Question 1

Protons are baryons made up of three quarks.

Accepted Answer

A) True 
 B)False  True

Question 2

Scientists were led to postulate the existence of the neutrino in order to

Accepted Answer

A)   maintain the conservation of energy and of momentum in beta decay.
B)   provide a mechanism for quark production.
C)   account for alpha decay.
D)   explain the intense radiation emitted by quasars. A

Question 3

Which one of the following particles can interact with all 4 of the known forces?

Accepted Answer

A)   muon
B)   anti-proton
C)   electron
D)   neutrino
E)   graviton B

Question 4

The K- meson, with quark composition $ {s }\overline{u} $ , has strangeness number S = +1.

Accepted Answer

A) True 
 B)False

Question 5

A ?+ and ?- at rest annihilate to produce two gamma rays that fly in the opposite directions. What is the wavelength of each gamma ray? The rest energy of a muon is 106 MeV and
H = 6.63 × 10-34 J·s.

Accepted Answer

A)   1.17 × 10-14 m
B)   5.85 × 10-15 m
C)   2.92 × 10-15 m
D)   1.46 × 10-15 m

Question 6

What is the speed of a 2-MeV electron?

Accepted Answer

A)   0.98 c
B)   0.95 c
C)   0.93 c
D)   0.90 c

Question 7

Which of the following is not considered a fundamental particle?

Accepted Answer

A)   alpha particle
B)   beta particle
C)   muon
D)   neutrino

Question 8

What is the minimum energy required to produced a proton-antiproton pair? A proton has a rest mass of 938 MeV/c2.

Accepted Answer

A)   1876 MeV
B)   938 MeV
C)   3752 MeV
D)   2814 MeV

Question 9

How much energy is available when two 30-GeV electrons collide head-on?

Accepted Answer

A)   30 GeV
B)   60 GeV
C)   90 GeV
D)   cannot be determined from the information given

Question 10

What is the speed of a proton with kinetic energy of 2 GeV?

Accepted Answer

A)   0.86 c
B)   0.88 c
C)   0.92 c
D)   0.95 c

Question 11

How far is the galaxy from the Earth if it recedes from Earth at a speed v = 0.5 c ?
(Use H0 = 0.022 m/s · lightyear for Hubble's constant.)

Accepted Answer

A)   22.7 lightyears
B)   7.2 × 108 lightyears
C)   6.8 × 109 lightyears
D)   1.3 × 107 lightyears

Question 12

The rest energy of a Z0 boson is 91 GeV. Using the uncertainty principle, what is the approximate interaction time when it mediates weak interaction? (h = 6.63 × 10-34 J·s)

Accepted Answer

A)   7.2 × 10-27 s
B)   6.7 × 10-26 s
C)   8.5 × 10-29 s
D)   2.6 × 10-27 s

Question 13

The reaction e+ + ?0 ? p + ve is not allowed.

Accepted Answer

A) True 
 B)False

Question 14

A certain galaxy is 2.7 x 109 lightyears from the Earth. How fast is it receding from us?
(Use H0 = 0.022 m/s · lightyear for Hubble's constant.)

Accepted Answer

A)   0.5 c
B)   0.4 c
C)   0.3 c
D)   0.2 c

Question 15

The D+ meson, with quark composition C = +1.
 $ c \bar{d} $ , has charm number

Accepted Answer

A) True 
 B)False

Question 16

How much energy is available when a 30 GeV electron strikes a stationary proton?

Accepted Answer

A)   7.6 GeV
B)   8.2 GeV
C)   8.6 GeV
D)   9.2 GeV)

Question 17

What effect does an increase in the mass of the virtual exchange particle have on the range of the force it mediates?

Accepted Answer

A)   decreases it
B)   increases it
C)   has no appreciable effect
D)   decreases charged particle interactions and increases neutral particle interactions

Question 18

The rest energy of ? meson is about 140 MeV. What is the range of strong force?
(h = 6.63 × 10-34 J·s)

Accepted Answer

A)   0.7 × 10-15 m
B)   1.8 × 10-15 m
C)   1.4 × 10-15 m
D)   2.5 × 10-15 m

Question 19

What is the temperature corresponding to a thermal energy of 50 GeV, the particle energy in the accelerator at SLAC?

Accepted Answer

A)   3.9 × 1011 K
B)   3.9 × 1014 K
C)   7.8 × 1011 K
D)   7.8 × 1014 K

Question 20

The rest energy of W+ boson is about 80 GeV. What is the range of weak interaction?
(h = 6.63 × 10-34 J·s)

Accepted Answer

A)   2.5 × 10-15 m
B)   2.5 × 10-18 m
C)   2.5 × 10-17 m
D)   2.5 × 10-19 m

Exam 9: A Universe of Particles

Protons are baryons made up of three quarks.

Scientists were led to postulate the existence of the neutrino in order to

Which one of the following particles can interact with all 4 of the known forces?

The K^- meson, with quark composition ${s }\overline{u}$ , has strangeness number S = +1.

A ?⁺ and ?^- at rest annihilate to produce two gamma rays that fly in the opposite directions. What is the wavelength of each gamma ray? The rest energy of a muon is 106 MeV and H = 6.63 × 10^-34 J·s.

What is the speed of a 2-MeV electron?

Which of the following is not considered a fundamental particle?

What is the minimum energy required to produced a proton-antiproton pair? A proton has a rest mass of 938 MeV/c².

How much energy is available when two 30-GeV electrons collide head-on?

What is the speed of a proton with kinetic energy of 2 GeV?

How far is the galaxy from the Earth if it recedes from Earth at a speed v = 0.5 c ? (Use H₀ = 0.022 m/s · lightyear for Hubble's constant.)

The rest energy of a Z⁰ boson is 91 GeV. Using the uncertainty principle, what is the approximate interaction time when it mediates weak interaction? (h = 6.63 × 10^-34 J·s)

The reaction e⁺ + ?⁰ ? p + v_e is not allowed.

A certain galaxy is 2.7 x 10⁹ lightyears from the Earth. How fast is it receding from us? (Use H₀ = 0.022 m/s · lightyear for Hubble's constant.)

The D⁺meson, with quark composition C = +1. $c \bar{d}$ , has charm number

How much energy is available when a 30 GeV electron strikes a stationary proton?

What effect does an increase in the mass of the virtual exchange particle have on the range of the force it mediates?

The rest energy of ? meson is about 140 MeV. What is the range of strong force? (h = 6.63 × 10^-34 J·s)

What is the temperature corresponding to a thermal energy of 50 GeV, the particle energy in the accelerator at SLAC?

The rest energy of W⁺ boson is about 80 GeV. What is the range of weak interaction? (h = 6.63 × 10^-34 J·s)

Exam 9: A Universe of Particles

Protons are baryons made up of three quarks.

Scientists were led to postulate the existence of the neutrino in order to

Which one of the following particles can interact with all 4 of the known forces?

The K- meson, with quark composition su‾ {s }\overline{u} su , has strangeness number S = +1.

A ?+ and ?- at rest annihilate to produce two gamma rays that fly in the opposite directions. What is the wavelength of each gamma ray? The rest energy of a muon is 106 MeV and H = 6.63 × 10-34 J·s.

What is the speed of a 2-MeV electron?

Which of the following is not considered a fundamental particle?

What is the minimum energy required to produced a proton-antiproton pair? A proton has a rest mass of 938 MeV/c2.

How much energy is available when two 30-GeV electrons collide head-on?

What is the speed of a proton with kinetic energy of 2 GeV?

How far is the galaxy from the Earth if it recedes from Earth at a speed v = 0.5 c ? (Use H0 = 0.022 m/s · lightyear for Hubble's constant.)

The rest energy of a Z0 boson is 91 GeV. Using the uncertainty principle, what is the approximate interaction time when it mediates weak interaction? (h = 6.63 × 10-34 J·s)

The reaction e+ + ?0 ? p + ve is not allowed.

A certain galaxy is 2.7 x 109 lightyears from the Earth. How fast is it receding from us? (Use H0 = 0.022 m/s · lightyear for Hubble's constant.)

The D+ meson, with quark composition C = +1. cdˉ c \bar{d} cdˉ , has charm number

How much energy is available when a 30 GeV electron strikes a stationary proton?

What effect does an increase in the mass of the virtual exchange particle have on the range of the force it mediates?

The rest energy of ? meson is about 140 MeV. What is the range of strong force? (h = 6.63 × 10-34 J·s)

What is the temperature corresponding to a thermal energy of 50 GeV, the particle energy in the accelerator at SLAC?

The rest energy of W+ boson is about 80 GeV. What is the range of weak interaction? (h = 6.63 × 10-34 J·s)

The K^- meson, with quark composition ${s }\overline{u}$ , has strangeness number S = +1.

A ?⁺ and ?^- at rest annihilate to produce two gamma rays that fly in the opposite directions. What is the wavelength of each gamma ray? The rest energy of a muon is 106 MeV and H = 6.63 × 10^-34 J·s.

What is the minimum energy required to produced a proton-antiproton pair? A proton has a rest mass of 938 MeV/c².

How far is the galaxy from the Earth if it recedes from Earth at a speed v = 0.5 c ? (Use H₀ = 0.022 m/s · lightyear for Hubble's constant.)

The rest energy of a Z⁰ boson is 91 GeV. Using the uncertainty principle, what is the approximate interaction time when it mediates weak interaction? (h = 6.63 × 10^-34 J·s)

The reaction e⁺ + ?⁰ ? p + v_e is not allowed.

A certain galaxy is 2.7 x 10⁹ lightyears from the Earth. How fast is it receding from us? (Use H₀ = 0.022 m/s · lightyear for Hubble's constant.)

The D⁺meson, with quark composition C = +1. $c \bar{d}$ , has charm number

The rest energy of ? meson is about 140 MeV. What is the range of strong force? (h = 6.63 × 10^-34 J·s)

The rest energy of W⁺ boson is about 80 GeV. What is the range of weak interaction? (h = 6.63 × 10^-34 J·s)