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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 fal/1o s52ajxf: :j.ptfo o eh)xkse 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 thfo qae/nu .-il2f;(w xrough

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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 6;nlqtys l:t 3rod?

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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 j ueg /-if /m7wer:4srqi8zz- the air increases, what happens to the velocity of sound? (Assume that all other factors remain comus 7we /rqi: /re84z- zij-gfnstant.)

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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 24.) bfp qo21bv.nf jef00 Hz sound through )j.ffv bqfb o2pn14.e 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 Hz2bsez4 6d1ljsxty ;g i0a8tyx2*a x5q sound, the wavelength of a 200 Hz sound in air 2sti;qa*yxe4 52t 6 8bz 1 ld0axxjsgyis

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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,agolz : nu*bw/i*n44 ,h4)z ytwfga* d000 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 frequehnurv-21g cbv(;g wy43 +fim sncy 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 isk)zolog(.).j p pcgu4 emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be .go .pz)jp(4gkl u)co

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging wav0fyk;:bxy+c :0ht teqes, intensity is proportional to

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity of a point source at a distancezmby:+ qm 82kcw:w* um d from the source is I. What is the intensity at a distance 2d from the s:8bu*2:y+qz mc mkmw wource?

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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 is *hig g u5w7+l4r9uzall directions. What happens to the intenug4zu +gr li9hsi5 7*wsity 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 9;:z.u ij5h4qej11yuga yehj is radiating equally in all dire 1zi5 jhge41q9.yhjuj:e;a u yctions. What 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 following increases as a souv6:u lcrc9ii53 a;fvatml49 wnd 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 tone. What characte d0umb+6z b n2ti.bym:ristic of the sound increab.+:m u206yt dbmzbnises?

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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 notru i qh4gcn6 ,98ghad4a o01qge?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pi c :t op bqfo:7bfb9uto 6yju054rt48itch" 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 air intog sp2g-;.-fdi4sgv j8xpp lg0 water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacesa f9z3m3nh9f u1qc0p ment waves 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 mc li6ei0h6 g-fm ,ilj1;tnd 0generated by the guitar as a r-i 6hg d6 1m le,cli0i0tnm;fjesult 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 boter8r mqw8xv/m) +h+7yfor1f yh 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 len 6ig,m:jyfq- ogth L. What are the wavelengths of the three lowest tones proq-j6,: gyoim fduced 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 lna g vza7 2a-)w7yjc4xength L is 200 Hz. Which one of the following frequenca4wza vnc7a xgj2 7-y)ies 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 its fundamental frequencsr(:jf*8n i cxy. Which statement is correjr f*n i8(:cxsct?

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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 opeahm2pd e1q;j, 8k hmv4n 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 wavelengths of the three lg7n h.l xb36,el z++e87 puifbho v9niowest tones produced byn8.z uxiblni+epgb 7 oe6,h7fvh3l9+ 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. Which h* zyjm5dk*0u of the folmkuz 0y*5*hjd lowing 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 end is resikpd0ykree4:q.(.8kr2 fe d qzgox(,nc(z (v onating at its fundamental frequency. Which statement isy.ve0:2frngk 4qxdi.(kpk8 dqrze o(( e,(z c 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 driven by the same sour4yn3o1,9rq 6dyp2 jwy r* rqwvce. Each speaker produces a tone with a frequency of 200 Hz on aqr 9yy r4w631d ,*y 2njvwqrpo 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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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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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats, the two * b ysau 1-jx0i,5hjbosound 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 sounded57ss:dqs/ws 2h 3z-ms(m idjm together and a particular beat frequency is heard. What hap(2 s-szsmhwsq/3:5imsjm7 d d pens 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 explam ;1fc(cxas3mins

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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 heard byhzb6awwe8k /( the obse k8/6zbh(w waerver 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. T kh 5co:1tdq4bhe frequency heard by the ob b4dc hk:51qtoserver 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-xw)d+x inok9+h9vhk( dqsy+k4qg9oee20 p+aangle will decrease by a factor ofsp0 n 4 99kqgkd++x)oe9+2oyi(+q ea w vkxdhh:

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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 ty rmh,zi53j6ju3h2l air is 352 m/s. What is tu, lt6imrz3j yjh3h 52he 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-1kpn 5w71y0v k gybzk:mz d6x the speed of 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 in air is 340 m/s, a bat emits9e kk: o anp(cuy-gkb,)e;6.ht *qvvx a shriek whose echo reaches it 0,9t p( :bh)o;6ak guke .qnkxv -evcy*.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 temperaturde4j fxead/3 *5ftvfmw5v llv8u-d:m+yu-s 9e 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 flast )cwl mo zfdo/270(qqh of lightning, the distance to the lightning strike is aboutcwl(qzto / m0qf7o d2)

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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 cliz)+x0 lq* m30 wonmxj ,jm*grpse96mj ff on a day 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 hear the splash 2.5 s later. How k 7vgdn p,syv27zx9/ gdeep is the well? (Ignore air resistance, and assume the velogp9s yg7,zxd/ vknv7 2city 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 500j k fe;*h6bj czvp.,9w0ckld- 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 3e, +a zu,9pzbwl+(gaf 9zj uiat $23 \; ^{\circ}C$ 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 inten w4c3ktl3u isxi)rnuf)77m .rsity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensit,n 61g) ut:rp p4rmxd8hbc6h cy of a 70-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 levels of 70 rvn5wtqv;t + 4dB and 40vtr +5qw;vn4t 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 the intenl rlmf3 h*u/. ..jfhd01-m 1vf v0tznky;jwvksity level fvj *3lfykld0vf twh.u.mn1z -;0hvj/r1.m k generated by one engine?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source that is radiat-ag4m76cvnzkl* qr5 iing equally in all dir7q-vk6cg5z imn4la*rections 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 coju3pk9 j,x)source that is radiating equally in all directp9)ojcxuj3, k ions 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 assubnl5;mpuf*t :c tg*bs 6c-8bl med to be uniformly distributed in all directions. What is thsbblm-u6g*;l * cc:pnb t85tfe intensity level at a distance 5.00 m from the dog?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level is 65 kx/bi)7 7zamu/xxa9byf2 su)pa u+)p dB at a distance 5.00 m from a barking dog. What would be the intens)zxyp/ab)i sm9pa2a+/xx u )u 7u kbf7ity 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 fromru z)e*mm ;al kcu4)b5 a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a pointc;))u uz* 5blmrkm 4ae 2.0 m from the source? Assume that the source radiates equally in all directions.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity level 5.0 m from a point source xg-f. +f9 xffxxy.. p ltm8o5us(q1hr is 95 dB. At what distance wsg-xr95+8x.f1.o.yfh l(fqxpuf mxt 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 of 1200 Hz. Wci6r*juxrdpy )k51 qo(ey 1l- hat is the frequencdx u(1p)iy 6oc-yqjr k *1l5ery 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 har0bkr4m+sfgp;7xh x2j monic of an open pipe is 900 Hz. What is the length of thep 7h4;js02fxrgm bk +x 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 2 4qnujq7h ; p/uk tp/tak)eimq7x9 r9L is 400 Hz. What is the frequency of the lowest tone that will resonate uqp/kpamjh qxr9)77;ite9 kqtn/u24 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 pzwv5 5(2.v(q+6jfw3cg mgj c(c xekn.80 m. If the velocity of sound in air is 340 m/s, wh(wqmcjcf g+kwn pg 5zjev.3x(v65c2(at 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(,nfi.p44op 3df q cpi2:lfd bs7a1qw a room 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 pippkg3 xbxo,la2*8n0i u e closed at one end is 330 Hz. What is the frequency of the thir,xx o0pab*3 8nlk 2igud 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 afha 2xqsd- 6-*yl,n mclosed on one end that will have a fundamental frequency ofh-qnsy 6-mfla2d , *ax 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 r quw8*l c( caklk(usb/1mc-*voom 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 in04xz8pxaoh vpwx7()v9nu6 qru 6)yk h a room 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 w8ksie(1e scjroi+z 8t 6h h4n*hen the speed of sound in air is 340 m/s. What is the fundamental freh1 8hcisrt oi e(sne64*zj+8k quency?

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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 weh t7,1hc*fglgm 2fy2p qp20 open and the other is closed on one end. If the funt17fqef*pm0whggl, h p222y c damental 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 mirmvzna5i*(o;z6p p / t; lu6of 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 obp t6upinamzz;5*(io r;l6 vm/server 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 droq.tic60+ rg(s.5shh6 qcbt hiven 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 following is a possible th rh6sqhb i cht+ 6.gcq(5sot0.e 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 Hz9j l6f3:m3 yb,bxke ik 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 mmkax -67a-nw 6w t5xvpusical instrument. If the tunp 6xa-5nk6vxtmww - a7er 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 sounds produced by two hor m-ue24az2p ifns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day wfm 4 2az2uipe-hen 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 found dzo fh3+y/l0z to produce a beat 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 sam 3hy/+zo dflz0e frequency?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationary 1000-Hzz),1lfl8ap srrs e*( /s/ wadd sound source at twice the speed of sound. The observer hears a* /a l1dls/rds r swzf,(8p)ea 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) a-4*ahd9,n 1 sta3moxl)u an wapproaches a stationary observer at one-half the speed of soun)lamaa3nnx9*h4-1wds o u,ta d. 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 10- gp1jv4)v1x.vqmfbf .fkk 9p+8dl cx00 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? vffm8 b+.9cf1.v dpxjq1lk4 )kgv -xp(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 sfandzt1*fzr* xdv ;bkck , ,ad+n3,: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 frequencya;d*kkvczf zb13,*s+art ,n: fd,x dn 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 stay qs(9,jn)nn8o5 zkwi8 v-egktionary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and t- qzknjg9nisn(o)58,v we y8khe 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 youu84 45zvhk awy at 120 km/h. The train blows its 400-Hz whistle. Take the speed of5yw48 4hzavuk 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 stationary train. The trbtxc5 w jqk6nj ;g0+p(ain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s0q pg5;nt6b c(kj+ wjx. What frequency do you hear?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you at 120 km/h. The train blows its 400-cz2d iq4u 5, 18)b zqvaxm6prcHz whistle. Take the speed of sound to c)pmqi dvx5b zzu8ac6r 2q,14be 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 whistp-u,eb ;nubza pcb.y uv r jv4;m.9luh3. .eb)le, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/snb4y ;p ,3u l uevr..u.a)bz e.bc9vpuh ;bjm-. 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 in s5f0h 64)kmm/ qdsmxs 500 Hz. Assume the speed of sound in air is 340 m0xh4/mfq6 d sm5sn)km/s. What is the 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 traiutppr/ bkb b/+ij 08d/n horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What isb/b+/t 0drjpk8p/biu the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sonar is used to determine the sp5pm r5oy 5msr3eed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speemym 3 p55r5orsd 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 co2y.sh3kxc x;l q)k0i(vloq i+nical shock wave 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-an t5m7;ojpqvqs(7g*udg 1m * ilgle of the conical shock wav 7(gu7 s;*1i*mgjmovlqqp t5 de 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 f(sz7 j i)f1 dvsjz)w8the United States to Europe with a Mach number of 1.05 where the air1(fi ) sswdjzf78z)jv temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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