Question 1

The principle of relativity is

Accepted Answer

A)  momentum is conserved in all reference frames. 
B)  the Earth is a noninertial reference frame. 
C)  the speed of light is constant. 
D)  the laws of physics are the same in all inertial reference frames. 
E)  Newton's second law does not hold at high speeds. 
A)  momentum is conserved in all reference frames. 
B)  the Earth is a noninertial reference frame. 
C)  the speed of light is constant. 
D)  the laws of physics are the same in all inertial reference frames. 
E)  Newton's second law does not hold at high speeds.

Question 2

If a spaceship of proper length 40 m is measured to have a length 30 m,how fast is it moving?

Accepted Answer

A)  0.50 c 
B)  0.81 c 
C)  0.75 c 
D)  0.66 c 
E)  0.43 c 
A)  0.50 c 
B)  0.81 c 
C)  0.75 c 
D)  0.66 c 
E)  0.43 c

Question 3

A pair of observers moving relative to one another will:

Accepted Answer

A)  always agree on the ordering in time of two events 
B)  always disagree about whether two events are simultaneous 
C)  always disagree about the ordering in time of two events 
D)  sometimes disagree about whether two events are simultaneous 
A)  always agree on the ordering in time of two events 
B)  always disagree about whether two events are simultaneous 
C)  always disagree about the ordering in time of two events 
D)  sometimes disagree about whether two events are simultaneous

Question 4

A passenger is on a spaceship traveling at 0.8 c.The passenger observes that her watch

Accepted Answer

A)  is running slow. 
B)  is running fast. 
C)  is keeping time as usual. 
D)  is running slow if the ship is traveling in the positive direction. 
E)  is running slow if the ship is traveling in the negative direction. 
A)  is running slow. 
B)  is running fast. 
C)  is keeping time as usual. 
D)  is running slow if the ship is traveling in the positive direction. 
E)  is running slow if the ship is traveling in the negative direction.

Question 5

In a radioactive decay, 2.37 $\times$ 10-3 u are converted into kinetic energy.How much kinetic energy is this? (1 u = 1.66 $\times$ 10-27 kg)

Accepted Answer

A)  2.13 $\times$ 1014 J 
B)  9.31 $\times$ 108 J 
C)  3.54 $\times$ 10-13 J 
D)  3.93 $\times$ 10-30 J 
E)  1.60 $\times$ 10-13 J 
A)  2.13 $\times$ 1014 J 
B)  9.31 $\times$ 108 J 
C)  3.54 $\times$ 10-13 J 
D)  3.93 $\times$ 10-30 J 
E)  1.60 $\times$ 10-13 J

Question 6

If a proton has a kinetic energy of 1.000 GeV,what is its speed? (mp = 938 MeV/c2)

Accepted Answer

A)  0.935 c 
B)  0.875 c 
C)  0.766 c 
D)  0.586 c 
E)  0.343 c 
A)  0.935 c 
B)  0.875 c 
C)  0.766 c 
D)  0.586 c 
E)  0.343 c

Question 7

Tritium (3H) decays to 3He releasing 18.6 keV of energy.How much mass is converted into energy during this process?

Accepted Answer

A)  2.07 $\times$ 10-13 kg 
B)  2.07 $\times$ 10-10 kg 
C)  2.07 $\times$ 10-16 kg 
D)  3.31 $\times$ 10-29 kg 
E)  3.31 $\times$ 10-32 kg 
A)  2.07 $\times$ 10-13 kg 
B)  2.07 $\times$ 10-10 kg 
C)  2.07 $\times$ 10-16 kg 
D)  3.31 $\times$ 10-29 kg 
E)  3.31 $\times$ 10-32 kg

Question 8

Time of flight (TOF) is routinely used to distinguish between different particle species.Calculate the difference in time interval required for a proton (rest mass 938 MeV/c2) and a muon (rest mass: 106 MeV/c2) to travel 2.5m,if each have a momentum of 255 MeV/c.

Accepted Answer

A)  8 ns 
B)  15 ns 
C)  18 ns 
D)  10 ns 
A)  8 ns 
B)  15 ns 
C)  18 ns 
D)  10 ns

Question 9

How much energy is released by a nuclear reactor if the total mass of the fuel decreases by 1.0 g?

Accepted Answer

A)  9.0 $\times$ 1013 J 
B)  3.0 $\times$ 1011 J 
C)  9.0 $\times$ 1014 J 
D)  3.0 $\times$ 1014 J 
A)  9.0 $\times$ 1013 J 
B)  3.0 $\times$ 1011 J 
C)  9.0 $\times$ 1014 J 
D)  3.0 $\times$ 1014 J

Question 10

At what speed is the relativistic momentum five times the value calculated classically?

Accepted Answer

A)  0.99 c 
B)  0.98 c 
C)  0.96 c 
D)  0.80 c 
E)  0.20 c 
A)  0.99 c 
B)  0.98 c 
C)  0.96 c 
D)  0.80 c 
E)  0.20 c

Question 11

How tall is Mount Everest,according to a cosmic ray muon,a subatomic particle traveling straight down toward the Earth at 0.99c? On Earth,the height of Mt.Everest is viewed to be 8846 m.

Accepted Answer

A)  885 m 
B)  6.29 km 
C)  1.25 km 
D)  176 m 
A)  885 m 
B)  6.29 km 
C)  1.25 km 
D)  176 m

Question 12

A megaton explosion releases 4.5 $\times$ 1015 J.How much mass is converted into energy in this process?

Accepted Answer

A)  none,if it a result of a chemical reaction 
B)  none,since mass is conserved 
C)  50 kg 
D)  50 g 
E)  109 kg 
A)  none,if it a result of a chemical reaction 
B)  none,since mass is conserved 
C)  50 kg 
D)  50 g 
E)  109 kg

Question 13

Two observers will always agree on

Accepted Answer

A)  the speed of light. 
B)  the mass of cosmic ray muons. 
C)  the charge of cosmic ray muons. 
D)  the lifetime of cosmic ray muons. 
A)  the speed of light. 
B)  the mass of cosmic ray muons. 
C)  the charge of cosmic ray muons. 
D)  the lifetime of cosmic ray muons.

Question 14

In relativistic mechanics,what principle does not apply?

Accepted Answer

A)  The law of non-contradiction 
B)  The law of conservation of momentum 
C)  The law of conservation of energy 
D)  Gauss's Law 
E)  All of the these choices still apply under relativistic conditions. 
A)  The law of non-contradiction 
B)  The law of conservation of momentum 
C)  The law of conservation of energy 
D)  Gauss's Law 
E)  All of the these choices still apply under relativistic conditions.

Question 15

Radioactive particles moving at 0.80 c are measured to have a half-life of 4.3 $\times$ 10-8 s.What is their half-life when at rest?

Accepted Answer

A)  7.2 $\times$ 10-8 s 
B)  2.6 $\times$ 10-8 s 
C)  3.4 $\times$ 10-8 s 
D)  1.6 $\times$ 10-8 s 
E)  1.7 $\times$ 10-7 s 
A)  7.2 $\times$ 10-8 s 
B)  2.6 $\times$ 10-8 s 
C)  3.4 $\times$ 10-8 s 
D)  1.6 $\times$ 10-8 s 
E)  1.7 $\times$ 10-7 s

Question 16

What is the Lorentz factor,$\gamma$,for a speed of 0.800 c?

Accepted Answer

A)  0.800 
B)  1.67 
C)  0.600 
D)  0.360 
E)  1.25 
A)  0.800 
B)  1.67 
C)  0.600 
D)  0.360 
E)  1.25

Question 17

The expression used for momentum,p = mv,

Accepted Answer

A)  Is a good low-velocity approximation 
B)  Is a good high-velocity approximation 
C)  Is correct as long as we properly understand v 
D)  Always gives too high a value for p 
A)  Is a good low-velocity approximation 
B)  Is a good high-velocity approximation 
C)  Is correct as long as we properly understand v 
D)  Always gives too high a value for p

Question 18

Which best describes the proper time interval between two events?

Accepted Answer

A)  the longest interval measured by any inertial observer 
B)  the interval measured in the reference frame in which the two events occur a maximum distance from each other 
C)  the interval measured in a reference frame in which the two events are simultaneous 
D)  the interval measured in a reference frame in which the two events occur at the same place 
E)  None of these choices are correct 
A)  the longest interval measured by any inertial observer 
B)  the interval measured in the reference frame in which the two events occur a maximum distance from each other 
C)  the interval measured in a reference frame in which the two events are simultaneous 
D)  the interval measured in a reference frame in which the two events occur at the same place 
E)  None of these choices are correct

Question 19

Which of the following is (are)invariant(s)?

Accepted Answer

A)  mass 
B)  momentum 
C)  energy 
D)  the speed of light 
E)  mass and the speed of light 
A)  mass 
B)  momentum 
C)  energy 
D)  the speed of light 
E)  mass and the speed of light

Question 20

If a proton has a kinetic energy of 1.000 GeV,what is its momentum? (mp = 938.0 MeV/c2)

Accepted Answer

A)  1.938 GeV/c 
B)  1.000 GeV/c 
C)  938.0 GeV/c 
D)  2.872 GeV/c 
E)  1.696 GeV/c 
A)  1.938 GeV/c 
B)  1.000 GeV/c 
C)  938.0 GeV/c 
D)  2.872 GeV/c 
E)  1.696 GeV/c

Exam 26: Relativity

The principle of relativity is

If a spaceship of proper length 40 m is measured to have a length 30 m,how fast is it moving?

A pair of observers moving relative to one another will:

A passenger is on a spaceship traveling at 0.8 c.The passenger observes that her watch

In a radioactive decay, 2.37 ×\times× 10-3 u are converted into kinetic energy.How much kinetic energy is this? (1 u = 1.66 ×\times× 10-27 kg)

If a proton has a kinetic energy of 1.000 GeV,what is its speed? (mp = 938 MeV/c2)

Tritium (3H) decays to 3He releasing 18.6 keV of energy.How much mass is converted into energy during this process?

Time of flight (TOF) is routinely used to distinguish between different particle species.Calculate the difference in time interval required for a proton (rest mass 938 MeV/c2) and a muon (rest mass: 106 MeV/c2) to travel 2.5m,if each have a momentum of 255 MeV/c.

How much energy is released by a nuclear reactor if the total mass of the fuel decreases by 1.0 g?

At what speed is the relativistic momentum five times the value calculated classically?

How tall is Mount Everest,according to a cosmic ray muon,a subatomic particle traveling straight down toward the Earth at 0.99c? On Earth,the height of Mt.Everest is viewed to be 8846 m.

A megaton explosion releases 4.5 ×\times× 1015 J.How much mass is converted into energy in this process?

Two observers will always agree on

In relativistic mechanics,what principle does not apply?

Radioactive particles moving at 0.80 c are measured to have a half-life of 4.3 ×\times× 10-8 s.What is their half-life when at rest?

What is the Lorentz factor, γ\gammaγ ,for a speed of 0.800 c?

The expression used for momentum,p = mv,

Which best describes the proper time interval between two events?

Which of the following is (are)invariant(s)?

If a proton has a kinetic energy of 1.000 GeV,what is its momentum? (mp = 938.0 MeV/c2)

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

In a radioactive decay, 2.37 $\times$ 10^-3 u are converted into kinetic energy.How much kinetic energy is this? (1 u = 1.66 $\times$ 10^-27 kg)

If a proton has a kinetic energy of 1.000 GeV,what is its speed? (m_p = 938 MeV/c²)

Tritium (³H) decays to ³He releasing 18.6 keV of energy.How much mass is converted into energy during this process?

Time of flight (TOF) is routinely used to distinguish between different particle species.Calculate the difference in time interval required for a proton (rest mass 938 MeV/c²) and a muon (rest mass: 106 MeV/c²) to travel 2.5m,if each have a momentum of 255 MeV/c.

A megaton explosion releases 4.5 $\times$ 10¹⁵ J.How much mass is converted into energy in this process?

Radioactive particles moving at 0.80 c are measured to have a half-life of 4.3 $\times$ 10^-8 s.What is their half-life when at rest?

What is the Lorentz factor, $\gamma$ ,for a speed of 0.800 c?

If a proton has a kinetic energy of 1.000 GeV,what is its momentum? (m_p = 938.0 MeV/c²)