Question 1

Which of the conservation laws listed below is violated by the reaction $\pi$+ + p $\rarr$ p + $\pi$- ?

Accepted Answer

A)  baryon number 
B)  electron-lepton number 
C)  muon-lepton number 
D)  charge 
E)  tau-lepton number 
A)  baryon number 
B)  electron-lepton number 
C)  muon-lepton number 
D)  charge 
E)  tau-lepton number

Question 2

Who is credited with first speculating that matter is composed of tiny unseen units?

Accepted Answer

A)  Democritus 
B)  Aristarchus 
C)  Aristotle 
D)  Newton 
E)  Einstein 
A)  Democritus 
B)  Aristarchus 
C)  Aristotle 
D)  Newton 
E)  Einstein

Question 3

The baryon having which of the following quark contents is electrically neutral?

Accepted Answer

A)  dds 
B)  bbc 
C)  uud 
D)  ucs 
A)  dds 
B)  bbc 
C)  uud 
D)  ucs

Question 4

Which of the following particles does not mediate the weak interaction?

Accepted Answer

A)  W+ 
B)  W- 
C)  $\pi$0 
D)  Z0 
E)  All of these choices mediate this interaction. 
A)  W+ 
B)  W- 
C)  $\pi$0 
D)  Z0 
E)  All of these choices mediate this interaction.

Question 5

In terms of e,what is the charge of a particle whose quark composition is uds?

Accepted Answer

A)  0 
B)  1 
C)  -1 
D)  2 
E)  -2 
A)  0 
B)  1 
C)  -1 
D)  2 
E)  -2

Question 6

What is the missing particle X in the reaction $\bar { v } _ { \mu } + \mathrm { P } \rightarrow \mathrm { n } + \mathrm { X }$ ?

Accepted Answer

A)  e+ 
B)  $\tau$+ 
C)  $\mu$+ 
D)  $\pi$+ 
E)  p 
A)  e+ 
B)  $\tau$+ 
C)  $\mu$+ 
D)  $\pi$+ 
E)  p

Question 7

If the top quark has a mass of 175 GeV/c2,what is its mass in atomic mass units?

Accepted Answer

A)  175 u 
B)  188 u 
C)  163 u 
D)  58 u 
E)  19 u 
A)  175 u 
B)  188 u 
C)  163 u 
D)  58 u 
E)  19 u

Question 8

What is the particle X in the reaction $\mathrm { p } + \overline { \mathrm { p } } \rightarrow \pi ^ { + } + \mathrm { X }$ ?

Accepted Answer

A)  $\pi$0 
B)  $\pi$- 
C)  e- 
D)  $\overline { \mathrm { p } }$ 
A)  $\pi$0 
B)  $\pi$- 
C)  e- 
D)  $\overline { \mathrm { p } }$

Question 9

Mesons are composed of

Accepted Answer

A)  any odd number of quarks. 
B)  three quarks of matching color. 
C)  three quarks of three different colors. 
D)  a colorless quark-antiquark pair. 
A)  any odd number of quarks. 
B)  three quarks of matching color. 
C)  three quarks of three different colors. 
D)  a colorless quark-antiquark pair.

Question 10

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

Accepted Answer

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

Question 11

Not counting antiparticles,how many different leptons are there?

Accepted Answer

A)  2 
B)  4 
C)  6 
D)  8 
E)  10 
A)  2 
B)  4 
C)  6 
D)  8 
E)  10

Question 12

Which of the fundamental interactions governs the following decay? $\pi ^ { + } \longrightarrow e ^ { + } + \nu$

Accepted Answer

A)  Strong nuclear 
B)  Electromagnetic 
C)  Gravitational 
D)  Weak nuclear 
A)  Strong nuclear 
B)  Electromagnetic 
C)  Gravitational 
D)  Weak nuclear

Question 13

The charge on a particle that has quark structure uus is _____ e.

Accepted Answer

A)  0 
B)  1 
C)  -1 
D)  2/3 
E)  -4/3 
A)  0 
B)  1 
C)  -1 
D)  2/3 
E)  -4/3

Question 14

The neutral pion decays by $\pi$0 $\rarr$2 $\lambda$.The rest 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 
E)  This decay cannot happen. 
A)  270 MeV 
B)  135 MeV 
C)  67.5 MeV 
D)  1.02 MeV 
E)  This decay cannot happen.

Question 15

Quarks come in how many flavors?

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  5 
E)  6 
A)  2 
B)  3 
C)  4 
D)  5 
E)  6

Question 16

Which force grows stronger with increasing distance?

Accepted Answer

A)  the force between quarks in colorless combinations 
B)  the force between charges with net charge zero 
C)  the force between masses 
D)  the force between magnets 
E)  None of these choices are correct. 
A)  the force between quarks in colorless combinations 
B)  the force between charges with net charge zero 
C)  the force between masses 
D)  the force between magnets 
E)  None of these choices are correct.

Question 17

The standard theory does not include which interaction?

Accepted Answer

A)  electromagnetic 
B)  gravitational 
C)  weak 
D)  strong 
E)  It contains all of these choices. 
A)  electromagnetic 
B)  gravitational 
C)  weak 
D)  strong 
E)  It contains all of these choices.

Question 18

The exchange particle that mediates the strong interaction is the

Accepted Answer

A)  gluon. 
B)  photon. 
C)  graviton. 
D)  neutrino. 
A)  gluon. 
B)  photon. 
C)  graviton. 
D)  neutrino.

Question 19

The weak interaction is mediated by

Accepted Answer

A)  gluon. 
B)  photon. 
C)  mesons. 
D)  W+,W-,Z0. 
E)  leptons. 
A)  gluon. 
B)  photon. 
C)  mesons. 
D)  W+,W-,Z0. 
E)  leptons.

Question 20

The quark flavors are

Accepted Answer

A)  up,down. 
B)  red,green. 
C)  muon,pion. 
D)  cyan,magenta. 
E)  lepton,gluon. 
A)  up,down. 
B)  red,green. 
C)  muon,pion. 
D)  cyan,magenta. 
E)  lepton,gluon.

Exam 30: Particle Physics

Which of the conservation laws listed below is violated by the reaction π\piπ + + p →\rarr→ p + π\piπ - ?

Who is credited with first speculating that matter is composed of tiny unseen units?

The baryon having which of the following quark contents is electrically neutral?

Which of the following particles does not mediate the weak interaction?

In terms of e,what is the charge of a particle whose quark composition is uds?

What is the missing particle X in the reaction vˉμ+P→n+X\bar { v } _ { \mu } + \mathrm { P } \rightarrow \mathrm { n } + \mathrm { X }vˉμ​+P→n+X ?

If the top quark has a mass of 175 GeV/c2,what is its mass in atomic mass units?

What is the particle X in the reaction p+p‾→π++X\mathrm { p } + \overline { \mathrm { p } } \rightarrow \pi ^ { + } + \mathrm { X }p+p​→π++X ?

Mesons are composed of

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

Not counting antiparticles,how many different leptons are there?

Which of the fundamental interactions governs the following decay? π+⟶e++ν\pi ^ { + } \longrightarrow e ^ { + } + \nuπ+⟶e++ν

The charge on a particle that has quark structure uus is _____ e.

The neutral pion decays by π\piπ 0 →\rarr→ 2 λ\lambdaλ .The rest 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?

Quarks come in how many flavors?

Which force grows stronger with increasing distance?

The standard theory does not include which interaction?

The exchange particle that mediates the strong interaction is the

The weak interaction is mediated by

The quark flavors are

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Filters

Which of the conservation laws listed below is violated by the reaction $\pi$ ⁺ + p $\rarr$ p + $\pi$ ^- ?

What is the missing particle X in the reaction $\bar { v } _ { \mu } + \mathrm { P } \rightarrow \mathrm { n } + \mathrm { X }$ ?

If the top quark has a mass of 175 GeV/c²,what is its mass in atomic mass units?

What is the particle X in the reaction $\mathrm { p } + \overline { \mathrm { p } } \rightarrow \pi ^ { + } + \mathrm { X }$ ?

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

Which of the fundamental interactions governs the following decay? $\pi ^ { + } \longrightarrow e ^ { + } + \nu$

The neutral pion decays by $\pi$ ⁰ $\rarr$ 2 $\lambda$ .The rest 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?