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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://tiku.one/test70.html
 作者: admin  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  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 statembdg( +q8olf/l ent?

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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 thr+0xbqdgi pd, q9v(u c;ough

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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 steeli8f eqzg( l+txpah-mi *:zz2w wwd 08. 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 the velocity of sal:9k e 8x( iwn focupl;j9 qbi20-3gbound? (Assume that all opq i 2a3( b9;x fubwegli:08c-9kljnother 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 velocity of a 200 Hz sound thr-f c() ure6tarv2t-mbougmv- ctfa2 bu(6r )-treh 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 sound nc,*i5lylq /e td5/b rin air t ,/55qbirnld c*ely/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 20,000k cc7t-;w*lbw tdkr/5 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 eyywm,4- zrlxjp t7e 27ktl99 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 a28hw8q -*ye 4zrx nuqrll directions. If you z * wuxnh2q-ye4rrq88move to 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 wasbg30, *rn7 ru4iztnm ves, 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 t ;uhs54a7xciohe intensity at a distance o5ui4 ; cs7ahx2d 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 radiatiaa;4 hviar/ w8ng equally in all directions. What happens to the intensity of the sound? It reiha r/a8w;a4vduces 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 rad9dencepj k++gsx d / v(,6a0phiating equally in all directions. What happens to thd 6vn9pg/+ac djee s 0,+xkp(he 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 bs h* fyj0u6px5ecomes 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 toward8i/ejn u)f m(c:mzr-92xoq um3ykyh) a speaker emitting a pure tone. What characteristic of the sound increases?m9m8)iy e 3nm- hxqu/zu(fj ko):y2rc

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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 musicali+h:(mxj yjotr7(5hc un7 1uk 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 mcnj7 xvxs(p )djhn2; yve+6w3usical 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 e6.c n sz6k-xvyoohf v:s9:b l1kq4 (cwater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacema+ip;e met 8:g30lyp rent 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 gen ble*j(zy7w-sw7c)g verated by the guitar as a result of this vibration. Wh(z7y w -*bv)cs7ewjglat 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 open at both ends, the 6dlmfgd44k-kwl i7 je,,bz1hre

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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 r4-+qnsfcu lz;0r1ak the wavelengths of the three lowest tones produced by this pifl; ca10q +u- zr4krsnpe?

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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 pipe6setplha m04 og 3c va/-r8*il of length L is 200 Hz. Which one of the following frequencies will not resonate in the same pipvgl3mrstah-c0 ao*4 l 8/e6pie?

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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 atouxdj)6, ec6mj 0or-e its fundamental frequency. Which statement is co6 ejxmcj or,0-6do u)errect?

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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 otheq o5isaxx)qbj n+*:i 1r, 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 l2v( by 3mmes3r d)hf1tength L. What are the wavelengths of the three lowest tones eyf)m t2( 33br shv1mdproduced 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 clotroyy / gti7h3uk 2f7x2wp (h+sed pipe of length L is 200 Hz. Which of the following fr2r +u7y7f/ot2w(ihy kx ph3gtequencies 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 at s n uq3.9;9v5r:dymxj e4s annits fundamental frequency. Which stat94qe3a x v d:rnnjs5snu;9 ym.ement 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 ssg 4r2)pitwckm b5-/npeakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hb2-kiprgs 5) nw tc/m4z 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 waves y jog ( uhja1glgjy:mj8615; wshould 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 a particular beat frequency is hxtge2+ld,jw5g f7o khp.4 y d8eard. What happens to the beat frequency if the frequency +fjkwg th872ged 4y5opxld,. 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 explains mfqa+3yv7a1e

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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 statiofvu5va+67 icfx*d8d.*k5rle2n uy y wnary observer. The frequency heard by the observerywd niaky.5 e5vv* 6f+u*du cl2fx78r 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 frequency heardm/ge:agy/ tub3e9u/ l by the og/ubgt/ eyleaum/ 9 3: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-speed, its half-angle will decrease by p i,:a h + pic7,.rd,drf1pepfa factor oai1rh:rpc p. +d,dep ifp7,f, f:

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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 45mn s5suc *qe97 kHz in air is 352 m/s. What is the air temperatu5nssec7 mq9* 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 of soun 8+uyq/;8.fczfsb lv1r 5yemld 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 sound2xne4w4 93z 8 clgftcc7tvx 6w 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 reflecczwt3t 98e7n 42vwcxc6lfg x4ted 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 heajty)v mv:zu,rj sw623 v19yjd r 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 lightninr- zu*35d cjdog, the distance to the li*dj -uzrocd53 ghtning 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 clw1dp e0rs/p d;iff 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 ekb*nixvpq4 801 06tu(zuqe kdeep well and hear the splash 2.5 s later. How deep is the well? (Ignore a0q(e x61un*ivk bp k u04zeq8tir 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 b/8/ xrmhtklv t +) 6)evrbx)ofrequency 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 aib)i*bj q9 kzqtr*h5c7r 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 intensitcxn0c5wrsib1 ,o*fr;j9:dah2 7q ezry 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 a 70-dB sounvk 3y,gfrwm6 -+du k,ld?

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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 th 4v.vazwtpr/ -o/zrjby88nq5e intensities of two sounds with intensity levels of 70 dp v-58zwntorr//azbjq 4.y v8B 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 eycs2zo p7bv-(: f+j ea garage is 100 dB. What is the intensity +7syeoz2:- f cjpe(bvlevel 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 radiat1*ll-j bav6zo4 rpt ta5 kf26ting equally in all directionfa6jkl5v21 oab- rt4 6t*ptzls 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 fromrj5* h0 chbkb9 a source that is radiating equally in all direbhjh b9*c5 kr0ctions 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 unifo kmh9gp. par -j 7;7 oghkodzbqk,:t0)rmly distributed in ap77brmq)kh;g .kh9g z-j tap:k 0 do,oll directions. What is 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 dtlz,d lu btc3khtj :m;( -u+w7B at a distance 5.00 m from a barking dog. What would be the intensityubu ,t+t-hz l d:wm7;kl 3jtc( 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 sour a )z0hbtr;15lwkcrr: ce 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 directions. :b;wrzr5tlcr0h 1a)k

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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 sour1yqfp2 /t, 9e pjdi;yice is 95 dB. At what distance will it fe2;qd9 ijtp/yi1p ,y 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 frequency of 1200 4e2tl 7 jxjndw gym,to(e,j3*Hz. What is the frequency of the2t gyj ,xmj4l*7ejo etnw3d,( 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 c*dh mbzoa2 hv5sg 13:q-f;aethe leng2hh e f*sg;b-dv3 5: cao1qmazth 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 isp da1/k2jhh p8 the frequency of the lowest tone that will resonat8jh 1ppa 2/kdhe 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 enyv ex3 ov3dh..ds has a length of 0.80 m. If the velocity of sound in air is 340 m/s, wxv v33.ehdo.y hat 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 i -(8tmmdce7k/ ah5 9fuj4zw tas in a room where 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 frequency in a pipe closed at one endxoj-j3:wu r/o is 330 Hz. What is the frequency of thrwj-o /oj:3 xue 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 endysc,z,zz ) f6 b:g+dpx that will have a fundamental fr z)d,,z+:cgbs6yx fpzequency 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 e u,2 x8gb1hdtroom where the 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 a room whe/uk,lrjibb (9 re 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 m is played when *q;sny 11nfs:mu+upl 03ecqpm+c2 sqthe speed of sound in air is 340 m/s. What is the;p cye+qncm*nuq:2squ s1f 1s pml3+0 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 samn) utp 27xd izbc,ql7.e length: 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 fundamentalt2qcxu7 )pdn l.bz7,i 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 ofg:neu:/+ ozigd7+ol*f .noh c 800 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 of th*h+nugnfgzec i.o+7l o :d :/oe 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 sids5or r .6s5wuex e(6pye 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 litt rreeu5o5y.s66p (swxle 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 beat 0nc/nc 3 *whycfrequency?

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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 g9aslb.eu x 7,d9x jup+6mzi6tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequensui,xjlbx 9 a.u6+ g6zem7pd9 cy 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 resp ppjn;g3v/w.k 0ffg:d ectively. What beat frequencyfwf; pv/:pdn jg. g0k3 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 violiufqk1.k a:, t74akxhqns in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentag4hkakt :fk 1xaq,u.q7e 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 sound source at twice the speed7g0 snu:cs,e;ckay9 n of sound guksnas9e:,c7cn y;0. 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 ofkzi ,7p0 be3k-qay6 yl 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a freq,7e3ybq ai-k 0 pylz6kuency 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 with a speed of 37em21xel:lq/aa z 4ve 0 m/s away from the sourcea: axev 2emz1ll/q7e4 , 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 tra s4 7y36iprfd rtefyc7;y*9 r2y:q:djtqt lj 2veling 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 4dqf 7 j 9:dq*r tlrtps2:7 ty6iec;rf j23yyyalong 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 a9a k8jbr0 ;dj:8ywv4e ,wrv :one ,rcby a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the trocwv, ka9b,ynw j40:r 8ee vd: ar8r;jain 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 blows its 400-Hz whi)s 8wi9apbn n4stle. Take the speed of soisp)4anw8 n 9bund 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 kms xx73zcop i:j8ty *q 5rcn2c*/h toward a stationary train. The train blows its 400-Hz whistn* t7cqi pyor3j 5c8xc *2xsz:le. Take 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 alx 5cr 1 ;od) ;vtr)maieu2r7nt 120 km/h. The train blows its 400-Hz whistle. Take ;il ra)vr)t2n 5or; 1ude 7cmxthe 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/+bmwz9g r nx.-h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s..+z-mngw 9bxr 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. yc8+dg-klx7y s) of1hAssume 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 wi1k- hs8lo c7gydx +)fyth 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 hor(8bxm.fqaxsf) b mz-) 2.xbc1rlw;b 1wqd,cy n is 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 f2w(., 8yx mx)wq cqbfc) mba1. 1r-bx z;lbsdtrain 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 determm+ ml.k /kjof* )of8d;( tqaimine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound m mki od)lo;(tm+.f8 /faqjk *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 shock wave prod;x kj0ekn6 9tmuced 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 *ttjpnr6 or 1m , :fd)mw4x3iyof Mach 1.4. What is the half-angle of the conical shock wave fortxyfj wo:4nm3t)i6 d p 1,mr*rmed?

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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 fr+f rcr aan5d on;e:l;u,cpg:b 8/v7mpom the United States to Europe with a Mach number of 1.+pac bcr 78 n/uv:o:pr ;anfgdl ,me;505 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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