Question 1

The force between two quarks increases with separation.

Accepted Answer

A) True 
 B)False

Question 2

What happens to the cyclotron frequency of a charged particle if its speed doubles?

Accepted Answer

A) It quadruples. 
B) It triples. 
C) It doubles. 
D) It halves. 
E) It does not change. 
A) It quadruples. 
B) It triples. 
C) It doubles. 
D) It halves. 
E) It does not change.

Question 3

Given that a reaction n + π+ → p can occur and that the quark composition of the neutron is udd and that of the proton is uud, what must be the quark composition of the π+ meson?

Accepted Answer

A) u   
B)    d 
C) d   
D) u   
E) none of the above 
A) u   
B)    d 
C) d   
D) u   
E) none of the above

Question 4

When a quark emits or absorbs a gluon, the quark changes

Accepted Answer

A) its charge. 
B) its mass. 
C) its color. 
D) into an antiquark. 
E) none of the above 
A) its charge. 
B) its mass. 
C) its color. 
D) into an antiquark. 
E) none of the above

Question 5

Is the following decay allowed? π° → μ+ + vμ

Accepted Answer

A) Yes. 
B) No, because charge is not conserved. 
C) No, because mass is created. 
D) No, because lepton number is not conserved. 
A) Yes. 
B) No, because charge is not conserved. 
C) No, because mass is created. 
D) No, because lepton number is not conserved.

Question 6

A quark is

Accepted Answer

A) a constituent of a nucleon. 
B) a constituent of a hadron. 
C) an elementary particle. 
D) all of the given answers. 
A) a constituent of a nucleon. 
B) a constituent of a hadron. 
C) an elementary particle. 
D) all of the given answers.

Question 7

A cyclotron is designed with a magnet that produces 1.2 T. When refurbished, the magnet is replaced by one that produces 1.5 T. How does the kinetic energy developed by the protons change compared to the previous energy developed?

Accepted Answer

A) It increases by 25%. 
B) It decreases by 25%. 
C) It increases by 56%. 
D) It decreases by 56%. 
E) It does not change. 
A) It increases by 25%. 
B) It decreases by 25%. 
C) It increases by 56%. 
D) It decreases by 56%. 
E) It does not change.

Question 8

Which of the following particles is not stable?

Accepted Answer

A) photon 
B) electron 
C) tau neutrino 
D) muon 
E) proton 
A) photon 
B) electron 
C) tau neutrino 
D) muon 
E) proton

Question 9

Which of the following cannot occur?

Accepted Answer

A) π+ → μ+ + vμ 
B) π° → 2γ 
C) π+ + p → K+ + Σ+ 
D) π- + p → n + γ 
E) Σ- → π- + p 
A) π+ → μ+ + vμ 
B) π° → 2γ 
C) π+ + p → K+ + Σ+ 
D) π- + p → n + γ 
E) Σ- → π- + p

Question 10

Which of the following is not considered to be one of the four fundamental forces?

Accepted Answer

A) the gravity force 
B) the meson force 
C) the weak nuclear force 
D) the strong nuclear force 
E) the electromagnetic force 
A) the gravity force 
B) the meson force 
C) the weak nuclear force 
D) the strong nuclear force 
E) the electromagnetic force

Question 11

Consider a particle composed of quarks.
(a) The negative pion is composed of what combination of up and down quarks?
(b) Is the negative pion a baryon or meson?
(c) Is the negative pion a lepton or a hadron?

Accepted Answer

(a) @#IMG-DLM& d
(b)

Question 12

The Feynman diagram shows the weak interaction of a neutrino (ν) and a neutron (n), mediated by a W+ particle. The interaction produces an electron (e-) and another particle. What is the other particle?   FIGURE 43-2

Accepted Answer

A) a positron (e+) 
B) a pion (π+) 
C) a proton (p) 
D) a quark 
E) an anti-neutron 
A) a positron (e+) 
B) a pion (π+) 
C) a proton (p) 
D) a quark 
E) an anti-neutron

Question 13

The quantum of the gravitational force is the

Accepted Answer

A) muon. 
B) graviton. 
C) pion. 
D) quark. 
E) newton. 
A) muon. 
B) graviton. 
C) pion. 
D) quark. 
E) newton.

Question 14

What happens to the cyclotron frequency of a charged particle if the radius of its path doubles?

Accepted Answer

A) It quadruples. 
B) It triples. 
C) It doubles. 
D) It halves. 
E) It does not change. 
A) It quadruples. 
B) It triples. 
C) It doubles. 
D) It halves. 
E) It does not change.

Question 15

Hadrons are divided into two subgroups called

Accepted Answer

A) baryons and leptons. 
B) leptons and mesons. 
C) mesons and baryons. 
D) nucleons and gauge bosons. 
E) mesons and gauge bosons. 
A) baryons and leptons. 
B) leptons and mesons. 
C) mesons and baryons. 
D) nucleons and gauge bosons. 
E) mesons and gauge bosons.

Question 16

If a resonance had a width of 100 keV, what would be the corresponding lifetime associated with the particle?

Accepted Answer

A) 7 × 10-24 s 
B) 7 × 10-21 s 
C) 2 × 10-20 s 
D) 4 × 10-20 s 
E) 7 × 10-23 s 
A) 7 × 10-24 s 
B) 7 × 10-21 s 
C) 2 × 10-20 s 
D) 4 × 10-20 s 
E) 7 × 10-23 s

Question 17

Suppose you were to try to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?

Accepted Answer

A) 1.022 MeV 
B) 12.2 MeV 
C) 1880 MeV 
D) 940 MeV 
E) 223 MeV 
A) 1.022 MeV 
B) 12.2 MeV 
C) 1880 MeV 
D) 940 MeV 
E) 223 MeV

Question 18

The decay: n → p + e- + ve does not occur as it would violate conservation of

Accepted Answer

A) baryon number. 
B) mass. 
C) charge. 
D) lepton number. 
E) angular momentum. 
A) baryon number. 
B) mass. 
C) charge. 
D) lepton number. 
E) angular momentum.

Question 19

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the frequency for the applied alternating voltage?

Accepted Answer

A) 0.26 MHz 
B) 2.6 MHz 
C) 26 MHz 
D) 260 MHz 
E) 2600 MHz 
A) 0.26 MHz 
B) 2.6 MHz 
C) 26 MHz 
D) 260 MHz 
E) 2600 MHz

Question 20

The number of different kinds of leptons, including antiparticles as different, is

Accepted Answer

A) 4. 
B) 6. 
C) 8. 
D) 2. 
E) 12. 
A) 4. 
B) 6. 
C) 8. 
D) 2. 
E) 12.

Exam 43: Elementary Particle

The force between two quarks increases with separation.

What happens to the cyclotron frequency of a charged particle if its speed doubles?

Given that a reaction n + π+ → p can occur and that the quark composition of the neutron is udd and that of the proton is uud, what must be the quark composition of the π+ meson?

When a quark emits or absorbs a gluon, the quark changes

Is the following decay allowed? π° → μ+ + vμ

A quark is

A cyclotron is designed with a magnet that produces 1.2 T. When refurbished, the magnet is replaced by one that produces 1.5 T. How does the kinetic energy developed by the protons change compared to the previous energy developed?

Which of the following particles is not stable?

Which of the following cannot occur?

Which of the following is not considered to be one of the four fundamental forces?

Consider a particle composed of quarks. (a) The negative pion is composed of what combination of up and down quarks? (b) Is the negative pion a baryon or meson? (c) Is the negative pion a lepton or a hadron?

The Feynman diagram shows the weak interaction of a neutrino (ν) and a neutron (n), mediated by a W+ particle. The interaction produces an electron (e-) and another particle. What is the other particle? FIGURE 43-2

The quantum of the gravitational force is the

What happens to the cyclotron frequency of a charged particle if the radius of its path doubles?

Hadrons are divided into two subgroups called

If a resonance had a width of 100 keV, what would be the corresponding lifetime associated with the particle?

Suppose you were to try to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?

The decay: n → p + e- + ve does not occur as it would violate conservation of

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the frequency for the applied alternating voltage?

The number of different kinds of leptons, including antiparticles as different, is

Introduction, Measurement, Estimating

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Filters

Given that a reaction n + π⁺ → p can occur and that the quark composition of the neutron is udd and that of the proton is uud, what must be the quark composition of the π⁺ meson?

Is the following decay allowed? π° → μ⁺ + v_μ

The Feynman diagram shows the weak interaction of a neutrino (ν) and a neutron (n), mediated by a W⁺ particle. The interaction produces an electron (e^-) and another particle. What is the other particle? FIGURE 43-2

The decay: n → p + e^- + v_e does not occur as it would violate conservation of