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习题练习：Physics Unit12: Sound
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 作者: admin  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is adqw04xs( dnun h*z z5;1)rp,bp v q5mdt7s1pu false statement?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is co+lpoi++(/g:6e*b kbohw dxo unducted fastest through

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of sound in a ste5ot:pgzbu;+ h el rod?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature of the air increases, what happens to the velocity of 7sn yg . fyzh3g9wq7m:sound? (Assume that all other factors remz73m7hfgsw9:gy n y .qain constant.)

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz souzaer cp 5((x)ih)3i thnd through air i5rzhthi(ie(c ap3 x ))s

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelengthv/2dtepg z8q/ of a 400 Hz sound, the wavelength of a 200 Hz sound in air i//2eptg8v dzqs

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencies great9 shlppm 2v+ry sp:(o4e pg3bhdyy.;*er than 20,000 Hz are called

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations wit:x2yggg.;vq+m uoex/zw 6.uv h frequency less than 20 Hz are called

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a sound source is emitting waves uniformly in all directions. Ig)g,c 3y /qmf 1kbdgd/f you mogd mdg)kgqc y3/bf /,1ve to a point twice as far away from the source, the frequency of the sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intensity wfb2l-pgai bad4(7 w*v2;u om is proportional to

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity of a point s e8h7bivzxf+2 c8o,d / 8: n5hrogfkawource at a distance d from the source is I. What is the intensity at:b earhh25f8n/ i78,fw8 okv+cxgod z a distance 2d from the source?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from adq9.9bk a1uc5o 4q-onqgoqr 1 sound source that is radiating equally in all direq914gq5 qooc9aqdn- o1b.kru ctions. What happens to the intensity of the sound? It reduces to

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a2z*lwty 8,fsa sound source that is radiating equally in all directions. What hapt 8y*2afsl ,zwpens to the intensity level of the sound? It drops by

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following increases as a soundvj-r7un,j 4gerrm(c.d y:2qq7ki; mr becomes louder?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speaker emitting ain*w 6 r44 d4u, wkbpin kz.d8xw9ozm3 pure tone. What characteristic of the sound incrxo4 k8 dirnip, wb63n*dwz kzmuw9.44eases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" 8sd*gdil+ f*kjr o6: nof a musical note?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitch" of a szk1w4r, b(wi musical note?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from ag7dvpcmy, em . cf543wir into water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wave 5nx u,ligza1j)qp j6s2 4yum3s are

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave on a guitar string and the sound.:c y f.py e9mp-cf/1h-qchce wave generated by the guitar as a result of this vibration. What do these two wa-hccpyc 1- y mpe:q.9 e.h/cffves have in common?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at both ends, thvn1vlv3,hugow t29ql 0c 3w- fere

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an open pipe of length L. What are the wavelengths of the threzin59+m4eihu e lowest tones produce549+ni imuzeh d by this pipe?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of length L is 200 69.0lcprzb z/dd0 sr)gx 6 tiiHz. Which one of the following frequencies will not resonate ib r6td risid)60l /c9pzx.gz0n the same pipe?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An open pipe of length L is r8kbu 9bbpx1 s zuorqsf(56v *5esonating at its fundamental frequency. Which statequ1svb b b6rz8of * (ks5x5p9ument is correct?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at one end an2s nt3b dd ks8djbn+t36yl8 h9d closed at the other, there

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pipe of length L. What are the wavelengths of the threec;f khm 0cw-uqle-gzg(upj m.4 s//4w lowest tones produced by thwg(/cf4g0s ej -;wzmc4-.ukm uq phl/is pipe?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in a closed p9. sk tw-w e /sk)aqlx8ldb,f :zhew+.ipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pip: z-xll.e8 eadq.,/kw tsfb9 whsk)+w e?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pipe of length L closed at one end is resonating at its fundamental frequency jkyfc78o4qv 2 y;qj3q(s+gj +o mb7uh. ( kq 7u+8o732f cso gqjhyb+yvm4jj;qWhich statement is correct?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands betwey bkf-7*coix0qc k9m (en two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the spe9-cob7kc0i(x q *m fyked of sound is 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats, the two sound wav;( tmlly9o asz5ia3h 5es should have

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded tou3,w d:pkwo kpaj*+n *gether and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the d+npkwpoa:u,3* kw*j tones is increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift expl7*yfbf9 bxacxu6: .jkains

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a stationary observer. y 8;u3ldvmo ;)epx oh zdy49l1 The frequency heard by the observux )8lvphde d1;3y;94lyoz om er is

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationary observecy m( b;.5rq t,fba9yer. The frequency heard by the obser5a qe9rb(c t ;my,fb.yver is

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a jet plane were to doublw -p25y,adea fe its MACH-speed, its half-angle will decrease by a fw ayd-e2,p5fa actor of:

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of an ultrasonic sound of f;,)(x7itzs /vajrk k6p lkw2 crequency 45 kHz in air is 352 m/s. What is the air tem( i xck7j/kavlspw2z 6;rtk,)perature?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the spi1gxv7l kb.: blq2ou* eed of sound in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a day when the speed of sound in air is z z 7j7 if4vxr9u 4,owd-wb9my340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back tjv9z,y d97o4 fm bwwiu7 rz-4xhe sound?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You shout at a cliff, and hear the echo in 4.00 s. The temperature idh-c1 .cse; sr :8zhb1uenx g-s $0 \; ^{\circ}C$. How far away is the cliff?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you hear thunder 5.0 s after seeing a flash of lightning, th.t8ve s)8/p q:wl cqrqe distance to the lightning strike is abou.cp:sq) e8twq r ql/8vt

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An echo is heard 2.0 s from a cliff on a day the temperature5b *vm+nt .muf is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You drop a stone into a deep well and hear the splash 2.5 s r 4p3)vx ;khzwgw7 v2plater. How deep is the well? (Ignore air resisvvh)rk4 z2 pg;xwwp37tance, and assume the velocity of sound is 340 m/s.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air of a sq,qg6q;g c/xqoq ,3pccogw)l -frs ; 2ound wave of frequency 500 Hz is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in air at :dlm4l(oi + aj$23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity level of a sound with intensi)zbpl*8 9 p3bl9 p/o+ohdtgx lty $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity of a 70-dB sounixbj5zwpx +mgt9,, r jrdrg o-6vm; 0hvl4x..d?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the intensities of two sounds with b9hac vgc.wl2e z2ji.zwx10oh */xtv((i5xe intensity levels of 70 dB ando2.gx0teix9whcw l/ 1aj.5 2vc(iz z*bv xe(h 40 dB?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines in a garage is 100 d. kmk n1v;-dseB. What is the intensity level generated by one engine? k. dmksenv1-;

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source that is radiating equallyt,ao7joj2(ps 1.ix*iq-cxrqyo 4z2f in all s7xq(i. j,rio j p-co4*ytafoxz12q2 directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source thatb3i dpeju.e8+p9i 8ln is radiating equally in ap8 ndi.up83j9 eeb+lill directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog delivers about - x:qr;sa u,i,eng. en,d(x j q)azm;x1 mW of power, which is assumed to be uniformly distrrxz ,sq xa-,ajgmn;.uxdq,e;):i e(nibuted in all directions. What is the intensity level at a distance 5.00 m from the dog?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level is 65 dB at a distance 5.00 m from a barking dogjxtn hbln0ntf t3man5+/ +/q;d k i;t0. What would be the intensity level if t0tn;/bt+d/q53lf 0mhta tn x;+jkninwo identical dogs very close to each other are barking?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m from a souu/. )vszhd:a l 0 ueldnde*m be):r5x6nd source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source r*/h nd50xe:rd d6:mvlue.us a) zl) ebadiates equally in all directions.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity level/fje; .yb ,nsx 5.0 m from a point source is 95 dB. At what distance will;f.bn ye/s,jx it be 75 dB?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a complex tone has a frequency of 1200 Hz. n*gsocqn7s6pk 49 6jr What is the frequency of thkrc 6 onsq9ns pg647j*e fourth harmonic?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonic of an open pipe is 1faxue2 p .g z :.o)jj;esv.pz6bip:c900 Hz. What is the length of the pijj ;pep.s .1:ifob g)ac6u.x:pevz z2 pe?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of length L is 400 Hz. What is thpl2hzi/v22 f)uakqy5e frequency of the lowest tone that k h22z ul2fyipvq) 5/awill resonate in an open pipe of length 2L?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An organ pipe open at bothe s8f:x9dh ck) ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the se8xs ):hkfd9cecond harmonic?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the temperz:sigi7mj h;ow7-mc. ature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequency in a pipemeqks. frvq/; p49o*f closed at one end is 330 Hz. What is the frequency of the third harmonico*k.;me f9fqvsqp/r4 ?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the length of jt4cxq1d3jt t dq0+8athe shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when td3dt+atc8jjtq10q4x he velocity of sound is 340 m/s?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is i tj86-t8ohc5:o pmqg4 ti 4ctnn a room where the temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a roo-lgtrik3( r us, iq7;pm where the temperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A closed organ pipe of length 0.75 m is played when thq.rj 4:2zmioiqd;8 j*+ q gurwe speed of sound in air is 340 m/s. What is thg4zdi w+m2juq8qj ;.irqr o *:e fundamental frequency?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes of the ccqsand2k tlf:x k8g.4lj3 /1same length: one is open and the other is closed on one end. If the fundamental frequency of the open pila:c.s gk clq8/tkf31 4xjnd 2pe is 300 Hz, what is the fundamental frequency of the closed pipe?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each emit a frownokbe)ipo;2*rtw:b t1q f8pgur5a53d+k- equency of 800 Hz in air where the velocity of sound is 340 mpp;r23to:q g-w*b 8e1nioo td fwkrb) u55a+k/s. How much farther back would source 1 have to be moved so an observer in front of the sources would hear no sound?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two speakers are placed side by side and driven by th4u4gvj3hr ( puu7okoqms u( +3e same frequency of 500 Hz. If the dis 4 p3rsu(uv+ oju4o3kgh mu(7qtance from a person to one speaker is 5.00 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies of 440 Hz and 444 Hh1(a q+ik gk(uz. What is the beat frequency?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A music tuner uses a 550-Hz tuning fork to tune the* k: 6uiouht (yos cdlor:+2w0 frequency of a musical instrument. If the tuner hears aw+ 0r ud * h6ock(s2:iyuloot: beat frequency of 2 Hz, what is the frequency of the instrument?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the sounds produced by two horns a9 jsq 2wpi9u3p:uu02f59onjifkzb7 l re 6 m and 7 m respectively. What beat frequency is heard when the horns are sounjui0 9 f5s l9 npbzu7w2qj3iuf2pk:9oded on a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin strings on t)yw uhqk za 8m g68yr+of:ir9(wo violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660ya )u8f9ho:r8 qgy km6wr+ z(i Hz is played. What percentage change in the tension of one of the strings would bring them to the same frequency?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationary 1000-Hz sound source at twice the spkjs/u z/6 e;:sp eny5veed of sound. The observer hears ans k yv/j;sez5eup:/6 frequency of

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequency of 1000 Hzr.g8 rb; ,hzvmhc;3 gk) approaches a stationary observer at one-half the spee8h gc.;r,3vzkg ;b mrhd of sound. The observer hears a frequency of

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound has a frequency of 1000 Hz. If a list4*y wz vo()kpyks59nfener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m*vy54wkfy k() nposz 9/s.)

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A police car has an 800-Hz siren. It is trazux gsp9 b4v6,*di )7 hwb*wsmveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What 9w7 ),dwb *4 6z gp*vmisxhusbchange of frequency does the observer hear?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency heard by a stationary observer when a train pa+9p d15rxxn6k*c-8hkfbx r approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed-*rx9knpa+ p6cr8f b5d x1hkx of sound is 340 m/s.

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward you at 120 km/h. The t7l4 x9;hjbmqn rain blows its 400-Hz whistle. Take the speedq4mh ;bj9 n7xl of sound to be 340 m/s. What frequency do you hear?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are moving at 120 km/h toward a stationary train.pge8 5:u7 qguj The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequen 78 :egqp5jugucy do you hear?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from youi/vzt1;thhfsijc 3/9/ uj (rn at 120 km/h. The train blows its 400-Hz whistle. Take the stt/;z3f//(cji n jhri1uhv9speed of sound to be 340 m/s. What frequency do you hear?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you at 120 km/h. It blows its whistle, and ltrt5bt,r * 1pv*wf8cyou hear a tone of 400 Hz. Take the*, r*b5 tw81tfcrvtp l speed of sound to be 340 m/s. What is the actual frequency of the whistle?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume the speed of sound in sspkg7p 467kje6t1 zn air is 340 m/s. What is the frequency heard by an observer i 47 7k66gnzjp st1kespf the observer is moving away from the train with a speed of 30.0 m/s?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume the speed of sound in air is 34ov4s pdq t/8g;yn;h k49b2 vtj0 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/9n/hkv; go; q stb 8ypd44j2tvs?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sonar is used to determine the speek)k-pfn pa) irrns3; 5d of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast nnfr) r;ipa3k- kp5s)is the object moving?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conical shock wave produced by a supersonic aircraft:,p8gladvw cpi8+w e: k6mu: 40vs.ua ar6xwz is $60^{\circ}$. What is the Mach number of the aircraft?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet flies at a speed of ahx0 ok7ulbm im*1a)p:3tws- Mach 1.4. What is the half-angle of the conical shock wav*:1o0pl sh )iwxmkbatu7a3m -e formed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the United States to Europe wi yw3nm, 2xim1pth a Mach number of 1.05 wh ym2pxw,1n mi3ere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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