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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://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://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 fvhpdpeu-t mjr;bvui j2 2-3aqnh 7om* l 0;+;nalse 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 conducted fastest throuuu7cv*;ou 9sh;5 guuvgh

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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 steefrwh6qsc4i kod8()gkl zzq ( )ar(g8+ l 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, whatv w8 jf;hx b(3(ha+ghc happens to the velocity of sound? (Assume that all other factors remain8+gwh;v(xb( hjf 3hca 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 H)yhk2pzsoho 2x( v;i 4z sound through2i;4(hxvh 2sok)zp yo 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 ocq+wqy;i21 vfbd j5 7ntgqlz hc/kqu3,//*fmf a 400 Hz sound, the wavelength of a 200 Hz sound in air is/5,7*zcv2iubjw;qqq3fm gthnq / kl d/ yfc1+

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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 greater2oqp5, eo y*sn 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 wtk391xgyobau.yl7st786j s kmmk+3 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. Ivfn/2mn u m/:myy2sj hut)33hf you move tosjm/uun23/ mhnm :yf3hy )t v2 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, dl)spnz s) ;7t v6mog6 *o2upzintensity 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 distan/ib uj9cum 7r36rmb0cv .zm(mce d from the source is I. What is the intensity at a distance 2d from the sourcebic3.u jbmmr7mr cv9m60u/ (z?

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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 sc k,t ky5ckrmm5 i7t g.vd3v+;ource that is radiating equally in all directions. What happens tod5,kyrc cv+km5i7vt.k 3 tgm; 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 distancm+.vql4/xgi jzh *y: yuj)o 4re from a sound source that is radiating equally in all directions. What happens to iy.og rx:mjz+*vyl j 4/4qu)hthe 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 followinba*aph .c /hr7y1w xn0kv(di-dq2: eag 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 char 6p2(/ wc1dstnhj(fdoacteristic of the sounn cd1wjh2d(t 6so f/p(d 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" of a musicsnk)x g.0jjc7 al 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 musical v(, mnooqpr9b21h n0zj6s) iw 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 wa:z kf7d n;to4u6 9 1m7dveeoofter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemen-h,16t3 l:fle(fy gh( j ecj)pg hjr0dt waves 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 genr4d31emnv2 5ju zhcq/erated by the guitar as a result of this vibration. What do these two waves have in commqhr z d4uvj/n35c2m1eon?

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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, 7i z,pz294 vvlwpjh:sthere

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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 three loqkabf5u(yeqm 54:cv hp 8c9l7west tones h9m7(bpy58 :laceu vq5 4qfkcproduced 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 annoyd,x/ yh 67k open pipe of length L is 200 Hz. Which one of the fnk/dxyyo6h,7 ollowing 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 fundamental frequency. hg2 w*9qqr / mgau4lf+Which statement iumwqagqfg4h*r 9+l2/s 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 and closed at the other, thl ox)xly9uk+x(3y0h pere

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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 wavelezr; gls 11n:fek*qp *vngths of the three lowest tones p1kfp verg *ql zs*n1:;roduced 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 2udt2+k )e5dp2 tpbaa .00 Hz. Which of the following frequencies will not resonate in that u d.ea2pb d)ta +25tpkpipe?

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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 i96drizv bp6:k 9 syboz 50ucc1qm3,juts fundamental frequency. Which statement is 6,5 qo9mzuybzprcv6buc 3ji s :k901dcorrect?

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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. *an: a/q qtp5tfeh.ra,i(bn 1 Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of:( .t/n pfr5tq a1*eabha,inq 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 soun0 /ovw pdba 59mpuj93deywj11 d 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 togetqwqv 2j rs5*f2l7 bi*pher and a particular beat frequency is heard. What happens to the beatf7v rsq*q25 bpi w2jl* 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 explndfm.e:io:t ug/p acc3sm(/0ains

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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 observeruaaoik)*ahqq :8(e hg y o5q5*. The frequency heard by the obser:a equ akq*h)hq8a*yo ig55( over 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. The 16kt.ara-i nzc7 t4 tofrequency heard by the observer i kca z1at4-n6t.t7ori s

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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 will decrease by a6v1c)kl-kpi 1il lmdi96kudgg-1-oz factor of -9k6guk1kmi - glodiid)l6clp1z1v-:

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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 aiz-xvslu+va3 7 r is 352 m/s. What is the air temperatu svvxl73a-uz +re?

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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 soun9p.*dy0 jur/pok9u lnd 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 s7i) lxq(hk+zzsf ; x;u a3u,vkound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that re xfzv7;3 lhk ,)zaxquku +;(siflected 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 echo in 4paqxvt: fq )o8dlo/+-)1op;p7 x bitk.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 lightningm mi(b 9k5 x 1hpqd:.7hwaga.k, the distance to the lightninqiw9m(7.k 5maxghp hb.1k: ad g strike 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 cli7 8ru,//x7 rqc;ybf2thef v p dqei3 f/s/.lrzff on 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 a k)xlf(jisc42c p;q,y nd hear the splash 2.5 s later. How deep is the well? (Ignores2 ci (cp4lf;kj,)qyx 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 um4qn :f w,uq*d,cq9;c 5p3k m9 xxmaksound 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 a7k/ f:dw(pkx f pksv*)t $23 \; ^{\circ}C$ 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 leve kx7ojxdr:etu22)luik *o/ o )l 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 e;eg5gg kchu(2;wa ,hnd?

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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 l53wo cii eee4*evels of 70 dB4 oc3e iiee*w5 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 a garage is 100 dB. Wkgf1r:8i xzq6hat is the intensity level generated by one eng68gk zrfi x:1qine?

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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 distancei/8v ed7;hprmvf4+ z m0ry+ov of 6.0 m from a source that is radiating equally in all direy 8m vovm iz;0pe/r+rd4+fv7hctions 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 sz 1;1du2 pxr i9ddammc37 90suzj9xinource that is radiating equally in all dired 3zudad rpc7mm;ijxi29109sz x1nu 9ctions 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 assume(uby;tawiz u)zt- 9o0 d to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the doga9b0yo-z;t(u)iut z w?

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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 dog. What wo 7*x)pv hszjy):cc2ijuld be the intensity level if two identical dogs very cj2vs:yzi)h*)7 ccp xjlose 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 d , f6u;ul6;vt hezzf+from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the f6+zt,veh uz6;;fdl usource? Assume that the source radiates 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 5.0 m from a point source is 95 dB. At what : v.wae/ea-iq distance will it be 7aew. -:aqvi /e5 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 xu,e ok9h k eyl.tr, 79gfv5uz7i5- kptone has a frequency of 1200 Hz. What is the frequency of the fou e ugk9- k 7etfh.uv,iprx,ly5ko97 5zrth 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 ikc6bis3ahf/9: s9nnh 4hhs0an open pipe is 900 Hz. What is the length of the pipb0si/43h h 9hns9 6ckshfi:n ae?

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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 l4-f)- oixg5o6rxg gzopen pipe of length L is 400 Hz. What is the frequency of the lowest tonroo4 x-fi) x-g5l6z gge 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 both ends has a length of 0.80 m. If the velocit4bx (s)k4mlkamt ,s)t y of sound in a bmtkk)tl( 4s,xsm4 a)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 where th(7 ps2kx2cn5wzq0w g he 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 gl/r j sqrgn :b58czs.0*,m o8(s pjeipipe closed at one end is 330 Hz. What is the frequencyce (gj b.j zl0n:/sir 8q8p,msr5og* s 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 shortest pipe closed on one end that will have gzi/ jmk85/fx a fundamental frequency of 60 Hz on a day when the v/5zijgm kf 8x/elocity 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 the temperature zmsd0 m u45 kf1:z)eomis $20 \; ^{\circ}C$. 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 thew vo)q7.oelw4ax,dd(c g6lf, 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 plaurzh8* 9rfum 3d(q0hiyed when the speed of sound in air is 340r 9r*imfz 0huqu 83(hd 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 opm):63 ooscmc wen and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundament:sow6c3mm o)c al 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 8 8z2g vs5qjgt900 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front vz8ggt2s jq59of 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 sa7i*+ n)yg kq ez1 7xt4-v psk-tgvw9kome 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 )kzopt9 tke* v17kqsy-xg vn-wg i4 7+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 br*p+k h zdax-6eat 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/ /zybzw.(ol i-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the insty wl b(/./oizzrument?

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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 soba n 2 *+:vi 0)m7mxv:hzvoxshunds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when z:0voa2 v+7hxsbh :n )mxiv*mthe 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 a99gahj l0w7 q8fddyh dp6(h0mre found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is pl jmd dg(w6h 9q90h flah08dyp7ayed. 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 s hk/s m9 -l8iz2rsuf-aound source at twice the speed of sound. The ob-fzu ak mrs298hi-s l/server hears a 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 Hz) appro b ajb+-o*l j2:y+yurbaches a stationary observer at one-hu- +jbyobj* y2rba +:lalf the speed 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 listener moves witq :fp.k wh1:( +ewbbp1:ckk8ye(owfd h a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed( fbwed :qe1whp1pw(b :kkk 8cyof :+. 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. r )z nb.j(/tizIt is traveling 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 change of frequency does the ob)t b/jzizn .(rserver 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 s aq0 xu1rzgm1)tationary observer when a train approaches with a speed of 30 m/s. The frequency of the train hoarm10)q zxg u1rn 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 atdjrvj44d v:w- 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you h4-v vwdd:jr 4jear?

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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 120x 6rl /aaoc5i ;fq21nd km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sou; fc1i6d lax/5r2 oaqnnd 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. jb/t7 8uvyo 0mThe train blows its 400-Hz whistle. Take the bo/m0j87tu yv 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 a x6y17+4x po xcsp;jtblows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s ca t6xp1j+p7xoy;x 4s. 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 1zjylv;ek 6q0 sound 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 speed of 0qylkv1; e6 jz30.0 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 : thk-xmle28rhorn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency hxe tklm:8hr2- eard 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. Aybx 7-) zec* * aem3 yonz;-by12u2 abveqe;ou 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 v*a-2ynzo)eq2b; exy m31ouze* ;ye7bua- cbm/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 supersowd,2d. g+jeribd fq53nic 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 cvcb pxqo4cg m*e975,ponical shock wave 9 ppce,4 v*5mgxbc oq7formed?

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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 nf6gm6shl4f-zocstrb96u/ r2 ;rx +b a Mach number of 1.05 where the aiostuc-f6mgb9r6l4; +rbs6rxzhn f 2 /r temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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