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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  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 followig-tpz; qw49q c 58ffjlng is a 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 conduc61.l :6d gfdtkkj uzf9vzf((n t /trd7ted 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, wmye:a t (-ilh3f0vu a steel 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 hacag-jis y2n 5m2ma*n *ppens to the velocity of sound? (Assume that all other fa m -2an ijngs*mc2y5*actors remain 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 x )a 7w/4a sslml, vb.zsk.8ija 400 Hz sound, the velocity of a 200 Hz sound throug s sa, im/.)jw llk4.baxsz87vh air is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelength of a 400 Hz soud,y xfo:ce0j2nd, the wavelength of a 200 Hz sound in air is,o:f dcj20 exy

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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 greater e 0hd9ttm7,uo (x e1rxem4.vo 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 with frequency less than 20w u87*jog648yj 3wimg.nadpq 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 in5 j9bo k3p+hkri .ph2r all directions. If you move to a pointjhhp2kobrp3+ri 9.k5 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, int7zj u*hqym+s *ensity 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 source at a distance d from the source is I. Whaty :5qd)no qei) is the intensid:q i)q eyon)5ty at 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 a sound source that is rr trj+pm)s3 yj.)mi:d adiating equally in all directions. What happens to the intensity of the sound? I:j3)rj)rs+i p ydtmm.t 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 a sound source that iz dfec9roy2enrn8 5; -d-c2fns radiating equally in all directions. What happens to thznne ydn--fec5 dr 298f ;oc2re 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 a hs2q61t) ui8nko+igss a sound 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 emitti-gercoka8xyd 4j8t) 8a w0s)/meu vy*ng a pure tone. What characteristic of th884v wg yke)rx0)mday8* a o/e-custje sound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" o3p(z tafd4.l lk7 b,muc h/csn(.k6qp f 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 "pb)k8 du-cq2gk itch" of a 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 from6 +s7l kvvqwpdq-.mw/ air 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 wave6gh x;j*,sj+mwp0h fms 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 wave ge v;zy(qqs(*g bnerated by theqg z(;bsy(*vq guitar as a result of this vibration. What do these two waves 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, gz gq a4vwa(ejl;v 7.)there

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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 thrg0;0xy - au1r3gox uesfbi.6e wavelengths of the three lowest tones pr f0b6gr r0ag.e3iyu-u o;sx1xoduced 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 res76 wdeugp5-cx 9f e5o 3 fx-mrdm6n5jionate in an open pipe of length L is 200 Hz. Which one of the follow pje5-wr-ue n3x goi9fm7d 56f 5dxc6ming frequencies will not resonate in 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 resonating at its fundamezc8/76j qh+ lox4 ,gj y13uh jab5cmqyntal frequency. Which statement is c6c,yg31 5jzqmh huj8 xo4bjl7yca+q /orrect?

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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 and closed ahat tu4r8nbl2ho/ 0) fab hp+bs y0w/7t 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 t fb7(r;yo3kg9t ld0 nehree lowest tones produced by (ng 79etyolbkrfd0;3 this 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 pipe kc 3bhe 4g:pl85lm o 0d;e)kjuof length L is 200 Hz. Which of the following frequencies pce5;gldeo40ul8hk)kb j: 3mwill not resonate in that pipe?

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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 o vuc)*mfb w:/jne end is resonating at its fundamental frequency. Whic*cmf/u: jw vb)h 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 between two speakers driven by the rmd0d7e +y(epsame source. Each speaker produces a toned e(rdypme0 +7 with a frequency of 200 Hz on a day when the speed 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 wavez7w+p;dih -7kefn:fa ( kxs,os 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 together and a particular beat freq9 4l sf*ndv9g j2h*zayuency is heard. What happens to the beat frequency if the frequency of one 9n** ha9vjd2 4lgzsfyof the 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 explains fv c)jqslb(m x45)*kf

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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 obserthb, /dj5 ep*)bfev- q e8dyb8ver. The frequency heard by the observ)e8 ybtvq -hje/*5 ,dfebpb 8der 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 stationaa6cvg *c2df( ++mp.n +atdi wiry observer. The frequency heard by the obs6t.d + agm*vp+2fn(iwc+ icaderver 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 double its MACH-speed, its half-angle wilsdms+2: bp1 k)vybl1b-i tr8e l decrease by a f2vytpb -) +s 8lm1bkd:rbe1is 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 frequency 45 kHz in air is k883q/5vwrq t 7ibwva 352 m/s. What is the 8kv/ i aq r8wvqt3b75wair temperature?

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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 speed of sound in5kms bf 1 g.p-opsd24v 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 340 m/s, a huz7er dep 11 2ut7sy,qvf3 t9bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back t27 rq 7tuyds1ez hupfv, e13t9he 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 ))qhk leq0x6vp9d5rma5r j 5ein 4.00 s. The temperature is $0 \; ^{\circ}C$. 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 htno+8d:c4,jfrm/ mha; snmi0 8mw a 0of lightning, the distance to the lightning strihw mmihn at08jsmocn4m+da,/r0; 8 :fke is about

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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 olot3h0qdfa 25a2c ud-b w7z(r n a day the temperature 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 deed*(:1x19vjh mo2+o jq nimazep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocit*oh x emiq (1j+2vjon1d9:mz ay 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 sound wave of f4nc z(xjj ;b j2xe8a+tnj)r6irequency 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 air2 nfjl snejz0, 7)w8hg at $23 \; ^{\circ}C$ 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 afuf1 k+j/k1*h ,mpdnm sound with intensity $10^{-3} \; W/m^{2}$?

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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 +j wy9z.dlku0x2 be9yrl ; v4esound?

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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 intensity levels of 70t f1kpro .v5vwd,gje7 +v jb47 dB and 40gtvp +j r7.f4,e 7 v5jwd1bvok 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 b og+)pziv )*,cadq8 uw(5 tjvyy 15 engines in a garage is 100 dB. What is the intensity level generated b+ ),twga(dy8p5qcv*jo zu)i vy one engine?

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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 radiatingu m(( --hd tu4 bstg.zxzx.0ga equally in all directionsax(gt. uh0z-dgt-z.m ub( 4xs 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 thfoi6k*pq yi+.l lgy; +at is radiating equally in all directions* .;ii +lfogl ykq+py6 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 1 mW of power, which is assumed to be uniformly d*)gwlf1y9p n ymg66ubistributed in all directions. What is the intensmguyf*6 96p) lnwb1gyity 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:m4ux cmzg5 m1/ ged-vg3yf l6.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are barking? zyd xv3 -:ul/f 5mmge6gcm4g1

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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 sound source the intensity level is 60 dB. What is(uh h4-6vy6m, q,fz/xwzs gkq the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equal6q v4s wgqzh (h,fx-ukm,z6/yly 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 5.0 m from a poinr. qllp;dy*e2 t source is 95 dB. At what distance will i2lp.ldqyre; *t 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 f+ 09dwx.a- 2r :r .mmimokfzej8yqk4n requency of 1200 Hz. What is the frequency of the fourtmfi94k0 o8n+djm we.q 2akx.yr: m -zrh 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 900 Hz. What is the len2imv) :1s3tav s hq9tzgth of the pipe?t9sih 3zvq:m2a1 t)vs

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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 wa99wuo. pj(9vl8 oomof length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pi(oojw wlp8. 9o9amuv 9pe 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 both ecko)r j;f4cln :v t*k.nds has a length of 0.80 m. If the velocity of sound in a)t4cjv fronc.kk*l ; :ir is 340 m/s, what is the frequency of the second 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 wx 7ww5pv dn8b.here the temperature 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 pipe closed a4)jlkmw;f1i0wy) yq 85pek bht one end is 330 Hz. What is the frequency of the thir 5bqk;pe hyw l4m1fy08j)w)ik d harmonic?

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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 the shortest pipe closed onwf 2ws izqk,;j4)nx 2n one end that will have a fundajk;s w22fz, 4niwn)qxmental frequency of 60 Hz on a day when the 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 i a .azxrm(:a2)9dy54rtpqoiz s in 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 room where the t8s.3o hv9-zc a-dxrwx emperature 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 mpsppqdd3 udw1vv9 g0b4;,yx. is played when the speed of sound in air isbv3pd; dq vuwyxsd p.p9 4,01g 340 m/s. What is the 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 same length: one is open aisb o+z05xa9npshj4 c0;/l m und the other is closed on one end. If the fundamental frequency of the opej; 4i5 ch0mup sn+b 9al0oz/sxn pipe 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 frequency of 800 Hz in aby(qt 8m xmdh:gk/ 4)rir where the velocity of sox/ygmrq b(kh)4 mt:8 dund is 340 m/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 the y7/u zkjln7i1s2rf8zi h7cb- same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, which of the following is a posk8ci z2n-7lyuir 7b1fhsj/ 7zsible 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 Hi 0qf,zml7(d+i rwab( n3iksr26j-qi z and 444 Hz. 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 tu60y;pty;1r c68b0 .ub5 rc rmibzxtylne the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the freqrcbmp5blr6yixz;yc1b6;ut0y0 tr .8 uency 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 are 6 m and 7 :+7si.;lxnen t*b oykm respectively. What beat frequency is heard when the horns are sounded on a d . n sxkolb7*yniet+;:ay 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 two vio8 y,kae;u)g kp;jkhi 3lins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings would3hyu ) ja,p kkg8k;ei; 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 tw kciyys7 *lrg/ 2v25ys1j2qd uice the speed of sound. The observer hears a frsl/c* u kgyyj2 i1yqs7r 2vd52equency 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.q wm974 k h 9pc7gdczwe+mpm6 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer heawwzc9ekd7q +7 gmp pc64m9h m.rs 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. If92t*vk lyh5l l a listener moves with a speed of 30 m/s away ftvl59l h*ykl 2rom the source, what is the frequency heard by the observer? (The sound speed is 340 m/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 traveling at 35 m/s on a vqfr: 1vah v8+day when the speed of sound through air is 3r+:qfv8ha1 vv 40 m/s. The car approaches and passes an observer who is standing along the roadside. What change 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 observe)mvf dyrz*:ik(1(r .vu)dmbs r when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speedy)1*mrvv(sd. ):iz b uf(r dmk 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 train blows its 400-Hz whistle,je s+5)g k5h 1z.*xgpaoyf.qzl hoc2 . Take the speed of sound x1ql.zkhh o pjz 5,2g+a yeo s.c)*g5fto 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 k .qnz6* fwgs+0eopf.km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency0+sw6n.kg peoz fq. *f 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 you at 120 km/h. The train blows2grjoee.h s :: its 400-Hz whistle. Take the speed of sound tjs:e o: hrg2e.o 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 you hm5fq g:x; b.fcear a tone of 4c; f:5b gf.mxq00 Hz. Take the 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. Ass-:vuuo+) bu:r wzxq 9mume the speed of sound in air is 340 m/s. What is thuvou w-:q+:b r) mz9xue frequency heard by an observer if 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,:emwzw,tuz -ba*ic;p fg46 b air is 340 m/s. What is the frequency heard bywti;4zbc- b 6w, *fu:pgzma ,e an observer if the observer is approaching the train with a speed of 30.0 m/s?

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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 determin, 26 cmox,c :jqlg,wtqbx xo-8e the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the l2 cx-gm ,cxqoj8 x,owb6t :q,speed of sound is 345 m/s. How fast 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 axs.,vc.+. er qmuq ic.-cbgl :ircraft 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 Mach 1.4. What is the half-angledi p,,f 6flz.8lfw(lt 0 qinp9qew4o; of the conical shock wave fo(i, oqwnfqei wzp,;f l f.8d4llp6t90rmed?

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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 with a Mach number o,lldr;xaw5kn,/1q0 h s noch0fal0q/ s;hw,kcd 5n0h,ox 1n rl 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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