Question 1

The scientific community now thinks that

Accepted Answer

A)  the universe was formed in an explosion that took place between 10 and 15 billion years ago. 
B)  new matter is continuously being created in the space between the galaxies. 
C)  the universe is collapsing. 
D)  quasars originated in the nucleus of the Milky Way. 
E)  our Sun is at the center of the universe. 
A)  the universe was formed in an explosion that took place between 10 and 15 billion years ago. 
B)  new matter is continuously being created in the space between the galaxies. 
C)  the universe is collapsing. 
D)  quasars originated in the nucleus of the Milky Way. 
E)  our Sun is at the center of the universe.

Question 2

Which of the following combination of quarks represents a meson? 1)   2)   3)   4)   5)   6)

Accepted Answer

A)  1, 2, 4, 5 
B)  1, 3, 5 
C)  3, 6 
D)  2, 4, 5 
E)  2, 3, 4, 6 
A)  1, 2, 4, 5 
B)  1, 3, 5 
C)  3, 6 
D)  2, 4, 5 
E)  2, 3, 4, 6

Question 3

There is evidence that the universe is expanding like a loaf of raisin bread baking in an oven. This means that

Accepted Answer

A)  some clusters of galaxies are not getting farther away from other clusters of galaxies. 
B)  the expansion looks different from each cluster of galaxies. 
C)  the expansion looks the same from each cluster of galaxies. 
D)  we should be able to determine the location of the center of the expansion. 
E)  the universe will eventually collapse. 
A)  some clusters of galaxies are not getting farther away from other clusters of galaxies. 
B)  the expansion looks different from each cluster of galaxies. 
C)  the expansion looks the same from each cluster of galaxies. 
D)  we should be able to determine the location of the center of the expansion. 
E)  the universe will eventually collapse.

Question 4

The distance to a particular galaxy is 60 million light years. If you assume Hubble's constant to be 23 km/s/106 ly, then what redshift recession velocity would you expect to measure?

Accepted Answer

A)  zero 
B)  1.4 × 103 km/s 
C)  2.6 × 103 km/s 
D)  0.38 × 103 km/s 
E)  None of these is correct. 
A)  zero 
B)  1.4 × 103 km/s 
C)  2.6 × 103 km/s 
D)  0.38 × 103 km/s 
E)  None of these is correct.

Question 5

Which of the following statements about particles and their interactions is true?

Accepted Answer

A)  All particles that carry electric charge participate in the electromagnetic interaction. 
B)  All particles participate in gravity. 
C)  Some particles participate in all four interactions, whereas others participate in only some of them. 
D)  The strong nuclear interaction is mediated by gluons. 
E)  All of these are correct. 
A)  All particles that carry electric charge participate in the electromagnetic interaction. 
B)  All particles participate in gravity. 
C)  Some particles participate in all four interactions, whereas others participate in only some of them. 
D)  The strong nuclear interaction is mediated by gluons. 
E)  All of these are correct.

Question 6

The reaction  - ? e- +   +   conserves

Accepted Answer

A)  baryon numbers. 
B)  lepton numbers. 
C)  neutrino numbers. 
D)  particle numbers. 
E)  All of the above. 
A)  baryon numbers. 
B)  lepton numbers. 
C)  neutrino numbers. 
D)  particle numbers. 
E)  All of the above.

Question 7

What is baryon number and electric charge in units of e) for the three-quark combination uds?

Accepted Answer

A)  1, 0 
B)  1, -1 
C)  1, +1 
D)  1, +2 
E)  None of the above. 
A)  1, 0 
B)  1, -1 
C)  1, +1 
D)  1, +2 
E)  None of the above.

Question 8

With a microscope using photons you locate an electron in an atom to within a distance of 0.010 nm. An alternate statement of the uncertainty principle involves relationship between position $\Delta$x) and momentum $\Delta$p) uncertainties in the form   . The uncertainty in the momentum of the electron is approximately

Accepted Answer

A)  1.1 * 10-24 N • s. 
B)  5.3 * 10-27 N • s. 
C)  5.3 *10-24 N • s. 
D)  4.2* 10-24 N • s. 
E)  1.1 * 10-23 N • s. 
A)  1.1 * 10-24 N • s. 
B)  5.3 * 10-27 N • s. 
C)  5.3 *10-24 N • s. 
D)  4.2* 10-24 N • s. 
E)  1.1 * 10-23 N • s.

Question 9

The numbers L = +1 and B = -1 describe

Accepted Answer

A)  a particle other than a lepton or a baryon. 
B)  a lepton and an antibaryon. 
C)  an antilepton and a baryon. 
D)  an antilepton and an antibaryon. 
E)  a lepton and a baryon. 
A)  a particle other than a lepton or a baryon. 
B)  a lepton and an antibaryon. 
C)  an antilepton and a baryon. 
D)  an antilepton and an antibaryon. 
E)  a lepton and a baryon.

Question 10

The Stanford Linear Accelerator Center SLAC) can accelerate electrons to an energy of 50 GeV. The wavelength of these electrons is of the order

Accepted Answer

A)  0.2 fm. 
B)  0.02 fm. 
C)  0.002 fm. 
D)  0.006 fm. 
E)  0.008 fm. 
A)  0.2 fm. 
B)  0.02 fm. 
C)  0.002 fm. 
D)  0.006 fm. 
E)  0.008 fm.

Question 11

Hadrons are thought to be

Accepted Answer

A)  without structure. 
B)  composed of quarks. 
C)  composed of electrons. 
D)  responsible for the gravitational interaction. 
E)  extremely stable particles. 
A)  without structure. 
B)  composed of quarks. 
C)  composed of electrons. 
D)  responsible for the gravitational interaction. 
E)  extremely stable particles.

Question 12

How far is a galaxy from Earth if it is receding from Earth at a speed of 0.1c?

Accepted Answer

A)  3.1 × 1020 m 
B)  1.3 × 1022 m 
C)  1.3 × 1025 m 
D)  3.4 × 1028 m 
E)  1.3 × 1030 m 
A)  3.1 × 1020 m 
B)  1.3 × 1022 m 
C)  1.3 × 1025 m 
D)  3.4 × 1028 m 
E)  1.3 × 1030 m

Question 13

At the present time, the truly elementary particles are thought to be the

Accepted Answer

A)  quarks and leptons. 
B)  hadrons and baryons. 
C)  baryons and quarks. 
D)  leptons and hadrons. 
E)  quarks and photons. 
A)  quarks and leptons. 
B)  hadrons and baryons. 
C)  baryons and quarks. 
D)  leptons and hadrons. 
E)  quarks and photons.

Question 14

The charge of the s quark is

Accepted Answer

A)  e. 
B)  -1/3)e. 
C)  2/3)e. 
D)  -2/3)e. 
E)  1/3)e. 
A)  e. 
B)  -1/3)e. 
C)  2/3)e. 
D)  -2/3)e. 
E)  1/3)e.

Question 15

Particles that decay via the weak interaction have lifetimes of the order of

Accepted Answer

A)  10-10 s. 
B)  10-15 s. 
C)  10-20 s. 
D)  10-23 s. 
E)  10-27 s. 
A)  10-10 s. 
B)  10-15 s. 
C)  10-20 s. 
D)  10-23 s. 
E)  10-27 s.

Question 16

In quantum electrodynamics QED), the electromagnetic field is described in terms of

Accepted Answer

A)  the interaction of electrons. 
B)  hadrons. 
C)  action at a distance. 
D)  the weak nuclear interaction. 
E)  the interaction of photons. 
A)  the interaction of electrons. 
B)  hadrons. 
C)  action at a distance. 
D)  the weak nuclear interaction. 
E)  the interaction of photons.

Question 17

Hubble's law can be interpreted to tell us the approximate

Accepted Answer

A)  angular speed of the Milky Way. 
B)  temperature of our Sun. 
C)  force of gravity at any point in space. 
D)  age of the universe. 
E)  mass of Earth. 
A)  angular speed of the Milky Way. 
B)  temperature of our Sun. 
C)  force of gravity at any point in space. 
D)  age of the universe. 
E)  mass of Earth.

Question 18

A possible explanation for the fact that an isolated quark has yet to be found is that

Accepted Answer

A)  the force between quarks varies inversely with their separation. 
B)  the potential energy of the quarks decreases with their separation. 
C)  the force between quarks is independent of their separation. 
D)  the force between quarks varies inversely with the square of their separation. 
E)  None of these is correct. 
A)  the force between quarks varies inversely with their separation. 
B)  the potential energy of the quarks decreases with their separation. 
C)  the force between quarks is independent of their separation. 
D)  the force between quarks varies inversely with the square of their separation. 
E)  None of these is correct.

Question 19

In the present understanding of the behavior of elementary particles, the term color is used to denote

Accepted Answer

A)  the wavelengths of various $\gamma$rays emitted by the particles. 
B)  a property responsible for the strong forces between quarks. 
C)  a property that distinguishes between protons and neutrons. 
D)  a property that only leptons can possess. 
E)  nothing. 
A)  the wavelengths of various $\gamma$rays emitted by the particles. 
B)  a property responsible for the strong forces between quarks. 
C)  a property that distinguishes between protons and neutrons. 
D)  a property that only leptons can possess. 
E)  nothing.

Exam 28: Particle Physics

The scientific community now thinks that

Which of the following combination of quarks represents a meson? 1) 2) 3) 4) 5) 6)

There is evidence that the universe is expanding like a loaf of raisin bread baking in an oven. This means that

The distance to a particular galaxy is 60 million light years. If you assume Hubble's constant to be 23 km/s/106 ly, then what redshift recession velocity would you expect to measure?

Which of the following statements about particles and their interactions is true?

The reaction - ? e- + + conserves

What is baryon number and electric charge in units of e) for the three-quark combination uds?

The numbers L = +1 and B = -1 describe

The Stanford Linear Accelerator Center SLAC) can accelerate electrons to an energy of 50 GeV. The wavelength of these electrons is of the order

Hadrons are thought to be

How far is a galaxy from Earth if it is receding from Earth at a speed of 0.1c?

At the present time, the truly elementary particles are thought to be the

The charge of the s quark is

Particles that decay via the weak interaction have lifetimes of the order of

In quantum electrodynamics QED), the electromagnetic field is described in terms of

Hubble's law can be interpreted to tell us the approximate

A possible explanation for the fact that an isolated quark has yet to be found is that

In the present understanding of the behavior of elementary particles, the term color is used to denote

Introduction to Physics

Linear Motion

Motion in Two and Three Dimensions

Forces and Motion I: Newtons Laws

Forces and Motion II: Applications

Work and Energy

Momentum, Collisions, and the Center of Mass

Rotational Motion

Elastic Properties of Matter: Stress and Strain

Gravitation

Fluids

Oscillations

Waves

Thermodynamics I

Thermodynamics II

Electrostatics I: Electric Charge, Forces, and Fields

Electrostatics II: Electric Potential Energy and Electric Potential

Electric Charges in Motion

Magnetism

Electromagnetic Induction

Alternating-Current Circuits

Electromagnetic Waves

Wave Properties of Light

Geometrical Optics

Relativity

Quantum Physics and Atomic Structure

Nuclear Physics

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The distance to a particular galaxy is 60 million light years. If you assume Hubble's constant to be 23 km/s/10⁶ ly, then what redshift recession velocity would you expect to measure?

The reaction ^- ? e^-+ + conserves