Question 1

The acceleration (or deceleration)of the expansion of the universe is determined by

Accepted Answer

A) the standard matter,baryons and leptons. 
B) the dark matter in the universe. 
C) the dark energy in the universe. 
D) all of the above. 
E) only (b)and (c)above. 
A) the standard matter,baryons and leptons. 
B) the dark matter in the universe. 
C) the dark energy in the universe. 
D) all of the above. 
E) only (b)and (c)above.

Question 2

The law of conservation of baryon number is that

Accepted Answer

A) the total number of baryons and leptons is conserved. 
B) the total number of baryons is conserved. 
C) the (number of baryons)- (number of antibaryons)is conserved. 
D) the total number of quarks is conserved. 
E) the (number of baryons)+ (number of antibaryons)is conserved. 
A) the total number of baryons and leptons is conserved. 
B) the total number of baryons is conserved. 
C) the (number of baryons)- (number of antibaryons)is conserved. 
D) the total number of quarks is conserved. 
E) the (number of baryons)+ (number of antibaryons)is conserved.

Question 3

Which of the following particle reactions cannot occur?

Accepted Answer

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

Question 4

Which of the following decays violates conservation of lepton number?

Accepted Answer

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

Question 5

A $\Sigma$+ particle,composed of uus quarks,has the same ____ as a proton.

Accepted Answer

A) baryon number and charm. 
B) baryon number and electric charge. 
C) baryon number and strangeness. 
D) baryon number,electric charge,and charm. 
E) electric charge and strangeness. 
A) baryon number and charm. 
B) baryon number and electric charge. 
C) baryon number and strangeness. 
D) baryon number,electric charge,and charm. 
E) electric charge and strangeness.

Question 6

A photon with an energy of E $\gamma$  = 2.090 0 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...

Question 7

All particles can be classified into

Accepted Answer

A) Leptons and quarks 
B) Hadrons and leptons 
C) Baryons and leptons 
D) Mesons and Baryons 
A) Leptons and quarks 
B) Hadrons and leptons 
C) Baryons and leptons 
D) Mesons and Baryons

Question 8

If a K0 meson at rest decays in 0.89 *10 - 10 s,how far will a K0 meson moving at 0.96 c travel through a bubble chamber?

Accepted Answer

A) 17 cm 
B) 1.1 cm 
C) 53 cm 
D) 42 mm 
E) 9.2 cm 
A) 17 cm 
B) 1.1 cm 
C) 53 cm 
D) 42 mm 
E) 9.2 cm

Question 9

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

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

Which of the following reactions cannot occur?

Accepted Answer

A) n $\rightarrow$ p + e  -  + $\bar { v } _ { e }$ 
B) p + n $\rightarrow$p + p + $\overline{p}$ 
C) $\mu$-  $\rightarrow$0 e -  + $\bar { v } _ { e }$ + $v$ 
D)  $\pi$- $\rightarrow$$\mu$-  + $\nu$$\mu$ 
E)  $\pi$+ $\rightarrow$$\mu$+ + $\bar { \nu } _ { \mu }$ 
A) n $\rightarrow$ p + e  -  + $\bar { v } _ { e }$ 
B) p + n $\rightarrow$p + p + $\overline{p}$ 
C) $\mu$-  $\rightarrow$0 e -  + $\bar { v } _ { e }$ + $v$ 
D)  $\pi$- $\rightarrow$$\mu$-  + $\nu$$\mu$ 
E)  $\pi$+ $\rightarrow$$\mu$+ + $\bar { \nu } _ { \mu }$

Question 11

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.

Exam 31: Particle Physics

The acceleration (or deceleration)of the expansion of the universe is determined by

The law of conservation of baryon number is that

Which of the following particle reactions cannot occur?

Which of the following decays violates conservation of lepton number?

A Σ\SigmaΣ + particle,composed of uus quarks,has the same ____ as a proton.

A photon with an energy of E γ\gammaγ = 2.090 0 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)

All particles can be classified into

If a K0 meson at rest decays in 0.89 *10 - 10 s,how far will a K0 meson moving at 0.96 c travel through a bubble chamber?

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

Which of the following reactions cannot occur?

Which one of the following is not true of neutrinos?

Introduction and Vectors

Motion in One Dimension

Motion in Two Dimensions

The Laws of Motion

More Applications of Newtons Laws

Energy of a System

Conservation of Energy

Momentum and Collisions

Relativity

Rotational Motion

Gravity,planetary Orbits,and the Hydrogen Atom

Oscillatory Motion

Mechanical Waves

Superposition and Standing Waves

Fluid Mechanics

Temperature and the Kinetic Theory of Gases

Energy in Thermal Processes: the First Law of Thermodynamics

Heat Engines,entropy,and the Second Law of Thermodynamics

Electric Forces and Electric Fields

Electric Potential and Capacitance

Current and Direct Current Circuits

Magnetic Forces and Magnetic Fields

Faradays Law and Inductance

Electromagnetic Waves

Reflection and Refraction of Light

Image Formation by Mirrors and Lenses

Wave Optics

Quantum Physics

Atomic Physics

Nuclear Physics

Filters

A $\Sigma$ ⁺ particle,composed of uus quarks,has the same ____ as a proton.

A photon with an energy of E _$\gamma$ = 2.090 0 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? (m_pc² = 938.3 MeV)

If a K⁰ meson at rest decays in 0.89 *10 ^- ¹⁰ s,how far will a K⁰ meson moving at 0.96 c travel through a bubble chamber?

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