Question 1

The quark structure of the neutron is udd.What is the quark structure of the antineutron?

Accepted Answer

A) 
  
B)  ddu 
C) 
  
D)  udd,since the neutron is its own antiparticle 
A) 
  
B)  ddu 
C) 
  
D)  udd,since the neutron is its own antiparticle A

Question 2

The following reaction can occur by the strong interaction: π0 + n → K+ + Σ-.If the quark composition of the n is (udd),the π 0 is   And the composition of the K+ is   ,what is the quark composition of the Σ-?

Accepted Answer

A)  uds 
B)  dds 
C)  sss 
D) 
  
A)  uds 
B)  dds 
C)  sss 
D) 
  B

Question 3

The exchange of mediating photons can produce

Accepted Answer

A)  neither a repulsive nor an attractive force. 
B)  either a repulsive or an attractive force. 
C)  a repulsive force. 
D)  an attractive force. 
A)  neither a repulsive nor an attractive force. 
B)  either a repulsive or an attractive force. 
C)  a repulsive force. 
D)  an attractive force. B

Question 4

The microwave background radiation:

Accepted Answer

A)  represents the leftover glow from the Big Bang. 
B)  had its slight non-uniformity measured by COBE. 
C)  was discovered by Penzias and Wilson. 
D)  All of the above. 
A)  represents the leftover glow from the Big Bang. 
B)  had its slight non-uniformity measured by COBE. 
C)  was discovered by Penzias and Wilson. 
D)  All of the above.

Question 5

Which of the following forces is the strongest at near distances?

Accepted Answer

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

Question 6

A proton and antiproton each with total energy 800 GeV collide head-on.What is the total energy (particles + energy)released?

Accepted Answer

A)  zero 
B)  800 GeV 
C)  400 GeV 
D)  1600 GeV 
A)  zero 
B)  800 GeV 
C)  400 GeV 
D)  1600 GeV

Question 7

Of the following mesons,which is its own antiparticle?

Accepted Answer

A)  K- 
B)  φ 
C)  π+ 
D)  none of those given 
A)  K- 
B)  φ 
C)  π+ 
D)  none of those given

Question 8

If a K0 meson at rest decays in 0.90 × 10−10 s,how far will a K0 meson moving at 0.95c travel through a bubble chamber? (c = 3.00 × 108 m/s)

Accepted Answer

A)  2.6 cm 
B)  8.2 cm 
C)  9.3 cm 
D)  13 cm 
A)  2.6 cm 
B)  8.2 cm 
C)  9.3 cm 
D)  13 cm

Question 9

The strong force is mediated by

Accepted Answer

A)  the gluon. 
B)  the W- boson. 
C)  the W+ boson. 
D)  All of these choices. 
A)  the gluon. 
B)  the W- boson. 
C)  the W+ boson. 
D)  All of these choices.

Question 10

Which of these particles has the least mass?

Accepted Answer

A)  electron neutrino 
B)  muon 
C)  electron 
D)  pion 
A)  electron neutrino 
B)  muon 
C)  electron 
D)  pion

Question 11

The cosmic background radiation appears compatible with a blackbody source at what temperature?

Accepted Answer

A)  0.0003 K 
B)  3 K 
C)  300 K 
D)  0.03 K 
A)  0.0003 K 
B)  3 K 
C)  300 K 
D)  0.03 K

Question 12

Of the quarks u,d,c,s,t,and b,which have positive fractional electronic charge?

Accepted Answer

A)  u,d,c 
B)  d,s,b 
C)  s,t,b 
D)  u,c,t 
A)  u,d,c 
B)  d,s,b 
C)  s,t,b 
D)  u,c,t

Question 13

Processes in which one type of quark is converted into another type of quark involve which force?

Accepted Answer

A)  electromagnetic 
B)  strong force 
C)  weak force 
D)  gravitational 
A)  electromagnetic 
B)  strong force 
C)  weak force 
D)  gravitational

Question 14

What following quantity is conserved in the following reaction:  
?

Accepted Answer

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

Question 15

The constituent quarks of the proton are uud.What are the charges on u and d?

Accepted Answer

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

Question 16

Assuming the Hubble constant is (21 km/s)/(106 ly),what is the recession speed of a galaxy 300 million parsecs away? (1 parsec = 3.26 ly)

Accepted Answer

A)  4200 km/s 
B)  21,000 km/s 
C)  640 km/s 
D)  7000 km/s 
A)  4200 km/s 
B)  21,000 km/s 
C)  640 km/s 
D)  7000 km/s

Exam 31: Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

The quark structure of the neutron is udd.What is the quark structure of the antineutron?

The following reaction can occur by the strong interaction: π0 + n → K+ + Σ-.If the quark composition of the n is (udd),the π 0 is And the composition of the K+ is ,what is the quark composition of the Σ-?

The exchange of mediating photons can produce

The microwave background radiation:

Which of the following forces is the strongest at near distances?

A proton and antiproton each with total energy 800 GeV collide head-on.What is the total energy (particles + energy)released?

Of the following mesons,which is its own antiparticle?

If a K0 meson at rest decays in 0.90 × 10−10 s,how far will a K0 meson moving at 0.95c travel through a bubble chamber? (c = 3.00 × 108 m/s)

The strong force is mediated by

Which of these particles has the least mass?

The cosmic background radiation appears compatible with a blackbody source at what temperature?

Of the quarks u,d,c,s,t,and b,which have positive fractional electronic charge?

Processes in which one type of quark is converted into another type of quark involve which force?

What following quantity is conserved in the following reaction: ?

The constituent quarks of the proton are uud.What are the charges on u and d?

Assuming the Hubble constant is (21 km/s)/(106 ly),what is the recession speed of a galaxy 300 million parsecs away? (1 parsec = 3.26 ly)

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

Nuclear Energy and Elementary Particles: Part A

Filters

The following reaction can occur by the strong interaction: π⁰ + n → K⁺ + Σ^-.If the quark composition of the n is (udd),the π ⁰ is And the composition of the K⁺ is ,what is the quark composition of the Σ^-?

If a K⁰ meson at rest decays in 0.90 × 10−¹⁰ s,how far will a K⁰ meson moving at 0.95c travel through a bubble chamber? (c = 3.00 × 10⁸ m/s)

Assuming the Hubble constant is (21 km/s)/(10⁶ ly),what is the recession speed of a galaxy 300 million parsecs away? (1 parsec = 3.26 ly)