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 Em8zhu.y64 ni3a. lpu tmq)t2u-x3vhzarth to Saturn. The duration of the travel is measured according to the statio .3zl mm2 3xu uz-ay.vuqn)86tthhp i4nary 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, rhn mji 0+/0smc6v) mfabvkr)5adios, or other means for you to observeim jcm b+)rfk/6svvm n0)h05a or measure 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 experimll302i 7jac csg,ps f(ent was 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 experiment tzbc(p5qvjtrr3w 9+ vi ih1+v. cs7w1y hat

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 ( hh/rr s y2w/a.:ip9mo)vdbl 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#

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The theory of special relh ;,zd a9jd1juvx l,l3ativity

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 spec:h se00 aj/qymp /iyd6ial theory of relativity was that the laws of physics a/dpqayj/6i m0h 0e :syre 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 inqp fgg*h1i9mg 8 tqhm.c;. kx6 a spaceship moving away from the Sun at a speed close to the spq 8ht m;gck.gip 61h. 9fx*qgmeed 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 observebf;+uspgro sy ,n8,*8wsdo e8 r, 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 kj:*a mekg7ybr,nb)dlc0f .upd 1j33 $\gamma = 1 / \sqrt{1- (v/c)^2}$, 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#

单选题 ( 1.0 分) 切至整卷模式 eid: 17531 对错数 0:0 难度: *****

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Suppose one twin takes a ride in a space ship traveling at a ver ow),ev s+nq;xy high speed to a distant star and back again, while the other twin remains on Earth. The twin that remained on Earth predicts that the e,sn oq;)w+ xvastronaut 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 obj; :x6kka+ivdv8m7-ot s l z+urect

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 65u8,:(ntirh 0 ;vj /kihi ff hanfuq6with a velocity that approaches the velocity of light. The width of this object, as meas:(5ftka,8 h/i 6ijhnvu;6unh i q0ffrured 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 velocity th 2u.ngx0bmch1octd0m ;lh;chv 3 q71cat approachec0d cq1h .mv um;tl2hxo; hb 3n0cgc17s the 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 of light, the mass of the y ma27p8wc5*s5 nj72vdciiu kpartic5*wy5u72v2idas i 7 k cj8cnmple

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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