Question 1

Of the following leptons, which has the greatest rest energy?

Accepted Answer

A)    
B)    
C)    
D)  $v_{e}$ 
E)  $\boldsymbol{v}_{\mu}$ 
A)    
B)    
C)    
D)  $v_{e}$ 
E)  $\boldsymbol{v}_{\mu}$

Question 2

Which of the following decays violates conservation of lepton number?

Accepted Answer

A)  $\mu^{-} \rightarrow \mathrm{e}^{-}+\overline{\boldsymbol{v}}_{e}$ 
B)    
C)    
D)    
E)    
A)  $\mu^{-} \rightarrow \mathrm{e}^{-}+\overline{\boldsymbol{v}}_{e}$ 
B)    
C)    
D)    
E)

Question 3

If the quark content of the proton, p, is uud, the quark content of the antiproton, is: $\bar{p}$

Accepted Answer

A) uud. 
B) udd. 
C)    
D)    
E)    
A) uud. 
B) udd. 
C)    
D)    
E)

Question 4

A photon with an energy of E$\gamma$ = 2.0900 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV.What is the kinetic energy of the antiproton? (mpc2 = 938.3 MeV)

Accepted Answer

The answer of A photon with an energy of E$\gamma$...

Question 5

Which of the following particle reactions cannot occur?

Accepted Answer

A) p + p $\rightarrow$ p + p + p + $\bar{p}$ 
B) p + $\rightarrow$ 2$\gamma$ $\bar{p}$ 
C) ($\pi$+ + p $\rightarrow$K+ + $\Sigma$+) 
D) ($\gamma$ + p $\rightarrow$ n + $\pi$0) 
E) (e-+ e+ $\rightarrow$2$\gamma$) 
A) p + p $\rightarrow$ p + p + p + $\bar{p}$ 
B) p + $\rightarrow$ 2$\gamma$ $\bar{p}$ 
C) ($\pi$+ + p $\rightarrow$K+ + $\Sigma$+) 
D) ($\gamma$ + p $\rightarrow$ n + $\pi$0) 
E) (e-+ e+ $\rightarrow$2$\gamma$)

Question 6

In the standard model of the expansion of the universe, the total energy of a standard mass m is assumed to be zero.When we solve the resulting energy equation for the critical mass density of the universe, we find that the critical mass density is given by:

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 7

Which of the following reactions violates conservation of strangeness?

Accepted Answer

A) ( $\Omega$ - $\rightarrow$ 3$\gamma$) 
B)  $\overline{\mathrm{p}}+\mathrm{p} \rightarrow \mathrm{~A}^{\circ}+\overline{\mathrm{A}}^{0}$ 
C)  $\overline{\mathrm{n}} \rightarrow \mathrm{e}^{+}+\overline{\mathrm{p}}+\boldsymbol{v}_{0}$ 
D)  $\mathrm{e}^{+}+\mathrm{e}^{-} \rightarrow 2 \gamma$ 
E)  $\bar{p}+\pi^{-} \rightarrow K^{\circ}+A^{\circ}$ 
A) ( $\Omega$ - $\rightarrow$ 3$\gamma$) 
B)  $\overline{\mathrm{p}}+\mathrm{p} \rightarrow \mathrm{~A}^{\circ}+\overline{\mathrm{A}}^{0}$ 
C)  $\overline{\mathrm{n}} \rightarrow \mathrm{e}^{+}+\overline{\mathrm{p}}+\boldsymbol{v}_{0}$ 
D)  $\mathrm{e}^{+}+\mathrm{e}^{-} \rightarrow 2 \gamma$ 
E)  $\bar{p}+\pi^{-} \rightarrow K^{\circ}+A^{\circ}$

Question 8

An electron and a positron (antielectron), both nearly at rest, collide.What particle(s) is(are) produced?

Accepted Answer

A) One photon of energy 1.02 MeV 
B) Two photons of energy 511 keV 
C) A pi-meson 
D) A K-meson and an anti-neutrino 
A) One photon of energy 1.02 MeV 
B) Two photons of energy 511 keV 
C) A pi-meson 
D) A K-meson and an anti-neutrino

Question 9

The particle reaction cannot occur because: $\pi^{+}+p \rightarrow \Sigma^{+}+\pi^{0}$

Accepted Answer

A) electric charge is not conserved. 
B) strangeness is not conserved. 
C) baryon number is not conserved. 
D) all of the above are not conserved. 
E) both (a) and (b) above are not conserved. 
A) electric charge is not conserved. 
B) strangeness is not conserved. 
C) baryon number is not conserved. 
D) all of the above are not conserved. 
E) both (a) and (b) above are not conserved.

Question 10

The three quarks in any baryon must all have different:

Accepted Answer

A) baryon number. 
B) colour charge. 
C) electric charge. 
D) lepton number. 
E) spin. 
A) baryon number. 
B) colour charge. 
C) electric charge. 
D) lepton number. 
E) spin.

Question 11

According to string theory, six space-time dimensions cannot be measured except as quantum numbers of internal particle properties because they are curled up in size of the order of:

Accepted Answer

A) 10-35 m. 
B) 10-15 m. 
C) 10-10 m. 
D) 10-8 m. 
E) 10-3 m. 
A) 10-35 m. 
B) 10-15 m. 
C) 10-10 m. 
D) 10-8 m. 
E) 10-3 m.

Question 12

Which one of the following is not true of neutrinos?

Accepted Answer

A) They have no charge. 
B) They have no spin. 
C) One type of neutrino may change into another type of neutrino. 
D) They are leptons. 
E) They do not take part in strong nuclear interactions. 
A) They have no charge. 
B) They have no spin. 
C) One type of neutrino may change into another type of neutrino. 
D) They are leptons. 
E) They do not take part in strong nuclear interactions.

Question 13

The rest-energy of the Z0 boson is 96 GeV.Using this information, find the maximum length of time a virtual Z0 can exist, in accordance with the uncertainty principle .(1 eV = 1.6 * 10-19 J.) $\Delta E \Delta t=h / 2$

Accepted Answer

A) 3.4 *10-27 s 
B) 7.5 * 10-30 s 
C) 2.4*10-24 s 
D) 1.9 * 10-21 s 
E) 6.3 * 10-5 s 
A) 3.4 *10-27 s 
B) 7.5 * 10-30 s 
C) 2.4*10-24 s 
D) 1.9 * 10-21 s 
E) 6.3 * 10-5 s

Question 14

The omega-minus particle decays with the X0 and the  $\pi$- eventually decaying into stable baryon(s) and lepton(s).Utilising conservation laws, which of the following is the correct accounting of the decay products? $\Omega^{-} \rightarrow X^{0}+\pi^{-}$

Accepted Answer

A)  $\Omega^{-} \rightarrow \mathrm{p}+4 \gamma+2 \mathrm{e}^{-}+2 \bar{v}_{e}+\boldsymbol{v}_{\mu}+\bar{v}_{\mu}$ 
B)  $\Omega^{-} \rightarrow \mathrm{p}+\mu^{-}+\bar{v}_{\mu}+2 \gamma+e^{-}$ 
C)    
D)    
A)  $\Omega^{-} \rightarrow \mathrm{p}+4 \gamma+2 \mathrm{e}^{-}+2 \bar{v}_{e}+\boldsymbol{v}_{\mu}+\bar{v}_{\mu}$ 
B)  $\Omega^{-} \rightarrow \mathrm{p}+\mu^{-}+\bar{v}_{\mu}+2 \gamma+e^{-}$ 
C)    
D)

Of the following leptons, which has the greatest rest energy?

Which of the following decays violates conservation of lepton number?

If the quark content of the proton, p, is uud, the quark content of the antiproton, is: $\bar{p}$

A photon with an energy of E $\gamma$ = 2.0900 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV.What is the kinetic energy of the antiproton? (mpc2 = 938.3 MeV)

Which of the following particle reactions cannot occur?

In the standard model of the expansion of the universe, the total energy of a standard mass m is assumed to be zero.When we solve the resulting energy equation for the critical mass density of the universe, we find that the critical mass density is given by:

Which of the following reactions violates conservation of strangeness?

An electron and a positron (antielectron), both nearly at rest, collide.What particle(s) is(are) produced?

The particle reaction cannot occur because: $\pi^{+}+p \rightarrow \Sigma^{+}+\pi^{0}$

The three quarks in any baryon must all have different:

According to string theory, six space-time dimensions cannot be measured except as quantum numbers of internal particle properties because they are curled up in size of the order of:

Which one of the following is not true of neutrinos?

The rest-energy of the Z0 boson is 96 GeV.Using this information, find the maximum length of time a virtual Z0 can exist, in accordance with the uncertainty principle .(1 eV = 1.6 * 10-19 J.) $\Delta E \Delta t=h / 2$

The omega-minus particle decays with the X0 and the $\pi$ - eventually decaying into stable baryon(s) and lepton(s).Utilising conservation laws, which of the following is the correct accounting of the decay products? $\Omega^{-} \rightarrow X^{0}+\pi^{-}$

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Filters

Exam 22: Particle Physics

Of the following leptons, which has the greatest rest energy?

Which of the following decays violates conservation of lepton number?

If the quark content of the proton, p, is uud, the quark content of the antiproton, is: pˉ\bar{p}pˉ​

A photon with an energy of E γ\gammaγ = 2.0900 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV.What is the kinetic energy of the antiproton? (mpc2 = 938.3 MeV)

Which of the following particle reactions cannot occur?

In the standard model of the expansion of the universe, the total energy of a standard mass m is assumed to be zero.When we solve the resulting energy equation for the critical mass density of the universe, we find that the critical mass density is given by:

Which of the following reactions violates conservation of strangeness?

An electron and a positron (antielectron), both nearly at rest, collide.What particle(s) is(are) produced?

The particle reaction cannot occur because: π++p→Σ++π0\pi^{+}+p \rightarrow \Sigma^{+}+\pi^{0}π++p→Σ++π0

The three quarks in any baryon must all have different:

According to string theory, six space-time dimensions cannot be measured except as quantum numbers of internal particle properties because they are curled up in size of the order of:

Which one of the following is not true of neutrinos?

The rest-energy of the Z0 boson is 96 GeV.Using this information, find the maximum length of time a virtual Z0 can exist, in accordance with the uncertainty principle .(1 eV = 1.6 * 10-19 J.) ΔEΔt=h/2\Delta E \Delta t=h / 2ΔEΔt=h/2

The omega-minus particle decays with the X0 and the π\piπ - eventually decaying into stable baryon(s) and lepton(s).Utilising conservation laws, which of the following is the correct accounting of the decay products? Ω−→X0+π−\Omega^{-} \rightarrow X^{0}+\pi^{-}Ω−→X0+π−

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Filters

If the quark content of the proton, p, is uud, the quark content of the antiproton, is: $\bar{p}$

A photon with an energy of E $\gamma$ = 2.0900 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV.What is the kinetic energy of the antiproton? (mpc2 = 938.3 MeV)

The particle reaction cannot occur because: $\pi^{+}+p \rightarrow \Sigma^{+}+\pi^{0}$

The rest-energy of the Z0 boson is 96 GeV.Using this information, find the maximum length of time a virtual Z0 can exist, in accordance with the uncertainty principle .(1 eV = 1.6 * 10-19 J.) $\Delta E \Delta t=h / 2$

The omega-minus particle decays with the X0 and the $\pi$ - eventually decaying into stable baryon(s) and lepton(s).Utilising conservation laws, which of the following is the correct accounting of the decay products? $\Omega^{-} \rightarrow X^{0}+\pi^{-}$