Question 1

All known quarks 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 2

Which of the following particles is stable?

Accepted Answer

A)  Neutron 
B)  Proton 
C)  Pion 
D)  Muon 
E)  Kaon 
A)  Neutron 
B)  Proton 
C)  Pion 
D)  Muon 
E)  Kaon

Question 3

Any meson 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 4

Different types of neutrinos can be distinguished from each other by:

Accepted Answer

A)  the directions of their spins 
B)  the leptons with which they interact 
C)  the baryons with which they interact 
D)  the number of photons that accompany them 
E)  their baryon numbers 
A)  the directions of their spins 
B)  the leptons with which they interact 
C)  the baryons with which they interact 
D)  the number of photons that accompany them 
E)  their baryon numbers

Question 5

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

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

Question 6

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 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

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 9

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 10

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 11

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 12

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

Exam 44: Quarks, Leptons, and the Big Bang

All known quarks have:

Which of the following particles is stable?

Any meson is a combination of:

Different types of neutrinos can be distinguished from each other by:

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

All leptons interact with each other via the:

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

Messenger particles of the strong interaction are called:

The two basic interactions that have finite ranges are:

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

The color theory explains why quarks:

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:

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