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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)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://51fly.win/test70.html
 作者: physics  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 statementqmt,4-gb e5i n?

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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 thf:tvm5n8ce p*x q,p/m rough

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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 ste33)auu mxiuex 2q(xl,el 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 svjntu4x l42-yound? (Assume that all other factors remain constant.tu-44x y2lj nv)

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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 z d /rglc52iu*fzh 4n7a 400 Hz sound, the velocity of a 200 Hz sound throughni52dhz g 7rlu4/fz *c 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 wavelengthbw l7sb2*37zbf x; fn)a 5rhzz of a 200 Hz sound in air7lb * 5nbzf;)h zxwzf 2a37bsr 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 20,0 jvdrxwo 47+)au) d4rz00 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 tmpw :s)/vl)n(ti5j l zhan 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 all directions. If o h2sae :i-y 5kqpn,8or)7uvnyou move to a point twiqnyi-ohkp sr8:uv)oe2,a5n7 ce 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, intensity is proportional to zjjg j5,l+ep2

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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 pointl-a z:zo,gbzh 47i8i sg3h -tb source at a distance d from the source is I. What is the integ7h8i-z 3,b4z- siz :al bhogtnsity 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 x kpkl 7:ll l:4w9)jg(n -eq,)qfeous from a sound source that is radiating equally in all directions. Wha9q ,- fu4qnlk gll )e7j(sxeo: :wl)pkt 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 source that is radiating equally iv ek+8 vay66kin all directions. What happens to t k6ky veva6+i8he 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 beco** c2chruk0)qgmn bm)k; x ir*mes 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 emittin eaayj3b.0g ,bg a pure tone. What characteristic of th.03 e ,abjgybae 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 k r hsx2k4pt7qra *bsg81x6(wa6g d p)a 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 nos6hg+jcg 3ufmds(*o4te?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes fro;+ on0(9u.fmzk jjitom air 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 wav ao1ei b/4k /n kn)pc-vz)mi(les 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+qi 7k-qtdew(u q:b0k erated by the guitar as a resuu7k k(- dq:ebq 0tqi+wlt 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 whi*zyg4 uoyo82u 2wkv b-ch 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 lengthihblr+8 x-f xime 17o- L. What are the wavelengths of the three lowest tones produced by this i h7r+fxbi-mxo8 1-el 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.alh. 7l-u d5o/zgqor 4 Which one of the following frequen olg5d/qz rl 7o4u.ah-cies 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 itgv n(l1gma l35s fundamental frequency. Which statement is corl(1g a35m vlngrect?

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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 t4eqv53v . * q0wixj4yg*; rzzsaeg4 nahe 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 are the wavelengths of thwrk7) gl 08xbbe three lowest tones produced by80x 7bwkg )rbl 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. Wjs,+ v1.z4k7.jv f5ph ftmjrr e-c 4qvhich of the following frequencies wil.7vfj.-r4v j1kp4sr h5 jq,vmfct+ez l 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 its fundamental fren nigf-3tq:m 2g ;nt 19tkrl)iquency. )tlgnfi3 qti: n 9t ;-m2r1nkg Which statement 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 speakers dw1xbwn 5g ;l.lbqp+7 yz;tya5riven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person pl b;n. xwyz5 t;lgq+bw17 ay5is
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 ;8fd3ocqpco -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 togethmwfj8 ,mf;u(ner and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of th(mn mwuj, f;8fe 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 explainsneft3t 1+9oan

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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 2s9 tgbi; dbub4djzom 8i4 a;3heard by the observjui;ga4 29bdb34s;iz d bo8m ter 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 stati 7twfm cc)(pd4onary observer. The frequency heard by the observef(ct 4p7mcd)w r 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 doube3 -*yacdhn ubv6.l4kle its MACH-speed, its half-angle will decrease by a factor o * n36.hlv 4-bycdkuaef:

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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 is 35m m jim4 hx2tn66sr 25c*dozld1eys0+ 2 m/s. What is the air temperatul50 dncsesi mdj+ 64 zt6xrm2ohm1* y2re?

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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 atygj 3m0aao0 aed a)(r* $0 \; ^{\circ}C$ 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 spez ( j1elwvspw*lgs:g;l:1 4cied of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was t z l j(glpl:;1gsw iew41vsc:*he 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 echogg)m:0p(fk cp 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 afterghy2.s-3 y.ja 2vo41o;ndymdor d/id seeing a flash of lightning, the distance to the lightning 2n -g d di.ry4do1a m;y32oyj .vh/dosstrike 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 thq vp-x*a/9ume e 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 lr bg/lg3+ghd ;:mv.bc xbk8.hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, an:3.hbrl8c/ g.gbm gbdxlv+; k d 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 f 2ztv)iziui74 requency 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 i906rn doy0fa(ok4 zwxj;p3 m$23 \; ^{\circ}C$ 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 lob-e 38hg5 s5y fyoa7dj. afk-evel 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 sfc+13js 4vkhg4coxfqvvs ,iw n)( 0.vby57rcound?

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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 intensity levels of 70 dhmg24lrirppt f 8.92pB92 28pf4pgp hltirm. r 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 a garage is 100 dB. What is thie pz)-2qe 5latrg /;ee intensity level generated 2za/ i rqg ;el)pe5t-eby 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 equally 8oqn ckwb8(oym(hgl (8-xs0 oin all dsog8 hnyb q(0 -8cowm(k8(oxlirections 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 from a source thatp*f4o;m2qc9a hr8 qrq6p ,mnq is radiating equally in all dircr4nrf8 p 6q,oq*mmq 9;hpa2q ections 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 akremt gi- a6*;bout 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from eamt *r6- k;githe 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 a barking dog. sdv 2bwrb0ul1zp.;8f What would be the intensity level if two identical dogs verbfv2r8; .1psluwb0z d y 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 level is 60 dB. W4e j15r)jvik hhat is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directioj)jhi4ver 5 k1ns.

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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 nqfjt+qia6 kre+ ot78,pco*i/. dr3c a point source is 95 dB. At what distance will it be 75 dBnf/ a8 t+6i3cj+,ki pcd.qt7q r*eoo r?

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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. Wh;6pky.w mo+4m sik5+m ig.ltnz9u:dd at is the frequency of the fourth harmonics i.zluy5.mnw4t m+po+ md; :gi9k6kd?

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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 o yofrwy0)3v;v f an open pipe is 900 Hz. What is the lengtyr f0v)3w ov;yh 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 ovi m2-h j-u3.d6 bwtb ixna/b9pen pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe 29b6/vaht .dxmn --w 3iibbujof 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 end;qw68m qzvyj 4d(aol)s has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the fd j(lw4 ;8)vaz6mqoqy requency 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 we. w()j8f rv/xab +1fvfojdu8here 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 end iiru.b n :(,in3fx its5i*w:k q okyb(0s 330 Hz. What is the frequency of the third harmonick:(nys(n,ti i b b3qxiur*.w:5kiof0?

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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 3jjvt oq8l .0.v1bj7oz*nydp on one end that will have a fundamental frequency of 60 Hv v* jpq1oj b0ztd8j.3o7ln.yz 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 ro5q4kh5 5zxd5b e)* tyi qfi:0zsj.elfom 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 ri swlhwl/7;ryr 0 b0pkt.pt(-oom 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 length 0.75 m is played when the krcw3d nf13x /speed of sound in air is 340 m/s. What is the fu33r1xknf/c w dndamental 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 clopc: bv1r:tx3wsed on one end. If the fx 3bwpc1 r:vt:undamental frequency of the open 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 ;aaeu8xu()np+ 5ttio emit a frequency of 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 the so( ;+atx)upn8t ioaeu5urces 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 y: 1 r+ny+hg fn 061j/u8lrqvmxn6dz7lrfwh7 of 500 Hz. If the distance from a person to one speakerw m: nr0gxj/7 8vrln 1fr17lh 66y du+nhz+yfq is 5.00 m and the person detects 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 frequ0/qr: v by*ohgzqh43o ency?

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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 t 82lolpmiic *tl15 tkhj*;/w3jcj*ewe: fk +bhe frequency of a musical instrument. If the tunerhpkel i ;*wfi:cbe8jjm*35l/c* t k2+tjwlo1 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 soup xn3kj3v 8:whnds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a pkn :h3wx8j3v 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 tw4d8xk8oam 1 :w r2itsgo violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequeno gsr4dtwm 81ia8kx2:cy 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 gm7ku8-hj8a q 1000-Hz sound source at twice the speed of sound. The observer hears a frequ mhq8ag 7ukj-8ency 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 stationa)/ 3k3qe,eee6fuzrwdg u*+hc ry observer at one-half the speed of sound. T z/ +u)rch*qeu,wed fk63eeg3 he 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 spe7b) hd(ig*o *lp3hfr8rpps r 7ed of 30 m/s away from the source, what is the frequency heard by the observer? (The souh d*slr(f377ppibo8hg)r p *rnd 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 travelot;/tz agvq -ix ou ;pc171:fling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an obsecuaq1-/ fzoplx 1tt:o7;gi ;vrver 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 train approaches witwf;4om r:z0u 3wt; jqwh a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sounfzo w;;mtr04qu3j ww:d 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 t8r z.hve*e xl0iht 1*urain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What 0exh8t* 1ivlzeh. ru*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 trainmchb9th:3e (rcoa5b:;zk)q(f8( z d s k.kwrq. The train blows its 400-Hz whistle. Take th o:t emqk. (hz(kbrdw )a(:k;5cqrh8zs fb3c 9e 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 at 120 km/h. The 8 j5mqmt+pbbxekhzu pj;o56-9*0zf ))ivj pb train blows its 400-Hz whistle. Take the speed of6)b5i k 985o zjmmxz;h*+jfpu p jpb)e-b vtq0 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/53vfcg aa1 b4l va5nj-h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound tanfba5c 45lv-vag j 31o 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. As1+ .lofvdnuy 0sume the speed of sound in air is 340 m/s. What is thl +vufyd0n.1 oe frequency 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 uu32j *g0 t aqv.xci4gsound in air is 340 m/s. What is the frequency heard by an oj*g i. a2u4t0 vq3gcuxbserver 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 qddf 9:e6xex1an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving? fxx6de9eq 1d:

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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 produs jmjm3norf4.q )/ 9ojt.r1 ctced 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 hq(/)ef xve +;vmqw0ythe conical shock wav( evme)/0qhwyx +q;fve 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 therzsn0 rt; zo 3hw(l(5e United States to Europe with a Mach number of 1.05 where tr((;5zw no30lt hr ezshe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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