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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 stateme j8 jtf x;;qi-waaqa/w.w8 kr7nt?

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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 conducted5mmy j3t.8 xez 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 steel r1i6ru :/xw10osj kp xxod?

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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 incrptt1s)) jet( )d il8weeases, what happens to the velocity of sound? (Assume that alletwt )dp)j)( eis t81l 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 velocity3,pfqcvlj 6f. of a 400 Hz sound, the velocity of a 200 Hz sound through fc6.p fj,lqv3 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 wavelengto74qe1co9 kve h of a 200 Hz sound ikoq7v 4e9ce1on air 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 greate +pos rqs;aqs.,7q zj-r 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 frequencjaud 0 )* hklykpe19-zy 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 waveqx 26uk ,n23ui6;pm xkloz 8 6bnsj2qzs uniformly in all directions. If you move to a point twice as far away from the source, the frequency of thuibj 2m8 26z6nz n usoq2 kk3p;qx6xl,e 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, intea:d95g. gwchjv9a sisgpn * 0)nsity 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 frorqsg09wqq( :rpe p*. 4 hrl2plm the source is I. What is the intensityrqp*h 4err. 9:wgqq2sp0 p( ll at a distance 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 socpm5h71z 1a jpatxv,9,khokl ioz,.f - 1lsd,urce that is radiating equally in all directions. What happe79lv 1s., ,hmfip z,1kp-5,haz1kao lcxodtjns 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 distan l8h ,ya 8y94scq6povnce from a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? Ispy8 qo6n9h,4clvya8t 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 increa,wtr3saa t2 4+xaz,byses 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 pt9eeeu*l6tl 1ure tone. What characteristic of the se 6el1 *eltt9uound 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 note?p 98bd;hcl.se/ ;ug7ps qxko* ykwlqr-*, ew5

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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 no9b k:y 7bbu0 ft9a2t4rcl1dihte?

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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 e4ej7 xjdn 5djuoce(8;. wsu 4air into 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 wavesvfw rk/i. wmcv1/ .zqc4d)k z9 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 generadd)igmfb)zj,2 dw uu.- s0 ka(ted by the guitar as gs(fd dd2 b,zaw)u.-)uik 0m ja result 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 open at both ends, t 2t:*os0 f1fwwjxpzb5 here

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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 lowewi2f7pd m73-e j fu4tzst tones produj 4m2 u7e-pftdf izw73ced 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. Which on /oln3cxaio81(1bbhxe of the following frequencies will not resonate in the samecbolo (x811ahb ix/3n 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 anr-u9 0hqz6f8lko)3gtcu g9 it its fundamental frequency. Which statement is correctoru98cfu 0)k3 lnz q- igt9gh6?

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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 endc:rm)p+b4f5 6 uy hhq79ebcdn 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. What arezfh 0fuf 23yzo1s-fb)3 x7ptq the wavelengths of the three lowest tones p1 t0pf3h 2ffozqb)3xzuy -sf7roduced 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 oly,p *-rkmtyh; ,mf1cp l z-z2 u;ark.f length L is 200 Hz. Which of theth*lru1 -kkmzpra-lp yc, z y.2;; m,f following frequencies 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 en5w 589o bs4oplqbeud5hzo1y7s to +/gd is resonating at its fundamental frequency. Which statement is +p5b9 wt5hs5q4u 8ebzyool oo7/sd1gcorrect?

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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. Ehv: *5 pxbh.v )shd,xcach speaker produces a tone with a frequency of 200 Hz on a day when the*c hvdx:v ,.5h bxhs)p 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 c.cmj9+xb3*exvqwv 8waves 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 particulat4b+ . cvo*rvor beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is inotv.or+ *c4 bvcreased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift expy: d )h+zye*3v*wnli42 a)pnxf e q+sulains

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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. b0sm j3smd- ( rdaxmg;i/ai) ,The frequency heard by the observer i)dg0,m dma( ;bims-asixrj3 /s

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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 obse6(vgwy/m r he/64nfkerver. The frequency heard by the oby/ nvee4/rk( fm6w6gh server 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 itsx w7r;:4zs ,h6 htpsta MACH-speed, its half-angle will decrease by a h,4x7ts ; :ztrwhsap6factor 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 ivlj:5vz f4a)t n air is 352 m/s. What is the ai5 vvjt: 4zla)fr 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 speed of sound inmc *d(x cgpeo1)p ky4*/y,dpc 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 speyat9j afu (2ny z)rf52 hrap.l(9zy)jed of sound in air is 340 m/s, a bat emits a shriek whose echo r(yay29 )rjlt2.)f py9r (h 5fuazjznaeaches it 0.0250 s later. 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 temperature isx(ajrv9q d;u kh9p(i8 $0 \; ^{\circ}C$. 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 seein l2x6/ 0wsfdze*nu 5i7wez4ffg a flash of lightning, the distance to the lightning stff s u xe6d7iw2z/w*5enz4f0lrike 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 qi) mbeq-bsy pcg ksw5(/ .j24is $15 \; ^{\circ}C$. 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.8s5 o3cvrs+rb 6copt a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the ve6o8p5s+tr csob 3 vc.rlocity 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 ofn: rs;(3+ek9fxps;p q czw*y olk2bh7 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 airtz0acqd; -(ru*wj qx.r z3p+ q 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 sound with intensh,akjv-h ,gs,ity $10^{-3} \; W/m^{2}$?

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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 so78*0r0bg wxc.gbfd icpq73cj re ba,7 und?

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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 sou xr(up:sih pp d4z1m56 *0rznlnds with intensity levels of 70 dB and 40 dB?*:pznpd hi rp6lxz5 u(m 1sr40

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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 gzq u ib7q 9t;uu2b:8cgarage is 100 dB. What is the intensity level generated:q uiu2uqg78t; z9cbb 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 lqsoi p idc,e f2+v8z36vmvfj n8y;(06.0 m from a source that is radiating equally in all direcv i y+8 ;p8sv32vnm(idzffe0 ql,6jo ctions 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 rzc/ky2n n+ycqu .8s.6.0 m from a source that is radiating equally in all directi/qcky. 2rz8 uys +cnn.ons 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 mWw;nsg4eve.jd 0 txy (7 of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the dg0 dsv y.74e xn(w;tejog?

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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 d *g*:tikcb2 hj h1qi1jistance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are barking?bc 2jiq igj1ht*kh:1*

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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 inteeg;aswd d6zsw i3u pka715q,b,.rri6 nsity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from t,iz d73w6i1. g5wbak u, 6pe;qrsrsadhe 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 i7abrdq9:yg8*xzti:d: 2 ufcs vqs 5 1from a point source is 95 dB. At what distance will it be 75 dBq :qz2sb*d:1:5c i vuaygrd8fi x79s t?

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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 is d k 5 u0*hqg:y7nhj2mithe frequencyjd70n2qy h5ihk :u*m g 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 haresx(,cn a uao (a+op-3monic of an open pipe is 900 Hz. What is the lengthp+3xa(s-,o( nco ae ua 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 is th9p:f*+.bw/lv*k:eoyvp unb 5ru k 7bxe frequency of the lowest tone that will resonate in v lbk/v+bxuk5f*bpuwp.e 7ro9:y:n *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 m. If the velocity of sounz- 3k wjgy*it b02u.wpd in air is 340 m/s, what isw-k.uj*ztpyi 2 g 0wb3 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 roo19dxmtjuxx qeu7g*0 4l0n*avvka31i m 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 pip3vie,ntj ):mx4(nkpbw n: 0fte closed at one end is 330 Hz. What is the frequency of the thirdemv(nfbn:0nx:pti t4,) 3jkw 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 tha 2a4x .qb.hmeht will have a fundamental frequency of 60 Hz on a day when the..4mx hb2haq 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 room where the temperatu+3)lw(x2br wq ;qwdhkre 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 w(ol+i04/f7e.6jh p hh h yxcjwhere 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 plawg*:sc2i fay )u d7bl( he47nkyed when the speed of sound in air is 340 m/s. What is the fundiw k:f7ngub(2dhe)sal y*c47amental 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 other is cm41 (u dwgj lxuz0b:y7losed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed 147wg u:zydbjm0u( xl 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 where the apii5m)fd3* ybi/i3k velocity of sound 3)i* a bii5/ypifd m3kis 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 placed sideo a7o )q22+cgmytoq5b 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 follobq+o2oac yo)5 t qm72gwing 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 frequenc/ rzxiatv,24b.9 o-ismaz 5x 4z t)otmies of 440 Hz and 444 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 aggwr1gb8(zndgjb rltq + :/ 38 musical instrument. If the tuner hears a beat frequency of 2 Hz, what is ng:1l bzg(q b gr3 w8rd+j/gt8the 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 rla h *-i65 d8zlnrw10cnghu) lespectively. What beat llncl*1)z0w 5 u ag6hih8nr -dfrequency 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 are fmor14;csy r,d 2rbpc1ound to produce a beat frequencyb c24cmdrr1y,s por1 ; 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 approache,cx0 2kt- hp jgar2q;ls a stationary 1000-Hz sound source at twice the speed of sound. The obserkx hr02-gtca l2j;q, pver 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 of 1000 Hz) approaw*5be donsj( z*pa t68ches a stationary observer at one(zn* e8pbad 5w js6ot*-half the speed of 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 listener moves with a speed ns; ( u,opsy1mof 30 m/s away from the smpu os, (;n1ysource, 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 traveling at 35 y:,1 im3bp /prjwza*u 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 along the roadside. What chappm yb,ja3i:z u1w*/r nge 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 frequencc 45nbozc7 qy7y heard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 6 qcocb7z47 y5n00 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. Thg.jk a1 hxu rq8,he:,ee train blows its 400-Hz whistle. Take the speed of sound t hg:j8uar1qk.eh x,e, o 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 trp(p3hd9zlkiz o(c x8-ain. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you h-xc 39 iz8 dpzph(lo(kear?

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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 trm2o8rkbh ;1u9d a*l etex*bd 7ain blows its 400-Hz whistle. Take the speme db 7u k91ret;ld h*2ba8xo*ed 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/h. It blows itnaj , dhm.2 g31scqcu;qbtgho o) *k*.s whistle, and you hear a to)qnh2,g31.okbqu. amcjs; h*tcd og* ne of 400 Hz. Take the speed 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. Assumep1hn, , i5wmglp f1+4k xyvrug5a -p7,uo .hzm the speed of sound in air is 340 m/s. What is the frequency heard by an opza hp,wmk, 1og.-y5g,hvm7 l n15xu fu+4 rpibserver 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 jhtq7kdru yw1419v x )horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by dkrh1w491t jvx7y q)u 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-kHz signal gr0yepxtj1/j;7vqbjl 8 mdh3)3/dguis sent out, and a 42-kHz signal is returned. Assume t3ryg;1pjuh td)lm j x3ve 7/j0dgb 8/qhe 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 supers 6l0jpkniw6 p8onic 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 conical y+oyh v-/mj+bnc+1 ym shock wave fm-yob+j+y ny1mv/h c+ormed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplanenk4 1)jjnk da psd*4*-9 nhh6d6gzgyb0heu( q flies from the United States to Europe with a Mach number ofy nh4zjk0db9nu-( )g* p 6q6a*1dhdjghkn4 se 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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