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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 fa2 j: iyk8/tdralse 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 faste -z wst:vg,)z/ ttd9hqst 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 sounz( tzw4h. idfb)wlg8(d 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 happens to jbe(+ vwew d9gv66i a,ij /si7the velocity of sound? 6 ew/vjie6b, +7iiavs(w9gj d (Assume that all 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 Hzh3pf 2js-hb6 p wzn3t5 sound, the velocity of a 200 Hz sound through 3nh2- 3fzt5h pspwjb6 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 wavelength of a 200 Hz sot+ud:e wako9j +.xbp6 bx)/ufund in aufjx op6a) tbku+:ebxw .d+/9ir 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 ty u 1dsn 8gni.pi;b+t8han 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 frr7 (t 7w n-eoqdp9fmx5y kz6-pequency 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 emitting waves uniformly in all directioh0sp9zq 8jfg3a9 cf4 ans. If you move to a point twice as far away from the 0h 4caf93sp9fjgzqa 8 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 i nyzrx.7yge9)98rfa)hz n(eh s 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.)ag p jr q9+fv++ff,gv What is the intensity at a distance 2gq++ pvfrfav,+f)j9 g d 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 1l:qj5/no* g;s vkagrfrom a sound source that is radiating equally in all directions. What happens to the intensity of tgqrgj :kl;*s 1 o5a/nvhe 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 h. f/n4 2cwyu5vj /pft-zjp+nthat is radiating equally in all directions. What happens to the intensity level of n-hpzn4up+ c .vywf/j2 5/ftj 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 becomes louder?v43-)6xr gnn c0zptd,w .kqxgcqgr0 -

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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 e3tkvey. .4f 4pp.ds hcharacteristic of the sound 4s.tefevk. 4.hydpp 3 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 musical notem1nne 6k g ft23qz9hkx v-y,xd()2ahi?

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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" ogo-, zfdhbs 0)f 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 wpi )fwxn-fscr6-;i1e0t izy 8ater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaceib t88e,4zyj g 1mju2fment 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 gen4-/5arwwhx x yerated by the guitar as a r y/x54rhwx-waesult of this vibration. 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 openv6n3wvtnvtwebqw 71r* x;9 q/ 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 lvzk4yg5:xl3-cu jmtr3j8ws, owest tones producemgc,t8x3 3r -4jku5ywlv zs:jd 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 r r1jfabv. w -/:hqzy;eesonate in an open pipe of length L is 200 Hz. Which one of the following frequenciyq- .zavew hbf:1/ ;rjes 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 fundament qe;)fxi;oat9l 5 2kxyal frequency. Which statement is 5;;lokti9)f xaqxey2correct?

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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 thed5f*cxmnn/+(ztze p/ 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 cr5x8hcrk,o4 three lowest tones produced by this 84xr chkrco,5 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 closedefm+ 3)fzxoeg*f bs7 + pipe of length L is 200 Hz. Which of the following frequencies will not resonaf+z3)7e msf+g exof*b te 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 clc w1/z k3dv/ypf;v:fmosed at one end is resonating at its fundamental frequency. Which statement is correctf;z:cywp k d3mvv/f /1?

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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 s 7 jg7:maead0xd)m9vmn , ftg,z kf3a0peaker produces a tone witvdmnt0mjefga0 m ,x 7z39df k,)7a a:gh a frequency 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, the two sound wao dd0.acdh( jl*z9zb fky4-+xves 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 avv. uw gx,wa7. particular beat frequency is heard. Wav7wwg x.,u.v hat happens 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 expla -7df5po0b zk/ nqv:m2sikn1b ins

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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. Thkko mt (*21-tytenu0we frequency heard by the obst1 ktmowt02(uk- *yen erver 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 obspjy1 go;lok /n5jwp*,erver. The frequency heard by the observer jnpy15o,p*lj k/;wgois

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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 swug frq6b)by8 xq2 (9a fa8b bu)fsy6( 2xrg9w qqctor 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 frequensqm ir 7wmp0-ak s3.v,cy 45 kHz in air is 352 m/s. What is the ai03 mw7 smrskpai,-.vq r 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 spee24 xsvbl0q 6 fodmbe8/4 lfcn2iz,u y.d 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 spesc90zex( mn k.ed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was thkmn9ezsx c0.( e 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, an ) 6xmik6e woteya-w8: m0a+cyem f9e5d 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 of lightniqy/phx +n. x:ion ka*+ng, the distance to the lightning str.yn+:kxa/q hni*ox+ pike 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 temperaturex5(n,o mi,olgdow -j5 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. How deeba2s ak9(i: bop is the 2i bs:obak( 9awell? (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 fzv,4 .hj*smv ;kzzryb0k8 5f6+zlos 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 av(puk 2 (bzo,cr3pmv6-mvkp9 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 sounduxyezh: n5qmp:5gqfbfl2 ;m0wxmtl ,0x-. 1o 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 j(7 )gehm62h)q llqqdsound?

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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 twoj l6by0c88j h uzx/t-fl2g0yc sounds with intensity levels of 70 dB and 40 dc/82lu z-fx00y c6j jg hl8ybtB?

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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 iutzrp* +d *g)yspnb6 .s the intensity level generated by *t.bns6 pu+p d*zy)rg 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 equtsekc6c (:cd;g -3h3o5ul6r c5y5 hq(frqzf zally in rozfhrh 3-5qf3cs q;c 56c6gkl eztuc( :y d(5all 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 6t+v xzk179q h,yfeol *.0 m from a source that is radiating equally in a97+*z xqyh vekotfl1, ll 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, which is assumed to be unif q) ( t::7vs;lvfjilnvormly distributed in all directions. What is the intensity level at a distance 5.00 m from thv;q7v f:(vsltlji n) :e 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 barkin;mt.ke6i mlov.x w/xw0:/yuv x6 kwq)g dog. What would be the w v kyio ;.lk.weqtx)x/66 mw/:x0vmuintensity 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 jj d -nsm88)qzm 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 source? Assume that the source radiates equally in all 8-j)8qjsmdzn 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. aw 9+t v1er2ht At what distance will it ethr vw 29a1t+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 c/s 7b5y x:uin,a+xrd3vao p9yomplex tone has a frequency of 1200 Hz. What is the fru7ayxo:p/ns, ryb 9vxd +3a i5equency of the 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 openfk6v4) dgchl/ pipe is 900 Hz. What is the lengt kd/6f4)glcvh 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 resonate in an open pipe of length L is 400 Hz. What isx:m+l6y)w8x bzf: p bv the frequency of the lowest tone that will resoxvwbz mxl86bp) :y :+fnate 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 rcp m*yk6w; h7m. If the velocity of sound in air is 340 m/s, what is the frequency of tk py 7c;r*mwh6he 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 temperature .(ekj2jkyqh ex 4r6y h)z6f t6is $20 \; ^{\circ}C$. 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. What is the fr v p)ieoz,cs17equency s i)op,zc1 e7vof 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 o k4 ouvi3c.vx5f the shortest pipe closed on one end that will have a fundamentav5uv.ck xi34ol 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 the temperatuy - 7d:fn1hlzfl(235y laziffre 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 ; 0)f:;.wu7.yp nsb2k dc 5uv vueyawftemperature 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 soundz6vrg*,:,, ep xjvui0 rt /uer in air is 340 m/s. Wha,0 ez jiu r6:r,uv*t,p/gxvert 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 open and the othea7l: njm*ucyg:-su6 /mkp d 9yr is closed on one end. If the fundamental frequency of the opmm9usgc:a*-ny yluk6d: 7/jp en 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 emie 6)dsmvka;mh;h q91p(e if2zt a frequency of 800 Hz in air where the velocity o;hv9(2efp1 zsid6m km;e)aq hf 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 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 place r* zgtpaz9 mxyiu*h*:86-zaa d side by side and driven by 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 posa gzy69-*8mi rtaz*:hzp * xausible 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 beat frequencu/adqim.9as9cm- jc * y?

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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 5500f7odlg2: npn7qsf k 8-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency7lp o0nqd :kf7fs ng28 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 ht.0 sj( kuyp*u*9wv ceorns are 6 m and 7 m respectively. What beat fre.u (0y wp**sutkc9vjequency 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 aregj ;k-d6m+rqn(fo( :/ rv1c; gxktmvj found to prodqfkc:+ drngv; mov6xtg( (r- /;1mj jkuce 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 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 stat2 ch/suqt0dagy f:gw;r4;j)mugh,5 aionary 1000-Hz sound source at twice the speed of sound. The observer hears a freqq ,g mrg:t;jwuf;dhy5aa2c0gs u) 4/huency 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 freqq l c(cu+xqb4h25k(x luency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. Thl5(cxu +b2xk q(lh4 cqe 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. Iace/5b h5y5yb1kqbwr) .t+ dxf 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 y b5dhtxa5e c+ky1 b)b./5rqw 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 when tpt+v9qsadbvc- ; wjwe4d9* i-s si.m0nkz v4 5he speed of sound through air is 340 m/s. The car approaches and passes an on . wkc+pea d9;si5*q-0i9-dbzt sj4vmswv4 vbserver 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 trazvd,waa:q 41 hin approaches with a spwq:,d 1aa hzv4eed 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. The train zzx4d+*co9x zblows its 400-Hz whistle. Take the sped9+xo z4zxcz*ed 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 stationary train. The train blows iv i9k6qonl94q ts 400-Hz whistle. Take the speed k6vnql o49iq 9of 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/xmb(;a22 z ymu;u: gpq z-w3gmh. The train blows its 400-Hz whistle. Take the speed of soun;qx z(2b u3am- g ugwmy:mpz;2d 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 asy0e ;nyx:o pf.exg.5way from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the s5.g . n;yfe yp0soxxe:peed 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 soevu ugdn: oe;dqi+3 pqo1561 3bs(jylund in air is 340 m/s. Whabqlg1(ju 53p i;oe +ou vyn6e1:s3 qddt is the frequency heard 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 is 500 Hz. Assume the spen jl0k:b*apg j77 7r3 fx8/mhnq5juxr8c:fyaed of sound in air is 340 m/s. What is the frequency heard by an observer if the87 bc:a y0j 3 fh/kapg ml7r*8j5qfxnxr7jn :u 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 ap/mmgl:j ip kpr)u5 yx .o-9s7n object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound gsor9uk :y -jmipplx)/p5m.7 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 shockwm (3lreaewxior 68:ihea 6)2 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 Machj2 s +b,s,uvxy 1.4. What is the half-angle of the conical shock ssby ,,2 j+xvuwave 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 fliej1c3lf+tl f,es from the United States to Europe with a Mach number of 1.05 where the ai1fe3+lc , tjflr temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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