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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 mkm,6h g6m-db4qr 8a)2: memm a uhvb;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 cf)0b :(bxqcl conducted 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 +hvmg .p0q j hfa9ge6s+e/q7ysound 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 the velocitsq p,o a28vg;s6 r6yjby of sound? (Assume that all other factors remain consta;b2 rasop y 8jvq,66sgnt.)

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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 throqf/8;ckyaxnn e( 6*emugfe a8 *eqk(6;nyn/ xmch 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 soundruu/hl5s9; lz in air isuz9h l ul/r5;s

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with 1mlj1ef0tk 9u frequencies 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 fre.a bug0:fp+-wb n nay2quency 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 emittj4e uy0 h(oui0.5jetf ing waves uniformly in all directions. If you move to a pointujeo(ueti0j f 4hy.5 0 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 e518 l uwtv/ v/vzp-r h-.p 7jfsnnu7swaves, 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.1tbe nf /l)bl. What is the intensity at a distan)nl/f .1etl bbce 2d 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 radiating equally ifk5zx yq(pmv1 .5yu7 rn all dirf1xr(ypy 5 k u5mvq7.zections. What 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 p 5-dw0v1lzs v7(uf*+tc p2 mrrxd ca+from a sound source that is radiating equally in all directions. Whatud zcl2t+ r5( 0cam v-7psdx1fp+rwv * 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 becomes loym6 5*bv lrp.hv)iss2lwvx fk :(3o )ouder?

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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 t:k jor7c4a/njone. What characteristic of the sound i:o jj7n4kar /cncreases?

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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 musi wdsxo0njd 1;jmkj18ls7kz3/cal 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 musica;;d69 kivzrhf pt1f ;7 pigo/fl 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 intfbiqnf.j ( 3nu:xfw6 :o 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 waves p v ajx8tp+ ub+plc3ye:h1t:7are

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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 2ray(n0 -.wkdd*ttu kgenerated by the guitar as a result of this vibration. What do these two waves have in cou2td rdk*.0yntw ak-(mmon?

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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 endlz1wzh9,pu xp2 wq n7-vza *5ns, 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 wave;cnt av il62r0lengths of the three lowest tone0alv62tc n i;rs produced 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 rdrsd+o:o-u ds2 ,)i3aocdt-is 200 Hz. Which one of the following frequencies will notrsao o-o+c: d ,-ud23ird )tsd 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 ay+bln.fq)ab /t its fundamental frequency. Which statement il+b)y. f/aqnb s 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 closed at the other, ther3xd d-s (7grtde

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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 txsgr lh t4;j21he three lowest tones produced by;1 2txsh4glrj 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 length L is 20 9c h-gx.1uite(b5zh f0 Hz. Which of the following frequencies will not resonate in that pxi.ht5f(zb-9hegu c1 ipe?

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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 resonatgk-0c5r.y.y dcwz w,v ing at its fundamental frequency. Which statementywr .cgz.cy,w vk -d05 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 speake(ac0lpz7e3mrshm3 v- rs driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed 7maps0l3-ch(re m vz3 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 beatsn14n+.zzgtwx , 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 and a particular beat fre,p kv kcu/k,g:y8psdf, ogbygfq4z ;2 gy;y.4quency is heard. What happens to the beat ggpyz oy2uv:cb/k yf4g4 kq.;,ky8s ,d;fpg, 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 ex uzsag7sz )( ux)k.x,xplains

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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 x:w mb9bnmr2e*jk5:r heard by the obser x*je:b rmr9mk2wn:b 5ver 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 observe6).peqw4p z yxep7b saf3c)n8 r. The frequency heard by the observer isea7x3q) bwyp)epp.fs4 z8c6n

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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 decr1iy7as s /dx2 2cxhbe;oq5e c,x9 zj8qease by a factor 2ozcxixs95 , jaqx8s1c7ye/hbe 2d; q 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 kHz in air ik+3ey. /t hadx)fk;sv.zv7n fs 352 m/s. What is the air temperat 3z+7efhd..n)/a;k xvfkvsty 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 sound in air at 67 clt*6kmn1)a r7fm penst; j$0 \; ^{\circ}C$ 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 isx4p/ 0 dh gvux vu2c4lx +7geq*iy36bd 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far p4q b*+ 3x4v 70x6uddegugchvlx i/2yaway 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 tpqtn)0d8-cay f jj(v )he 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 lightnini)o +s. b6lfyag, the distance to the light +i6o.)yal sbfning 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 clifqrdpla( v:g+j.e. ozbrv*m 9* f 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 latw96pj , - t ubhuk )o(46p*ies7vvs b;y+ibtgrer. How deep is the well? (Ignore air resist ejgsr9pwp6)yu-+ ,svktb6b4 7;it* hoiuvb(ance, 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 2+y6omf - r rye(mi3s/.dzax nwave 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 anayc;+8;ccy lir 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 souno6 a :*0x6m6 yipx hlt7pl*rjkatn65od 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 sou7 qi/ 5:l3r o-g wfmt-vib,5 mfht9neknd?

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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 sount.nd-kw uo2r6 y+ emr wo:ig0of e7m l1;sdn30ds with intensity levels of 70 dB and ryk0gru1td o:nio +;lw 3 m efo0e.-n6sdm 2w740 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 thxx6x fcde8+l; e intensity level generatdf8e6+l xx ;xced 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 dist(hpfpta)c nm(vg0 v:9)q3mqk ; pz sq4ance of 6.0 m from a source that is radiating equally in al(asph;v0nz ))kcv3q m:9q pf(pq4 mtgl 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 7z9ru9 4p,mswqo0qdpt951 e m zk5tk;o nmi)y6.0 m from a source that is radiating equally in all s yr ) muk05p, ;q9z49twiop7eknm19zqod5m t 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, whuna7 is gm,0.k:w* wsrich is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m fr r*n 7 mw,uiwask.sg:0om 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 aib:, oe.yxf m4 distance 5.00 m from a barking dog. What would be the inty.:i 4 bfmx,eoensity 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 source the intensity iiad tc(.046vbtdl- ,wgq4 cu level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source w6i0qa(gdtctbc,u vd4. 4i-l? 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 level 5.0 m from a 76idyc 8 tzvq/*aif*upoint source is 95 dB. At what distance willuzcqyf8 id 6i* t*/av7 it 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 freg. yz-e 4ja1up:,wm kvquency of 1200 Hz. What is the frequency of the fourth harmonip:za .kuv4-1jgwyme ,c?

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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 harmfg/ n,4ym85mfsk dan0 g;:h rjonic of an open pipe is 900 Hz. What is the length ofskdrfm;hg4y0/:n8 m5a jng f, 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 400hcohipr; /0s1 Hz. What is the frequency of the lowest tone that will resonate in an o0/hc h1r;ips 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 ha+ 2 kjnp;2sdocs a length of 0.80 m. If the velocity of sound in air is 3p dj2k2s;o nc+40 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 wher7obj5g6 jg0yye 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 w 2wg eiqfh6n )*mn61oin a pipe closed at one end is 330 Hz. What is the frequency of th1w2hinmqnf wge 6 *)o6e 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 end that w/acd; my 6 pe+q5n3yrkill have a fundamental frequency of 60 Hz on a day when the velocity of sound is c 5d6pe+n ;qmr /yay3k340 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 temperaturfir 81f.z qp;+bda s4oe 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 t*j, n yn0ym9zkhe 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 the speed of sound in air c tk- 2hupa.- *xe9qskis 340 m/s. Wq.a9uskxc ke *t2--h phat 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: 6kkv1;8*o8vlpp/nwa-5gr s ps.k jybone is open and the other is closed on one end. If the fundamental frequency of the openrwp5p 8a* kbkg sj;.vo8-lk1p6sv/ ny 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 803zm+a xf. p8gb0 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 the sources woulxp8g+f a z3m.bd 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 eny dvzcsh; +51mrb3kdw3m,7 Hz. If the distance from a person to one speaker is 5.00 m and the person d;y+5s 3w13dcmbnhd z km r,7evetects little 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 zb9s*o2i tii- 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 7v5srbqd aq zsf398 . bzq61kza musical instrument. If the tuner hears a beat frequency of 2 Hz,zs5d9rs.a q8zb qfbq6 317vzk 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 xnmh2fe:k z4)are 6 m and 7 m respectively. What beat frequency is h)mfnz4xe k:2h eard 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 o+l x) w0rlb.1)d p*xxjtl:kpstrings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of0xplrwl)p lxt.k :d *xo1b)j + 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 approachesy8wxxy -z f2o rjf/c3: a stationary 1000-Hz sound source at twice the speed of sound. The observer hears a freqy- f2wy x8fc3z o:j/xruency 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 stateulw(0buyeq cb( e0xq 179:a jionary observer at one-half the speed of sound(b0(le7uaqc:ew 1u xq jybe 90. 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 frequency dpkw 189wqx2n trs,:m of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency kw 8t91wnr:, m2psq dxheard 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/s o(s 792v2i :o pxsuklpon a day when the speed of sound through air is 340 lp2:(xsso 9kpuv27 io m/s. The car 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 observer when a traijem dg7rr; r(:sor 5 kv8 p)2ntqsa+0w9zn4cgn approaches with a speed of 30 m/s. The frequz w8r9nq;5vs:dj(grk7c nma0+4or rgs tp2)e ency 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 blows its 400-Hz whist:j-2g3gany s az+oi77 wger:mle. Take the speed of sound to be 340 m/s. What3n s 7z+iao :emgjw -y7a2rg:g 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 towa 7h.hdhcsh0/ mrd a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 mhc7 0d. hhmsh//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 train blows it n;-gc q4ivz+af8l*mg ps59jxs 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you heacf-+jv*gm;xg9i a4l58 nqpszr?

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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 iyryl yjs: r*arc0qk,4r+9w; cts whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actu0c4jr:c,a 9l;+ryyqs*rk yrw al 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 sjqiz5++ wo6dgsk1k8oapx7 3ci43s my ound in air is 340 m/s. What is the frezxdwis++53poyi4 a7m 3 1g oskc8jk6qquency 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 speed of sound in air c2nt3;dlq q431 jm4 2f xt/s3gpnhcen is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with32hx/s tcn el1 4gcq4j23qmdt n3n;pf 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)6gdb. 7xvioh an object. A 40-kHz signal is sent out, and a 42-kHz sign) g.b 7od6hvixal 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 aifq b lv2q(ll-fvpl2( +t+tdu;rcraft 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.)ex8 p-5aotlu 4. What is the half-angle of the conical shock wave formeue)xl85p-a t od?

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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 States to Euro18 wc)lded 4pb:v 9vqu t3jj,bpe with a Mach number of 1.05 where the air temperatebvb)t9,qvdjjupd 8wl3: 14cure is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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