Question 1

A proton and an antiproton each with total energy of 400 GeV collide head-on.What is the total energy (particles + energy)released?

Accepted Answer

A) zero 
B) 400 Gev 
C) 800 GeV 
D) 1 600 GeV 
E) 2 400 GeV 
A) zero 
B) 400 Gev 
C) 800 GeV 
D) 1 600 GeV 
E) 2 400 GeV

Question 2

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 3

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 4

Which of the following particle reactions cannot occur?

Accepted Answer

A) p + p → p + p + p +   
B) p +   → 2γ 
C) π+ + p → K+ + Σ+ 
D) γ + p → n + π0 
E) e− + e+ → 2γ 
A) p + p → p + p + p +   
B) p +   → 2γ 
C) π+ + p → K+ + Σ+ 
D) γ + p → n + π0 
E) e− + e+ → 2γ

Question 5

In this course we have seen that baryons have inertial and gravitational mass,intrinsic angular momentum,and other internal properties that have been given names like baryon number,strangeness,charm,etc.The Standard Model's explanation for these properties of baryons is that

Accepted Answer

A) the baryons are states of something more elementary that can exist in multiple quantum states. 
B) the leptons are states of something more elementary that can exist in multiple quantum states. 
C) photons are states of something more elementary that can exist in multiple quantum states. 
D) according to the Heisenberg Uncertainty Principle quantum numbers are indeterminate. 
E) quarks are states of something more elementary that can exist in multiple quantum states. 
A) the baryons are states of something more elementary that can exist in multiple quantum states. 
B) the leptons are states of something more elementary that can exist in multiple quantum states. 
C) photons are states of something more elementary that can exist in multiple quantum states. 
D) according to the Heisenberg Uncertainty Principle quantum numbers are indeterminate. 
E) quarks are states of something more elementary that can exist in multiple quantum states.

Question 6

The decay  
Is not possible because

Accepted Answer

A) Le is not conserved. 
B) Lμ is not conserved. 
C) quark number is not conserved. 
D) all of the above are not conserved. 
E) only Le and Lμ are not conserved. 
A) Le is not conserved. 
B) Lμ is not conserved. 
C) quark number is not conserved. 
D) all of the above are not conserved. 
E) only Le and Lμ are not conserved.

Question 7

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 8

Which of the following reactions violates conservation of strangeness?

Accepted Answer

A) Ω− → 3γ 
B)    
C)    
D)    
E)    
A) Ω− → 3γ 
B)    
C)    
D)    
E)

Question 9

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

Accepted Answer

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

Question 10

Particles composed of quarks are

Accepted Answer

A) photons. 
B) leptons. 
C) neutrinos. 
D) W and Z bosons. 
E) baryons and mesons. 
A) photons. 
B) leptons. 
C) neutrinos. 
D) W and Z bosons. 
E) baryons and mesons.

Question 11

The particle Δ++ has an electric charge twice that of the proton and baryon number +1.Strangeness,charm,bottomness and topness are all 0.Its quark composition must be

Accepted Answer

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

Question 12

A Σ+ 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 13

A photon with an energy of Eγ = 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

Question 14

Calculate the range of the force that might be produced by the virtual exchange of a proton.(mp = 1.67 × 10−27 kg,h = 6.626 × 10−34 J ⋅ s)

Accepted Answer

Exam 46: Particle Physics and Cosmology

A proton and an antiproton each with total energy of 400 GeV collide head-on.What is the total energy (particles + energy)released?

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?

In this course we have seen that baryons have inertial and gravitational mass,intrinsic angular momentum,and other internal properties that have been given names like baryon number,strangeness,charm,etc.The Standard Model's explanation for these properties of baryons is that

The decay Is not possible because

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?

Which of the following reactions violates conservation of strangeness?

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

Particles composed of quarks are

The particle Δ++ has an electric charge twice that of the proton and baryon number +1.Strangeness,charm,bottomness and topness are all 0.Its quark composition must be

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

A photon with an energy of Eγ = 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)

Calculate the range of the force that might be produced by the virtual exchange of a proton.(mp = 1.67 × 10−27 kg,h = 6.626 × 10−34 J ⋅ s)

Physics and Measurement

Motion in One Dimension

Vectors

Motion in Two Dimensions

The Laws of Motion

Circular Motion and Other Applications of Newtons Laws

Energy of a System

Conservation of Energy

Linear Momentum and Collisions

Rotation of a Rigid Object About a Fixed Axis

Angular Momentum

Static Equilibrium and Elasticity

Universal Gravitation

Fluid Mechanics

Oscillatory Motion

Wave Motion

Sound Waves

Superposition and Standing Waves

Temperature

The First Law of Thermodynamics

The Kinetic Theory of Gases

Heat Engines, entropy, and the Second Law of Thermodynamics

Electric Fields

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Sources of the Magnetic Field

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 Polarization

Relativity

Introduction to Quantum Physics

Quantum Mechanics

Atomic Physics

Molecules and Solids

Nuclear Structure

Applications of Nuclear Physics

Filters

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 Δ⁺⁺ has an electric charge twice that of the proton and baryon number +1.Strangeness,charm,bottomness and topness are all 0.Its quark composition must be

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

A photon with an energy of Eγ = 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)

Calculate the range of the force that might be produced by the virtual exchange of a proton.(m_p = 1.67 × 10−²⁷ kg,h = 6.626 × 10−³⁴ J ⋅ s)