Question 1

Which of the following can occur?

Accepted Answer

A)  π+ → μ+ + vμ
B)  p + n → p + p + + → μ+ + vμ 
B)  p + n → p + p +   
C)  K+ → π° 
D)  μ- → e- + ve + vμ 
E)  K+ → 2π°" class="answers-bank-image d-inline" rel="preload" >
C)  K+ → π°
D)  μ- → e- + ve + vμ
E)  K+ → 2π°F) D) and E)
G) A) and B)

Question 2

Composite particles that are composed of a quark and antiquark pair are called

Accepted Answer

A)  leptons.
B)  hadrons.
C)  mesons.
D)  bosons.
E)  baryons.F) B) and E)
G) C) and E)

Question 3

What is the wavelength of a 20-GeV alpha particle?

Accepted Answer

A)  0.25 fm
B)  0.063 fm
C)  0.099 fm
D)  less than 10-18 m
E)  0.50 fmF) C) and D)
G) B) and D)

Question 4

The voltage across the dees of a cyclotron is 30,000 V. How many revolutions do the protons go through in reaching 21 MeV kinetic energy?

Accepted Answer

A)  more than 2 x 106
B)  1400
C)  700
D)  350
E)  35F) C) and D)
G) None of the above

Question 5

What combination of quarks produces a proton and what are the electric charges on these quarks, expressed in terms of e?

Accepted Answer

uud, with ...

Question 6

The exchange particles for the weak force are very massive (about 100 times as massive as a proton) . This would lead one to expect that the weak force would

Accepted Answer

A)  act over a very long range.
B)  act over a very short range.
C)  only act on very massive particles.
D)  only act on very light particles.
E)  be transmitted at the speed of light.F) A) and E)
G) A) and C)

Question 7

Scientists hope that some day they will be able to produce a theory which will combine the strong force, the weak nuclear force, and electromagnetism. This theory has been called

Accepted Answer

A)  The Grand Unified Theory.
B)  The Theory of Everything.
C)  The Unified Field Theory.
D)  The Electroweak Theory.
E)  The Electrostrong Theory.F) B) and C)
G) A) and B)

Question 8

The Feynman diagram shows two electrons approaching each other, interacting, and then leaving each other. What particle is being exchanged during the interaction?  FIGURE 43-1

Accepted Answer

A)  pion
B)  meson
C)  virtual photon
D)  neutrino
E)  W particleF) A) and B)
G) A) and C)

Question 9

What is the quark composition of a Λ°?

Accepted Answer

A)  uud
B)  uus
C)  uds
D)  uss
E)  uddF) C) and D)
G) B) and E)

Question 10

What combination of quarks produces a neutron and what are the electric charges on these quarks, expressed in terms of e?

Accepted Answer

udd, with ...

Question 11

The color charge of leptons is

Accepted Answer

A)  violet.
B)  red.
C)  blue.
D)  zero.
E)  green.F) A) and B)
G) B) and D)

Question 12

What is the charge, baryon number, and minimum angular momentum for the udd combination of quarks?

Accepted Answer

A)  1, 0, 
B)  0, 1, 
C)  1, 1, 
D)  0, 0, 0
E)  0, 0, F) C) and E)
G) B) and D)

Question 13

Quarks can only have a charge of +(2/3)e or -(1/3)e, while antiquarks can only have charges of -(2/3)e or +(1/3)e.

Accepted Answer

A) True 
 B)False

Question 14

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotron?

Accepted Answer

A)  3.7 keV
B)  7.8 keV
C)  8.7 keV
D)  7.8 MeV
E)  8.7 MeVF) All of the above
G) C) and E)

Question 15

The number of quarks in a deuteron (2H)  is

Accepted Answer

A)  1.
B)  2.
C)  3.
D)  4.
E)  6.F) All of the above
G) A) and D)

Question 16

The reaction p + + + γ is not possible because A) angular momentum cannot be conserved in such a reaction. B) baryon number is not conserved in such a reaction. C) lepton number is not conserved in such a reaction. D) charge is not conserved in such a reaction. E) The statement is not true; the reaction is possible." class="answers-bank-image d-inline" rel="preload" > → e+ + γ is not possible because

Accepted Answer

A)  angular momentum cannot be conserved in such a reaction.
B)  baryon number is not conserved in such a reaction.
C)  lepton number is not conserved in such a reaction.
D)  charge is not conserved in such a reaction.
E)  The statement is not true; the reaction is possible.F) All of the above
G) D) and E)

Question 17

The strong nuclear force acts only on neutral particles.

Accepted Answer

A) True 
 B)False

Question 18

The π+ meson composition by quarks is

Accepted Answer

A)  ud.
B)   + meson composition by quarks is 
A)  ud. 
B)     d. 
C)  u   . 
D)       . 
E)  none of the above" class="answers-bank-image d-inline" rel="preload" > d.
C)  u + meson composition by quarks is 
A)  ud. 
B)     d. 
C)  u   . 
D)       . 
E)  none of the above" class="answers-bank-image d-inline" rel="preload" > .
D)   + meson composition by quarks is 
A)  ud. 
B)     d. 
C)  u   . 
D)       . 
E)  none of the above" class="answers-bank-image d-inline" rel="preload" >+ meson composition by quarks is 
A)  ud. 
B)     d. 
C)  u   . 
D)       . 
E)  none of the above" class="answers-bank-image d-inline" rel="preload" > .
E)  none of the aboveF) D) and E)
G) A) and B)

Question 19

Composite particles that are composed of three quarks are called

Accepted Answer

A)  leptons.
B)  hadrons.
C)  mesons.
D)  bosons.
E)  baryons.F) A) and B)
G) A) and C)

Question 20

Which of the following combinations of quarks can form a particle with a unit charge, a baryon number of zero, and a minimum angular momentum of zero?

Accepted Answer

A)  u 
B)  udd
C)    d
D)  uud
E)  udF) A) and D)
G) A) and C)

Exam 43: Elementary Particle

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotron?

Correct AnswerverifiedShow Answer

Which of the following can occur?

Correct AnswerverifiedShow Answer

What is the charge, baryon number, and minimum angular momentum for the udd combination of quarks?

Correct AnswerverifiedShow Answer

The voltage across the dees of a cyclotron is 30,000 V. How many revolutions do the protons go through in reaching 21 MeV kinetic energy?

Correct AnswerverifiedShow Answer

The strong nuclear force acts only on neutral particles.

Correct AnswerverifiedShow Answer

The Feynman diagram shows two electrons approaching each other, interacting, and then leaving each other. What particle is being exchanged during the interaction? FIGURE 43-1

Correct AnswerverifiedShow Answer

The π+ meson composition by quarks is

Correct AnswerverifiedShow Answer

Quarks can only have a charge of +(2/3)e or -(1/3)e, while antiquarks can only have charges of -(2/3)e or +(1/3)e.

Correct AnswerverifiedShow Answer

Composite particles that are composed of three quarks are called

Correct AnswerverifiedShow Answer

What combination of quarks produces a neutron and what are the electric charges on these quarks, expressed in terms of e?

Correct Answerverifiedudd, with ...View AnswerShow Answer

What combination of quarks produces a proton and what are the electric charges on these quarks, expressed in terms of e?

Correct Answerverifieduud, with ...View AnswerShow Answer

Which of the following combinations of quarks can form a particle with a unit charge, a baryon number of zero, and a minimum angular momentum of zero?

Correct AnswerverifiedShow Answer

What is the wavelength of a 20-GeV alpha particle?

Correct AnswerverifiedShow Answer

The exchange particles for the weak force are very massive (about 100 times as massive as a proton) . This would lead one to expect that the weak force would

Correct AnswerverifiedShow Answer

The color charge of leptons is

Correct AnswerverifiedShow Answer

What is the quark composition of a Λ°?

Correct AnswerverifiedShow Answer

Composite particles that are composed of a quark and antiquark pair are called

Correct AnswerverifiedShow Answer

The number of quarks in a deuteron (2H) is

Correct AnswerverifiedShow Answer

The reaction p + → e+ + γ is not possible because

Correct AnswerverifiedShow Answer

Scientists hope that some day they will be able to produce a theory which will combine the strong force, the weak nuclear force, and electromagnetism. This theory has been called

Correct AnswerverifiedShow Answer

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The π⁺ meson composition by quarks is

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udd, with ...
View Answer

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uud, with ...
View Answer

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The number of quarks in a deuteron (²H) is

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The reaction p + → e⁺ + γ is not possible because

Correct Answer
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Correct Answer
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