Question 1

Two events occur on the x axis separated in time by  Δ\DeltaΔ t and in space by  Δ\DeltaΔ x.A reference frame, traveling at less than the speed of light, in which the two events occur at the same coordinate:

Accepted Answer

A)  exists no matter what the values of  Δ\DeltaΔ x and F Δ\DeltaΔ t
B)  exists only if  Δ\DeltaΔ x/ Δ\DeltaΔ  
C)  exists only if  Δ\DeltaΔ x/ Δ\DeltaΔ t > c
D)  exists only if  Δ\DeltaΔ x/ Δ\DeltaΔ t = c
E)  does not exist under any condition F) D) and E)
G) A) and B)

Question 2

Two events occur 100 m apart with an intervening time interval of 0.37  μ\muμ s.The speed of a clock that measures the proper time between the events is:

Accepted Answer

A)  0 c
B)  0.45c
C)  0.56c
D)  0.90c
E)  1.8c F) C) and E)
G) D) and E)

Question 3

The mass of a particle is m.In order for its total energy to be twice its rest energy, its momentum must be:

Accepted Answer

A)  mc/2
B)  mc/ 
C)  mc
D)  
E)  2mcF) A) and B)
G) A) and C)

Question 4

Two isotopes of hydrogen fuse to form a helium nucleus and a neutron: 2H + 3H → 4He + n
The masses are:
2H + 3H → 4He + n The masses are:   What is the Q value of this reaction? A) 1.9 MeV B) 2.5 MeV C) 2.8 MeV D) 17.6 MeV E) 938 MeV" class="answers-bank-image d-inline" rel="preload" > What is the Q value of this reaction?

Accepted Answer

A)  1.9 MeV
B)  2.5 MeV
C)  2.8 MeV
D)  17.6 MeV
E)  938 MeVF) A) and E)
G) C) and D)

Question 5

A consequence of Einstein's theory of relativity is:

Accepted Answer

A)  moving clocks appear to run more slowly than when they are at rest
B)  moving rods appear longer than when they are at rest
C)  light has both wave and particle properties
D)  the laws of physics must appear the same to all observers moving with uniform velocity relative to each other
E)  everything is relativeF) B) and C)
G) B) and E)

Question 6

An electron (m = 9.11 * 10-31 kg) has a speed of 0.95c.Its kinetic energy is:

Accepted Answer

A)  8.2 * 10-14 J
B)  1.8 * 10-13 J
C)  2.0 * 10-13 J
D)  2.2 *10-13 J
E)  2.6 * 10-13 JF) A) and E)
G) A) and D)

Question 7

The work that must be done to increase the speed of an electron (m = 9.11 * 10-31 kg) from 0.90c to 0.95c is:

Accepted Answer

A)  8.2 *10-13 J
B)  3.2 *10-13 J
C)  2.6 * 10-13 J
D)  7.4 * 10-14 J
E)  3.8 * 10-15 JF) A) and C)
G) B) and D)

Question 8

Two events occur on the x axis separated in time by  Δ\DeltaΔ t and in space by  Δ\DeltaΔ x.A reference frame, traveling at less than the speed of light, in which the two events occur at the same time:

Accepted Answer

A)  exists no matter what the values of  Δ\DeltaΔ x and  Δ\DeltaΔ t
B)  exists only if  Δ\DeltaΔ x/ Δ\DeltaΔ t 
C)  exists only if  Δ\DeltaΔ x/ Δ\DeltaΔ t > c
D)  exists only if  Δ\DeltaΔ x/ Δ\DeltaΔ t = c
E)  does not exist under any condition F) A) and B)
G) C) and D)

Question 9

The length of a meter stick moving at 0.95c in the direction of its length with respect to the laboratory is measured by simultaneously marking its ends on an axis which is stationary in the laboratory.As measured by clocks moving with the stick, the time interval between the making of the back mark and the making of the front mark is:

Accepted Answer

A)  0 s
B)  1.1 *10-9 s
C)  3.2 * 10-9 s
D)  3.5 * 10-9 s
E)  1.1 *10-8 sF) B) and D)
G) A) and B)

Question 10

Frame S' moves in the positive x direction at 0.6c with respect to frame S.A particle moves in the positive x direction at 0.4c as measured by an observer in S'.The speed of the particle as measured by an observer in S is:

Accepted Answer

A)  c/5
B)  5c/19
C)  8c/25
D)  25c/31
E)  cF) B) and D)
G) A) and C)

Question 11

If the mass of a particle is zero its speed must be:

Accepted Answer

A)  c
B)  infinite
C)  0
D)  any speed less than c
E)  any speed greater than cF) None of the above
G) All of the above

Question 12

An electron (m = 9.11 *10-31 kg) has a speed of 0.95c.The magnitude of its momentum is:

Accepted Answer

A)  2.6 *10-22 kg . m/s
B)  2.9 * 10-22 kg . m/s
C)  6.0 * 10-22 kg .m/s
D)  8.3 *10-22 kg . m/s
E)  8.8 * 10-22 kg . m/sF) None of the above
G) B) and C)

Question 13

Pi mesons at rest have a half-life of T.If a beam of pi mesons is traveling at a speed of v =  β\betaβ c, the distance in which the intensity of the beam is halved is:

Accepted Answer

A)  "c β\betaβ T(1 -  β\betaβ 2) -1/2"
B)  "c β\betaβ T[(1 +  β\betaβ ) /(1 -  β\betaβ ) ]1/2"
C)  " β\betaβ vT"
D)  "(1 -  β\betaβ 2) 1/2vT"
E)  "none of the above" F) C) and D)
G) B) and E)

Question 14

A rocket traveling with constant velocity makes an 8.4 * 1015 m trip in 1 year.The proper time between events which mark the beginning and end of the trip is:

Accepted Answer

A)  0.21 years
B)  0.46 years
C)  1.0 years
D)  2.2 years
E)  4.7 yearsF) C) and E)
G) None of the above

Question 15

As we watch, a spaceship passes us in time  Δ\DeltaΔ t.The crew of the spaceship measures the passage time and finds it to be  Δ\DeltaΔ t'.Which of the following statements is true?

Accepted Answer

A)  " Δ\DeltaΔ t is the proper time for the passage and it is smaller than  Δ\DeltaΔ t'"
B)  " Δ\DeltaΔ t is the proper time for the passage and it is greater than  Δ\DeltaΔ t'"
C)  " Δ\DeltaΔ t' is the proper time for the passage and it is smaller than  Δ\DeltaΔ t"
D)  " Δ\DeltaΔ t' is the proper time for the passage and it is greater than  Δ\DeltaΔ t"
E)  "None of the above statements are true." F) B) and E)
G) A) and B)

Question 16

An electron is moving at 0.6c.If we calculate its kinetic energy using (1/2) mv2, we get a result which is:

Accepted Answer

A)  just right
B)  just half enough
C)  twice the correct value
D)  about 1% too low
E)  about 28% too lowF) B) and E)
G) A) and D)

Question 17

A console lamp in the cabin of a spaceship appears green when the ship and observer are both at rest.When the ship is moving at 0.90c away from Earth, passengers on board see:

Accepted Answer

A)  a dark lamp (the frequency is too high to be seen) 
B)  a dark lamp (the frequency is too low to be seen) 
C)  a red lamp
D)  a violet lamp
E)  a green lampF) A) and E)
G) A) and C)

Question 18

If the kinetic energy of a particle is equal to its rest energy then its speed must be:

Accepted Answer

A)  0.25c
B)  0.50c
C)  0.87c
D)  c
E)  unknown unless its mass is givenF) C) and E)
G) A) and D)

Question 19

According to the theory of relativity:

Accepted Answer

A)  mass is a form of energy
B)  moving particles lose mass
C)  momentum is not conserved in high speed collisions
D)  a rod moving rapidly sideways (perpendicular to its length) is shorter along its length
E)  a rod moving rapidly sideways (perpendicular to its length) is longer along its lengthF) A) and B)
G) B) and E)

Question 20

Two events occur 100 m apart with an intervening time interval of 0.60  μ\muμ s.The speed of a reference frame in which they occur at the same coordinate is:

Accepted Answer

A)  0 c
B)  0.25c
C)  0.56c
D)  1.1c
E)  1.8c F) B) and E)
G) B) and C)

Exam 37: Relativity

As we watch, a spaceship passes us in time $\Delta$ t.The crew of the spaceship measures the passage time and finds it to be $\Delta$ t'.Which of the following statements is true?

Correct Answer
verified

According to the theory of relativity:

Correct Answer
verified

If the kinetic energy of a particle is equal to its rest energy then its speed must be:

Correct Answer
verified

Two events occur on the x axis separated in time by $\Delta$ t and in space by $\Delta$ x.A reference frame, traveling at less than the speed of light, in which the two events occur at the same coordinate:

Correct Answer
verified

If the mass of a particle is zero its speed must be:

Correct Answer
verified

Two isotopes of hydrogen fuse to form a helium nucleus and a neutron: ²H + ³H → ⁴He + n The masses are: What is the Q value of this reaction?

Correct Answer
verified

Pi mesons at rest have a half-life of T.If a beam of pi mesons is traveling at a speed of v = $\beta$ c, the distance in which the intensity of the beam is halved is:

Correct Answer
verified

Correct Answer
verified

An electron (m = 9.11 *10^-31 kg) has a speed of 0.95c.The magnitude of its momentum is:

Correct Answer
verified

A consequence of Einstein's theory of relativity is:

Correct Answer
verified

The work that must be done to increase the speed of an electron (m = 9.11 * 10^-31 kg) from 0.90c to 0.95c is:

Correct Answer
verified

Two events occur on the x axis separated in time by $\Delta$ t and in space by $\Delta$ x.A reference frame, traveling at less than the speed of light, in which the two events occur at the same time:

Correct Answer
verified

The mass of a particle is m.In order for its total energy to be twice its rest energy, its momentum must be:

Correct Answer
verified

An electron (m = 9.11 * 10^-31 kg) has a speed of 0.95c.Its kinetic energy is:

Correct Answer
verified

A rocket traveling with constant velocity makes an 8.4 * 10¹⁵ m trip in 1 year.The proper time between events which mark the beginning and end of the trip is:

Correct Answer
verified

A console lamp in the cabin of a spaceship appears green when the ship and observer are both at rest.When the ship is moving at 0.90c away from Earth, passengers on board see:

Correct Answer
verified

Frame S' moves in the positive x direction at 0.6c with respect to frame S.A particle moves in the positive x direction at 0.4c as measured by an observer in S'.The speed of the particle as measured by an observer in S is:

Correct Answer
verified

Two events occur 100 m apart with an intervening time interval of 0.60 $\mu$ s.The speed of a reference frame in which they occur at the same coordinate is:

Correct Answer
verified

Two events occur 100 m apart with an intervening time interval of 0.37 $\mu$ s.The speed of a clock that measures the proper time between the events is:

Correct Answer
verified

An electron is moving at 0.6c.If we calculate its kinetic energy using (1/2) mv², we get a result which is:

Correct Answer
verified

Exam 37: Relativity

As we watch, a spaceship passes us in time Δ\DeltaΔ t.The crew of the spaceship measures the passage time and finds it to be Δ\DeltaΔ t'.Which of the following statements is true?

Correct AnswerverifiedShow Answer

According to the theory of relativity:

Correct AnswerverifiedShow Answer

If the kinetic energy of a particle is equal to its rest energy then its speed must be:

Correct AnswerverifiedShow Answer

Two events occur on the x axis separated in time by Δ\DeltaΔ t and in space by Δ\DeltaΔ x.A reference frame, traveling at less than the speed of light, in which the two events occur at the same coordinate:

Correct AnswerverifiedShow Answer

If the mass of a particle is zero its speed must be:

Correct AnswerverifiedShow Answer

Two isotopes of hydrogen fuse to form a helium nucleus and a neutron: 2H + 3H → 4He + n The masses are: What is the Q value of this reaction?

Correct AnswerverifiedShow Answer

Pi mesons at rest have a half-life of T.If a beam of pi mesons is traveling at a speed of v = β\betaβ c, the distance in which the intensity of the beam is halved is:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An electron (m = 9.11 *10-31 kg) has a speed of 0.95c.The magnitude of its momentum is:

Correct AnswerverifiedShow Answer

A consequence of Einstein's theory of relativity is:

Correct AnswerverifiedShow Answer

The work that must be done to increase the speed of an electron (m = 9.11 * 10-31 kg) from 0.90c to 0.95c is:

Correct AnswerverifiedShow Answer

Two events occur on the x axis separated in time by Δ\DeltaΔ t and in space by Δ\DeltaΔ x.A reference frame, traveling at less than the speed of light, in which the two events occur at the same time:

Correct AnswerverifiedShow Answer

The mass of a particle is m.In order for its total energy to be twice its rest energy, its momentum must be:

Correct AnswerverifiedShow Answer

An electron (m = 9.11 * 10-31 kg) has a speed of 0.95c.Its kinetic energy is:

Correct AnswerverifiedShow Answer

A rocket traveling with constant velocity makes an 8.4 * 1015 m trip in 1 year.The proper time between events which mark the beginning and end of the trip is:

Correct AnswerverifiedShow Answer

A console lamp in the cabin of a spaceship appears green when the ship and observer are both at rest.When the ship is moving at 0.90c away from Earth, passengers on board see:

Correct AnswerverifiedShow Answer

Frame S' moves in the positive x direction at 0.6c with respect to frame S.A particle moves in the positive x direction at 0.4c as measured by an observer in S'.The speed of the particle as measured by an observer in S is:

Correct AnswerverifiedShow Answer

Two events occur 100 m apart with an intervening time interval of 0.60 μ\muμ s.The speed of a reference frame in which they occur at the same coordinate is:

Correct AnswerverifiedShow Answer

Two events occur 100 m apart with an intervening time interval of 0.37 μ\muμ s.The speed of a clock that measures the proper time between the events is:

Correct AnswerverifiedShow Answer

An electron is moving at 0.6c.If we calculate its kinetic energy using (1/2) mv2, we get a result which is:

Correct AnswerverifiedShow Answer

As we watch, a spaceship passes us in time $\Delta$ t.The crew of the spaceship measures the passage time and finds it to be $\Delta$ t'.Which of the following statements is true?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Two events occur on the x axis separated in time by $\Delta$ t and in space by $\Delta$ x.A reference frame, traveling at less than the speed of light, in which the two events occur at the same coordinate:

Correct Answer
verified

Correct Answer
verified

Two isotopes of hydrogen fuse to form a helium nucleus and a neutron: ²H + ³H → ⁴He + n The masses are: What is the Q value of this reaction?

Correct Answer
verified

Pi mesons at rest have a half-life of T.If a beam of pi mesons is traveling at a speed of v = $\beta$ c, the distance in which the intensity of the beam is halved is:

Correct Answer
verified

Correct Answer
verified

An electron (m = 9.11 *10^-31 kg) has a speed of 0.95c.The magnitude of its momentum is:

Correct Answer
verified

Correct Answer
verified

The work that must be done to increase the speed of an electron (m = 9.11 * 10^-31 kg) from 0.90c to 0.95c is:

Correct Answer
verified

Two events occur on the x axis separated in time by $\Delta$ t and in space by $\Delta$ x.A reference frame, traveling at less than the speed of light, in which the two events occur at the same time:

Correct Answer
verified

Correct Answer
verified

An electron (m = 9.11 * 10^-31 kg) has a speed of 0.95c.Its kinetic energy is:

Correct Answer
verified

A rocket traveling with constant velocity makes an 8.4 * 10¹⁵ m trip in 1 year.The proper time between events which mark the beginning and end of the trip is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Two events occur 100 m apart with an intervening time interval of 0.60 $\mu$ s.The speed of a reference frame in which they occur at the same coordinate is:

Correct Answer
verified

Two events occur 100 m apart with an intervening time interval of 0.37 $\mu$ s.The speed of a clock that measures the proper time between the events is:

Correct Answer
verified

An electron is moving at 0.6c.If we calculate its kinetic energy using (1/2) mv², we get a result which is:

Correct Answer
verified