Question 1

A down quark can be changed into an up quark (plus other particles perhaps) by:

Accepted Answer

A)  the gravitational interaction 
B)  the electromagnetic interaction 
C)  the weak interaction 
D)  the strong interaction 
E)  none of these 
A)  the gravitational interaction 
B)  the electromagnetic interaction 
C)  the weak interaction 
D)  the strong interaction 
E)  none of these C

Question 2

A particle can decay to particles with greater rest mass:

Accepted Answer

A)  only if antiparticles are produced 
B)  only if photons are also produced 
C)  only if neutrinos are also produced 
D)  only if the original particle has kinetic energy 
E)  never 
A)  only if antiparticles are produced 
B)  only if photons are also produced 
C)  only if neutrinos are also produced 
D)  only if the original particle has kinetic energy 
E)  never E

Question 3

Two particles interact to produce only photons, with the original particles disappearing. The particles must have been:

Accepted Answer

A)  mesons 
B)  strange particles 
C)  strongly interacting 
D)  leptons 
E)  a particle, antiparticle pair 
A)  mesons 
B)  strange particles 
C)  strongly interacting 
D)  leptons 
E)  a particle, antiparticle pair E

Question 4

A certain process produces baryons that decay with a lifetime of 4 * 10-24 s. The decay is a result of:

Accepted Answer

A)  the gravitational interaction 
B)  the weak interaction 
C)  the electromagnetic interaction 
D)  the strong interaction 
E)  some combination of the above 
A)  the gravitational interaction 
B)  the weak interaction 
C)  the electromagnetic interaction 
D)  the strong interaction 
E)  some combination of the above

Question 5

Messenger particles of the strong interaction are called:

Accepted Answer

A)  gluons 
B)  photons 
C)  W and Z 
D)  gravitons 
E)  pions 
A)  gluons 
B)  photons 
C)  W and Z 
D)  gravitons 
E)  pions

Question 6

$\pi$+ represents a pion (a meson), $\mu$- represents a muon (a lepon), ve represents an electron neutrino (a lepton), and v $\mu$  and p represents a proton a muon neutrino (a lepton). Which of the following decays might occur?

Accepted Answer

A)   $\pi$+ $\rightarrow$$\mu$- + v $\mu$ 
B)   $\pi$+ $\rightarrow$$\mu$+ + ve 
C)    
D)    
E)   $\pi$+ $\rightarrow$$\mu$+ + v $\mu$ 
A)   $\pi$+ $\rightarrow$$\mu$- + v $\mu$ 
B)   $\pi$+ $\rightarrow$$\mu$+ + ve 
C)    
D)    
E)   $\pi$+ $\rightarrow$$\mu$+ + v $\mu$

Question 7

The up quark u has charge +2e/3 and strangeness 0; the down quark d has charge -e/3 and strangeness 0; the strange quark s has charge -e/3 and strangeness -1. This means there can be no baryon with:

Accepted Answer

A)  charge 0 and strangeness 0 
B)  charge -e and strangeness -1 
C)  charge +e and strangeness -1 
D)  charge +e and strangeness -2 
E)  charge 0 and strangeness +2 
A)  charge 0 and strangeness 0 
B)  charge -e and strangeness -1 
C)  charge +e and strangeness -1 
D)  charge +e and strangeness -2 
E)  charge 0 and strangeness +2

Question 8

The interaction  $\pi$- + p $\rightarrow$K- + $\Sigma$+ violates the principle of conservation of:

Accepted Answer

A)  baryon number 
B)  lepton number 
C)  strangeness 
D)  angular momentum 
E)  none of these 
A)  baryon number 
B)  lepton number 
C)  strangeness 
D)  angular momentum 
E)  none of these

Question 9

The up quark u has charge +2/3 and strangeness 0; the down quark d has charge -1/3 and strangeness 0; the strange quark s has charge -1/3 and strangeness -1. This means there can be no meson with:

Accepted Answer

A)  charge 0 and strangeness -1 
B)  charge -1 and strangeness -1 
C)  charge +1 and strangeness -1 
D)  charge -1 and strangeness +1 
E)  charge 0 and strangeness +1 
A)  charge 0 and strangeness -1 
B)  charge -1 and strangeness -1 
C)  charge +1 and strangeness -1 
D)  charge -1 and strangeness +1 
E)  charge 0 and strangeness +1

Question 10

A baryon with strangeness -1 decays via the strong interaction into two particles, one of which is a baryon with strangeness 0. The other might be:

Accepted Answer

A)  a baryon with strangeness 0 
B)  a baryon with strangeness +1 
C)  a meson with strangeness -1 
D)  a meson with strangeness +1 
E)  a meson with strangeness 0 
A)  a baryon with strangeness 0 
B)  a baryon with strangeness +1 
C)  a meson with strangeness -1 
D)  a meson with strangeness +1 
E)  a meson with strangeness 0

Question 11

Hubble's law is evidence that:

Accepted Answer

A)  the speed of light is increasing 
B)  the universe is expanding 
C)  the Earth is slowing down in its orbit 
D)  galaxies have rotational motion 
E)  none of the above 
A)  the speed of light is increasing 
B)  the universe is expanding 
C)  the Earth is slowing down in its orbit 
D)  galaxies have rotational motion 
E)  none of the above

Question 12

A positron cannot decay into three neutrinos. Of the following conservation laws, which would be violated if it did?

Accepted Answer

A)  Energy 
B)  Baryon number 
C)  Lepton number 
D)  Linear momentum 
E)  Angular momentum 
A)  Energy 
B)  Baryon number 
C)  Lepton number 
D)  Linear momentum 
E)  Angular momentum

Question 13

Which of the following particles has a lepton number of zero?

Accepted Answer

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

Question 14

A particle with spin angular momentum   is called a:

Accepted Answer

A)  lepton 
B)  hadron 
C)  fermion 
D)  boson 
E)  electron 
A)  lepton 
B)  hadron 
C)  fermion 
D)  boson 
E)  electron

Question 15

Two baryons interact to produce pions only, the original baryons disappearing. One of the baryons must have been:

Accepted Answer

A)  a proton 
B)  an omega minus 
C)  a sigma 
D)  an antiparticle 
E)  none of these 
A)  a proton 
B)  an omega minus 
C)  a sigma 
D)  an antiparticle 
E)  none of these

Question 16

Messenger particles of the weak interaction are called:

Accepted Answer

A)  gluons 
B)  photons 
C)  W and Z 
D)  gravitons 
E)  pions 
A)  gluons 
B)  photons 
C)  W and Z 
D)  gravitons 
E)  pions

Question 17

All leptons interact with each other via the:

Accepted Answer

A)  strong force 
B)  weak force 
C)  electromagnetic force 
D)  strange force 
E)  none of these 
A)  strong force 
B)  weak force 
C)  electromagnetic force 
D)  strange force 
E)  none of these

Question 18

Color is carried by:

Accepted Answer

A)  only quarks 
B)  only leptons 
C)  only quarks and leptons 
D)  only quarks and gluons 
E)  only photons and gluons 
A)  only quarks 
B)  only leptons 
C)  only quarks and leptons 
D)  only quarks and gluons 
E)  only photons and gluons

Question 19

The stability of the proton is predicted by the laws of conservation of energy and conservation of:

Accepted Answer

A)  momentum 
B)  angular momentum 
C)  baryon number 
D)  lepton number 
E)  strangeness 
A)  momentum 
B)  angular momentum 
C)  baryon number 
D)  lepton number 
E)  strangeness

Question 20

The baryon number of a quark is:

Accepted Answer

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

Exam 44: Quarks, Leptons, and the Big Bang

A down quark can be changed into an up quark (plus other particles perhaps) by:

A particle can decay to particles with greater rest mass:

Two particles interact to produce only photons, with the original particles disappearing. The particles must have been:

A certain process produces baryons that decay with a lifetime of 4 * 10-24 s. The decay is a result of:

Messenger particles of the strong interaction are called:

π\piπ + represents a pion (a meson), μ\muμ - represents a muon (a lepon), ve represents an electron neutrino (a lepton), and v μ\muμ and p represents a proton a muon neutrino (a lepton). Which of the following decays might occur?

The up quark u has charge +2e/3 and strangeness 0; the down quark d has charge -e/3 and strangeness 0; the strange quark s has charge -e/3 and strangeness -1. This means there can be no baryon with:

The interaction π\piπ - + p →\rightarrow→ K- + Σ\SigmaΣ + violates the principle of conservation of:

The up quark u has charge +2/3 and strangeness 0; the down quark d has charge -1/3 and strangeness 0; the strange quark s has charge -1/3 and strangeness -1. This means there can be no meson with:

A baryon with strangeness -1 decays via the strong interaction into two particles, one of which is a baryon with strangeness 0. The other might be:

Hubble's law is evidence that:

A positron cannot decay into three neutrinos. Of the following conservation laws, which would be violated if it did?

Which of the following particles has a lepton number of zero?

A particle with spin angular momentum is called a:

Two baryons interact to produce pions only, the original baryons disappearing. One of the baryons must have been:

Messenger particles of the weak interaction are called:

All leptons interact with each other via the:

Color is carried by:

The stability of the proton is predicted by the laws of conservation of energy and conservation of:

The baryon number of a quark is:

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

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Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

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Gauss Law

Electric Potential

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Current and Resistance

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Magnetic Fields

Magnetic Fields Due to Currents

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Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

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Relativity

Photons and Matter Waves

More About Matter Waves

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Conduction of Electricity in Solids

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Energy From the Nucleus

Filters

A certain process produces baryons that decay with a lifetime of 4 * 10^-²⁴ s. The decay is a result of:

$\pi$ ⁺ represents a pion (a meson), $\mu$ ^- represents a muon (a lepon), v_e represents an electron neutrino (a lepton), and v _$\mu$ and p represents a proton a muon neutrino (a lepton). Which of the following decays might occur?

The interaction $\pi$ ^- + p $\rightarrow$ K^- + $\Sigma$ ⁺ violates the principle of conservation of: