6.1 special relativity 1 - 无忧得胜-网上国际课程 (5edu.win)

1#

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Two cyclists, A and B, start riding their bicycles from the same point. Cyclist A moves northwards with a speed of $4V$ relative to the ground, and cyclist B moves westwards with a speed of $3V$ relative to the ground.

The magnitude of the velocity of the Cyclist A relative to the Cyclist B is

A. $v$

B. $4v$

C. $5v$

D. $7v$

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2#

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Observations of muon decay can be used as evidence of

I. Time Dilation
II. Length Contraction
III. Absolute Simultaneity

A. statement I only

B. statement II only

C. statements I and II only

D. statements II and III only

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3#

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At a relativistic speed, a rocket journeyed from Earth to Saturn. The durati7iaj mv d0o*1qon of the trav o7j*d q0a1mivel is measured according to the stationary observer on earth as $t$. The length of the rocket is measured according to the observer in the rocket as $L$. Which of the following is correct for the time of travel according to the observer in the rocket and the length of the rocket according to the observer on the Earth?

A. Time of travel (rocket observer) is less than t; Length of the rocket (Earth observer) is shorter than L

B. Time of travel (rocket observer) is less than t; Length of the rocket (Earth observer) is longer than L

C. Time of travel (rocket observer) is greater than t; Length of the rocket (Earth observer) is shorter than L

D. Time of travel (rocket observer) is greater than t; Length of the rocket (Earth observer) is longer than L

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4#

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You are riding in a spaceship that has no windows, radios, or 0)lpv*qyqj)kej+ d u:other means for you to observe or measur:)qd*qypk 0+ )vjj ulee what is outside. You wish to determine if the ship is stopped or moving at constant velocity. What should you do?

A. You can determine if the ship is moving by determining the apparent velocity of light.

B. You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving.

C. You can determine if the ship is moving either by determining the apparent velocity of light or by checking your precision time piece. If it's running slow, the ship is moving.

D. You should give up because you have taken on an impossible task.

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5#

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The Michelson-Morley experiment was designed to measwg.+cil31sz - 3 ec;vhvm c6kzwe64y ture

A. the relativistic mass of the electron.

B. the relativistic energy of the electron.

C. the velocity of the Earth relative to the ether.

D. the acceleration of gravity on the Earth's surface.

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6#

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Michelson and Morley aqyyg0)bz3xl( 8g 2nd concluded from the results of their experiment that

A. the experiment was a failure since there was no detectable shift in the interference pattern.

B. the experiment was successful in not detecting a shift in the interference pattern.

C. the experiment was a failure since they detected a shift in the interference pattern.

D. the experiment was successful in detecting a shift in the interference pattern.

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7#

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You can build an interferometer yourself if you use the folprjdxfs-wm+x1 2ho 0 6lowing components:

A. a light source, a detector screen, a partially silvered mirror, a flat mirror, and a glass plate.

B. a light source, a detector screen, two partially silvered mirrors, and a glass plate.

C. a light source, a detector screen, two partially silvered mirrors, a flat mirror, and a glass plate.

D. a light source, a detector screen, a partially silvered mirror, two flat mirrors, and a glass plate.

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8#

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The theory of specia 3*xvc;ifpo03 olqk9zl relativity

A. is based on a complex mathematical analysis.

B. has not been verified by experiment.

C. does not agree with Newtonian mechanics.

D. does not agree with electromagnetic theory.

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9#

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One of Einstein's postulates czz o9v3l6ee/in formulating the special theory of relativity was that the laws of physics3zce9/ 6 ezvol are the same in reference frames that

A. accelerate.

B. move at constant velocity with respect to an inertial frame.

C. oscillate.

D. are stationary, but not in moving frames.

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10#

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If you were to measuret .h+(7 v sdu.rh:. or1ugeecz your pulse rate while in a spaceship moving away from the Sun at a speed close to the g7: hedzt(.s.1u .r+ruvoehc speed of light, you would find that it was

A. much faster than normal.

B. much slower than normal.

C. the same as it was here on Earth.

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11#

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Relative to a stationary observl * vq,j lab7zl940dyy.b i (cwojio)(er, a moving clock

A. always runs slower than normal.

B. always runs faster than normal.

C. keeps its normal time.

D. can do any of the above. It depends on the relative velocity between the observer and the clock.

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12#

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The gamma factor is defined o;drq v0n zcy0f)-a ro239wt mas $\gamma = 1 / \sqrt{1- (v/c)^2}$, therefore gamma ($\gamma$)

A. can be zero.

B. can be any number less than or equal to one.

C. can be any number greater than or equal to one.

D. cannot equal one.

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13#

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Suppose one twin takes a rider x wz1jzip:2*dy;uy ltdl6:2 in a space ship traveling at a very high speed to a distant star and back again, while the other twin remains on Earth. The twizuzl;2dtypj6: x wr:l12yi d* n that remained on Earth predicts that the astronaut twin is

A. younger.

B. the same age.

C. older.

D. cannot be determined from the given information

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14#

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Relative to a stationary obs+ q*yh.j brv4ierver, a moving object

A. appears shorter than normal.

B. appears longer than normal.

C. keeps its same length time.

D. can do any of the above. It depends on the relative velocity between the observer and the object.

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15#

单选题 ( 1.0 分) 切至整卷模式 eid: 17533 对错数 0:0 难度: *****

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An object moves in a direction parallel to its length wv145p pblc059d9cizp l/lt rpith a velocity that approaches the velocity of light. The width of this object, as measured by a stationa1 5p c4 vlir/dlz tp9blc950ppry observer,

A. approaches infinity.

B. approaches zero.

C. increases slightly.

D. does not change.

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16#

单选题 ( 1.0 分) 切至整卷模式 eid: 17534 对错数 0:0 难度: *****

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An object moves in a direction parallel to its length with a k mc7scc .6/a5vm, mpxvelocity that approaches the velocity of light. The length of this object, asc,vc/ca7x 6mm k .ms5p measured by a stationary observer,

A. approaches infinity.

B. approaches zero.

C. increases slightly.

D. does not change.

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17#

单选题 ( 1.0 分) 切至整卷模式 eid: 17535 对错数 0:0 难度: *****

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As the speed of a particle approaches ther 9iayiq umd6+;m: 3g xr,8unryw+/ lz speed of light, the mass of the particle udrrua6 /93wyl+q z n;y8+xiir:mmg,

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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