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习题练习：Physics Unit12: Sound
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 70，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test70.html  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。
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 游客未登录  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 a false statemen q +nqj rv blxqb:o*90:f3uoc1t?

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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 conducted fas3j3k/yt l2h)zm.mbe atest 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 steel rtg)te,0fob6lo 3e* +3mnyn sk;xzy z)od?

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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 increaseqb,if74p67ra l xy+bos, what happens to the velocity of sound? (Assume that all oth+7p7fx by r4, qo6albier factors 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 a 404-e xfh(af d5b0 Hz sound, the velocity of a 200 Hz sound throughh4x e af-bd5f( 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 sound, the wavelebu+pd3ujzde)ig qgj7d 6:)(zngth of a 200 Hz sound in ug +ddep6j:gqzu d)37j z( b)iair is

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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 20,0007u iy.epu;gr;lw; x /e 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 th 5m+ k+ol;:o v.f (i tzyxo5b)qvah.bkan 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 dirxwmz zopor6;;:urw4 84qa 7axections. If you move to a point twice as far away from the source, the frequenc7 8warz;:opo r4uxqz4 6awmx;y 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 p nodr- vd6e o/n)vm*z-roportional 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 is4+ fl0kf us(2lgs4ka v I. What is the intensity at fs sv k4guk(2+afl0 l4a 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 radiating equa;o nydow1r1b gx*e q50lly in all directions. What happens to01on deg*xywbo;1 5qr 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 is radiating equally in all dijyd)r-y if )wtyu.2+arections. What wf yty2-)j)d+ ria.uyhappens 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 increasel4)z:in:i2 5 e dk*orygl4* tqpzf*i bs 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 emittinv,qs abkw(.1nmkjlq,c 3rf4 z 52gu+yg a pure tone. What characteristic of thwq1.kbajlum5 zqk4n,( f ,y23gsrcv+e 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 "loudclugi7bn2juhwe7 36g v 6 :km,ness" 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 "pitch" 6 l tgtlq/:e*fe q9(nzof 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 a 8ipp8z)d k (0 xky.1rlkey ax8ym6-lair 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 wasuv.nu+*;sp v ves 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 sounxcgn 4 6i46mx0q*kh kkd wave generated by the guitar as a result of this vibration. What do these two waves have in cq64xk6k0xgk*4 hnm icommon?

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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, th j4qmp 0 msf jlm;dotxq34-61qere

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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 mg+5cj fr,55 3 segbuqof length L. What are the wavelengths of the three lowest tones produced by this pj fu355g5cebms +g,rq ipe?

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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 2002tq;zvcb76emu y j+500c idg h Hz. Which one of the following frequencies will not resonate in the same pipe? v;duc ih y05q06cm7gj2 ezt+b

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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 resonatite worz381j s.ng at its fundamental frequency. Which statement is corr.3etzor1 jws 8ect?

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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 anda 2z bz9:hf(fk 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 v+u.-/.c)xb+ka8 c y 2; wp hyeydzcbq/lio1lwavelengths of the three lowest t.b18+pky2.-/ wd vzcal u/c)cyqi;o+xebh ylones produced 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 resonate in a closed pipe of length L is 200 Hz. W3n,-3q :t n thtywwpz6nga s.(/q0 nwnhich of the following frequ3t-w6gnw/(nsqn.n 0y :ap t q3 hnw,ztencies 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 sn2ypjul,cg9,7rr. xat one end is resonating at its fundamental frequency.lxr2js97 ncgu .yp,r, Which 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 th,c 6fqnlqbq mhco8-vx2846;6p dmqkee same source. Each speaker produces a tone with a frequency of 200 Hz on al84n-xcf; cd8k qoq m66heqvmq,2b 6p 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 waves should96d:(j 4 f.p. diuq-gkcwbs1uedt+o i 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 s d hcr,l45lx:aounded together and a particular beat frequency is heard. What happeac5,xdll 4h:r ns to the beat frequency if the frequency of one of 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 explai *(w(gdy ka:hvns

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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 frequency heard (qt pst 89vld4*w4t;ol-mi *hxg /ehdby the observ*otv(4 xl he l pi*-4tdwmhq8 gd/t;9ser 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 observer. *duc e1q(,wel The frequency heard by the observ (ucew,*dleq1 er 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 t 8jvg*zfnxr6ekq.l :;o double its MACH-speed, its half-angle will decrease by a factor oev6g*f; l:jr 8q.nx kzf:

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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 fr*lges,;- tqs sequency 45 kHz in air is 352 m/s. What is the air temperats,;gqsets-l* ure?

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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 6ly k6zkr yo4c9ag*,uof 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 340 m/s, a bat emits a 5ktl)fc91 k wn ii62qlwk c)a6shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the 5lt2cli w ciwa)9kqk)f 6 6k1nsound?

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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 rf5s8vyz- hnt) ln m(p1;- nvithe echo 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 ady5;hf wv i 7sf/*xoh/agn. .s after seeing a flash of lightning, the distance to the lightning strike xvfng7h*s ohfyd.5a /i ;aw./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 on a day the lp:bm;+weys*uki .w(m*p ut( 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. /4.ek tp ,daui u2o+ uojmg;4t How deep is the well? (Ignore air resistance, and assume the veloci.4 jut4+/ke agiu2dp,oo mut;ty 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 t/zj))jh rj7u5g z2zsw; hvyz+*ejj; 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 aiw: s k,hve3kz ges ))osq.p 548hvyl+sr 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 intensit (sqm fo8ssk :s4z.a2qxn, k2iy level 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 aciwe30vmw h-pxvk.( 8o--f sa 70-dB sound?

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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 intensitiesv kd*l;.d6ik 7 .vwcwnmxm68u of two sounds with intensity levels of 70 dB .*kv;v8 wd cwlki 7 mudxn66m.and 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 n f7i2mx foy/vylr. c/ri.(*ja garage is 100 dB. What is the intensity lev2 iyx .ro. mjifry(ln/ c7*/fvel generated 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 radiating equally in ol yrkj,(s.3okl;le* all direction* 3l j ykoleols.rk,;(s 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 frommqnbjpm voxg gw0:o ; *lcq, ic;2-1o. a source that is radiating equally in all directions isc1.v g0o;jn;:obl* mmq-o cx ip ,wg2q
$6.0 \times 10^{-10} \; W/m^{2}$. 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 r1i /nsp fph, jsw( 1m)0h7gkjto be uniformly distributed in all directions. What is1kgf1phwh jp0,j/n) isrsm ( 7 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 barki7l wa-,n/oyro24zwy rng dog. What would be the intensianol7 rwo y,wy42/r-zty level if two 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 sound source the intensity level is 60z*psl9ky j6)u dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiate p kzj)u96ys*ls 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 lever z51(f nop2qsl 5.0 m from a point source is 95 dB. At what distance wipznr2os q(5 1fll 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 frequencyu1) sq(x: e:/ h8* dgnzdkj.ms *nb tdqa(/kru of 1200 Hz. What is the frequency of the fourth harmonicsgb(qx jus*zd: */:) ane(kdrdh/1t q.m nk8u?

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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. Whiq a/w7m vjy;.at is the lengty7mv;i. qjw/a h of the pipe?

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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 r2lmj,w +jn 6ckesonate in an open pipe of length L is 400 Hz. What is the frequency ofj+k2 jc6nw l,m the lowest tone that will 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 bot1rzm *qc8/wqth 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 second harr/t*1q zcq 8wmmonic?

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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 temperature ism1 mdb0m98 nl(/fultd $20 \; ^{\circ}C$. 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 ygc d(8o:g8d ln5zv8u kxckbr w) 2)mt iy7/x1330 Hz. What is the frequxk( yu /l 8g2cyo mdd) )75k8x r8gv:1zbitncwency of 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 short t 8 em)a0+c:khfize(lest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of +f8m(t0l ahkz)i cee: 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 the temperature fn p sk;4s o3tid+ j8p7uf m9.,)uvzdvis $20 \; ^{\circ}C$. 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 ctdz:g kax nl9w0y5fcm 0v3v3ecz)((in a room 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 nig9 hcr)jg:3 jgilnb44x) .y m is played when the speed of sound in air is 340 m/s. What is the fundamental f.b g 4)n j:cygnj 943grli)hxirequency?

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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 and the other isk+q0*iwlcu9s ; r8xds closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundame;cdur skl8i s w*+q0x9ntal 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 air where the hjwxdg k1t) w9-0 sn0gvelocity of sound is 340 m/s. How much fa0gs1 -)h0tngw kx wd9jrther 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 .;)f;mtevao-d3tpvhf b:80 r:pwel fby the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detf3.he o0 vabfdltve:8m pwfr);:tp -;ects 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. What is the beat6qjg4ywj /0;h w fs9oghm+ :zx 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 tlo4x9r7tsw5o-j42ip 4bthi s)n t qk9he frequency of a musical instrument. If the tuner hears a beat frequency of 2 tnps)oj sk ib9xih-9qt2444w75lr otHz, 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 hor k-h2je/zdvzhqr( :*f ns are 6 m and 7 m respectively. What beat frequency is he-:r/*2(zd jf vkzh hqeard 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 t f+j0,.mz+hqs*swb ucwo violins 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 tensionz+u,sw.b+ fqj*m shc0 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 th,ccia r ic*3kdflv;*+-l vy9 *uq+x lye speed of sound. The observer hears a frequency* 3,lcya+r v *lcvufxqyi;ld *c-ki +9 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 henw khd 20((oHz) approaches a stationary observer at one-half the speed of sound. The obser ((0nhkhdeo2 wver 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 listilr wj;* vo:w5ener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed 5w jw*;r:vio lis 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 o8 2+cloa)lhiyn 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 change of frequency 2l+)i8layhc odoes 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 trains3sn 1qrjv:e 0 approaches with a s0q:j1rsvns e3peed of 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. vhw5hgt 0/g0qThe train blows its 400-Hz whistle. Take the speed of sound wt0/v5ghqh g0to 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. The trainqan -5s ;t4a aik9ha3v blows its 400-Hz whistle. Takanqa;94vs t ak3ahi-5 e 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 120 km/h. The train blows its 4007za vojsq7aog07no v 6/6 y4ei-Hz whistle. Take the speed of sound to be 4 asz7yo0jn7q/vg7i ovo6ae6340 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, o .njs)h (:g5j /qicp/kupvh)and you hear s.pp jq5cnhj): khi/o)ug/(va tone of 400 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. Assume the speed of s5g/nc xvg/t pzj6hj:yq sj0zl ,/z4)c ound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speedgc/x 56 /t zsvl /czjhy0zj, jp)4gnq: 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 ishcg9d f ak1k (,jj:,yw 340 m/s. What is the frequency heard by an observer if the observer is approaching thwfdj:gc ,,9h a1jk( yke 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 signalv*eaafnxl/s4np, uko xz0z49 . hp u10 is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. *l 0poupfzx0haz./ xk4a19se 4 nvu,nHow 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 supervbb6f9c5m r5t end) 4gsonic 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-d:4v/p 8odrln angle of the conical shock wa/nl4po dv:8dr ve 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 Uzrl x) -wqth )e7b1. /s-eiorwnited States to Europe with a Mach number of 1.05 /.br-wo x1 el s)hetzi)-q r7wwhere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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