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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 s d+7dk an bmul-n))lk9tatement?

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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 conductew5mcx1 2mp9 hlb/1 jlod 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 3 y buxnw/-h/bsound in 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 hapu b z(t.;n/dte yh0xa-pens to the velocity of sound? (Assume that all y.;txeutd zh/0bna- ( other 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 400 Hz sound, the vg v psl)qoy*x:19m f4velocity of a 200 Hz sound through air 4o1v *9px)q: vgyflsm 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 wavel- q1riq ,si1pf,wp0elength of a 200 Hz sound in air1l,ife 0pw sr-pq q,1i 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 frequenc(hhwvw, 2,6*b s zp.gye b,sdhies greater 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 20 Hzdnub 0 r;.)*p3ay /ys:bqdfyj 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 exk/1xt*.kd ; tbjsc+all directions. If you move to a point twice as far away from the sourcetd+j/sb.tk; *k1e xx c, 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 wa7 tbrf8zl6r) bves, intensity 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. What is qqi9 ozqrh, h.8s2h/ ethe intensity at a distance 2d from theq.hh 9e/zsoh i 28rqq, 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 equally icnl v68hhu7.gq 0n/vh n all directions. What happens to the intensity of the sou v.uh/607 v ngcnqh8hlnd? 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 iugdvy; o8+ )z nnf*9 zl;1tzm/ u6ftmys radiating equally in all directions. What happens to the intensity level of the sounu zz8t+mty91;ny ngzv d/;* ) lf6fumod? 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 sound becomes louder?wxm/ffnp/ /l/yrh;m6 ,pn 8nu

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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 chx5 x4d8 fno,.;ppgv+nlzfx i6aracteristic of the sound increases?lfzx x+p 46in8g opnvd,5.;f x

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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 musical rtzk*2zrvc2g/9 m bo*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 musid*bkd8tz m ;fg rhrzzc 8+91h2cal 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 t id7kc(dyl *: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 ,v sjm;7vvn6kck 9 o+ywaves 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 dbkbkf e;e67k3e(scnhx 01ajf2)o :jguitar string and the sound wave generated by the guitar as a result of this vibration. What dk:6d3hcfj jb2ox1 k nk;es(eef0 a )b7o 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 wh7h4qp t2p;l4pw bb. xsich is open at both ends, 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 the wavelengths of the three lowen5 *3 wwdkj:l.,puro j hck/(tst tones produced by/(k5nkp rjwtuhcl3*jo:w. d, 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 , 9 eqpco4d(vhL is 200 Hz. Which one of th(vpdqh e4 9,coe following 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. Which l4oxmr 359qhjzytta-. -vcv) statement is.va oc3 q yxt5z9jv-tm-4l hr) 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 openp, 3owk lc k3.qxh0e3v ri,*he at one end and 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 len 1 fxp(,vwlq3agth L. What are the wavelengths of the three lowest ,qwvpx ( lf3a1tones 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 idjcw snwk767tz4df8p: q 14rmn a closed pipe of length L is 200 Hz. Which of the following f1n :czt 84pd4kqsmf7w7dr6 jwrequencies 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 y;a,awl c6ff bp2xi muk4:4+ eat its fundamental frequency. Which statement is cox b2wmkeif,a4;p+46:fuya cl rrect?

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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. Eac kz iww6:tp;h/h speaker produces a tone with a ;/w6w ip :khztfrequency 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, thejw 9ot tx ag068- b 9q4sgluejc9.3wpj two 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 ak):mlu k(ha,a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased:uamk,l) (hak ?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exsm1 ch, mtc)bzni1+1w- q +c)y5dfhltplains

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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 sta +leun4s 9odo*tionary observer. The frequency heard by the observer ise9 4u*dlnos+ o

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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 observerw0i6 .vbdij ;y. The frequency heard by the observe6yvd;i.w bi 0jr 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 d+k2u(vmiiz zfv 037n4p et a+souble its MACH-speed, its half-angle will decrease by a facto itkvn7p2z0+szef4 u (+i3m avr 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 kHz9y6 s h.fzzmt3g /job/ 0x/jhn in air is 352 m/s. What is the air tempetb.fs/z09g/jm/6n yxhj h 3zorature?

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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 in airiwi9kg, .ge1qv +.ljj 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 shriek whogx m:k:n .jxjhnne81(se echo reaches it 0.0250 s later. How far away was tkn .8h 1xnmex:(njj:ghe 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 echo *;kcxd4f*g3 ynktfi-m - l9qpin 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 distan2 b,jqo+h r0hzbc0 vnrp:+gc,ce to the lightning strike is aboun0+vpb c gbzh2o, ,:hjr+r0qct

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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 cq q +ge*tzh2/09rp nibliff 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 and heazza0wjmpfn m: jc67-) r the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume themjzf7 a:0nc- ) wzj6pm 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 rpl) 6 bdjry3j0pb(3g 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 aio)d ik*g c2rq,fee /xp 9(tyy8r 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 a sound wit,0)o lu8i3mthya qt3 dh 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 se(8lue tndon 2z2q7c 4ound?

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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 i, )zypfc*hjt,mkb h( .ntensity levels of 70 dB )zh,yhk t m(cpjf,.*band 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 intensz.gzcgx, w *3bq)h1tkuhme23ity level generated by ozgehq hx*,3w3.mzu)bck2 g1 tne 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 tha qe o4m;be 79bz(/vhput is radiating equally in al9ee4(/ ohmq b;ub p7zvl 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 that is radiat7yujgc 8+gy 4zing equally in alzu y4jcg+87gyl 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 1 mW of power, whi6q/ lar1o abz7ch is assumed to be uniformly distributed in all directions. What is the intensity level at a disa l7oaz rq/1b6tance 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 hy)/5fp5go4 lxhw 4z/ 1pwhz 9ka2une is 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two i egfnlw 1x4opz uwh)p4a52kz 5h9/hy/dentical 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 60 d(e*.s 6 fcp dj p8*u*nlkugp1tB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume tha86cfp uk *d.u1ppletn*jsg * (t 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 so szmc -q8/yygm7l.(nnurce is 95 dB. At what distance will iym7/. (nnmsqg cz8-ly 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 complex7vc/jfw: 2u: pf6mevr*,f dt ejy+ ;pe tone has a frequency of 1200 Hz. What is the frequency of te ;f/:jv2vrf*7p+ ,: eu6 dpjce mwtfyhe 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 900 Hz. What is the lengn lk;qm0c*s.wth of w;* mqlkcs .n0the 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 resonate in an open 50dooj7 (mgr w3 7qhsvzqw)+ tpipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in ztr77 ( +ovs0g3)q5dwwqjmho 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 end9sf1ax p zed4oi-15-fnp v t;es has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of th4t1f;-znde9xp1 -5ip aosve fe 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 ,+p8t*vwnot f,kmc 2z 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 at one end is 330 Hz. Whwzw7x, +-uumxat is the frequency u7 mw-uz+wxx,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 clob( (-r1ke bj;(jxoy8s ykv8uwsed on one end that will have a fundamenk;j8(ykosx(buj8 ry1 bew(v- tal 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 rdva.-y6rxwyz 08f*r;f)v 7 y fo vp(xthe 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)1 e77 airck6qn6y dj5o/qb uu 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 9 kp7w)ffze ,km is played when the speed of sound in air is 340 m/s. What is the fundamental freqw9,fz7pek fk )uency?

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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 is4trk p n(6)luz closed on one end. If the fundamental frequencyrn4ultz (p6k) of the open 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 i 3n4a ieagu,f*n 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 of the sources would hear no so*4aeiuf an3 g,und?

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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 byqq )d,uew :d4vlp.ix5 the 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 possi) ivw54 :p qexddq,l.uble 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. .w4rk;xow5:j dbo z. eWhat 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 frequency of a mu1yi(raco93fw h 0blw( sical instrument. Iw3 i109bcahfo(wyl (rf the tuner hears a 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 sounmxn1cu l( :rbfkd/k96ds produced by two horns are 6 m and 7 m respectively. What beat frequency is heau:m/bnkk1f 6d lrc9x(rd 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 found g*k39 dgk *)mh,mtycb to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage changehbm9tdkg*k)*,gcm y3 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 stauler/ :(kwy1stionary 1000-Hz sound source at twice the speed of sound. y ls/:ukw r(e1 The observer 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) approaches a stationarw zz*6x;tmcjtr.i7 e ,y observer at one-half the speed of s6zz*w.tm xcir, t7;ejound. 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 freque9)2w9 kwku3 damtq)pr ncy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340dk t)qk 9uw9p2)wmra3 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(w:tc5 pj0x)e k 87v ;tkgenzz/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observn:)p;kee 5z7ctgj wz08x(kvter 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 observer when a train approaches wit-.ic i e:w-hceb b*occ4uf 3.v:)avwmh a speed of 30 m/e4 fev: cu.m wo)ic3b:*vci.-wchab -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/ 6)1qfekdvg 4 )yhhz,0yvyt-jh. The train blows its 400-Hz whistley)g 10q,-6fhzydek vtvyj 4 h). Take the speed 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 s3ttj+ lqawe0 hf i+* y*rbuoi0m9)p+ w9tmpw4 tationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency 3otp9irb) u+4 00aw* +j tlyqwhf*t miwem9p+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 6,:avgpv,+v /e styqkxoe3f 6400-Hz whistle. Take the speed of sound to be 340 : ,/o3e+vp k,afe qtgv66vys xm/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 j3n5ctu. 3punyg8 ier c.utlrg7/-a40)qqm e its whistle, and you hear a -gc/.pyj3r)3ucr tg4il e7qetnq ma85u. n0u 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,a;ghbtda-iwz- s6 s:to5*ot *s qo6d Hz. Assume the speed of sound in air is 340 m/s. What is the frequency hsho:qd*ido6s s*otwt;5z6ta g,- b - aeard 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 h)m i8 z37y;zozmf-4lhis/9fuzg w (lis 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s? i zhz49z /z)-hfyl3ol;smfmiu8 7wg(

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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 spee 0w.ecm;gqkl r/he i0o8-qwt .d of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 34 m g.we-t;ih .lec /wk0qqr08o5 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 wbi7os6 z*gs5-r c 7v ,h-qiwk:v)yqcuave 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 con *.pnc7h:nsdg ;tuky7ical shock dnnts7gp7uy :kh*; .cwave 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 Sxdnw28n 1 wiu0jmv 94wtates to Europe with a Mach number ofijw2m0vu4 d18xw 9 wnn 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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