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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 sta*d lq8a 29cumrtement?

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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 conduct 0qssw obeuy 19hycil.-2k8d 3ed 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 soundp .y/b:wf(x5* l sqedj 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 4koj 3:o0k7 tyuwh/ dsincreases, what happens to the velocity of sound? (Assume that all other fajsy/ 3t4 do:ku0owh7k ctors 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 velocity of a 200 Hz sound throueapzy(kx t 28pw8g 2t0xk (tg0p2tz8ep2a8 wy gh 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 4007herdpn+eu c0:o a6j. Hz sound, the wavelength of a 200 Hz sound in air udnh cap:. 7e0jr+ e6ois

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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 gr .1ccuij :mp: 0gme90q83cs gnuhms5deater 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 witlet0u66c 6feeb-3y, s+blroe h frequency 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,7q9(uvly9u+ im hdej emitting waves uniformly in all directions. If you move to a point twice as far away fromveu y+ju7mq di h,l(99 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 *)d 5 ptydaj:nt*imm5tqm:x -fg ,i9lwaves, 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 p841kc ) 2n v(6mnzvy,fnwpewtoint source at a distance d from the source is I. What is the intensity at a distance 2d from (c4v1,nvm wzpnwtfyn 8) ke62 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 radiatinr al,jn4*jy 5x,,sdvez1mc+ wg equally in all directions. What happens to theza+n4j esy, 5lc1,vj wdx,rm* 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;jv;h nt.uz-wc/z fd/ direction.n; /zhjftwz /c;-d uvs. What happens 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 increases as a sound becoln6)n hld 9pl)mes 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 5zyy 9 ebp90rua pure tone. What characteristic of the sounzy9eruy5b0p 9 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 musz6ln7 wrmy .f9wf )e:1+pf-uih( vitk ical 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 "pitzrwa +j+oje) , hzo5ubhmer/;vl 6m(9ch" 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 wataw-k jr+e 9 ea ;xfxg+f;*rvx8er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavntdl*odx3imuu mdja 2 ;+(;m: es 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 s570q+z8a, kupilz-wifz . eo eound wave generated by the guitar as a result of this vibra . qpzfaezu5e7-0l+ioik,z 8wtion. 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 ope; u /2quo-e ;ma7llpd n7ty*ocn 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 waan r7hu-n45davelengths of the three lowest tones produced by thir7nad4h n a5-us 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; 87xl9-jmk0 ljrdbyj Hz. Which one of the following frequencies will not resonate in the7ll0ym 9krjxd jb8;j- 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 ri( hete2z6sf19 p6wt mesonating at its fundamental frequency. Which statement iipt1(t zf s2hwem9e66s 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 ez *s2o+ju bqg(-rct1wdn( a o1o+rf+ is open 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 length L. What a7;kuxo+g znkq v781itl*80sayzhe n 2re the wavelengths of the three lowest tones produced h*i8ezky8ln71ogxv2s+qz k u;at 70nby 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 leldl 7(m;e qh-uy; uw1rnn3s) gvs-3dg ec+:scngth L is 200 Hz. Which of the following frequencigue- d c;y hns1q v7us-cne)+l:grdwl(3s;m3es 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+cbf5 .t6)pei5f g 7htcws* f jp8(khn resonating at its fundamental frequency. Which statement is correct* 5btwhfn)f8e+h75ippk(6c s cjgft. ?

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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 drivenaq 2jtb2 wu1)k i.m,be by the same source. Each speaker produces a tone with a frt) 2eq b mw.j1u2kbi,aequency 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 beyzdx zqo+ x+cqjh79c37 y3e*i6 c:aw jats, the 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 p b2s (d6wv/mgand a particular beat frequency is heard. What happens to the bea2s(b/gd pwv6mt 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 ex1+ duwpwzory nh tu-w+r18i+4 plains

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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.9 u4+b qpvg1d;b*vymr The frequency heard by the obsempvb+d4by;u1r*g 9q vrver 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 deparyc;94s2ukl8 (qs lahwts from a stationary observer. The frequency heard by the oc4ula9 2qk hs8(ws yl;bserver 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-s 02kxl8pv4ni cpeed, its half-angle will decrease by a factor of:8c2k0l 4 nvxip

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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 352 m/sozsi*f/16ti h. What is i i 1*ohsf6tz/the 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 speed of soundgbkq6s 9(yuy5 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 jitd39-*bi1uhff g: fin air is 340 m/s, a bat emits a shriek whose echo reaches giuf3ff i9 *1d h-jt:bit 0.0250 s later. How far 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, andmtd lwi2 9)na ,k1-oivp40 q1qrwaj5yszx 1z/ hear the 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 s after seeing a flash ofbs3+ e -lrs;hkkr+t /q lightning, the distance to the lighs 3-he++lt;/rk qb skrtning 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 cliff on a day thw-w2 hg:cw80whrat 4 ee 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 a3c-djn-vbg*y*/yxs lh +8id7sk k1 fqnd hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocityygfi c8 xsyb1*3k- vj -hlk7+d/s q*dn 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(4gerkz .7p to 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 aquwu5 fc2ufoat s 35y+ 9tg-y:ir 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 sou*6el0yjpwea0.fw4bjdq 0g - d nd 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 soundg* w.wps1kxg,+q*zn i ?

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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 int-t6(yg1v69 xtkd in uwensity levels of 70 dB ani(u1 vkg y6- ttd6nw9xd 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 inteax:zqorn6ps i*nl88 8 f (l+avnsity level generated by one eng*z 86n+ 8n oqpa:8f xllisav(rine?

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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 fr6j b 4nrkzv/c+om a source that is radiating equally in all direcj+4kb/ zrnc6v tions 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 9h1geda6ibf uc.5+umr hr( 9,g tkjc;radiating equally in all directions kdjg1turgc6 .+9auh ,(b cmrifh95 e;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 9 pkv+,nv.ml zpower, which is assumed to be uniformly distributed in all directions. What vnk9pv,m. +z lis 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 bar cr;1 gc d2uv.)k*)f1p24plh m xtscsxking dog. What would be the intensity level if two identical dogs very close to eafc1ds;x24 s. tcp rp)vm1gc)2k hu*xlch 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 le+bk c izdk655yv f5c-i hwac(,vel is 60 dB. What is the intensity level (in dB) at a zh+cw, kiadv5 fccy5kib (5 -6point 2.0 m from the source? 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 a,rtw8v5 0q +s*nkinalevel 5.0 m from a point source is 95 dB. At what distance will it bv+ rqn8aw*ntia 5k0 ,se 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 compx3np71u. 7 vqbprx ss*lex tone has a frequency of 1200 Hz. What is the frequency of the fbssqppv1 u73x* xr. n7ourth 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 thirda9+y6muqc q0-o esmq32 xs y)t harmonic of an open pipe is 900 Hz. What is the length of the pipe0)smc-us9 o q2eqax6ymq t y3+?

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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 5hq uzkx v+99))cnqrnL is 400 Hz. What is the frequency of the lowest to5)qnknh )crv9z9uxq+ ne 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 velocity of sou*u4r 9a1fj7 )j mja*,o6l)qkunr4h mp/htwalnd in air is 340,krt/h 1u4l4 7l p)aur6 jmo*9ahqfnj *am)j w 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 whwd:h dv2x1t-hszj- u1 ere 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 frequenoyuxa6w ae+f2 2o9 w5rcy in a pipe closed at one end is 330 Hz. What is the frequency ofw u+w92oryxaoe2 a65 f 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 shortesb,x1mf adp/:ht pipe closed on one end that will have a fundamental frequency of 60 Hz on a day whe:,hp/am1xbd fn 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 the zfu crzl( *)9uhzzk)3temperature 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 tdd hvd8/faz-i 8 -qgg;he 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 played when thedl7c-6rox rt* speed of sound in air is 340 m/s. What is the fundamxd7o6rr *lct- ental 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 lengtbszkwgqyyrj 8) ;+ *h5h: 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 fundars 5h8;yk * yj)wb+zqgmental 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 npei 73+ g(ed,iyl:v.r* httyvelocity of sound is 340 m/s. How much farther back would sour: 7*t+3ylp. d ,ihgyivr(een tce 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 same i qi.0zy:9 re0 6yiwlsfrequency 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 possible t6e:yi riwis l0 y0.z9qhe 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. Whabfxbc2ik8.p, d 9/ev x1k:bzx t 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 oc sb-.uv0:mo pf a musical instrument. If the tunum- :.0op vcsber 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 sounds produced by two horns are 6 m and 7 m mtbfc.b;t* vrbh ;j5;p wf5pvo,q2n1respectively. What beat frequency is heard when the horns are qt f rj;; m*p5w 2c ;v.15hobntbbfp,vsounded 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 os; lv/46xtdavsn4/ yqnb42j wrchestra 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 would bring them to the same frntyqsv/64v4jb xldaw4s n2 /;equency?

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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 state fzh+0 wabe;:ionary 1000-Hz sound source at twice the speed of sound. The obs+zbeha 0;we f:erver 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 frequen t -)7sknsl8fsj jjx90s/,li lcy of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The obser)sis njs7lfl sjt9/jk -,xl80 ver 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 ei: tbwk mgj47 yz/-g41000 Hz. If a listener moves with a speed of 30 m/s away from ty7beizgj/m :g4tw- k4he 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/)q6m hz8p2lihu88)m e,z qbphs on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observem8qhp )z hbeu,2m6zlq ) 8hi8pr 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 obseeem j yktjg+ c n+)5ilm6:z3kg3w0j o:rver when a train approaches with a speed of 30 m/s.m3ze jgjoj tw +migck03:ly)6:5+nk e 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. T8zjdm2pg6 l 1am;a+x;fmjx ; ghe train blows its 400-Hz whistle. Take the speed of sound tox;;f8 xmpjagam2g 16 dj+;lmz 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 tqk31i bqeu.0 8fhq u7qoward a stationary train. The train blows its 400-Hz whistle. Take the speed of sb3q7.qq 1i8k0q hf euuound 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 trai97mm,/( nnj ln2ekbjtn blows its 400-Hz whistle. Take the speed of sound to be 340 m/7tmje/m 2 k n,nb9ln(js. 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 whistleq 6 prlkq8 hg)0ni 0cxgld)08dbk :q;u, and you hear a tone of 400 Hz. Take dq xcklqg8 0)ibg hqu;6kl:0r)p8nd0 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. vzxr9:*0gl; : etv l;mdk pyuebg2(*aAssume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train withpg;:gvl*v e2; *t9z a r(b0ydmkl:eux 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 air isnil( p cal87v7 ro:r8g 340ir v c(l r77l8gno8:ap 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?

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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 det9 q,cr x+v jp1i)ull8iu bt8hy/ ;r1jjermine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is ret9+lix8 c,pqr /buirlh1)jjty1jv 8; uurned. Assume the 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 exj (+awy6e l0)g vrywejfo rt/xr +5 ;b4+fz(shock wave 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 conical shox i3ijvg4 u07ock w 3x4giivo70j uave 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 t8ii ftmzc* t :5v.zkh1he United States to Europe with a Mach number of 1.05 where the air temperatu5t*vi8ic.zkth 1z:m fre is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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