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习题练习：Physics Unit12: Sound
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://mail.5edu.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://mail.5edu.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: admin  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 followini k92efb s0+0j-w l gj twx:edzuwx1-.g 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 conducted fastest throug3qna .o v++v5rfgetk uk 8y9.th

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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 sou1c 8 fc(o1 3j7ioji0)l swnrthnd in a steel rod?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature of the air increases, /7 skxkzi;9fv what happens to the velocity of sound? (Assume that all other facto9kkx 7sv f;i/zrs 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 velocity of a 400 Hz sound, the velocity of a 200 Hz sound thro 8+hg 7h1p4glnod;)te b8tlpb ugh airehngo)blh d g8t14pl;78tp +b 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, *q-7cdja 7g jkda82wuoe -f1dthe wavelength of a 200 Hz sound in air is8j7d2f-c7aujg d1ekq-ao d w*

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencie 84yivnq9. bm2 *aitnbs 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 than 20 Hz are c*)b1ghwv;idy0o xj3 jalled

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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 s ;ywovp0a/-z j0t c(jy r9(hydxcw5k; ource is emitting waves uniformly in all directions. If you move to a point twice as far away from the sou (/0(0 5vard pzwto-ycx9 y;ckjjwh;yrce, 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 p+. wqh)d+ackgdn ds(1 roportional 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 poin,go9a,qh ynfph/3 .dl t source at a distance d from the source is I. What is the intensityang y,h,3ph 9dl/ .qof 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 radiating equally in all d( 5g8y .mw.po-:br9ebxuq-7j dlqfelnrym3 4 irections. What happens to d4 rb35pjwm q xl o:8egbr mnq9-e.7fy.uy- l(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 froml v*o rs4e.jm*z:.r7g tn wmw,ej-i +d a sound source that is radiating equally in all directions. Whve j.r7grs4 i w**e,w.omj :ndm-+zltat happens to the intensity level of the sound? It drops by

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followinlra 8ni; hamcwl nd,,*.0nw /cg increases 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 pure tonl5y tew7b *g7+rt+b 2s sp y4/wbgbgff 6e4)lse. What characteristic of the sound wbwspsyf*4 5gg7 4+ b b/be6ltes 7+trgy2fl)increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnesst w gtsrv-s yee/)8llufdn z:3o:,e5 3" of 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 rpkd-l( *fry/"pitch" of a musical 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 ai62f ;rkf(vwha r 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 waba 1kei;2 y4qrves 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 guibkquemw 1m2w 7c2uv5wn// b b7r e65vftar string and the sound wave generated by the guitar as a result of 7u575c16bw2//webkwv f 2emv nr qbmu 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 a5conn(j wz( s:w0o+ gnjk( dp.t 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 o +jxqkt(jg /fokc z4(9f the three lowestfq9kc(kzgx o4t+jj( / tones produced by this pipe?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of length L idff7b9groa m yyy79iu-: vf, 9s 200 Hz. Which one of the followinvify gfab-:y, rmfo97d9 y7u9g 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 resonaom:s:6e d2 y8n ,s6pm 1zzzhwiting at its fundamental frequency. Which statement is cor: p h6z,1wde6miyzz82o ssnm:rect?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.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 7t*-wix na1bs+:p f *nf y2pvjopen 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. What are the wavelu0/s bycb7ys 4,(snlzengths of the three lowest tonessb zlny ,ss0/cybu47( produced by this pipe?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.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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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 lengthwuwi. z-hda, 6n m*nj0 L is 200 Hz. Which of the following frequenci. nww6ij*d 0h a-mnzu,es 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 end is resonating at its fundamental freqrh 4;wk+5hm vty ta:0guency. Which statement i0hrahwytt kv +m4:5; gs 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 betwe2/x i:sl 2ijrr* 5krxven two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz2i2 :/rs*ivlx5x rrj k 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, thmz2nrws/f/ p7 e two sound waves should have

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded together and a particular beat frequency is hear :/4csb xpi m:.6jiybqd. What happens to the beat frequency if the frequency of one of the tons6iicy/4m:j:xb. q pbes 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 explain9r 9dl0x5 dt4q s e1bwoiru8h;s

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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 au5 i uapy+rfh9-p c3/stationary observer. The frequency heard by the obse ufrippu-+a ahcy/5 93rver is

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationary observer. The frequencvslrcw6p 7;mqgho340d m66/eg+ adev y heard by the observer isg/vwe6vsl3a rme d +0cm 67qpdo6h g;4

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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-:pa1sjk;,x(vd t ;lsaotjpud4y 7 *(ospeed, its half-angle will decrease by a factor of:;x(47* sykd uotpj,lvdt (aaj;op : s1

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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 pz )iw:: ump)mwp0qy t-9p.nw 01 f)np4uischsound of frequency 45 kHz in air is 352 m/s. What is the air temperaturpym 1wq4iuz:- i0 snpp)pn).f)wu9hm 0pct:we?

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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 f vbem*. )l:fvof sound 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 speed of sound 3 ;w7m3pwfwllupf0+avr 1fn, (mwj8nw/i3j p in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s pww3/,vrm +n 8w3mpww(7juifn0fal;1pljf3later. 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 temperav)d wg tzbeif8(,t.*8t xk n59msu+a rture 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 ; ubsi-e7antdb 4a..3d lqiq y7cl02o s after seeing a flash of lightning, the distance to the lightning strike is abo7l7i3eoy-s 24c ; .bun.bd t0qal iaqdut

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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 do pxg2*(oecm7x +z/mpt0 n:dsay the temperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You drop a stone into a deep well and hear6uxx-kuix8zh 1fmw 1k.9 ahe( the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is fm8ha1- uzkie w.6xkx1xu (9h 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 s h:/,:koo lis500 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 ,q;m6j/fkibskph . ,s$23 \; ^{\circ}C$ 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 inte.m ffd k*eod ,pfz6*m)nsity $10^{-3} \; W/m^{2}$?

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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-do0:tld 5i s9fa)z mgstx*d3e 7B 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 wit;v0n/h qlsfpj *nc89ph intensity levels of 70 dB anp /nh8svf0lp q; 9*jcnd 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 garag krk4n ,2 f5sph.npbb9e is 100 dB. What is the intensity level generated pps , k2b4hk.5r bfn9nby 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 6z: 5bq(hs goym 8q5b3o.0 m from a source that is radiating equally in all directions is:85goqq 3y (moh sbz5b
$6.0 \times 10^{-10} \; W/m^{2}$. 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 thaqh1w u,y/nxb; 5 zn awv(1rl3wt is radiating equally in xnl,1 qhb (wwavyn/u13zrw ;5all 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 assumi7*zye ;w0. njv4hsq qed to be uniformly distributed in all directions. What is the intensiy .vqnsq0e*wizhj7 ;4 ty 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 m. v ;7q)nrn /r(jowcux f(t.bdistance 5.00 m from a barking dog. What would be the intensity level if two iu(fjt.nr;v 7.qr)c m (bo/ wxndentical 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 fyhk:5e2p ffg.toz58m rom a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates fpkt5gyo :5ehzm .f 28equally 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 ,vn y+;opxu o d6 lar)a-it1+cm from a point source is 95 dB. At what distance wavt)idy+ c 6l;,n ur+a-p1oxo ill it be 75 dB?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a complex tone has a frequency ay1 f/;vet xhjv;8p.d1q j ll7of 1200 Hz. What is the frequency o8;lp tyv/ea lf. ;jh1vxj71 qdf 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. Wh 2ewsdln 0g.5on:tg2o at is the length of the piwo .ln5dgent022gs: ope?

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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 i(g;)ne)2uiy2psv4 e bw. n spns 400 Hz. What is the frequency of the lowest tone that will resonasn 4ugp(eb nv2e.ps iw) )n;y2te 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 vene0 d/pw) ri;cknr/-dlocity of sound in air is 340 m/s, what is the freqr0w;dni /c d-r/ pkn)euency 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 p 1l*hjhb-xeo+ l2m:lroom 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 pipe closed at one end1 k u/ysdyuok ar8:m 7.v.m6c7bxj* rd is 330 Hz. What is the frequency of1*va8j mb6d osr7k.ry./xuuy cd k :m7 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 that will have a fun;bqtb dd8e61ddamentaq6 8btd1 ddbe;l frequency of 60 Hz 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 room where the temperaturex +, mg(8j zfbo(/dvialw6 0/aeyhup4 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 temperature is dd)4f m/joh4v $20 \; ^{\circ}C$. 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 dc*j0h -d, p*rw z2y)xzgpxz/m is played when the speed of sound in air is 340 m/s. What iy/,d2p zh*x-wz p*gdz0jc)xrs 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 th14 eh*ikac cs8a+lb)je same length: one is open and the other is closed on one end. If the e *1 +lacsicb8a4)hjk fundamental 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 emit a frequency of 8bmqoqqmpt, bc+ znl;/ a6, e4,00 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 observer in front of the sources would hear no sounqlt,q +b4 6mpb onea,/m ,cqz;d?

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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,lsk5 e5arhwc k c3h2; side and driven by the same frequency of 500 Hz.s e;h5krhl awc3,2kc 5 If the distance from a person to one speaker 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 o0x( fw) roae;tf 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 a musipeu+hug99xzi;b 0rvfdr 4)b 5cal instrument. If the tuner hears a beat frequency of r4 pivxb; g eub9)f9z0+h5 urd2 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 produced by two horns are 6 m and pg bwl)uvzank8y7k;pk k 3;2; 7 m respectively. What beat frequency is heard when the horns are sounded on a;g7w l;zypkk2pvb; an k3 u8k) 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 viol:.k py .np:rzwins in an orchestra are found to produce a b.wy:.z n ppr:keat frequency 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 1 j12j/ 24.wi;vgspro6w aujsg000-Hz sound source at twice the speed of sound. The observer hears a fw2go1ip4.r;w j 26asuv jgs/j requency 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 st,)g1;kb1na 3 fodeoy iationary observer at one-half e;)bndoaikg o 1y1f, 3the 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 frequenc7/vbkf a6 )pzg57vo9jd hff+my of 1000 Hz. If a listener moves with a speed of 30 m/s am fg59v7d/b ah 7f6jz o)+fpvkway from the source, 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 is0ezb85h q(krb 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 standing along the roadside. What change of frequency does the85b0krb(e qhz 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 headl+ma:a(.mo 8l vz2f6nn zcp a*rq +.crd by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of th+. rl:f ov*zna anpm+m2aqzd (6cc8.le train horn is 600 Hz and the speed of sound is 340 m/s.

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward you at 120 km/h. The tr30u+ *tm1 8qmf ogloagain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whatoft 8gq3*+m o0u1galm 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 sthzzhbk9g:b)k9: c 5 wmationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whh :b)95w zcg9m z:hkkbat 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- s1p)p86h km9eh-pd+tng o)nf Hz whistle. Take the speed of sound to be 340 m/s. What frequegko nptefs n8)p91hd+ m-6p)hncy 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, and you h0t3b) .cn fcubq0zab e8o nz),xecc.. ear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whiqcnn.,be 3bt.c 08bc0e zfo a)cuzx.)stle?

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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 tra2hk)7u4ecefd,5q6s b eblu9sin horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is movinb, 7ke)c d2fquse4bl9 s65he ug 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 horn7 g+ cyvk9.*ha zdky;u is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching t7cz;v. yhya*d9 u+g kkhe 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 is sent ou 9cznikj:o ig-9 +q8b 60amebat, and a 42-kHz signal is returned. Assume -qe9:b0 ozg cka 8iim 9jn6ba+the speed of sound is 345 m/s. How fast is the object moving?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conical shock w,jxdm),jjs- n ave 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. Wr2leas t*bj6y: iz*: phat is the half-angle of the conical shock wave form6 pljysbr:a 2i*et:*zed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the United States to Europekjw3v 8 l2:xm p/,bkem with a Mach number of 1.05 where thvemml /x2k bw:jp k8,3e air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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