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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 followi( oj,w;1*kdsgk1m iad + zo b;5delgs4ng is a false 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 cq+f: r(lob yt.onducted 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 sound in a stul gjwze.c 92xt s*6:qeel 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 velo )mzb3.o eefy6city of sound? (Assume that all other factors rem3e6ebfz o)my. ain 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 soundj5kbraglaakz7t7 ekrs*)j52f b +0j9 through airz2lgsbjk ka j0ar9ka*tr+j7f5e7) 5b 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 400x,rs7nr kd u8a. ,+hac Hz sound, the wavelength of a 200 Hz sound in air, ha+ axd r,8sk.cun7r 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 20,000m :jsbq7o 6ni-z +isu/ 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 Hz are call gam 1g7.0o*dy/n ln;jr o l;z7bj+dlpnbu*5ded

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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 wave 8rm qa)2r,d mcpb0q2xs uniformly in all directions. If you move to a point twicdqq,p2)xamb 0m c8r2re 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, int8fjn 1syt bf2s p *et57i,ef 4t)atqt.ensity 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 tkyiq5f6xd+.9i ou1l d he source is I. What is the intensity at a distance 2di5odx + y1lkf 96iqd.u 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 soundnr/)oqy 0mr t+ source that is radiating equally in all directions. What)qy/ nmr+tr o0 happens to 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 distance from a sound souvgd3 8t*d9gvt rce that is radiating equally in all directions. What happens to the intensity level of the sv9dgd t8 *gtv3ound? 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 x-u 9 g6efqwd59t6 p;fd *mchaa 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 speakim(l3st( fp* bxd7-m, e/kguber emitting a pure tone. What characteristic of thpb s/um,(g ibl t(-kxfd7 e3*me sound 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 musica( r5:yo8bxhvn (is- ayl 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" v/vmzpv2))ga 8 :wicq 8gil/5byk.nuof 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 waterivghg;3k6 -*y5tc pwtj.f q/q

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement w f,5/lw +:t1 5)gemt yfp tq2s-uifppjaves 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 swbjjrnwe:d b.,i1 b,(;r::ap;ke1 o zdrzp z .ound wave generated by the guitar as a result of this vibration. Whatrd1z,:bkena;b 1,:zr(wd: e .oi bwjrj.; zpp 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 eava9i bzq22oye y 4e/)l.ncw 7nds, 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 ofx)3,ayzt f-kr length L. What are the wavelengths of the three lowest tones produce,y 3 raxftzk-)d 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 an open pipe of length L is 200 Hz. kb7 qd6pi 6fyaa,ho8,/ xi*rp Which one of the foll,p8 daiq,kay6rx*hbipo7 6f /owing 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;omp x+*kx* vtn,vi 5zsd/syjxg(n +6 fundamental frequency. Which statement is*p; s6xv+ myskjd (gxi5* xvoz/+n n,t 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 cya *.)f8ldh/nh-vj fnlosed 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. Wha3/o( wzhxof*ctf7ja ) t are the wavelengths of the three lowest tones produced by this pif3zo(c oh w/fxj7* t)ape?

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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 piri o/fw).y j*gijww4 3pe of length L is 200 Hz. Which of the following frequencies will n.f3wo wgjr4j y/ii w)*ot 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 i60sfi6kfuw+o hs1- aj ts fundamental frequency. Which statement is cajof06- sfh6w +i 1skuorrect?

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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 s+tu(6x j5tfb uource. Each speaker produces a tone with a frequency +(tjf56ubxt uof 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, tanlnp.* t/ i6hkxp(h/ he 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 togf.zqc5) v3ipnft /qv(z lp((eether and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increasedlq. v((qz pi(/t 53nzfcepvf )?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explaijk4vol 7cex neo-xi jgg nl4417,u5, fns

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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. The frequency heardk-x5 +hz8 iteiyx4c; mzn8 ux k3g(ot: by the obs5mg tytznk8e 3ixu(xz- 8;xk h+c:i4oerver 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 heard b+g(/dxg h v3tay the observer3xt/hgd+(v ag 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 tovtfwa(* p nri)4 k67dq double its MACH-speed, its half-angle will decrease by a factoqp7d(*k)4fv r 6iwan tr 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 ultrasoni5,tr-ko zut5y7ij b 1rc sound of frequency 45 kHz in air is 352 m/s. What is the air temperatut-kir yur5 57tbz1jo,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 s(l(xvw+ tatmk8/ mj,n 1i9p xcound 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 spe8xh gw:io6d mt3i /ct;ed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. Hhm 6i;tci: dtw8/3og xow 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, and hear the echo in 4.00mqu z1xneg7;(m9h: mq)rm6v7lc c,s r 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 distance to(rk 1ett.l3 pl the ligh31.rl tlept( ktning 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 + mo fieq8u-8w gny(*ka cliff 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 hear the splash 2.5 s gxs5can5tnf3 w5rg42 later. How deep is the well?s3frw2gcg54 5nx 5tan (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 ok2rqfb 1o 4u,lb2lb.tf a sound 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 at y2v cg x1h/e(1g*ueznj9x m6 l$23 \; ^{\circ}C$ 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 with m8k )xr 2+s+e8 /bypykqlxgnxd( w(k (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 xt6.t-9m euhkv/ e 1wx70-dB sound?

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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 ofl ,o xkja);x-s 57docf two sounds with intensity levels of 70 dB and 4xcsfax-l oo5 ,k )7j;d0 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 intenso9e/ 3 v fcl*5 xfkzkm)w7)h)of71 eyn7noxbsity leve)x7k9o l koxbfo zy) /enf3nc75*7v)sw1mh e fl 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 ofhh9 vm,)s8us y 6.0 m from a source that is radiating equally in all directions ishmy8,u9)h ssv
$6.0 \times 10^{-10} \; W/m^{2}$. 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 thatm:n uy.n9h: id is radiating equally in .ihnmd9y: :nuall 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, o x.pefr9/k l /2 wwkrv8d7af9which is assumed to be uniformly distributed in all directions. What is99fo8pvfwdwe k/ r a.r2xkl7/ 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 qb/ /km um6xsb2ks/fw;9yx b4m from a barking dog. What would be the intensmsf/9k qyk ;xbbbw ms//u24 x6ity 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 mg- q:9t)r m.gq gmgjk, 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,m 9qtj).:gkgq- gmgr 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 score*.,+ n3w+0m*teuky pmmz ource is 95 dB. At what distance will it be 75 dBkzy u+n*,r .mop+ eem0*cmwt 3?

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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 Hz. What +pteu 0iu1efv5x51msis the frequency of the fourth1ev0 5s+tfe 1xu imu5p 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 tn3 zkbw+ b23lbhird harmonic of an open pipe is 900 Hz. What is the length of thbnzb lw +32kb3e 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 0 0f;2k8p5t;f hg sdokzpx4ltis the frequency of the lowest tone that will resonate in apt0;sf t2z4d ;8f5okhxpk l 0gn 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 7gf jpv067, lbnmobam8 ,rn r8m. If the velocity of sound in air is 340 m/s, what is the frequency of the second 87j mnovgrb ,pnb7ma,r6 0f8lharmonic?

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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 tem*laswk+b*3j sperature 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 fac:j:xaa n9 dv.yjn/c2 g56jHz. What is the frequency of the third harmonic?x :jvy j2c.f 9agc/da65jnna:

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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.biwa14 h. ctx pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when thxwh.cabt1 i 4.e 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 xkbt2u*qbl 61b c4, qproom 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 il/ue ctgd 3*a cz9urpy,/v5g2n 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+f jl6+wtz8x g length 0.75 m is played when the speed of sound in air is 340 m/s. What jglwx6+zf+ 8t 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 og+ .or8 wsomnw8m1hz8 pen and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental freqog 18nhm sz+o88.rmww uency 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)dz8hz b p 7-08dspfsj00 Hz in air where the velocity of sound is 340 m/s. 7z p s-)z d88psh0fjdbHow 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 placed side by side and driven by the same frequency of 500 Hz.i)p dbk *dne3) If the distance from a person to one speaker is 5.00 m and the person detects little or no so nd)b*d ekip)3und, 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 4cdebbu6+i ) g /mpr6f*44 Hz. What 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 musica1(s8 -pzhuscnn0b sh5 n/b8 dul instrument. If th bpdns5s10bcn8hnuh(u8 /-s ze 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 sounds produced by tizp: /g01c rqfjwp dl/6lav ,.wo horns are 6 m and 7 m respectively. What beat frequency igqd, fpjz/lr cwi. :1/lpv06a s 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 vi,o)o vwll*.otolins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is playeoolv o*t.) l,wd. 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 sta5nd)+a+e- iqym+t dtci 2 npf.tionary 1000-Hz sound source at twice the speed of sound. The observer hears a frequency o)ic5tt2ea +-mfp dnd. yniq++ f

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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 frequencynou te) . d8q- zqtq0a0k9r:fv of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The okufrte)0t9o n0 qv adq:z8.q -bserver 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 wisak(u.e h4*jqth a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 mu.j 4he*(q sak/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 (+lysyov z +wn v;f/0ctraveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The cz+vn 0 ;lc+wvo(syfy/ar approaches and passes an observer 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 ob8 yrae-e zu 8ml*3jia+4w:enaserver when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound nza e mr8yl:aej4e*a u- 3iw+8is 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 towardkp6m- 2bt 8 vwocjo7dj ksqfc-;1x(x6 you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hcpsjv-8tx-xokb6 kmqwo( 1jd 6;2c 7fear?

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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 ds 52s) zr+tus)yvrm;. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frmd s uz+tyrsv;s2)r5)equency 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 yo ktb,kn a .j(a6 p91qe5a 7+kzezl*brru at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenz +l* ar6b.q1ra(tp9 j ee7kb kzan,k5cy 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 whif7qism q73 ke-b+g t2istle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of thei mqkbq7et3g 7is2+f- 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 is5i ;vb2wn:sf1 (zar yf 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 moving away from the trbfa (:f; 521rviy zswnain 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 ky1n0 x4x(mr -sn*e)9 w i/+ibd mfgrvspeed 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 )9(ig0vm xb *i er xd+rnm-kf4/ysnw1 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 objectbi.4*w ic; 8g2qjv ljb. A 40-kHz signal is sent out, and a 42-kHz sc.iv8j4 q;bb2j* gliwignal is returned. 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 shock wave produced by a supersonic ai oa ;d )c+zs9w4sj+pi7hw-oama q 4w)arcraft 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 conicalirw) t+uicy2gf p2x ,cny 9z)(q5 ed+y shock wave + gticecz ,yi(x2ny)2)5r p9u wydf q+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 t.in mc-n2 buj9he United States to Europe with a Mach number of 1.05 where the air temperatu2jbn in -.muc9re is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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