Physics Unit26: Special Theory of Relativity - 无忧得胜-网上国际课程 (5edu.win)

?作业考试练习?通用国际物理?Physics Unit26: Special Theory of Relativity

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习题练习：Physics Unit26: Special Theory of Relativity

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1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You are riding in a spaceship that has no windows, radios, or other meanj y/zcil:e:6h.xhm z) oe8,x ns for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at const/y6).m,j nh c8: zezxo hi:lxeant 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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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Michelson-Morley experiment was designedf/t.jce 3af+da:afsbzb i 1*,3: f wkf 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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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Michelson and Morley coni(gc/65d cakorjanm k c7o 630cluded 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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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You can build an interferometer yourself if yo4e f /)xdu7uqru 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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5#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the relativity s*fzz0. s+zfji)l td5ozn5(t principle.

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6#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the three unprovable assumptionshf zc.e 3:vx)r of Galilean-Newtonian relativity.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The theory of special relatiiw;hb0ojxk4 50h-bvg i g v49rvity

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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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

One of Einstein's pov/8nmf71l ywf stulates in formulating the special theory of relativity was that the laws of physics are the same in referewn7lyf/fm 81v nce 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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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the first postulate of special relativity.+ xu+ ji;hqmn5

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10#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the second postulate of special re xaymn:.fdl.8 lativity.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you were to measure your pulseju2ipmec/erdvm3d4z/bl) * 3, gr9s h rate while in a spaceship moving away from the Sun at a speed close to the speed of light, you would finir 9dreuh2/3, mgl p3cjde )s/ 4zmvb*d 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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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Relative to a stationary observer,*t obinq :d7.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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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The gamma factor is defined asl m)ai4bbnjv6r*7 -gs $\gamma = 1 / \sqrt{1- (v/c)^2}$, 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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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Suppose one twin takes a ride in a space ship trav4b)*luhibr)5 ( ygrys koc,/ feling at a very high speed to a d*/sg f)(u5i)y byck,o 4rlb rhistant star and back again, while the other 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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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Relative to a stationary observdt8*svsx y/iouk4h8d4 o ,rc :er, a moving 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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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object moves in auq9a; o: xf3:dufw px8 direction parallel to its length with a velocity that approaches the velocity of light. The wid:8f fp : w9x;qouxdua3th 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) 切至整卷模式搜藏此题

An object moves in a direction parallel to itfk( rrbsrl); / +w ay-0rtd0bv7 i)dtbs length with a velocity that approaches the velocity of light. The length of thisb)/yfti;(kw)lrdsab r-+ 0rt0d7v br object, as measured by a stationary observer,

A. approaches infinity.

B. approaches zero.

C. increases slightly.

D. does not change.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

As the speed of a particle approaches the speed of light, the mass of the p3(a;ik +dpvl* vnk6gbg*yw ,karticiwn+;gvbvk * kyp6 lk(,d*a3gle

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

As the speed of a pa-b4z 6hoatprs- rj2c1rticle approaches the speed of light, the momentum of the particlecr2z4 t jr-s6pa1 -obh

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spear is thrown by you at a very high sp5a3(xf s2o(9wcfrv v geed. As it passes, you measure its length at one-half its normal length. From th9v f w x(raf2os(gcv53is measurement, you conclude that the moving spear's mass must be

A. one-half its rest mass.

B. twice its rest mass.

C. four times its rest mass.

D. none of the given answers

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What happens to the kinetic energy of a speedy proton w6czf64g lf1lphen its relativistic mass dcl lzfgf61 p64oubles?

A. It doubles.

B. It more than doubles.

C. It less than doubles.

D. It must increase, but it is impossible to say by how much.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What happens to the total relativistic energy of a speedy protonshk3+a 8 vh+*kehxry,l8dr,n when its relativistic mass ne*rhh3hkl+8da +x rs,,8vky doubles?

A. It doubles.

B. It more than doubles.

C. It less than doubles.

D. It must increase, but it is impossible to say by how much.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider a particle of mass 2eo2o1iusg n-wow( g 2$m$ and rest mass $m_0$. Which of the following is the correct expression for the kinetic energy of such a particle?

A. $\frac{1}{2} m_0 v^2$

B. $\frac{1}{2} m v^2$

C. $m c^2 - m_0 c^2$

D. $\frac{1}{2}(mc^2 - m_0 c^2)$

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two spaceshipa1/d,o i ojyur8c461rbe8u yvs, each traveling at 0.50c in a straight line. Ship A is moving directly away from the Sun and ship B is approaching the Sun. The science officers on eecioo8 u ,ryy1b48v6dr u1/a jach ship measure the velocity of light coming from the Sun. What do they measure for this velocity?

A. Ship A measures it as less than c, and ship B measures it as greater than c.

B. Ship B measures it as less than c, and ship A measures it as greater than c.

C. On both ships it is measured to be less than c.

D. On both ships it is measured to be exactly c.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following depends on the obs)*6ndxqge yb2km iqm : i1 9t1h4ha:swerver's frame of reference?

A. the mass of the proton

B. the length of a meter stick

C. the half-life of a muon

D. all of the given answers

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

As the velocity of your spaceship increases, you would observ +f-hbg i*z+/)rrts*aof*arr e

A. that your precision clock runs slower than normal.

B. that the length of your spaceship has decreased.

C. that your mass has increased.

D. all of the given answers

E. none of the given answers

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A boat can travel 4.0 m/s in still water. With what speed, rntxgyd+1/(t5s xg uxvix7,9relative to the shore, does it move in a river that isxg x5 t1gs (ni+9r7 d,/xtxuvy flowing at 1.0 m/s if the boat is heading upstream?

A. 3.0 m/s

B. 4.1 m/s

C. 4.8 m/s

D. 5.0 m/s

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A boat can travel 4.0 m/s in stilc78voq;/vim z l water. With what speed, relative to the shore, does it move in a river that is flowing at 1.0 m/7 q imoc8;vz/vs if the boat is heading downstream?

A. 3.0 m/s

B. 4.1 m/s

C. 4.8 m/s

D. 5.0 m/s

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A boat can travel 4. )qy0qe+;vq8)t5x6af:mdb zlh c8mif kjr) 4t0 m/s in still water. With what speed, relative to the shore, does it move in a river that is flowing at 1.0 m/s 85)dmbtv +e4qml; hyc6z)r qikx8)0:j tfq afif the boat is heading straight across the river?

A. 3.0 m/s

B. 4.1 m/s

C. 4.8 m/s

D. 5.0 m/s

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast should a moving clock travel if it0 -,qpz 2zufcp5 wv kzo6h,c5r is to be observed by a stationary observer as running at one-half its normal ratehf zc-uz vc505,krzq, pwo p26?

A. $0.50 \; c$

B. $0.65 \; c$

C. $0.78 \; c$

D. $0.87 \; c$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spaceship takes a nonstop journey to a planet and returns in 10 hours acco5rze63kch(i:3lfbz z(o( rhxrding to a clock on the spaceship. If the speed of the spaceship isefr 3rxz:bo5ik6l (h(zh3c(z 0.80c, how much time has elapsed on the Earth?

A. $3.2 \; h$

B. $7.0 \; h$

C. $15 \; h$

D. $17 \; h$

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A set of twins, Andrea and Courtney, are initial ewii evt0wg:+1 ) kgm0 d4ze83m3/-ajabmuqwly 10 years old. While Courtney remains on Earth, Andrea rides on a space ship which travels away from Earth at a speedae3ej wa -4 ):vig eu/qb+k1m t0 wwdm8z0igm3 of 0.6c for five years (as measured by Courtney), then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return?

A. $10 \; years$

B. $12 \; years$

C. $18 \; years$

D. $20 \; years$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

One 20-year-old twin brother takes a 1:7mqaerf1-bxtm b,k space trip with a speed of 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what qbme1t r :a 7-,xfb1mkis his own age and the age of the Earth-based twin brother?

A. 20; 30

B. 30; 50

C. 50; 70

D. 70; 90

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A meter stick is moving toward7tp.3j1 kk/ i:j xpn*of +eogl you with a speed of 0.80c. What is its length?

A. zero

B. $0.40 \; m$

C. $0.60 \; m$

D. $1.0 \; m$

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast would a rocket ship d0z e)2 e9fahgtl ,rm0g4lj6bhave to move to contract to half of its proper length (as observed by a stationary, bgd4gze j0h9m)a0 ftel6l2r object)?

A. $0.50 \; c$

B. $0.65 \; c$

C. $0.78 \; c$

D. $0.87 \; c$

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The length of a spaceship is 10 m when it is at rest. If the ebu)*u-t hw srxe0xw 0gx(ne-4 s+fx2spaceship travels by you with a speed of 0.70c, what length does it appex0e( -sg4wh e2*e-rxn ustx) u+ bfwx0ar to you?

A. $5.5 \; m$

B. $7.1 \; m$

C. $12 \; m$

D. $18 \; m$

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The closest star to our soz6z t c.kl +22cgbc g8 n;no2x0dj:yshlar system is Alpha Centauri, which is 4.30 light years away. A spaceship with a constant speed of 0;2zk jzgt +:nhl0nc2 d.c b xy86g2ocs.800c relative to the Earth travels toward the star. What distance does the space ship travel according to a passenger on the ship?

A. $2.58 \; ly$

B. $3.52 \; ly$

C. $4.12 \; ly$

D. $4.30 \; ly$

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The closest star to our solar system is Alpha Ce3doeya:g7)y ipkd g2:vv oty8l 45j3 zntauri, which is 4.30 light years away.yojd 5p:gy) okzya t7l4:eg83d2vv i 3 A spaceship with a constant speed of 0.800c relative to the Earth travels toward the star. How much time would elapse on a clock on board the spaceship?

A. $3.23 \; y$

B. $4.40 \; y$

C. $5.15 \; y$

D. $5.38 \; y$

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The closest star to our soj8b0k.6a o8pvoa iar ad:p8:w lar system is Alpha Centauri, which is 4.30 light years away. A spaceship with a constant speed of 0.8.ja wad80a:p8pir o8:kb a6vo 00c relative to the Earth travels toward the star. How much time would elapse on a clock on the Earth?

A. $3.23 \; y$

B. $4.40 \; y$

C. $5.15 \; y$

D. $5.38 \; y$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is traveling at 0.85c. What is its mass? (The rest 6pl xuyd 5g.9 6ri-0vlkj/ro9 cix apjo8,w1jmass is $9.11 \times 10^{-31} \; kg$.)

A. $1.4 \times 10^{-29} \; kg$

B. $7.2 \times 10^{-30} \; kg$

C. $1.7 \times 10^{-30} \; kg$

D. $2.4 \times 10^{-30} \; kg$

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the speed of a proton if its mass is twice its rest fht 98dre;1h4)jio5 dw.m opbmass?

A. $0.50 \; c$

B. $0.68 \; c$

C. $0.73 \; c$

D. $0.87 \; c$

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the velocity of your spaceship goes from 0.3 c toa,5cnr *9sfi lgj0e*g 0.6 c, then your mass will increas*ij lg,r50 g cnfs9ea*e by

A. 19%.

B. 38%.

C. 100%.

D. 200%.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum in h 8+4nl9w fmt:z6mz1l sq czjy29a)bo $kg \cdot m/s$ of a proton when it is moving with a speed of 0.60c?

A. $1.2 \times 10^{-19} \; kg \cdot m/s$

B. $1.5 \times 10^{-19} \; kg \cdot m/s$

C. $3.0 \times 10^{-19} \; kg \cdot m/s$

D. $3.8 \times 10^{-19} \; kg \cdot m/s$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

During a reaction, an:wcpr 1o8qur3 element loses $4.8 \times 10^{-28} \; kg$ of mass. How much energy (in Joules) is released?

A. $4.3 \times 10^{-11} \; J$

B. $1.4 \times 10^{-19} \; J$

C. $1.6 \times 10^{-36} \; J$

D. $5.3 \times 10^{-45} \; J$

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

During a reaction, $1.7 \times 10^{-4} \; J$ of energy is released. What change of mass would cause this?

A. $5.1 \times 10^{-4} \; kg$

B. $1.5 \times 10^{-13} \; kg$

C. $4.8 \times 10^{-18} \; kg$

D. $1.9 \times 10^{-21} \; kg$

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much energy would be released if 2.0 kg of material was lost during a hh8 ejw m7 uwoj+c58c(reactionw8c+ e 7j8(jhuocw5mh ?

A. $1.8 \times 10^{17} \; J$

B. $1.5 \times 10^{16} \; J$

C. $6.0 \times 10^{8} \; J$

D. $4.7 \times 10^{-8} \; J$

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The amount of energy equivalentckb:k p4s2p/-zxpv b )7nvm4 g to two kilogram of mass at rest is

A. $18 \times 10^{16} \; J$.

B. $3.0 \times 10^{8} \; J$.

C. $9.0 \times 10^{16} \; J$.

D. none of the given answers

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The atomic bomb that was dropped on Nagasaki in 1945 killedj ) s g.io+w pvoc00fm:0-rzsb 140,000 people, helping to end World War II on the next day. It released energy equivale0)sgs fcr0bio:mzjv +.-p0w o nt to that of 20,000 tons of TNT explosive. How much mass was converted to energy when this took place? (1000 tons of TNT = $4.3 \times 10^{12} \; J$) Incidentally, modern H-bombs have energy yields 1000 times as much!

A. $1 \; g$

B. $10 \; g$

C. $100 \; g$

D. $1 \; kg$

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic energy of a proton is 80% of its total enerm ( :yoc4xedy3p4qq3 ivi+lz2 gy. What is the speed of the proton?z33vqoq+ 4yl4i(d: pcye2 xmi

A. $0.02 \; c$

B. $0.87 \; c$

C. $0.98 \; c$

D. $1.0 \; c$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic energy of a proton is 80% osk3 q3ozy uwd: r-w03uf its total energy. What is the momentumquruy3 dwo:k-33 s0w z in $kg \cdot m/s$ of the proton?

A. $5.0 \times 10^{-19} \; kg \cdot m/s$

B. $2.5 \times 10^{-19} \; kg \cdot m/s$

C. $5.0 \times 10^{-18} \; kg \cdot m/s$

D. $2.5 \times 10^{-18} \; kg \cdot m/s$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What energy is released (in Me,3ucu0 c7hk3 ayn /hejV) during a reaction in which $1.67 \times 10^{-25} \; kg$ of material is converted to energy?

A. $5.0 \times 10^{-14} \; MeV$

B. $4.1 \times 10^{-7} \; MeV$

C. $3.1 \times 10^{-4} \; MeV$

D. $9.4 \times 10^{4} \; MeV$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much mass is lost during a real0ylhq( 5p h q3 en)/q5ei+kfdction in which $1.7 \times 10^{8} \; MeV$ of energy is released?

A. $1.8 \times 10^{-8} \; kg$

B. $5.7 \times 10^{-9} \; kg$

C. $1.9 \times 10^{-17} \; kg$

D. $3.0 \times 10^{-22} \; kg$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the total energy of an electron moving with a spet(4 xb6aqygef*h z8 hku 95tv15j6g c9b g-wgked of 0.95c?

A. $2.6 \times 10^{-13} \; J$

B. $8.2 \times 10^{-14} \; J$

C. $1.1 \times 10^{-13} \; J$

D. $1.2 \times 10^{-14} \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are required to accelerate one kilu,px0n usl e;*nel4m:ogram of mass from rest to a 4s;eun:un, lemp *0xl velocity of 0.866 c?

A. $1.8 \times 10^{17} \; J$

B. $9.0 \times 10^{16} \; J$

C. $3.0 \times 10^{3} \; J$

D. none of the given answers

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a nuclear plant, dt:no,oi e cn50b.f4cw0h;q p$1017 J$ of energy is available from mass conversion. How much mass was lost?

A. $0.1 \; kg$

B. $1 \; kg$

C. $10 \; kg$

D. $100 \; kg$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated through 100 kV. Bva(h/wpj xb1k cqz9*5y what factor has its mass increased with respect to its rest mas1vx(hzpbjk9/aq w c*5 s?

A. 1.20

B. 1.55

C. 4.25

D. 8.00

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You are in a rocket traveling away from the Sun akjce n 7 6.u+f4u4jxqkt 0.95c. You measure the speed of lightkf jjc6u.x+u4n4eq7 k from the Sun to be

A. 0.05c.

B. 0.95c.

C. 1.0c.

D. cannot be determined without knowing the frequency of the light

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two spaceships are travelid 8at)f/x3xmyng through space at 0.60 c relative to the Earth. If the ships are headed directl /3adymf8)xtxy toward each other, what is their approach velocity, as measured by a person on either craft?

A. $1.2 \; c$

B. $c$

C. $0.60 \; c$

D. none of the given answers

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fast spaceship is traod+a88sejrfod .*aujau,. p5veling with a speed of 0.80c. How fast would light travel from the headlights of the ship relative to a sta*8.au5a,d.rpjd8ao+ o fesju tionary observer?

A. $0.20 \; c$

B. $0.80 \; c$

C. $1.0 \; c$

D. $1.8 \; c$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spaceship moves away 5rmj5 9dnfff; from the Earth with a speed of 0.80c. The spaceship then fires a missile with a speed of 0.50c relative to the spaceship. Whatr5j9f; 5 ffdmn is the velocity of the missile measured by observers on the Earth if the missile is fired away from the Earth?

A. $0.30 \; c$

B. $0.50 \; c$

C. $0.93 \; c$

D. $1.3 \; c$

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spaceship moves away from the Earth with a spee++ q0v;x z jdn0a/)4pb).ircpcff fi cd of 0.80c. The spaceship then fires a misszn)vdf4 cfa.i/0jq;bp)0rc if xc++pile with a speed of 0.50c relative to the spaceship. What is the velocity of the missile measured by observers on the Earth if the missile is fired toward the Earth?

A. $0.30 \; c$

B. $0.50 \; c$

C. $0.93 \; c$

D. $1.3 \; c$

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