Question 1

Which of the following is not true of electron neutrinos?

Accepted Answer

A)  They are spinless. 
B)  They are chargeless. 
C)  They are massless (or nearly so). 
D)  They are leptons. 
A)  They are spinless. 
B)  They are chargeless. 
C)  They are massless (or nearly so). 
D)  They are leptons.

Question 2

The charge of some quarks or anti-quarks is:

Accepted Answer

A)  0. 
B)  1/2 (1.6 × 10−19)C. 
C)  1/3 (1.6 × 10−19)C. 
D)  1 (1.6 × 10−19)C. 
A)  0. 
B)  1/2 (1.6 × 10−19)C. 
C)  1/3 (1.6 × 10−19)C. 
D)  1 (1.6 × 10−19)C.

Question 3

A neutron and a proton have the same:

Accepted Answer

A)  charge. 
B)  half-life. 
C)  mass. 
D)  baryon number. 
A)  charge. 
B)  half-life. 
C)  mass. 
D)  baryon number.

Question 4

The weak force is mediated by:

Accepted Answer

A)  the W+ boson. 
B)  the W- boson. 
C)  the Z0 boson. 
D)  All of the above. 
A)  the W+ boson. 
B)  the W- boson. 
C)  the Z0 boson. 
D)  All of the above.

Question 5

In a nuclear fusion reactor,the Lawson criterion prescribes the necessary conditions,as related to density and confinement time of the plasma fuel,in order that the process produces a net power output.If the fuel density were doubled,by what factor would the required confinement time change?

Accepted Answer

A)  0.25 
B)  0.50 
C)  1.4 
D)  2.0 
A)  0.25 
B)  0.50 
C)  1.4 
D)  2.0

Question 6

How fast is an ion of deuterium moving,assuming rms speed,if it is in a plasma with a temperature of 160 × 106 K? (  
And  
)

Accepted Answer

A)  1.41E+6 m/s 
B)  1.41E+4 m/s 
C)  2.00E+12 m/s 
D)  8.16E+5 m/s 
E)  ​2.57E+6 m/s 
A)  1.41E+6 m/s 
B)  1.41E+4 m/s 
C)  2.00E+12 m/s 
D)  8.16E+5 m/s 
E)  ​2.57E+6 m/s

Question 7

Theoretical physicists have had the greatest success in combining which force with the electromagnetic force?

Accepted Answer

A)  strong nuclear force 
B)  weak nuclear force 
C)  gravitational force 
D)  the force caused by the exchange of gluons 
A)  strong nuclear force 
B)  weak nuclear force 
C)  gravitational force 
D)  the force caused by the exchange of gluons

Question 8

When uranium fissions into two medium-mass nuclei,the product nuclei tend to have an excess of neutrons when compared to stable nuclei.What type of radioactive decay would one expect from these product nuclei?

Accepted Answer

A)  meson decay 
B)  negative beta decay 
C)  positive beta decay 
D)  proton decay 
A)  meson decay 
B)  negative beta decay 
C)  positive beta decay 
D)  proton decay

Question 9

The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (mπ = 140 MeV/c2).Estimate the longest time a π can exist in accordance with the uncertainty principle ΔE⋅Δt = h/2π.(h/2π = 1.05 × 10−34 J⋅s,1 eV = 1.6 × 10−19 C)

Accepted Answer

A)  3.3 × 10−18 s 
B)  2.4 × 10−21 s 
C)  4.7 × 10−24 s 
D)  6.9 × 10−27 s 
A)  3.3 × 10−18 s 
B)  2.4 × 10−21 s 
C)  4.7 × 10−24 s 
D)  6.9 × 10−27 s

Question 10

The Dirac theory predicted that a positron would be:

Accepted Answer

A)  a negative electron in a negative energy state. 
B)  a particle with same mass as an electron but with opposite charge. 
C)  a particle with negative mass. 
D)  All of the above. 
A)  a negative electron in a negative energy state. 
B)  a particle with same mass as an electron but with opposite charge. 
C)  a particle with negative mass. 
D)  All of the above.

Question 11

Calculate the range of the force that might be produced by the virtual exchange of a proton.Assume ΔE⋅Δt = h/2π.(mp = 1.67 × 10−27 kg,c = 3.00 × 108 m/s,and h/2π = 1.05 × 10−34 J⋅s)

Accepted Answer

A)  6.7 × 10−25 m 
B)  2.1 × 10−16 m 
C)  6.0 × 10−8 m 
D)  1.5 × 10−15 m 
A)  6.7 × 10−25 m 
B)  2.1 × 10−16 m 
C)  6.0 × 10−8 m 
D)  1.5 × 10−15 m

Question 12

Which of the following is not conserved?

Accepted Answer

A)  lepton number 
B)  baryon number 
C)  meson number 
D)  energy 
A)  lepton number 
B)  baryon number 
C)  meson number 
D)  energy

Question 13

If a K0 meson at rest decays in 0.9 × 10−10 s,how far will a K0 meson moving at 0.92 c travel through a bubble chamber? (  
)

Accepted Answer

A)  6.3 cm 
B)  2.5 cm 
C)  0.97 cm 
D)  8.8 cm 
E)  ​0.70 cm 
A)  6.3 cm 
B)  2.5 cm 
C)  0.97 cm 
D)  8.8 cm 
E)  ​0.70 cm

Question 14

Calculate the energy released in the following fusion reaction where reactants are 6Li and a neutron;products are 4He and 3H.(atomic masses: 6Li,6.015 12;neutron,1.008 67;4He,4.002 60;3H,3.016 031;also 1 u = 931.5 MeV/c2)

Accepted Answer

A)  2.95 MeV 
B)  4.81 MeV 
C)  8.63 MeV 
D)  17.2 MeV 
A)  2.95 MeV 
B)  4.81 MeV 
C)  8.63 MeV 
D)  17.2 MeV

Question 15

What is the particle referred to as a WIMP?

Accepted Answer

A)  the result of a neutrino oscillation 
B)  a hypothetical particle left over from the Big Bang 
C)  a hypothetical particle in the MOND theory 
D)  none of the above 
A)  the result of a neutrino oscillation 
B)  a hypothetical particle left over from the Big Bang 
C)  a hypothetical particle in the MOND theory 
D)  none of the above

Question 16

Which of the following particles is made of two or more smaller particles?

Accepted Answer

A)  electron 
B)  photon 
C)  proton 
D)  None of the above. 
A)  electron 
B)  photon 
C)  proton 
D)  None of the above.

Question 17

A negative muon decays to form an electron and a mu neutrino and one additional particle.The other particle must be a(n):

Accepted Answer

A)  positron. 
B)  antineutrino. 
C)  neutrino. 
D)  photon. 
A)  positron. 
B)  antineutrino. 
C)  neutrino. 
D)  photon.

Question 18

The Big Bang occurred:

Accepted Answer

A)  about 15 to 20 billion years ago. 
B)  about 5 to 7 thousand years ago. 
C)  about 4 to 6 billion years ago. 
D)  infinitely far in the past. 
A)  about 15 to 20 billion years ago. 
B)  about 5 to 7 thousand years ago. 
C)  about 4 to 6 billion years ago. 
D)  infinitely far in the past.

Question 19

The Σ+,Σ0,and Σ- all have strangeness of (-1).The collision of a proton and a neutron to produce a Σ0 and an anti-Σ- cannot occur because it does not conserve:

Accepted Answer

A)  strangeness. 
B)  charge. 
C)  baryon number. 
D)  All of the above. 
A)  strangeness. 
B)  charge. 
C)  baryon number. 
D)  All of the above.

Question 20

According to present theories,there is a neutrino for all the following particles except:

Accepted Answer

A)  the neutral pion. 
B)  the electron. 
C)  the muon. 
D)  the tau lepton. 
A)  the neutral pion. 
B)  the electron. 
C)  the muon. 
D)  the tau lepton.

Exam 30: Nuclear Energy and Elementary Particles

Which of the following is not true of electron neutrinos?

The charge of some quarks or anti-quarks is:

A neutron and a proton have the same:

The weak force is mediated by:

In a nuclear fusion reactor,the Lawson criterion prescribes the necessary conditions,as related to density and confinement time of the plasma fuel,in order that the process produces a net power output.If the fuel density were doubled,by what factor would the required confinement time change?

How fast is an ion of deuterium moving,assuming rms speed,if it is in a plasma with a temperature of 160 × 106 K? ( And )

Theoretical physicists have had the greatest success in combining which force with the electromagnetic force?

When uranium fissions into two medium-mass nuclei,the product nuclei tend to have an excess of neutrons when compared to stable nuclei.What type of radioactive decay would one expect from these product nuclei?

The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (mπ = 140 MeV/c2).Estimate the longest time a π can exist in accordance with the uncertainty principle ΔE⋅Δt = h/2π.(h/2π = 1.05 × 10−34 J⋅s,1 eV = 1.6 × 10−19 C)

The Dirac theory predicted that a positron would be:

Calculate the range of the force that might be produced by the virtual exchange of a proton.Assume ΔE⋅Δt = h/2π.(mp = 1.67 × 10−27 kg,c = 3.00 × 108 m/s,and h/2π = 1.05 × 10−34 J⋅s)

Which of the following is not conserved?

If a K0 meson at rest decays in 0.9 × 10−10 s,how far will a K0 meson moving at 0.92 c travel through a bubble chamber? ( )

Calculate the energy released in the following fusion reaction where reactants are 6Li and a neutron;products are 4He and 3H.(atomic masses: 6Li,6.015 12;neutron,1.008 67;4He,4.002 60;3H,3.016 031;also 1 u = 931.5 MeV/c2)

What is the particle referred to as a WIMP?

Which of the following particles is made of two or more smaller particles?

A negative muon decays to form an electron and a mu neutrino and one additional particle.The other particle must be a(n):

The Big Bang occurred:

The Σ+,Σ0,and Σ- all have strangeness of (-1).The collision of a proton and a neutron to produce a Σ0 and an anti-Σ- cannot occur because it does not conserve:

According to present theories,there is a neutrino for all the following particles except:

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles: Part A

How fast is an ion of deuterium moving,assuming rms speed,if it is in a plasma with a temperature of 160 × 10⁶ K? ( And )

Calculate the range of the force that might be produced by the virtual exchange of a proton.Assume ΔE⋅Δt = h/2π.(m_p = 1.67 × 10−²⁷ kg,c = 3.00 × 10⁸ m/s,and h/2π = 1.05 × 10−³⁴ J⋅s)

If a K⁰ meson at rest decays in 0.9 × 10−¹⁰ s,how far will a K⁰ meson moving at 0.92 c travel through a bubble chamber? ( )

Calculate the energy released in the following fusion reaction where reactants are ⁶Li and a neutron;products are ⁴He and ³H.(atomic masses: ⁶Li,6.015 12;neutron,1.008 67;⁴He,4.002 60;³H,3.016 031;also 1 u = 931.5 MeV/c²)

The Σ⁺,Σ⁰,and Σ^- all have strangeness of (-1).The collision of a proton and a neutron to produce a Σ⁰ and an anti-Σ^- cannot occur because it does not conserve: