Question 1

If an electron,initially at rest,is accelerated through a potential difference of 180 kV,the relativistic mass of the electron is

Accepted Answer

A)  12.3  ×	imes×  10-31 kg
B)  9.11  ×	imes×  10-31 kg
C)  16.2  ×	imes×  10-31 kg
D)  5.90  ×	imes×  10-31 kg
E)  infinite F) A) and B)
G) B) and D)

Question 2

The light emitted by an object traveling at high speed toward Earth would

Accepted Answer

A)  be shifted toward the blue end of the spectrum.
B)  be shifted toward the red end of the spectrum.
C)  undergo no spectral shifts.
D)  arrive with diminished intensity.
E)  None of these is correct.F) B) and E)
G) None of the above

Question 3

The total yearly world consumption of energy is approximately 4.0  ×	imes×  1020 J.How much mass would have to be completely converted into energy to provide this amount of energy?

Accepted Answer

A)  4.4  ×	imes×  103 kg
B)  1.3  ×	imes×  1012 kg
C)  1.3  ×	imes×  104 kg
D)  4.4  ×	imes×  105 kg
E)  2.2  ×	imes×  104 kg F) A) and B)
G) B) and C)

Question 4

The principle of Newtonian relativity predicts that

Accepted Answer

A)  absolute motion can be detected.
B)  absolute motion cannot be detected.
C)  relative motion can be detected.
D)  relative motion cannot be detected.
E)  both absolute and relative motion can be detected.F) B) and C)
G) D) and E)

Question 5

An electron accelerated from rest through an electrostatic potential difference of 750 kV would have a total energy of approximately

Accepted Answer

A)  1.26 MeV
B)  0.750 MeV
C)  0.511 MeV
D)  0.239 MeV
E)  0.038 MeVF) B) and D)
G) B) and E)

Question 6

The linear momentum (p) times the speed of light (c) of an electron traveling at 0.98c is

Accepted Answer

A)  0.495 MeV
B)  0.511 MeV
C)  1.12 MeV
D)  2.5 MeV
E)  938 MeVF) B) and D)
G) B) and E)

Question 7

An electron is accelerated from rest by a total potential difference of 2.00  ×	imes×  108 V.Its mass at this energy is

Accepted Answer

A)  9.1  ×	imes×  10-31 kg
B)  2.27  ×	imes×  10-33 kg
C)  1.67  ×	imes×  10-27 kg
D)  3.64  ×	imes×  10-28 kg
E)  1.1  ×	imes×  10-16 kg F) B) and D)
G) A) and D)

Question 8

An electron traveling at 0.980c has a total energy of

Accepted Answer

A)  0.245 MeV
B)  0.511 MeV
C)  0.756 MeV
D)  1.736 MeV
E)  2.55 MeVF) B) and E)
G) C) and E)

Question 9

An electron with a rest mass of 0.511 MeV travels at speed v = 0.500c.What is its kinetic energy?

Accepted Answer

A)  590 keV
B)  80 keV
C)  510 keV
D)  430 keV
E)  220 keVF) A) and D)
G) C) and D)

Question 10

Two electrons are ejected in opposite directions from atoms in a sample of radioactive material.Each electron has a speed,as measured by a laboratory observer,of 0.6c.What is the speed of one electron as seen from the other electron?

Accepted Answer

A)  0.361c
B)  0.882c
C)  1.87c
D)  zero
E)  1.24cF) C) and D)
G) B) and C)

Question 11

You place two clocks that you consider to be synchronized on a road 100 m apart.Your friend drives by at speed V and observes the clocks to be out of sync by an amount T.When you place the clocks 200 m apart and your friend drives by at speed 2V,by what amount will your friend claim the clocks to be out of sync?

Accepted Answer

A)  T
B)  2T
C)  4T
D)  T/2
E)  T/4F) A) and B)
G) A) and C)

Question 12

The kinetic energy of an electron traveling at 0.98c is

Accepted Answer

A)  0.245 MeV
B)  0.511 MeV
C)  0.756 MeV
D)  1.225 MeV
E)  2.044 MeVF) A) and C)
G) C) and D)

Question 13

What is the momentum of an electron whose kinetic energy equals its rest mass,m?

Accepted Answer

A)  0.5 mc kg.m/s
B)    kg.m/s
C)    kg.m/s
D)    kg.m/s
E)    kg.m/sF) C) and D)
G) C) and E)

Question 14

As an object of mass M approaches the speed of light,its momentum approaches

Accepted Answer

A)  zero
B)  infinity
C)  Mc
D)  Mc2 
E)  cF) A) and E)
G) A) and D)

Question 15

The expression relating the bending of the path of a relativistic,charged particle in a magnetic field to the particle's momentum is

Accepted Answer

A)  p2 = 2mB
B)  p = qBr
C)  E2 = (pc) 2 + E02
D)  p = q2B2r2/2m
E)   2 = 2mB 
B)  p = qBr 
C)  E2 = (pc) 2 + E02 
D)  p = q2B2r2/2m 
E)    " class="answers-bank-image d-inline" rel="preload" >F) B) and D)
G) C) and E)

Question 16

Which of the following statement(s) is (are) a consequence of Einstein's postulates?

Accepted Answer

A)  Every observer in every reference frame measures the same value for the speed of light.
B)  Moving clocks appear to run slow.
C)  Moving objects appear to be contracted along the direction of motion.
D)  Clocks synchronized in one reference frame are not synchronized in any frame moving relative to that reference frame.
E)  All of these are consequences of Einstein's postulates.F) B) and C)
G) A) and E)

Question 17

Our galaxy,the Milky Way,has a diameter of about 100 thousand light-years.How many years would it take a spacecraft to cross the galaxy if it could travel at 99% the speed of light?

Accepted Answer

A)  1.4  ×	imes×  103 yrs
B)  1.0  ×	imes×  105 yrs
C)  1.4  ×	imes×  104 yrs
D)  7.2  ×	imes×  103 yrs
E)  None of these is correct. F) All of the above
G) A) and B)

Question 18

Einstein's Second Postulate states that nothing can travel faster than the speed of light.The momentum of a particle of rest mass m

Accepted Answer

A)  has an upper limit of mc.
B)  has an upper limit of 2mc.
C)  is infinite as the speed approaches c.
D)  has an upper limit of 0.5mc.
E)  none of the aboveF) D) and E)
G) A) and B)

Question 19

When a meterstick moves past you in the direction of its length,you measure it to be 90 cm long.What is its speed?

Accepted Answer

A)  5.7  ×	imes×  107 m/s
B)  9.5  ×	imes×  107 m/s
C)  1.3  ×	imes×  108 m/s
D)  2.4  ×	imes×  108 m/s
E)  2.7  ×	imes×  108 m/s F) A) and B)
G) A) and E)

Question 20

A positron traveling at 50% the speed of light collides with an electron traveling at 75% the speed of light.The positron and electron annihilate.How much energy is released in MeV?

Accepted Answer

A)  1.36 MeV
B)  0.182 MeV
C)  1.022 MeV
D)  0.892 MeV
E)  1.53 MeVF) A) and E)
G) B) and D)

Exam 39: Relativity

What is the momentum of an electron whose kinetic energy equals its rest mass,m?

Correct Answer
verified

The linear momentum (p) times the speed of light (c) of an electron traveling at 0.98c is

Correct Answer
verified

If an electron,initially at rest,is accelerated through a potential difference of 180 kV,the relativistic mass of the electron is

Correct Answer
verified

Which of the following statement(s) is (are) a consequence of Einstein's postulates?

Correct Answer
verified

An electron is accelerated from rest by a total potential difference of 2.00 $\times$ 10⁸ V.Its mass at this energy is

Correct Answer
verified

As an object of mass M approaches the speed of light,its momentum approaches

Correct Answer
verified

The kinetic energy of an electron traveling at 0.98c is

Correct Answer
verified

An electron accelerated from rest through an electrostatic potential difference of 750 kV would have a total energy of approximately

Correct Answer
verified

Einstein's Second Postulate states that nothing can travel faster than the speed of light.The momentum of a particle of rest mass m

Correct Answer
verified

The expression relating the bending of the path of a relativistic,charged particle in a magnetic field to the particle's momentum is

Correct Answer
verified

Our galaxy,the Milky Way,has a diameter of about 100 thousand light-years.How many years would it take a spacecraft to cross the galaxy if it could travel at 99% the speed of light?

Correct Answer
verified

When a meterstick moves past you in the direction of its length,you measure it to be 90 cm long.What is its speed?

Correct Answer
verified

The principle of Newtonian relativity predicts that

Correct Answer
verified

Correct Answer
verified

The light emitted by an object traveling at high speed toward Earth would

Correct Answer
verified

Two electrons are ejected in opposite directions from atoms in a sample of radioactive material.Each electron has a speed,as measured by a laboratory observer,of 0.6c.What is the speed of one electron as seen from the other electron?

Correct Answer
verified

An electron with a rest mass of 0.511 MeV travels at speed v = 0.500c.What is its kinetic energy?

Correct Answer
verified

The total yearly world consumption of energy is approximately 4.0 $\times$ 10²⁰ J.How much mass would have to be completely converted into energy to provide this amount of energy?

Correct Answer
verified

A positron traveling at 50% the speed of light collides with an electron traveling at 75% the speed of light.The positron and electron annihilate.How much energy is released in MeV?

Correct Answer
verified

An electron traveling at 0.980c has a total energy of

Correct Answer
verified

Exam 39: Relativity

What is the momentum of an electron whose kinetic energy equals its rest mass,m?

Correct AnswerverifiedShow Answer

The linear momentum (p) times the speed of light (c) of an electron traveling at 0.98c is

Correct AnswerverifiedShow Answer

If an electron,initially at rest,is accelerated through a potential difference of 180 kV,the relativistic mass of the electron is

Correct AnswerverifiedShow Answer

Which of the following statement(s) is (are) a consequence of Einstein's postulates?

Correct AnswerverifiedShow Answer

An electron is accelerated from rest by a total potential difference of 2.00 ×\times× 108 V.Its mass at this energy is

Correct AnswerverifiedShow Answer

As an object of mass M approaches the speed of light,its momentum approaches

Correct AnswerverifiedShow Answer

The kinetic energy of an electron traveling at 0.98c is

Correct AnswerverifiedShow Answer

An electron accelerated from rest through an electrostatic potential difference of 750 kV would have a total energy of approximately

Correct AnswerverifiedShow Answer

Einstein's Second Postulate states that nothing can travel faster than the speed of light.The momentum of a particle of rest mass m

Correct AnswerverifiedShow Answer

The expression relating the bending of the path of a relativistic,charged particle in a magnetic field to the particle's momentum is

Correct AnswerverifiedShow Answer

Our galaxy,the Milky Way,has a diameter of about 100 thousand light-years.How many years would it take a spacecraft to cross the galaxy if it could travel at 99% the speed of light?

Correct AnswerverifiedShow Answer

When a meterstick moves past you in the direction of its length,you measure it to be 90 cm long.What is its speed?

Correct AnswerverifiedShow Answer

The principle of Newtonian relativity predicts that

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The light emitted by an object traveling at high speed toward Earth would

Correct AnswerverifiedShow Answer

Two electrons are ejected in opposite directions from atoms in a sample of radioactive material.Each electron has a speed,as measured by a laboratory observer,of 0.6c.What is the speed of one electron as seen from the other electron?

Correct AnswerverifiedShow Answer

An electron with a rest mass of 0.511 MeV travels at speed v = 0.500c.What is its kinetic energy?

Correct AnswerverifiedShow Answer

The total yearly world consumption of energy is approximately 4.0 ×\times× 1020 J.How much mass would have to be completely converted into energy to provide this amount of energy?

Correct AnswerverifiedShow Answer

A positron traveling at 50% the speed of light collides with an electron traveling at 75% the speed of light.The positron and electron annihilate.How much energy is released in MeV?

Correct AnswerverifiedShow Answer

An electron traveling at 0.980c has a total energy of

Correct AnswerverifiedShow Answer

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An electron is accelerated from rest by a total potential difference of 2.00 $\times$ 10⁸ V.Its mass at this energy is

Correct Answer
verified

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The total yearly world consumption of energy is approximately 4.0 $\times$ 10²⁰ J.How much mass would have to be completely converted into energy to provide this amount of energy?

Correct Answer
verified

Correct Answer
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Correct Answer
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