Question 1

The charge of the u 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 C

Question 2

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. B

Question 3

Which of the following are possible combinations of quarks?

Accepted Answer

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

Question 4

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

Accepted Answer

A)  a particle other than a lepton, a baryon, or an antibaryon. 
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, a baryon, or an antibaryon. 
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 5

According to the standard model,

Accepted Answer

A)  the four forces of nature existed from the moment of the Big Bang. 
B)  energy in the form of radiation still dominates in the universe. 
C)  the four forces of nature were initially unified into a single force. 
D)  stable atomic nuclei formed in less than 0.01 s. 
E)  the universe was initially very cold and dense. 
A)  the four forces of nature existed from the moment of the Big Bang. 
B)  energy in the form of radiation still dominates in the universe. 
C)  the four forces of nature were initially unified into a single force. 
D)  stable atomic nuclei formed in less than 0.01 s. 
E)  the universe was initially very cold and dense.

Question 6

The Coulomb force in the classical sense is understood in terms of electric fields. However, in quantum mechanics, the Coulomb force is described in terms of exchange of virtual photons between the charged particles. Why doesn't the creation of the virtual photons violate the principle of conservation of energy?

Accepted Answer

A)  This is because in quantum mechanics energy is not conserved. 
B)  The uncertainty principle,   allows photons to be created provided they are absorbed within the time interval $\Delta$t. 
C)  The photons do not have any energy since they are massless. 
D)  The virtual photons are not real photons and hence do not carry any energy. 
E)  None of these is correct. 
A)  This is because in quantum mechanics energy is not conserved. 
B)  The uncertainty principle,   allows photons to be created provided they are absorbed within the time interval $\Delta$t. 
C)  The photons do not have any energy since they are massless. 
D)  The virtual photons are not real photons and hence do not carry any energy. 
E)  None of these is correct.

Question 7

An antiproton is an atomic particle that has

Accepted Answer

A)  the mass of a proton and the charge of an electron. 
B)  the mass of an electron and the charge of a proton. 
C)  the mass of a neutron and the charge of a proton. 
D)  the mass of a proton and the charge of a neutron. 
E)  the mass of an electron and the charge of a positron. 
A)  the mass of a proton and the charge of an electron. 
B)  the mass of an electron and the charge of a proton. 
C)  the mass of a neutron and the charge of a proton. 
D)  the mass of a proton and the charge of a neutron. 
E)  the mass of an electron and the charge of a positron.

Question 8

The field quanta associated with the hadronic force between quarks are called

Accepted Answer

A)  photons 
B)  gravitons 
C)  GUTs 
D)  gluons 
E)  vector bosons 
A)  photons 
B)  gravitons 
C)  GUTs 
D)  gluons 
E)  vector bosons

Question 9

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

Accepted Answer

A)  3.0 * 1020 m 
B)  1.0 * 1022 m 
C)  1.2 * 1025 m 
D)  3.0 * 1028 m 
E)  1.0 *1030 m 
A)  3.0 * 1020 m 
B)  1.0 * 1022 m 
C)  1.2 * 1025 m 
D)  3.0 * 1028 m 
E)  1.0 *1030 m

Question 10

The distance to a particular galaxy is 60 million light years. If you assume Hubble's constant to be 23 km/s/106 c · y, 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 11

Which of the following choices lists the four known types of forces in nature in order of decreasing strength?

Accepted Answer

A)  strong nuclear, electromagnetic, weak nuclear, gravitational 
B)  electromagnetic, strong nuclear, weak nuclear, gravitational 
C)  strong nuclear, gravitational, weak nuclear, electromagnetic 
D)  strong nuclear, weak nuclear, electromagnetic, gravitational 
E)  strong nuclear, electromagnetic, gravitational, weak nuclear 
A)  strong nuclear, electromagnetic, weak nuclear, gravitational 
B)  electromagnetic, strong nuclear, weak nuclear, gravitational 
C)  strong nuclear, gravitational, weak nuclear, electromagnetic 
D)  strong nuclear, weak nuclear, electromagnetic, gravitational 
E)  strong nuclear, electromagnetic, gravitational, weak nuclear

Question 12

Redshift measurements of a galaxy yield a recession of 1000 km/s. Hubble's constant H is 23 km/s/106 c·y. The distance to the galaxy is approximately

Accepted Answer

A)  23 * 106 c·y 
B)  37 *106 c·y 
C)  44 * 106 c·y 
D)  52 * 106 c·y 
E)  61 * 106 c·y 
A)  23 * 106 c·y 
B)  37 *106 c·y 
C)  44 * 106 c·y 
D)  52 * 106 c·y 
E)  61 * 106 c·y

Question 13

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 14

The conservation law violated by the reaction p $\rightarrow$  $\pi$0 + e+ is the conservation of

Accepted Answer

A)  charge. 
B)  energy. 
C)  linear momentum. 
D)  lepton number and baryon number. 
E)  angular momentum. 
A)  charge. 
B)  energy. 
C)  linear momentum. 
D)  lepton number and baryon number. 
E)  angular momentum.

Question 15

Forces between electrons or positrons and nucleons that result in beta decay are best understood in terms of

Accepted Answer

A)  the strong nuclear (hadronic) interaction. 
B)  the electromagnetic interaction. 
C)  the weak nuclear interaction. 
D)  the gravitational interaction. 
E)  None of these is correct. 
A)  the strong nuclear (hadronic) interaction. 
B)  the electromagnetic interaction. 
C)  the weak nuclear interaction. 
D)  the gravitational interaction. 
E)  None of these is correct.

Question 16

Virtual photons are particles that mediate the Coulomb force and travel at the speed of light. What is the approximate energy of the virtual photons that mediate between the electron in the ground state and proton in a hydrogen atom? The radius of the electron in the ground state is 0.053 nm.

Accepted Answer

A)  100 eV 
B)  500 eV 
C)  1000 eV 
D)  4 keV 
E)  0.5 MeV 
A)  100 eV 
B)  500 eV 
C)  1000 eV 
D)  4 keV 
E)  0.5 MeV

Question 17

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

Accepted Answer

A)  1, 0, 1 
B)  1, -1, 1 
C)  1, +1, -1 
D)  1, +1, 1 
E)  none of the above 
A)  1, 0, 1 
B)  1, -1, 1 
C)  1, +1, -1 
D)  1, +1, 1 
E)  none of the above

Question 18

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

Accepted Answer

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

Question 19

A classical calculation shows that the critical mass density of the universe is given by   where H is the Hubble constant and G is the gravitation constant. If the density is below this value, the universe will expand forever whereas if it is above this value the universe will eventually stop expanding and collapses. Approximately, how many hydrogen atoms per m3 is the critical density equivalent to?

Accepted Answer

A)  4 
B)  40 
C)  400 
D)  4000 
E)  40,000 
A)  4 
B)  40 
C)  400 
D)  4000 
E)  40,000

Question 20

Hubble's Law relates the speed of a galaxy from its distance to us. If you assume Hubble's constant to be 23 km/s/106 c · y, then what is the distance of a galaxy that is traveling at 10% the speed of light away from us?

Accepted Answer

A)  It is not possible for a galaxy to travel so fast! 
B)  1.3* 1010 c · y 
C)  1.3 * 109 c · y 
D)  1.3 * 1011 c · y 
E)  1.3* 108 c · y 
A)  It is not possible for a galaxy to travel so fast! 
B)  1.3* 1010 c · y 
C)  1.3 * 109 c · y 
D)  1.3 * 1011 c · y 
E)  1.3* 108 c · y

The charge of the u quark is

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

Which of the following are possible combinations of quarks?

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

According to the standard model,

An antiproton is an atomic particle that has

The field quanta associated with the hadronic force between quarks are called

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

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

Which of the following choices lists the four known types of forces in nature in order of decreasing strength?

Redshift measurements of a galaxy yield a recession of 1000 km/s. Hubble's constant H is 23 km/s/10⁶ c·y. The distance to the galaxy is approximately

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

The conservation law violated by the reaction p $\rightarrow$ $\pi$ ⁰ + e⁺ is the conservation of

Forces between electrons or positrons and nucleons that result in beta decay are best understood in terms of

Virtual photons are particles that mediate the Coulomb force and travel at the speed of light. What is the approximate energy of the virtual photons that mediate between the electron in the ground state and proton in a hydrogen atom? The radius of the electron in the ground state is 0.053 nm.

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

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

Hubble's Law relates the speed of a galaxy from its distance to us. If you assume Hubble's constant to be 23 km/s/10⁶ c · y, then what is the distance of a galaxy that is traveling at 10% the speed of light away from us?

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Filters

Exam 21: Elementary Particles and the Beginning of the Universe

The charge of the u quark is

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

Which of the following are possible combinations of quarks?

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

According to the standard model,

An antiproton is an atomic particle that has

The field quanta associated with the hadronic force between quarks are called

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

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

Which of the following choices lists the four known types of forces in nature in order of decreasing strength?

Redshift measurements of a galaxy yield a recession of 1000 km/s. Hubble's constant H is 23 km/s/106 c·y. The distance to the galaxy is approximately

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

The conservation law violated by the reaction p →\rightarrow→ π\piπ 0 + e+ is the conservation of

Forces between electrons or positrons and nucleons that result in beta decay are best understood in terms of

Virtual photons are particles that mediate the Coulomb force and travel at the speed of light. What is the approximate energy of the virtual photons that mediate between the electron in the ground state and proton in a hydrogen atom? The radius of the electron in the ground state is 0.053 nm.

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

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

Hubble's Law relates the speed of a galaxy from its distance to us. If you assume Hubble's constant to be 23 km/s/106 c · y, then what is the distance of a galaxy that is traveling at 10% the speed of light away from us?

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Filters

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

Redshift measurements of a galaxy yield a recession of 1000 km/s. Hubble's constant H is 23 km/s/10⁶ c·y. The distance to the galaxy is approximately

The conservation law violated by the reaction p $\rightarrow$ $\pi$ ⁰ + e⁺ is the conservation of

Hubble's Law relates the speed of a galaxy from its distance to us. If you assume Hubble's constant to be 23 km/s/10⁶ c · y, then what is the distance of a galaxy that is traveling at 10% the speed of light away from us?