamental forces included which interactions?

Which of the answer choices below could be the unknown particle X in the following reaction? p + pˉ \mathrm {\bar{p}} pˉ​ → π+ \pi^{+} π+ + X

Introduction

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Force and Newtons Laws of Motion

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Conservation of Energy

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Fluids

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Temperature and the Ideal Gas

Heat

Thermodynamics

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Electric Potential

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Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

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Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

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Filters

The neutral pion decays by π⁰ → 2_ϒ. The mass of the neutral pion is 135 MeV/c². What is the energy of each of the photons if the pion is at rest when it decays?

In the weak interaction in the decay of the neutron, what happens to the W⁻ particle produced in the process?

Which of the answer choices below could be the unknown particle X in the following reaction? p + $\mathrm {\bar{p}}$ → $\pi^{+}$ + X