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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 followinp j( :u-sj4+ g8xhtomhg 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 condf3m )+xbs ncvi+ c;cx+;p(irnucted 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 ingb3g 1ow.hc8 n 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 tp v:)s8l0 7n.snnr7z-xkn )g;yrq dn lhe air increases, what happens to the velocity of sound? (Assume that all other factors remainvzpnn.yrnrg:08)d 7; x l - 7k)qsnnsl 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 Hoq/yhs: l.- xzr)nql,3 ftru3z sound, the velocity of a 200 Hz sound through air isr3u)fqsy-ozt,r nql:3l/ . xh

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelengbstxyc a29*jf -.4 ft: zuze2gth of a 400 Hz sound, the wavelength of a 200 Hz sound in air *x9z:a2f tcz4 jtb2s-g.fyueis

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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 than 20,000 Hnp)54m:1y4c uvdm px na 75aelz 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 frequenhb -c3o0o 3li5zgwr-ncy 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 e; hxr5tb71j:-svwijit 1vdk0 nfln 95 mitting waves uniformly in all directions. If you move to a point tit 5n:tk;nsbwv i9j017 d h51jvfr-xlwice 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 is im 1lp tfz8 tbgyw)xi2bp511)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 o;eb:khz*p66x*eh d g.:xivmd from the source is I. What is the intensity at a distance 2d f. ivox: kz*6b6;xhg* ehpedm:rom 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 radiatc)i,i vs5fz b9ing equally in all directions. What fbi5iv9z,)c s 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 a sound source that pl4 fy2*yq3fqis radiating equally in all directions. What happens to the intensity level of the soy qy3qfpf 2*l4und? 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 followia,o hubgm8,gjyi6 n(2 9ym5 arng increases as 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 emitting a pure tone. What characteristic s+7 e0vaby3kha1jq 7 eof the sounda0+77ykbhae s3evjq1 increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn.y- prufd.q3 lh 8ii2b3nix: dess" of 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 "pitcsnua +g7p7+m0v -y-yl,qej ffh" 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 from air into wat s*05scoxe 2/drtt6rcp;t a6ler

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves 4/pkhyk07:6t qkgg 0dg2xgcf 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 stri/6 k8h; moibepng and the sound wave generated by the guitar as a result of this vibration. What do these two wavesbike 8;/mohp 6 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, 0 9 f lthxn*3bkjggalof7,9 .9 tdyrk+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):ka g;xtf o,9jzjj)i length L. What are the wavelengths of the three lowest t)9ga x ,)fz:jk;jjiotones produced 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 Hz. Wn 7 pp7g4gy2kc+dx, mshich one of the following frequencies will not resonate in ty42c kdpg7 xgsp n7,+mhe 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 rw p;9dw xud mszh1wd 97f()f*yesonating at its fundamental frequency. Which statement is w zudf 7(w*d9)yf s1d mw9xh;pcorrect?

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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 atv se9t:pf9+qtvn 6 t3g 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 three lo(uu.x*wf44zh)oqh bji q4w/f west tones pri/uqwz4j4wh) (fxqh.o4u bf*oduced by 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 resona9hdc -oos59jute in a closed pipe of length L is 200 Hz. Which of the follo -s9dju5 oc9howing frequencies will 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 one end is resonating at its fundamental ,zexl 6 eaw4octt4cg:(c. wbgbjz,;: frequency. Which statement is4b:a4exzgj gl,cwwtt :.zc(o,;e c6 b 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 same source. Each:,gjz(x av2i4koim8 z speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The perm28akxz:,i 4vgizoj(son 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 twodlp1 88e,p x g4zbe3.hqy qsw4 sound waves 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 fr)u y+5ytqf*ew equency is heard. What happens to the beat frequency if the frequency of one of the tow)ftyq 5+ yu*enes 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 explainse*yx b0l)rx i a6vg3p:(tdj0 e

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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. The frequenlkqnph-;2s ( ncy heard by the observer i2lp h ;kn-nq(ss

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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 observer. The fx5 g4e0b js-(zzq6bqqrequency heard by the obses6qb-5gj 4(qq z be0zxrver 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 )o6wul)y9 ol dftkj0/ + + b3nehlvv9bMACH-speed, its half-angle will decrease by a facjuf vv6wtlo9+0yb 3dob+ )l 9nhk)/eltor 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 ultrasox2l: clre* ix6 hnpo ooz;l/e dfarx19,,ge+:nic sound of frequency 45 kHz in air is 352 m/s. What is theloc;d,x+le/g l ,rneo hx oa f 9x*2pir1z:6:e air 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 f, k8)rzh/rmlspeed 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 soungaosfo0qo 5 (c,uf1 f bl.l9h3d in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How fa,oqbc.( 1f9of 5uo30hg ls aflr away was the object that reflected back the 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 eq (.ve)f(gmhlh+fw w 3cho in 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 of lightning, the dig.aeuh,s 8 .k rmzrr-gi:x f+8stance to the lightning strike is aboutr8 g :sf erg-mhrxa+.8i ,zu.k

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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 oklt qzv 7hpcrb 3e,7;ax 8o)d,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 deep well and hear the splash 2.5 s later. Ho: p5 5vjs8,:-q qo6feqyu wgvlw deep is the well? 8u,q veo w vqy:l5s-:65fgjpq(Ignore air resistance, 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 sound wave of frequency 500 Hz islz.(8e xp px9qd0kf0r

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in airzwcn9 3tao8jrh-u:9q0az y z*asi*w: 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 levetrun6hf.jr6:ibm), pl of a 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 sou -cl-r )zgpb/:eox o2mnd?

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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 thepbqr,)+za-m-fi vb2 0y3ib ij intensities of two sounds with intensity levels of 70 dB an2j mr- f0+ 3,aybpiizb)ibvq-d 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 dB. What is the wd( kr8,b qsu,jya35l -db 0wfintensity level g3 -5wqbb,8,u s0dlkw ( frydjaenerated by 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 radiat3jmm6zs 22wdb j5n;g,pt4sdo( j u 3mring equally in all directions msmw 6;b 2m33ugdn jtr,jz45 sop(d2jis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 that is radiating equally inde-(s m jk v5r5mjr.c,-w cef8 all directi(s5 - .f,d85rcjvew-e kjmrcmons 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,.4 kdmj7jw2qt 1q-hgz which is assumed to be uniformly distributed 1.4 tjd7zqg -2qkmh wjin 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 dista1ii+yz rvnne34jf g/4nce 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to eacgn+v iz /44 nr3jy1iefh 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 sound source the intensity level ilky* +geah py-5z9 1ymcul 7,z3ee;zes 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in aeyzl79*z +eykc51;yuel, pgmz3-ehall 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 point source is 95 dB. t2wxq,iku-4w7s ,tjiAt what distance will q4uwij,tx 2 tk-w,si 7it 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. What is the s;hi8by 9aoqfy+* ww,frequency of the fourth harm98;+iyswwqbf*, hyo aonic?

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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 or d c2(e rg2.lxi(tzg1pen pipe is 900 Hz. What is the length of the pi(g.i1c(tezr22g xdlr 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 Hzo /wi9he.f9 6.cv ;ums(jwmhe . What is the frequency of the lowest tone that will resow m.sv miuj96fwe ;9cho/(he.nate 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 .7mb-acs mtz*both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the f tamsm b*z-.7crequency 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 where the tempera lsw4nhpfg+-4iyz:r2ture 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 at one end is 330 m7nw bzq*51ki Hz. What is the frequency b m zwik7n*15qof the third 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 on one end that will have a fuso 3ut*ymgu+ fkh //b/nda3 bkh /gtu/*y /fos+ummental 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 is in a room where tjo :;ni hglxvf 1o80u+he 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 tpd0o4cydv f--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 m is played when the speed of sound in air ise1.ragegb 70t 340 m/s. What is the fun ar.bg0t ee17gdamental 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:-xqi;w0 i ,z ejm9ciy, one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundmiw- ; j9ixc ziq,,e0yamental 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+o;ke iep0;mu Hz in air where the velocity of sound is 340 m/s. How much farther backm e;uioe;pk+0 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 samekow/z; 1 b.ah9cm:byu frequency of 500 Hz. If the distance from a pem:h1/zcy a u9b.;wbokrson 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 Hz. Wh88suthp ; tp5( f8xgrfsoc*0 rat 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 frequ xhy mt0x3b)p4 z.vyc1ency of a musical instrument. If the tuner hears a beat frequency ofbm)xv. 1xypzc034y h t 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 are 6 m and 7 m respecti ir:n4.+0 r*iab;)divs sc*hz rsvd *cvely. Whats*i+n b zdi4.c0:vi s*rd v*r)schr; a beat frequency is heard when the horns are sounded 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 two violins in an orchestra are foun7 7v n2(3otf-3f naukxvh f+ald to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tensu 3hk +7 3 afvf2lna-tnvf(7oxion 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 statioff qglvq he-.-g2t ib-7k*7xknary 1000-Hz sound source at twice the speed of sound. The observer hears a fre7 7 f.q-2ekqthkx*- g -lbvgfiquency 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 freqmpxb, zk5,1pa uency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. Tap,pkbm zx1,5 he 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 listener moves with a speed of 30//amz).c yq2ggavxh3 m/s away from the source, what is the frequency heard by the observ/3q.) c2aagxzgh / ymver? (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 day wv*d, w z9u-f.a tckxa6hen the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadsid t9*zvfwda k6u -.cx,ae. 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 observer whmqzj i vtn 9mm)260vc/en a train approaches with a speed of 6q)zmmmt j2n/vc 9v0i 30 m/s. The frequency of the train horn is 600 Hz and the speed 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 41h7ur 0lt bdfgj*7uu200-Hz whistle. Take the speed of sound to be 340 t 2r7u1d0*jbuughlf 7m/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 stationa i,ylo7unn rrh;g-wk :y7(ji:ry train. The train blows its 400-Hz whiw,(kl j:gu7irr :-n;ynhyi 7ostle. Take the speed of sound to be 340 m/s. What frequency 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 1efu+rw 0 pkz2,huuo w7a9 s2-cweo w:,20 km/h. The train blows its 400-Hz whist72zc9 uf0- koru w+ o,s:e 2e,whupwwale. Take the speed 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 bla)r /1z8krcwkows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whz rrk1w ka)c/8istle?

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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 Hzlx l3hm(1tt4u+geki e) e-i imaz;/ y7. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer ikmlitg )7 ethmly3/ e1 ;axeu-ii +4z(f 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 .q kx;7sej 68gymsia 7500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency 6;qe8.gxy7a7kss jim heard by 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 determine the speed of an object. A 40-kHz signj)-w ;nf r*pvnal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the o;v *fnnj- )wrpbject 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 siies7 : ip;e4 t137i8ylmeg dwave produced by a supersonic aircraft 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-angle of the cvvvsef9aoa+/3*,b1 7 p vchfnonical shock waa,+fov3s v bv v*7ea9pfchn/ 1ve 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 flie6hy0*,ooo h5te3 1j ldxonmv 1s from the United States to Europe with a Mach number of 1.05 where the air3 hn6 eohyox5vj 0od*1 tml,o1 temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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