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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 false stateme1amcaoj(i)x,uwj xqw-en 4g :*ic 8m9 nt?

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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 c(404kfqoc5aduxsvach4 ) /e odzth /:onducted 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 of81,uyi; vy8ecuywr7b7 (c mzx sound 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, what hapig*kb5ndg). x- t hcp6pens to the velocity of sound? (Assume that all other factorsh6x- kp)gcb.* g t5dni 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 thr2,. hyc.wrkawdv/. svough aia v .khsy/ c,v2.rdw.wr 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 wav .(ppmpxb2gl;n6cz g*h+/m liaz*t5w elength of a 200 Hz sound in an clax p 6w (zp/5hmtg bg*p;l*m.2iz+ir 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 frequenck:ef)qr c02 ym5hhbr 5ies 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 fqr-avi8p4r3dq mqk ca5n81, drequency 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 w6oaa b,o szx6kr9w *nct4n9:directions. If you move to a point twice as far away from the source, the frequency of the sound wi ns6:rk4to9 a6ncwwozbx *a9,ll 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, intensityv8nih+k* wk- v)7zsuk 6xtr; s 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)w 6bt yyivb;2 *av3nd(xl;cl at a distance d from the source is I. What is the intensity at a distance 2d 3 cl6a;y vbyn2w i (xb)t;lvd*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 fro;wi1l ;ko0h: )nqw: jdakulj4m a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It redd: wa;uojw0n1kij ll; q ):hk4uces 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+,ji*rd04jfxysd vfc:;o 2 uaxbd+x0 is radiating equally in all directions. What happens to the intensity level of the sound? It drops x4c;d0dx+r y*:vjdjbo f +f2 sx ,u0aiby

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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 jw/wkvff27b e (;5bvx 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 tone. What et7;q lk 1k,ibcharacteristic of the soundil;qkt,71 ke b 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" ofradbiz8 z j fa7y13,6e 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 nw 6geb+i 6)yogote?

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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 into w98 v(4tcovu3bjw mi 9gater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wales9h 7+vtkxg:px. )yb x(j,d ves 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 4j /nfuh3e-9-;0jkjfl+ ilvuic y ps:wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. W+hv0ifs luj- j/ijp-ue394fl c n ;ky:hat 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 oa ku z8-/g o9r5wnyri zr;3rmwlqu8c7*n/*pch 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 length L. Wh*d 8kk a0f0m-uhzt0lv at are the wavelengths of the three lowest tones produced by this pi kt v*0fhk 0-udmlaz80pe?

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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 27evv mlo zbjrn/2.24eu p;xq600 Hz. Which one of the following frequencies will not resozbq7x /oe2p2;m lu4j6.nvver nate 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 frequency. qo sb3fqtn18s: g1 *dx Which statement is s :fn*qo1bsqxg dt813 correct?

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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 closu1 su xbnrzw( ;7p/n1ied 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 wavele.i ld0 h (lz9tpkt5z3ojd2yi *ngths of the three lowest tones prkt(0 .otz2l dhii*jlzd539p yoduced by this pipe?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in a closed pipe of length L ixgsv+karu 6on;, lp*hj-o5 26t+xf rlb 8z(jrs 200 Hz. Which of the ubnr6 ljxgjf8ox+ o;lrrha,k6-(t v 2s*5 z+pfollowing 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 resonating at its 1 :3lp 2t. yawq n8l9jp f4nxby*7asxofundamental frequency. Which st.s2q y4x n:wa1aob8 xpyj*l3t ln 97fpatement 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 i2g h na:+ eh5ml.lk:espeakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day wlha :enl5m.h+ie g2:khen 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 bs )jehl8uihs+8hb- c qd ;2h1xeats, 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 beat frequency is heard. vfj m))mz:4y-s*7:j v (: ouak:bdevp.v jyjw What happens to the beat frequency if the frequency of one of the tones is increasedm v)vkj-a)v:bz:j(w o:j: mf4 eyysud j7*vp.?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explain 5ks9kx;k*t8gkt- sgi 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 stationary observer. The frequency heard by the 6aovk3gtg y6 fb fih- z+n,4o8observer i 3yzgka+8 i bvgt6 ofn,6hfo4-s

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationary observery 0yjcyf qncnv )3 ,dd +z-1i4f1*xibf. The frequency heard by the ob nf1xzj v+ cdf4)03d *yy ibq-y1,incfserver 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 decr(;: pm o8d0k3oedtpfkease by a factor 3:8fpmdpdke0o o;t(k of:

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of an ultrasonic sound of frequency 45 kHz u6pm9wa b7g q5in air is 352 m/s. What is the air tempera9p 6mb gwu7a5qture?

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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 ai3p-uyve*+c d za;u7ka r 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 emits a shr kmxi: bop x3wd..0y0uiek whose echo reaches it 0.0250 s 3 iwyxp0:okxd.0u mb .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 echo3iyc9dau2 :g s 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 after seeing a f;ajctp g6hn q*s78c (klash of lightning, the distance to the lightning strike is q7ha s; cjg(pcn68k* tabout

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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 ddm i:n;8xy7ycm4-1 o g uiv9lon 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. Hoz *er 5cve354:tjx f:pfnnxs9w deep is thec nzrxv45ne:*s eft 9p3fx5 j: well? (Ignore air resistance, and 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 frerhrn n/. wp5d7x.l9 m(dq yeb)quency 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 a q 2):gs6dx8lhjqss5ft $23 \; ^{\circ}C$ 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 withn+w:un rr /j0p5ct t3i 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 so j; lf4o*h.bwqund?

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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 ofek0m;+)cdf qw6 0wgyupz4 9 bv two sounds with intensity levels of 70 dB and 40 pymqfkd);zu+ v00weg6 49b cw 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 ik57e*w -alaxcn a garage is 100 dB. What is the intensity level g7a keaw-l*5cx enerated 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 radiating equa3c bvr 4l87gwhlly in all directio7hl84 gb3wrcv ns 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 that is 4 *xz qo.7jh,l p6 mq(z7rzfhtzuxt::radiating equally in all directions iqoz *pzu4m :6(h r7 zjlzx.thxf:7t,qs
$6.0 \times 10^{-10} \; W/m^{2}$. 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 deliver flmtlb )c )+1zfzd3e:1 nzif,s about 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 ff)zm,l z b1fef1z +l3)td: cinrom 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 distance 5.00 m from a bark+g x)*gw dmq/ zcmrupir5ca/)*tts7+ ing dog. What would be the intensity level if tr+gtug)m*7s +m*z5 q a/cct idx)p/wrwo 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 ff1zs,b,gdube fl4:r6k km25intensity level is 60 dB. What is the intensity level (in dB) at k,r:f4 bs 2 6,5muk1g zdleffba point 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 xu 3j:l.oe3a.-tjp:-mr ms fcis 95 dB. At what distance will it be 75 dB?3tcua.m.- js-: p oj:rlmf 3ex

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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 complevtp/. vi67unr +wal4nx tone has a frequency of 1200 Hz. What is the frequency of thw7t6 +u rvn.ilnvp/4ae 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 open7bl ,a2uwyz9t8jy 3r z pipe is 900 Hz. What is the length ofujtrz,l7 zw2 yy9ba 38 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 rezht-yw.ai9skc5+ yb (j7tl2hsonate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that willh9.cs-( tablzj 2+k i5why7 ty 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. b ix8ja,6gr:xIf the velocity of sound in air is 340 m/s, what is the rgb 8xx: ij6,afrequency 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 ec(-mg( xsaibf 2fbnf5 x+2y($20 \; ^{\circ}C$. 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 boo- nz1jz q-6is 330 Hz. What is the frequency of the third harmoniqnz -oz-61bjo c?

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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 fn(+d6 irko 5l7plv7mshortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of p+f6r o lk(v757mlni dsound 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 temperature i f 2jhg/cco,i9i0n f: tdpw2/js $20 \; ^{\circ}C$. 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:qokw./xp37wrb; dj k in 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 when the speed,w5b,z fx *asa db2-qe8dh xvjus99m) of sound in air is 340 m/s. What is the fundamental frequjd b9sx8hfeu,dzb a,-aq 5 s9* w2x)vmency?

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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,/ qswk;l9 dbg other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz,dsl, w/gk q9;b 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 800 Hz hzl i36l8ohi/u hpo2jp3y f :9in air where the velocity of sound is 340 m/s. How much farther back would source 1 havo: ij/l2y6h 3lh3ufi8 ppoz9h e to be moved so an observer in front of the sources would hear no sound?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two speakers are placed side by side and driven by the samekm5o6- qfcymlf7gec /sp 2x( 0 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 the distaeyc lm206 kgxf7o(-c5 qpmf/ snce 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 is67d3jla0wx tm 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 g8ncpd6e8m5tet1av8 musical instrument. If the tuner hears a beat frequenc evepdgt8tca8m 186n5y 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 horns are 6 m and 7 b(;gp+17 iu x e/fv4tq1gapu 7fa cfx4m respectively. What beat frequency is heard when the horns are sounded op fvuub;7x e+/tx(4 pc4fgfiqa g711 an a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin strings on two violins in an orche7/pytxv8z4 lueyv-kn-h vo .p+vx7 y4stra are found 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+ 7u/xyx7nk-.v4 vo4-yevz l 8 yvphtp 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 100pssfkw 919iagb6e r7- 0-Hz sound source at twice the speed of sound. The obses9ekipw 9r6-abf7g 1s rver hears a frequency of

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequency of 1000 Hz) approaches a stat d o2+ fvlxcsik,pc f20;cn7v4ionary observer at one-half the speed of so2cfc2pl+dv4f, kin07xc;s v ound. The observer hears a frequency of

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound has a frequency of 1000 Hz. gh* 5p9ju-6vkc di8bk If a listener moves with a speed of 30 m/s away from the source, what is tb j5ph-*8vigukd kc6 9he 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 trav ocqb8+9 gb,pgeling at 35 m/s on a day when the speedp+c 9bob,8q gg 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 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 stbluz tu/gk(z+*qd*f ;c nl3i, 1nak,vationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and theuqkdfa1kgn,v3 l* zi ;,n(*t culz+b/ 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 k(oy bl6;e+x vndp9me) m/h. The train blows its 400-Hz whistle. Take thxp 6 yeb n()eom9vl;+de 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 stationary train. The train blows m;; itkamp u ,7ynwd7t(a4 1uxits 400-Hz whistle. Take the speed of sound t4 (i ;t myd;,1pta 7wk7xnaumuo 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 train blows its6g3(e 6ya ;f7dfsbob p 400-Hz whistle. Take the speed of sound to be 340 m/s. Wh gbp;7feb6oa6yfsd3 (at 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 whistl,8bfr j e1qcig6i *ii +o43hkle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequio +ef1 3k,ic8 6hjblq ri4ig*ency 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 inniw4+fkn .i0eth q6)kv1ci w * air is 340 m/s. What is the frequency heard by an observer if the observer is moving away fi0ifqt4 wnve.n k6*k)wi +ch1rom 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. Assumeqhgas3by gi1b j9tstq .;50c8: f0fhe the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is a8gae9shg bi s01 fj:cth5yq3;t.0 fqbpproaching 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 determinejsr)l2-mw 0oc the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of soun20o wrs- j)lcmd is 345 m/s. How fast is the object moving?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conical shock wave produced by a p-afwzt 56 o+fpry-*fsupersonic 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 1lhr1nh pl09sa3:cg2 oyp- w:b.4. What is the half-angle of the conical shock wave formeg pap9rcy-onb 2whsh1ll 0:: 3d?

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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 fr+ ;zxh9aqrwr4evis n:)3 iap /om the United States to Europe with a Mach number of 1.05 where the air temperatur+)z/nwav4 ex arh9 s:rip;iq3e is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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