Question 1

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 C

Question 2

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 B

Question 3

Quarks are the constituents of:

Accepted Answer

A)  all particles 
B)  all leptons 
C)  all strongly interacting particles 
D)  only strange particles 
E)  only mesons 
A)  all particles 
B)  all leptons 
C)  all strongly interacting particles 
D)  only strange particles 
E)  only mesons C

Question 4

The two basic interactions that have finite ranges are:

Accepted Answer

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

Question 5

When a kaon decays via the strong interaction the products must include a:

Accepted Answer

A)  baryon 
B)  lepton 
C)  strange particle 
D)  electron 
E)  neutrino 
A)  baryon 
B)  lepton 
C)  strange particle 
D)  electron 
E)  neutrino

Question 6

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 7

The interaction  $\pi$- + p $\rightarrow$  $\pi$- + $\Sigma$+ 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 8

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

Question 9

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 10

The color theory explains why quarks:

Accepted Answer

A)  form particles in pairs and triplets 
B)  have charge that is a multiple of e/3 
C)  have spin 
D)  have mass 
E)  none of the above 
A)  form particles in pairs and triplets 
B)  have charge that is a multiple of e/3 
C)  have spin 
D)  have mass 
E)  none of the above

Question 11

A baryon is a combination of:

Accepted Answer

A)  three quarks 
B)  two quarks and an antiquark 
C)  one quark and two antiquarks 
D)  one quark and one antiquark 
E)  two quarks 
A)  three quarks 
B)  two quarks and an antiquark 
C)  one quark and two antiquarks 
D)  one quark and one antiquark 
E)  two quarks

Question 12

The quark content of a proton is:

Accepted Answer

A)  uuu 
B)  uud 
C)  udd 
D)  ddd 
E)  uds 
A)  uuu 
B)  uud 
C)  udd 
D)  ddd 
E)  uds

Question 13

All known quarks and antiquarks have:

Accepted Answer

A)  charges that are multiples of e and integer baryon numbers 
B)  charges that are multiples of e and baryon numbers that are either +1/3 or -1/3 
C)  charges that are multiples of e/3 and integer baryon numbers 
D)  charges that are multiples of e/3 and baryon numbers that are either +1/3 or -1/3 
E)  charges that are multiples of 2e/3 and baryon numbers that are either +1/3 or -1/3 
A)  charges that are multiples of e and integer baryon numbers 
B)  charges that are multiples of e and baryon numbers that are either +1/3 or -1/3 
C)  charges that are multiples of e/3 and integer baryon numbers 
D)  charges that are multiples of e/3 and baryon numbers that are either +1/3 or -1/3 
E)  charges that are multiples of 2e/3 and baryon numbers that are either +1/3 or -1/3

Question 14

A certain process produces mesons that decay with a lifetime of 6 * 10-10 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 15

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 16

The baryon number of a quark is:

Accepted Answer

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

Question 17

Which of the following statements is correct?

Accepted Answer

A)  All leptons are bosons. 
B)  All hadrons are fermions. 
C)  The two types of mesons are leptons and baryons. 
D)  The two types of hadrons are mesons and baryons. 
E)  The two types of leptons are mesons and fermions. 
A)  All leptons are bosons. 
B)  All hadrons are fermions. 
C)  The two types of mesons are leptons and baryons. 
D)  The two types of hadrons are mesons and baryons. 
E)  The two types of leptons are mesons and fermions.

Question 18

Compared to the lifetimes of particles that decay via the weak interaction, the lifetimes of particles that decay via the strong interaction are:

Accepted Answer

A)  10-23 times as long 
B)  10-12 times as long 
C)  1012 times as long 
D)  1024 times as long 
E)  about the same 
A)  10-23 times as long 
B)  10-12 times as long 
C)  1012 times as long 
D)  1024 times as long 
E)  about the same

Question 19

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 20

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

Accepted Answer

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

Exam 44: Quarks, Leptons, and the Big Bang

Messenger particles of the weak interaction are called:

Hubble's law is evidence that:

Quarks are the constituents of:

The two basic interactions that have finite ranges are:

When a kaon decays via the strong interaction the products must include a:

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

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

A particle can decay to particles with greater rest mass:

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

The color theory explains why quarks:

A baryon is a combination of:

The quark content of a proton is:

All known quarks and antiquarks have:

A certain process produces mesons that decay with a lifetime of 6 * 10-10 s. The decay is a result of:

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

The baryon number of a quark is:

Which of the following statements is correct?

Compared to the lifetimes of particles that decay via the weak interaction, the lifetimes of particles that decay via the strong interaction are:

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

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

Waves I

Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

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:

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

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

A certain process produces mesons that decay with a lifetime of 6 * 10^-10 s. The decay is a result of: