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 spe5--yipq -u bq5+4 tdjrqkq p/hed, a rocket journeyed from Earth to Saturn. The duration of the travel is measured according to the stationary observer o+q 5-iqkbhqy 5 ru4q/p-jpdt -n 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, raddk 94noq3s 1rqb9e cw2ios, or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at cons9cobqe nqr412kds93 wtant 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,7hj ncfyg qem/ 25nee/cm2o( 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 v*6 wt k8(6)ndu2hualmvs1i7 l6 ooil 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 following componen4h(5y 7 kougvwts:

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 reoftn cmj o 5.8 z9f-,ny4shqn/d ,pya7lativity

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 lz 9,p ,5n;g:p+uxn px6ke bxprb+7oqin formulating the special theory of relativity was that the laws of physics are the same in r;ok 6 qp5+pln :g7zxbpnb, ,xre+p ux9eference 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 sizqm n3u4 +eyi( l5sr 9de.w6zpaceship moving away from the Sun at a speed close to the speed lz +ds3 ru.y9nim6 wq5i4e(ezof 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, a i)u6.emgp294i yw,d8 ukqdn nmoving 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 defin)+ e)7l4snd mgqdh9j wt6foc +k0-mzb ed 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 sfea 7* da2 y0nhpou,di-jt h:0pace ship traveling at a very high speed to a distant star and back again, while the oa-u:tn0io,yjhp07 e d* 2dhafther twin remains on Earth. The twin 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 observer, a moving obje0pkehhu*0 )f9 pf3wr vct

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 pa)b1qa kl xek u+yky-j 78ci.0+ hedvz- o.zvl;rallel to its length with a velocity that approaches the velocity of light. The width of);. -a8x0k o 1vuvb-l.ci7z eykq+yh+ dlezkj 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 parallel6pkj).p*db )yo 1 )qxgil rk+4jpij/z to its length with a velocity that approaches the velocity of light. The length of this object, as m 4).6 q)*pxz +yl iij1ojkkbj/pr)gp deasured by a stationary observer,

A. approaches infinity.

B. approaches zero.

C. increases slightly.

D. does not change.

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17#

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As the speed of a particle approaches thee yy2h 10xghp4 speed of light, the mass of the particley 1gx0y e2hh4p

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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