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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 is a fakj v*wp w4wv797.,lhi+ uosdo f3z:jalse 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 conducte;zv n2g)ion3r* p, xokd 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 s;np hj )txh /.5re09 rl/ifbpcound 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 incrq) mszmtaqc4 )9mg6u:eases, what happens to the velocity of sound? (Assume that all other factors remain constant4)s:gz cmt q)qu6 mm9a.)

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 soul4 f9ay(j )jiknd, the velocity of a 200 Hz sound through air isj()4a9lfik y j

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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 20yu i)zy-utv kk g3;/b;0 Hz sound in abvtky/;u-k) ; iuz gy3ir is

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequeryayo rb(w9d 14lrm .0 owy3o(ncies 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 freqwatfe jw8-4ntey pw ;r0)dz, 4uency 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 waves uniformly in all dsm fwd(o0r*vxcngn s+ 65h g)*irections. If you move to a point twice as far away from the source, the c* *n0sfnhgw5r o6)( vsg+x mdfrequency 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 divebve9y;u4v* mxa w,4k7hu l+c*,yehfo rging 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 pqrr f2 5bqe:;c;hx 3v2wgcu5woint source at a distance d from the source is I. What is the intensiqwu;; e2xv3 cghrf w2 5:qb5rcty 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 source that is ram fq8c8(40zn16iktt0*h pvb/w ks z njdiating equally in all directions. What happens to the intensity of the sound? It reduces tov/ ckfz4*j6i nnb(zq8 8kmtptw00 sh1

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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 sour02xfzhzz:,q pc j*mu/jf-dj* ce that is radiating equally in all directions. What happens to the inte:xh*j-0z qp*cmzz j/fjud 2,f nsity 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 soundwtl2uf63 w8 lduy7 ocq4y iur e8c36-j 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 emittin7,is+mcqsk do,x 9 :lxg a pure tone. What characteristic of the sound in,9xd o clks:7mi qx+s,creases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" ofzw*:q. fgw k+1 feife;do)rp 0 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 musicabe527b dc07vazl*hu.f f vc0nl 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 intx7cu:,k+ctjem u7o 0* zt(jz go 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 ac mpuldru -,5)re

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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 so(6i/be hyx ,rtund wave generated by the guiy tr,/ 6b(xehitar as a 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 whic9.trb h6:mz-zfk. y*mwqqp p 7h 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 o(ry ;aasrs0wv9: g.pty m+p2jf length L. What are the wavelengths of the three lowest tones produced by tjt v sg;my:(rrw+2ya9s a0pp.his 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. Whizwg3,6jn17q bd rl1o ich one of the following frequencies will not resonate in the samewbz3onl ,j67q1 1igd r pipe?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 ax rzkxxtue l1v)*t99//xt h w)t its fundamental frequency. Which statement is )thw/t1zv txx 9x* xeu9)lk/rcorrect?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 closez ac jvm8yuzc83qn)ncv- ndr.*+ -w3cd at the other, there

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pi otuits:6ex 3(5er/p gdnw0.vpe of length L. What are the wavelengths of the three lowest tones produced by. e:6ptns 3dgoiervx 0tu(/w5 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 pilad;8h fix (sh3c5o 8jpe of length L is 200 Hz. Which of the following frequencies will not resonate in txf(3;5ich l8shd8j oahat 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 attmyznwan c9yhui (; (jt*2eodlp 4bwt2 *b 2:/ one end is resonating at its fundamental frequency. Which statement is correct i9c ubbw:2yay; t2t/2nd(**molh p4t(nwjz e?

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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 t*tl2ncnh e4ml2/)tkd wo speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a daydc)/ t42* nml2k entlh 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,7w -zj/fic9 v;:pmpt-gq.tpg g/hfj7 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 bea: urjmqqhb2n58 q;,uet frequency is heard. What happen;58q: j uhnqb2re,m uqs to the beat 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 explaiiit 7346s ao,omu5 kjgns

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approache pnhece 2ewup-tl8oj-w4-7) ks a stationary observer. The frequency heard by the observer is-woh-)nt-l27ecw kp uepje 84

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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 frequencbgpp 9:qoj,nfbrss8yryin (.*7 wh0 -y heard by the obs. nyp(jq-o:wyb bs n, hrir78gfps*9 0erver 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 its MACH-speed, its half-angle will de/: 5 (px.sk-*ofr v fttfn;zfbcrease by a factor osf r5 f-v(bz t:nkp.f *;xtof/f:

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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 frequenkrs 30xiac0;x cy 45 kHz in air is 352 m/s. What is si0;xkcxa 30r the air 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 iw6m.6 fdpe2uan 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 speed of sou ep5hq)iemh +w/ c8n*und in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the nmpc8*e5 e +qh)/hi wuobject 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 temper hvj:fkof c5hgoo65iq):x3 1h ature 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 of2u :qguhi18i.4ppr8 ovk(mt7 xtu9ag lightning, the distance to the lightning strg9h:q. m488uk1(itpxvu oig7ta 2purike 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 tn ,jzfk,pc;o ,he 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 :lo /rd+3t; zud bca.rhear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assum;o/a:rd t+bu r3 cd.zle 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 frequency 5 *t6p eywnn yub(eulyx r;y0y04(0iwc5g n/3o 00 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 g i;;(exly-lpat $23 \; ^{\circ}C$ 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 s3u5ms bw mekb+m(-,eoyx/ i3sound 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 7wq3gyf + dk6n20-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 of two sounds with intensity levelsmkd14s,;lkgt pa 6j 86vo:ahd of 70 dB and ak;:hm6 dva1gko6,sj48tpld 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 dsy ;qv7,z4m9rs* mmq.h+49 s ubbm eraB. What is the intensity level gene*.mm zersuqma49r,sv974 y mhq+ sb; brated 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 thatfv7c ,mo42 (mafcn;mx is radiating equally in 7 o cmm 4f;v,m(nc2fxaall 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 dishaeb)n5isv) / u-en1q 1r3ndgtance of 6.0 m from a source that is radiating equally in all direct1n u-v/a 53nr)gebhdq1)eni sions 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 popdzo, 7u3/j lewer, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from 3lu/ o, 7ejdpzthe 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 distan, a*bhao64xvc ce 5.00 m from a barking dog. What would be the intensioc4a 6bhv*x ,aty 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 level is 60 /v dmkp wsm4 j,mv3uv/.1 zrh;dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equalv zus k3d1vp,hvj /.; /m4mrmwly 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 d:8h pf.b-8nium z 5mooistance will it m o5opz8nbmi8.:u f- hbe 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 u-p):3r 0b7qyyexw(daqkof( complex tone has a frequency of 1200 Hz. What is the freyqw0rk)(bp7( e3ud:-yaxfqo quency 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 harmonic of an open pipe is 900 Hz. What is the ytb0 ;vzhlal2j7l+c-lengt7llalcv-2zybhtj0 +;h 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 rebra(; qh*:eo f*dwf f7sc8o4msonate in an open pipe of length L is 400 Hz. What is the frequencyo4mwr:( ;fcf q8o*a 7f hs*edb of the lowest tone that will resonate in 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 sygh37i9*l) 4f3hxqnh;waigvelocity of sound in air is 340 m/h43)sih9qg wf; 3 xy lgin7ah*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 where the temperature is mq1vdkhp dej72fj 1yx e0( bk -i+v8n,$20 \; ^{\circ}C$. 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 7- 8)bf qr d,swkb8manpipe closed at one end is 330 Hz. What is the frequency of the third harmonicsa8 8 m7n,dk)qfbbwr-?

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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 shomw nxvm,e s-g6g9ubd97n7 ) ou46kptvrtest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound isbou7 ng7ms ,t 9vnpvk6wx6ud4g)m- e 9 340 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 temperature q8 7;qzuvv0 a:fny8 adis $20 \; ^{\circ}C$. 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 jt0l yzfm0/ ++o97hkdxk)kd e 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 ijtg y) ci;;qv u2 vj::qnqhw8wo5i7 *ss played when the speed of sound in air is 3w qi85oyg:n2)*vsw iu ;qhcj jv7:qt;40 m/s. What 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 open and the other is z 1anor8q 8u+tg w:2gaclosed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequegn 8g r1z2tw 8qo:uaa+ncy 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 l+pz)zr qqesgu1i47wy)-+su 00 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 obserug 4qz-)ewu sqsz1++ir 7y)p lver 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 byau0yhk + 3zgi +9d-znr the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person h+kdunzrz9 0y+ a-g3i 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 frequenqcy x3kzq +2;c3u8pir e3n 9qrcy?

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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 musical ;0zgl/t ,slt o/xi;yzinstrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrumenlix,o t/ylts;; zg z/0t?

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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 respectivel(k+/vrg4 fotv16xhy ean.rl4 y. What beat freqo+rv4(.fvaer1y6/ knh l4xt guency 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 vio;oc k 46at0)uto- lwkclin strings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a fca to0)4l ct okkuw;6-requency 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 1000t* ctph9h ggtytl86 2/-Hz sound source at twice the speed of sount/g96t 28 pylght ht*cd. The observer 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 vdc*hmx a lhh8a/xr3o,(dl : nzk:-,u1000 Hz) approaches a stationary observer at one-half the speed of sound. uahc* lv(/h ,z8d-oax : rxl:3kdnmh,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 eo+o btn-tpxli 01x5+Hz. If a listener moves with a speed of 30 m/s away from the soe1bixptx o+l5o+n0t -urce, 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 travelin(bs- cj5hbd2a: * vynjg 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 sa: yn2*-hbbjdsjcv5 (tanding 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 approache afs;0 5zmdnuh.e4 c3ys1 id0as with a speed of 30 m/s. The frequency of the train horn is 600 Hz ai03fzds4a. mc ;5 a0h 1eusdynnd 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 wh8 2e c*(n*xfbb0lkqee/ucqx+:ix9e/dlq6l nistlee/k*0lb/qx:x bcnqu62de ql+e lxfnec8i(9 *. Take 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 toward a stat :q*wbx kpcwik7c6+ 1dionary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequen* bpc d:w1qi6wxk +7ckcy 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; j 9-ot8 r(egjhb,:xj7dsws ltle. Take the speed of soundsod(x,wbt9j-g ;:l j hsj87e r 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 its whistle, (vk(fsz 6y9u:qoryent q9a.. and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. We. u6(on r 9.tz(afqks9:qvyyhat 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. Assume the speed of sound i a9o aha;q)/avn air is 340 m/s. What is the frequenc)/9aavhqaa ;oy 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 is 340bk)8go; uk n0vq:+ hyf m/s. What is the frequency hkokyg;) 0v8 f:hb uqn+eard 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 *tgzf 4rj0yqvp8- 9tarnim3(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 t4fy*g9 j0p- 3rtiranmz( v8q 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 wavzv5 7juzg- ,;pas:uqeg q0o2oe 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 conical sh6 -t 8wzq/n;h cn5y5l 4a :xnxcuxotb*ock 5ut o *;nx:5zwq6x n nbc/xha-yc 8l4twave 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 anujc:i x 8*t7from the United States to Europe with a Mach number of 1.05 where the air temperatuut8xa*ni:7 jc re is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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