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 rocuw,mk5) o02d q0 vouokrj.+fj ket journeyed from Earth to Saturn. The duration of the travel is measured according tou,. 2o5wk orj+j0 m 0vdfko)qu 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 mz6v :ew/p wk-j .qq5swindows, radios, or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped6wz:qpwm- skj5 ve/q. 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 desihy;/6styuh*dr. qv 7z gned 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 their6q ak /ub1:vhz 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 interferomet j) g,wn.ypdqo -dd ssh3.gm*.mgm 9m.er 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#

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The theory of special relatv ;:5jzidrf j9ivity

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 rewj8l e 2s*pp-h3h sx0clpn e21lativity was that the laws of physics are th82ex*21h 3pclpw snhlpse- 0je 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 moving awae)dc xjpan-/ mlng -;+y from the Sun at a spee d/mnc-x;-pg+ ejan)ld 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, a moving clotlf*k bh1l 4u , 1ca+a-5/fg0gbf ggbmck

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 zou3s-agqrg* p t8b 58defined 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 shix47g smcp,c2t p traveling at a very high speed to a distant star and back again, while the other twin remains on Earth.ccg2tx s7p ,m4 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 objey+xsjm zj9 91ald21ss ct

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 lk+y3.bap ay)x yo/+ av*cv*ha velocity that approaches hc y3p)**k+la +yy obx.vav/a the velocity of light. 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 its length with a velocity that a5 uyd 5b8mrn-spproaches the velocity of light. The length of this object, as merd 85smyu5 nb-asured 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 approachesp 3za(v*mtssjp/+g 2 p the speed of light, the mass of the particl2s+z *pm g(sppv3/atje

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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