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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+bhz+ p cn*n-, gn8catv+oypmw x)x,* 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 (in 2sh ki 22d5ykxte;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 sq5fx qwy3wzyizov *)-:ubh+ l- a+.vt ound 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 pzp+uzh6mcg-bhrdud:ad9 0 +b9 0) h jincreases, what happens to the velocity of sound? (Assume that all other factors remaid9zg6hu z hmh-+r)b:adjp uc0 9d+bp0n 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 o8t/wavr)(wq2:g qt8 co jwz2zyi x75df a 400 Hz sound, the velocity of a 200 Hz sound through air isw8( owyc:vt2 5 ai2zzqgd/7qjr) w xt8

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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 200w-efi,n :h:3y511 m moknpuhk Hz sound in :3 n1 ,5koum1 h -fn:ewpmyhkiair 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 hr33fsw;dp, gfrequencies 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 frequency less thaczb)x;v u q*)7w-igz fn 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 il7-5/-yyj fw sv5 xn lzq goav.,5l3yus emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound as5jy xzyg/oy3l -,fv5 -.7v5q lluwn 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 diver.6u a lba,i: e+w1k c)i.narjfi3s1zkging waves, 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. Wyp9h-inv ( ee;hat is the intensity at a distance 2d from the sourvenpyh-e ;(9i ce?

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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 z upz,rqlo-fu (olfb r7(r0n c6y 3+1vequally in all directions. What happens to the intensity of th u(,y(z7n-or 6b3crl flfv1p0qzo+ ure 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 from5 x ls1kc9eu-x a sound source that is radiating equally in all directions. What happens txc uslk 5-x1e9o 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 increaseuww 5rv(i*09/ouo xqt s as a 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 speaker emitting a pur5 *ql)pp;he fme tone. What characteristic of the*mfl; p)p 5hqe 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 lo b0 6nhyf6/..p yuaka musical 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 musical note?5uegjvm- q +aln5f/ t.

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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 watdm 92rxv)prqru mun/ 3a)1l u.er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wao ,e:rr ) nm7s-uhqcc5ves 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 .(uguiks*y 8k guitar string and the sound wave generated by the guitar as a result of this vibration. What do these u8u.ky g*ski(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 wh d9q98wseya3fuoeu2o1n:udwyf0s q ,1b -l a )ich is open 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 lowestb mkq6i (rg)y j,;t0da j;bq a,(6 )tgrmiy 0dktones 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 L3w*l u: ,o m61aorntpvewyz-9 is 200 Hz. Which one of the followir t 6:* w3,lyz w1aeu9opn-ovmng 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 it/6( lj-b)wq9o a9 ayud:g pbyms fundamental frequency. Which statement is cor: auwpm )a99job-( yyg bq/ld6rect?

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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 is7 cv 6tp+9nm6d 2ed01kvojcs g 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. Whr,nswdd 6 bw-a8sg+z,zy: +d, uk rrz,at are the wavelengths of the three lowest gazkdys,rrd:+wr,zw6z u8ns ,-d+ b, tones produced 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 closed pipe of length L is 200 Hz 6)q2xivtc)d x. Which of the following frequenc 2qc)x6)idxv ties 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 clzb /azcid;x 2,hot,/v *9hb xxosed at one end is resonating at its fundamental frequency. Which statem9xbz x2 z/ vi*hctdxoba /,,h;ent 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 s8z/ bk)cro1k lpeakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hzlr 1bc8/kok )z 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 bz-- cbz wtwhqyi6*)*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 bea;3o /cnxlr qw*ogn +0at frequency is heard. What happens to the beatc+r /ow ox*nl30qn;ga 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 exp18-*nj7v(tncr hmo l8ucflk: lains

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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. Thef mg6meoof9m+so1rh+*vu3 4o frequency heard by the obserf1*gfv9oh4o+roue+6s o mmm3ver 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 deparbzgvjw4 q.*ohrl5x4eg2w ;5 n ts from a stationary observer. The frequency heard by the obser n 4zg.hgw 52 rw;be5joqlv4*xver 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 dedwrd se4 2rzh, 03g08 hagzj,c0i1z its MACH-speed, its half-angle will decrease by a factor of:gi , az00dd2c,e dg4h 1hsw8ez j3r0rz

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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 ultra4ru/0c7iyr ,;l comzc. t zu;tsonic sound of frequency 45 kHz in air is 352 m/s. What is the air temperatuzu li0oc/, tr;ct zmy7c4.;rure?

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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 umbu c0-pe-8a;ab(h f(vqff 1sound 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 speecphxnf4 b6x,7fd.imd t09qp,4y *qo hd of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s latehxdcq.ny740,o h 4m 9f6iq, pfpx*tb dr. 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, and hear the echo in 4.00 s. The templdenr4 dbu.7 (erature 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 fl/5bdfn uk n(/hash of lightning, the distance to the lightning s/(nb5/n hkfdu trike 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 temperature ir3v;kux8qa8 4uupniy g/g h8 +e;1l rus $15 \; ^{\circ}C$. 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 2.5u3gr - 0zij*g za71eif s later. How deep is the well? (Ignore air resistance, and a0jz7fe*-u3z ii1a g grssume 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 of4d:wv2pz6wtma3r nx,ma j e1) 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 szvkzt.8 +9x3j3txzv$23 \; ^{\circ}C$ 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 at k3u 2vqnnu1.5-r ani 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-dtn tx1o2u a*6nB 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 of two sounds with w 6qif ifrq2.f5vm p3s8ahl.,intensity levels of 70 dB an.85fw qsmv2 q6f3.lif ip, ahrd 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.e:/s:m5 n .72yeln)zk p mnakym6aep in a garage is 100 dB. What is the intensity level generated l.7 s mynp.2pe6ya)ee/mn:z nm kka5: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 radiating equallyuttv mewxw +p*pf19,2 in all dir 29p vmwf1tue px*t,+wections 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.vdy9*h4z7o. z qzxhx o+e5f6q0 m from a source that is radiating equally in a.q o hzv*7foqhxdy49zz 65ex+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 uniformly diss:i z/kljfzko-mk24 +tribulz -jz/k:4+f iskkm 2oted in all 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 dB at a distance 5.00 m from ukoyozk6 j;-, zwt*(h a barking dog. What would be the intensity level if two identical dogs very close t;zk-,w h6o o*zuyk(jto 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 intens0ie rwbem5m 1+ity level is 60 dB. What is the intensity lw5bmr ie+em01evel (in dB) at a point 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 level 5.0 m from a point source is 95 dB. At what distancew akzm j1 4jx-9.4aweo will .-ekm1j oj49wzxaa4 wit 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 tonvdet/3kqj 0ud1x tx c:)9b 8bne has a frequency of 1200 Hz. What is the frequency of the fourthnt: v0)/ cb3bx exqjt dk19d8u 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 on8f5w0n 1 u/a-eb:xg 2vkohkthe length of the pipa/:8h f0k1gevxn u2nowb -k5oe?

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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 ops0pdbtc : fib kx/10l4en pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2L?1tb 0x:fslb/4k i pdc0

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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,cw5mhm-bt 0r ends has a length of 0.80 m. If the velocity of sound0hm c-rmwtb,5 in air is 340 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 roozh.z5vbl* pwne;t-9bm 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 1:cnb 0s*i) .y bhun2et ae*kra pipe closed at one end is 330 Hz. What is the frequency ofsku0eb2h.cra :e1n*y) n*bit 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 shortest pipe closed on one end t1 8lo-r jbo,3eqyicik;x-x: nhat will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 3 3ix: y8l -;ri-ox1 j,kbqeocn40 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 n7a7 hsk -us93w yu*ew; 3oseza room 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 where the temperatureuep 2)*hr2kb8lgr xh3 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 whenqon6 41g1 l hgtpd8ju7 the speed of sound in air is 340 m/s. What is the fundamental frequency17gd4ouj g6n8hq t1pl ?

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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 amgv yp 0)c63vpoqjs2l1pm 1g8nd the other is closed on one end. If the fundamental frequency of the ojg308pmvg16 m1 vqpcy 2 )sloppen 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 800 Hz in air whnk,)oq+q b,iyi pc7 ry+pxe2/ere 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 sourcbkcqex,i+7,i)2 qyp+ prn/ yoes 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 the7f e6pnze1bl ysb/)lx jc-9 c2 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 sounfeb2/ byzxls7e- j)p1c6cn 9l d, 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 vae(av g kty1ygv*704is 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-H onh(bju( 81hph 6nhn;ljg0) 9e6j6xn s+tbuvz tuning fork to tune the frequency of a musical instrument. If the tuner he;6te0nx n hljh8u 6pbhj (ngs6 unb91(oh)jv+ars 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 ;3x . s rd x,hug8j9o /ov/dmz7;wbxbf8r bzl5produced by two horns are 6 m and 7 m respectively. What beat frequency isrl85 . ;b,bhg 8fdvub wd rz 3xoxsz97o;j/xm/ 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 orchestxpj j*vk er,l2) 5cvz-ra are found to produce a beat frequle pr)x*vjjv52-kcz ,ency 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 stationary 1000-Hz sound source at twice t:krz d b1 b;y7whyq*f*d/p5lihe speed of sound. The observer hears a frequency ofbp zyb*w 1/rfl:kh7*y qd5;id

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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 stationary observer abdx3r0l7f : zrt one-half the speed of rbz7r:3f0ld x sound. 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 of 1000 Hz. If a l/ud-6be o/qs.16cqlb fk at u*istener moves with a speed of 30 m/s away from the source, what is the frequency heob6du/-ck qu.sf/bt1l6qa e *ard 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-Hzr/ o;f/aycsht9ni2 6c*l pvl3 siren. It is traveling 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 standf cnh /v63a 29p*o tlic/slyr;ing 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 a2 .0v:n,p,ncb a,czo2 kiliom train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz andv .nlkin,mc c20oa,,i pbz2o: 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 120dj3-ttchvl43i 7a,hz km/h. The train blows its 400-Hz whistle. Tak3 3it hcdvtajl4hz-7 ,e the speed 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 teqm9 /v5i+q:bwa v0rp bm34vv oward a stationary train. The train blows its 400-Hz whistle. Take the speed p vw mqv5bb3vq:/mi9ve0a 4+rof 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/h. The train blows its 400-Hz whis+ht chd0*e9 aa/ ew7/q sul/vstle. Take thelcw dh/eqss a* +vhau0 //79te 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 m)/ s,hawyu6n 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistlwmn,h 6au)s/ye?

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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 sound in air is 346jv:4ipsa t +rckt(rn8 uaa 0*0 m/s. What is the frequency heard by an observer if the observer is moving away frov8ar*a:+usk j t( arpict0n6 4m 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. Assuba fjn1 cu5p -m:ef3(yme the speed of sound in air is 340 m/s. What is the frequenfy- (b3jpuf5cme :an1cy 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 determine the speed of an object. A 40-kH0xc m vzb+srti2t( q7,z signal is sent out, and a 42-kHz signal is returned. Assume the spee2xrb 0m( +,tq 7zictsvd 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.vnhn7a(c td o e i:9pl jz:x-qb2fg:, 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 conicalyt(x49u 1x-md knf)79r osbfz shock wave for9s mtzry o dbu19x-f(k nf74x)med?

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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 Stat03m s;dkyer 3v(* u6pbycqbz*es to Europe with a Mach number of 1.05 where the air temperatur;r y*0bqvezs6pc3(bkm3 yu *d e is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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