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 fx91 k.ef2t vho)t k,4. uhltyEarth to Saturn. The duration of the travel is meyuo4 )2le hhkfft ,t.vx.kt91asured 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 hzwvp4i mp9 1ey 9iwi48as no windows, radios, or other means for you to observe or measure what is outside.zp e8v 9piww4i 1iy94m 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 a+m) zge)uta-kciim29wqy17to 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 repk jx la;c;6x0sults 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 followi2q strzy08t) n 2ksk,vng 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 special relativity 8w aj.fmw8k/s

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 in formulating the special theory of relativity:5 zhjt oatu 9lsm8d2) was that the laws of physics are the same in lj5:9)2 ttu shm dza8oreference 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 mo z.to( byv1.fq9bf,fhving away from the Sun ,ho.fv.f1 yfz9(bbqt 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#

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Relative to a stationary observer, dzxf:g1x5 u z*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 definedtdd 5a -6bd;f 7ysy4h g )dtemp8(nde1 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 in a space ship m e:omd9 (u8e r,wpo+xr:ow5 jtraveling at a very high speed to a distant star and back again, while the other twin remains on Earth. The twin that remained on e95+p, :o( mrmuwx8oe: owjdrEarth 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 observer, a moving cr7yplt c -jot8,(2gmobject

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#

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An object moves in a direction parallel to its length with a a hfkgv3m.(x (uqlo, ,velocity that approaches the velocity of light. ,uf mvgqx3lh,a .ok(( The width 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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16#

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An object moves in a direction parallel to ita9:ch nz, imwp2,c1nc)i/vhslg)tq0g 6 - vlzs length with a velocity that approaches the velocity of light. The length of this object, as measured b6 wq- :izanl ccgzncm 0h2v,,pv1l9 hig/t))s y 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 of light, the mass ,ctg-y *oee27.t b s6aly xzwm2f)lf9of the particw.2 oyegxz f cl6,2maf *sty-l97teb)le

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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