Question 1

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

Accepted Answer

A)   baryon number
B)   lepton number
C)   strangeness
D)   angular momentum
E)   none of these F) B) and E)
G) None of the above

Question 2

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 +2F) B) and D)
G) D) and E)

Question 3

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 0F) C) and D)
G) B) and E)

Question 4

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 +1F) A) and E)
G) C) and E)

Question 5

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 theseF) A) and B)
G) None of the above

Question 6

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 momentumF) C) and E)
G) A) and E)

Question 7

Messenger particles of the strong interaction are called:

Accepted Answer

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

Question 8

Messenger particles of the weak interaction are called:

Accepted Answer

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

Question 9

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 theseF) A) and C)
G) C) and D) C

Question 10

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)   neverF) A) and B)
G) A) and C) E

Question 11

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?

Accepted Answer

A)     π\piπ +  →\rightarrow→μ\muμ - + v  μ\muμ  
B)     π\piπ +  →\rightarrow→μ\muμ + + ve
C)   + 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? 
A)     \pi +  \rightarrow\mu - + v  \mu   
B)     \pi +  \rightarrow\mu + + ve 
C)     
D)     
E)     \pi +  \rightarrow\mu + + v  \mu   " class="answers-bank-image d-inline" rel="preload" >
D)   + 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? 
A)     \pi +  \rightarrow\mu - + v  \mu   
B)     \pi +  \rightarrow\mu + + ve 
C)     
D)     
E)     \pi +  \rightarrow\mu + + v  \mu   " class="answers-bank-image d-inline" rel="preload" >
E)     π\piπ +  →\rightarrow→μ\muμ + + v  μ\muμ   F) None of the above
G) A) and D)

Question 12

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 theseF) B) and C)
G) C) and D)

Question 13

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 aboveF) B) and C)
G) C) and D)

Question 14

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)   strangenessF) A) and C)
G) B) and C)

Question 15

A particle with spin angular momentum  is called a:

Accepted Answer

A)   lepton
B)   hadron
C)   fermion
D)   boson
E)   electronF) B) and E)
G) A) and B)

Question 16

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 aboveF) C) and D)
G) A) and B)

Question 17

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 gluonsF) B) and D)
G) All of the above

Question 18

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

Accepted Answer

A)   e+
B)    μ\muμ +
C)   ve
D)   + 
B)    \mu + 
C)   ve 
D)     
E)   p " class="answers-bank-image d-inline" rel="preload" >
E)   p F) A) and B)
G) B) and E)

Question 19

The baryon number of a quark is:

Accepted Answer

A)   0
B)   1/2
C)   1/3
D)   2/3
E)   1F) None of the above
G) A) and B)

Question 20

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 pairF) C) and E)
G) A) and B) E

Exam 44: Quarks, Leptons, and the Big Bang

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

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

All leptons interact with each other via the:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Messenger particles of the strong interaction are called:

Correct AnswerverifiedShow Answer

Messenger particles of the weak interaction are called:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

A particle can decay to particles with greater rest mass:

Correct AnswerverifiedE

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Hubble's law is evidence that:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A particle with spin angular momentum is called a:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Color is carried by:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The baryon number of a quark is:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedE

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

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C

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E

$\pi$ ⁺ 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?

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

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E