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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://autodiscover.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://autodiscover.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 upxjbxz6o sxt6s1 6+mkg0* 5r 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 tb,cpu/c, 7ct4 ,cq7bttec /exhrough

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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 stee6pzqt74 -r 6qhxq8pasl rod?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature of the air increases, what happens to the,91y; te wvqir velocity of sound? (Assume that all other factors remain cov9eyrti1w ;q ,nstant.)

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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 sound, the velocity of+yz .xe :p(cwa-bpa-a a 200 Hz sound through aip:payac+a.bwz- (e -x r 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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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelength;;d2+ -evub spzjg qz; *t/lyk of a 400 Hz sound, the wavelength of a 200 Hz sound in air ;s dl2t gyp; -+u; kzqb/zje*vis

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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 2 cygzf0x9xl 1(yxbl(e)e c486r3h yec0,000 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 frequencyi st +xrv/5tq+ok+,a y 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 injd nlos:c(*:lnoh17 o all directions. If you move to a point twicnon 7*o:: jsld1h(cole as far away from the source, the frequency of the sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically divergit*+li k tv m* :3g*v9zxlvkk;dng 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 point source at a distance d frowgi1/xg )do+sm the source is I. What is the intensity at a distance 2dxg+g os/)i wd1 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 radiatin oqr+:j. hor0c3zsm c/01rjwxir.k4e g equally in all directions. What happens to the intensity of qikoz.rc3 0ocr:h4xm1 err.+j /js0w the sound? It reduces to

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source that is radiating equallyn;/yzh i f ;r-:*xyizt in all directions. What happens to f x/hzi-y*zt; ;i:rnythe 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 increwonix,gwxp j91q)3b c2um2 v/ ases 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 pg 5+dyh f4 uym slj*ob65+f;s:kw)xya speaker emitting a pure tone. What characteristic of the soundg;5ybwolmkpf +h s6:x)4y+u*sd 5f jy increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loud7n okvw9 )hgv2ness" 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 "pitch" og9:k9jtp1.b a1n b3) ocrceij f 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 into wa - hgh7/ ,e:khc2 zjjidnshomt2z1p6(ter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementkb +e5tz5szit*1y o03j zchl fiz h4qm+(2 rz5 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 guita6 zoe9f r(wdev-71m iwr string and the sound wave generated by the guitar as a result of this vibration. What do these two wavee7zvw fme96w(1 r- odis 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 botq -yor3 3zvo; mtw7-wqh 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 o * 7ezhtz ep3/hj8ffxr,j/ 0flength L. What are the wavelengths of the three lowest tones produced by /zf8e0ff ,jt h7jh 3poex*r/zthis 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. Which0mru p+ ;fiz:q dmn;6l one of the following frequencies will not resonate in tiu6 nmr+;zd:0p;m fqlhe 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 reson/ 1 3gey3usomk:1nhi-3f vp uzating at its fundamental frequency. Which statement is correct?zg/3u yopmuvfink3s1e 3:- h1

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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 clor.l.r(q 4m4 di *g(ma/arl)8 ceo zmbxsed 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 99pyp q 0wofw7d qosl9lg;h*+ lowest tones produced by this pi99pl; o+qq *f y gw7w9sh0lopdpe?

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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. W.06va1 o)z.ff)v 4d s tmhk/ta f1omqoaot i,5hich of the following frequencof m)6 kid4mvo q1ff.o.za1a,)5tht/astv0 o ies 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 enekz jcs 1leit9dury i4j,0,on4p9u2.d is resonating at its fundamental frequency. Which st4 juu2k. n9 9iicdsrjeo,le14 zypt0,atement 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 tx0p;v :ae9 cgqwo speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day whengpev9x;ac :q0 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 beaqt)j/s6 1 klxzb-p1ndts, 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 frequenca4k)i* zu0*8 cbgledry is heard. What happens to theb)*ac8dk4*i re 0ulgz 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 expfnjm9k 8qs01i)t h5wjlains

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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 heardd;c86i+ ir:tvt :uex(u x9 rcs by the observerccitvuiturx:xs 89 d +;e:6 (r 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 stationar 47*/zvdc fq7ojtw:z xy observer. The frequency heard by the obsxq:z/ 7j dvc *t7z4fowerver 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(vn7 yp(r nfd 2iymhomfr)7*; MACH-speed, its half-angle will decrease by a factor ; dpvfi 7y *m(72)rnnmy f(horof:

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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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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of an ultrasonic sound of frequency 45 kHz in air is 35f4n62o,ndtpd 3ppc s1 2 m/s. What is the aic3tdpfn142 p,d s6 nopr 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 so8b7.+ql g ko g cfzrosotx6):9und 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 emits a shriek whosa/vy1 n *bo spc806xeje echon*aveocyx 860 pj1sb / reaches it 0.0250 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 hw9+u()9tim qoy sh-ehp f3qy7 ear the echo 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 flash of lightning, the distan7ix amc 3h4as65uun:n pj1 k+ace to the lightning 6n +nmj 5417ush3kica: upxaastrike 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 daytgcjul e +ptf.)( jl2( 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. Ho(n l2vuz u3u0lym .pa*w deep is the well? (Ignore air resistance, and v( l .0lu a2u*pnzmuy3assume 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 frequencyi8e 3va t03e-a ct qqnz1 6:0hbkwkxc9 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 airjah 8 ; fo*8p6*hmweaw at $23 \; ^{\circ}C$ 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 level7wbg2xw4 ku p+ of a sound with intensity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity of m k8taylh4) nm:v.+ssx mi -b-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 do ri *ej u0pe2u,e6ea3d3 hzd4B and 40 d *,2ezji34 ua6r0hedpe d3uo eB?

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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 intensity 06 :yhbmxt7 hnlevel generate0ty bhn 76h:mxd 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 eq qtjjv:q/oz2 p2wpr*vl 2 zr4)ually in all direcpt/vr )2 r j24lvjz2wzpqo*q: tions 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 thatl cle-2tcrj0y3 8odig (fh t7; is radiating equally in all di(hfi;o0 t dytl c3jgce-7r 28lrections is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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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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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 assumed to v/p .xqxg,68rlq9 put be uniformly distributed in all directi8.qxpqu/ xg6pr, lt9 vons. What is the 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 dB at au0m 4wt.trqwj . j/yjli 562ze7)meeb distance 5.00 m from a barking dog. What would be th) 5/.j67ieuwzmett.j b4r2mlwyeq0je intensity 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 sound7mi--k.; otwnm z7ea c source the intensity level is 60 dB. What is the intensity level (ino;mwkai tc-z.emn -77 dB) at a 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 is q4heky q729xm95 dB. At what distance wiq7k24m hxq9ey ll 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 frejfy d; j375ohq mb0px0bjl- 0gquency of 1200 Hz. What is the fre00fyomj0 bg jbhx3-l7pd;q j5quency 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. k+ wwye9eg*vk0g/;z4 j gh9ucWhat is the length of thwzev4;g *uc9yg hgke wj0/9k+e 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 L l3j0*ww -b cefis 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length0 b*lwjcw-f3 e 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 1y5jm l ib41n)gx 4kc9w*tbzmwsw d56a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second hamgsnbw4i55 k6lz119yjmwd )c* x t4wbrmonic?

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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 wherf+6+wxknha (e7 a5 sbke 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 freque: tmj1cl+g7y) btg)sxyo v+) ancy in a pipe closed at one end is 330 Hz. What is the frequency of the third harmonic? oty7j ++xggay ))c)t lmvsb:1

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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 1 wey+ctbf:v0erku4 l : f9y nyz(d6f-pipe closed on one end that will have a fundamental frequency of 60 Hz on ayf09fyfcr +bknl: tuye(6: vw -z1e4 d 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 temperature-ge a0i9s1v upa*cjtf sq,*7o 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 iszaf4 yc7 lrzg:k993wz $20 \; ^{\circ}C$. 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 xj z+j x3(a*yzdei; -yis played when the speed of sound in air is 340 m/s. What is the fundamental fre+(ja-*xd jeyx;3zizy 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 ncn y7vlmmivvz3n2k*u: nl 9.*cn 3;fsame length: one is open and the other is closed on one end. If the fundamental frequency of the l9vivc: * k z7*n3vfyu 3m2.l;ncnmn nopen 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 800 Hz pucj4czn// 4dm4g/(u ( hpmfcin 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 tmhu/m c/npugfd/((4 j4 pc4cz he 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 same frequency of 500 Hz.*:lk5f zpg.gf g0dl/diq)t5h pe b;r+ If the distance from a person to one speaker is 5.qzdgd l0:pl5)g erfb f;k.+g*phti/500 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies of 440 Hz and 444 Hz. What il v61 36.b g-lypuw6akeu8mgqs 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 frequenceaj 7in7of mv,0 nwv(0y of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrumif o ,vajn(0vm7 wne07ent?

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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 anen v bic:gh 5-3sx(6evd 7 m respectively. What beat frequency is hev-gb5: vnec(6e hsx i3ard 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 violin strings on two violinswkk h: r/(es+c5 x/ixj in an orchestra 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 woh+s kc(re:5iwkx j/x/uld 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 1000-Hz sound sour em pw8mrt;de*z,p;;d ce at twice the speed of sounzw ;*; m;epr,pmet8ddd. 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 1000 Hz) approaches a stationary obsermg4+5xe *+pfnvsvuc :ver at one-half the speed of sound. Tm4+ fgsn x:uv 5v*pce+he observer hears a frequency of

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound has a frequency of 1000 Hz. If a listener moves with a speed 2 zi.9b, crrfpof 30 m/s away from the sourcrf2b .r9czp ,ie, 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 trav m*( fd)err2is3n/zzwjwa8j n*( pw8 eeling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches a8*zaz je/)(dni rew3*8m(wrf n 2 wpsjnd 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 stationary obse mxgka vo()3afjey2y::*ag /lrver when a train approaches with a speed of 30 m/s. The frequenf)aav* gxeym2 k3(/j ::alygocy of the 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 120fn-u2+h d m(;hp ci*bg km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s;d2u *mnhgf+h i pb(c-. 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 towar2:iiapk -/0zb2 m lea ku2u5amd a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frz2-u lauab k /m0iaeki:m522 pequency 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 16 + ug,ujai:txti4s oi+,xylwhistle. Take the speed of sound to be 340 m/s. What frequency do ys+ 614uyl+ , tjixouai:i,gtx ou 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 klip a-b5-hot0 8zeg 3you hear a tone of 400 Hz. Take the speeapb-e83ok z- 0tlg5hi d of sound to be 340 m/s. What is the actual frequency of the whistle?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a trainj -.5gd*dtxikz1 cgvks+,v o ; horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an obserk*o vgis t dg,+c;vz5-jd xk.1ver 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 34cgoh0n/ nf-m ;v7-(e lwo-l tr0 m/s. What is the frequency heard by an observer if the observer is approaching the tr -tog of-r ;-lvl/(nmhen07wcain 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 objecet );jpktbj1hi/hh 2/t. A 40-kHz signal is sent out, and a 42-kHz signal ) ;1pht 2htj/ hk/jebiis returned. Assume 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 wave produced by a supersonic aircraft is zx.;,0rnce7coceft(3 n d:w m$60^{\circ}$. 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 tz,0rikdc t i/9he half-angle of the conical shock wav,cdi zr/kt i90e 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 the Unitearism6;fl15zj-5knp.w 04 n5dk gg q md States to Europe with a Mach number of 1.05 where the air temperanwmkjfldgsp65a 5i q m1k -.z5 40n;rgture is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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