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 vkdd5 4kr 0ns (qgvura-+uw.e5 qi2-kto Saturn. The duration of the travel is measured according to the stationary observer on earth asq - u4u.rd dkq05 ki5a e-n(+vwrvgk2s $t$. 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#

单选题 ( 1.0 分) 切至整卷模式 eid: 17522 对错数 0:0 难度: *****

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You are riding in a spaceship that has no windows, radios, or other))r 5n6aj0ahr d3*xkdqlygti26 de7 b means for you to observe or measure what is outside. Yob 5 k)elrd2aq6y ainhj0)6tg* 73rdxd u 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#

单选题 ( 1.0 分) 切至整卷模式 eid: 17523 对错数 0:0 难度: *****

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The Michelson-Morley experiment wa8hl zx9eo065 yl19 *xjuqooy j.au.b y+l2 tums designed to measure

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 concluded from the results of their exnvw t 8k k .mttg:xv4f*fp:8e8periment 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 interlk tm6*)jft w;ferometer yourself if you use the following 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#

单选题 ( 1.0 分) 切至整卷模式 eid: 17526 对错数 0:0 难度: *****

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The theory of special rela3y,0 negy b6xqtivity

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#

单选题 ( 1.0 分) 切至整卷模式 eid: 17527 对错数 0:0 难度: *****

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One of Einstein's postulatesg93rn:uzfd k2n6 twfc r1n7v+ in formulating the special theory of relativity was that th wnr3dt1v7:kzc +96 ngr2fnufe laws of physics 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 measure your pulse rate while in a spaceship movirn qt/t)z84w vng away from the Su4twrt8qv nz /)n at a speed close to the 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#

单选题 ( 1.0 分) 切至整卷模式 eid: 17529 对错数 0:0 难度: *****

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Relative to a stationary oh+ ,, yyaud9wzbserver, 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 as/ gj512 q+ h9t*ti51xbwzd :hrwnst as $\gamma = 1 / \sqrt{1- (v/c)^2}$, 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 ride (nj7nwg.sn2 oin a space ship traveling at a very high speed to a distant star and back again, while the other twin remains on Earth. The twin that remained on Earth predicts that ns(2w.7jng no 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 observer, a moving -xz1om b)od(d6(rdc ;0fk6wwy9ltzu 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 length1 x9mnbo )xo+f vm0fk;o :.qzb with a velocity that approaches the velocity of light. The width of this object, as meas 0o9v+)xb;1k:mo qfzfx. bm noured by a stationary 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 velo/t8blaw.7 ko)82 ed we/(4ser b6hq ydn glnp*city that approaches t dbro(q.hws4/ae8tb7nn6 k)le*ye8/2d p wg l he velocity of light. The length of this object, as 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 the speed ;6m ) auxq zkweeu4r/:rh30t0h us+ ycof light, the mass of the particl0 z6ahumr;s)tr +uk:q3 uhx40e e/ycwe

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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