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 rock-frbx) 7orj-h et journeyed from Earth to Saturn. The duration of the travel is measured accoj7r)b--h ofx rrding 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 has no windows, radios, or other means for yob (,a-at b.ksr3kbe4xu to observe or measure what is outside. You wish to determine if the sha,sbt (4.e- xkkb3abr ip 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 d (5i r0iki6 0(4fw zrcezu),5zjotnn egc w50tesigned 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 (+viod3xe *althe 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 4;)d3ef2hd et(b p2udxmb.ols1ac 1e 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 7 defk)9c9 q(nu qert0relativity

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 formulatiqcwtrh*) )dj0 ng the special theory of relativity was that the laws of physi0 )w tdh)cr*jqcs 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 yo-uxf c8qofgyun0y j0.u(c)b/ ur pulse rate while in a spaceship moving away from the Sun at a speed close to the speed of light, you would find that igcj/08no0c) .y x(bfuufqy- ut 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 statio(/wpt2l3 ak1i iq :uh qqhs17enary observer, 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 def2b *v8tz:o a (/d9)uom9)jji lejmbqlined 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#

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 very high )lx*4f 3xr* pc f:g r+rdg6kgur;a n7dspeed to a distant star and back again, while the other twin remains on Earth. The twin tha:n ;)g3grrdc*f fa4xl u rk6p*7drg+ xt 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#

单选题 ( 1.0 分) 切至整卷模式 eid: 17532 对错数 0:0 难度: *****

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Relative to a stationary observer, a mo oqozb48ro :ftf k)h3/ving 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#

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An object moves in a direction parallel to its length with m: v48s3) o wiqpn;ozav:xkx; a velocity that approaches the velocity of light. The width of this object, as measured by a stationary x ;m3a;vxi):4qopon sv:z 8wkobserver,

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 tg:a gfpx-od 3-hat approaches the velocity of light. The length of this object, as measured by fa -go gpd3:x-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 the speed of light, the ma g l-ezb86c:b6 pbsp) 4.txwrsss of the particcgpp -bsse t r6xb.zlb:4w86) le

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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