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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  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 ish lc,w .bm;w33tmpo7)b9nwi y3 wz:8wzxss ,b 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 faste; r:0, csv nv/jjafmkis;ez+9st through

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of sound in an3d6aco k-o() rdq0vj 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 iy3x:j yom:r0happens to the velocity of sound? (Assume that all other factors03:yr: omxjiy 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 so /, s0sbl zlcqat)1hl,4py7wsund throus1bla0s/ l),s, py4ztlwc7q hgh 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 Hz sound, the 65njmzy4r thw(kp4 l 9qo3ey- wavelength of a 200 Hz sound in air (em 3jrt4qokyn45y h9- zpl6w 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 frequencies greater than 20,000 Hz mxbg8fx z,37 )nu;; ng5vyd/ lzo ,rzxare 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 calla.hk miz8.xc .ed

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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 direct4y k q6 +f4*g uy0xdpm63. f-dp:opa dszsco-bions. If you move to a point twice as far away from the source, the frequencyss-f 0* .p :po3d 4gf bacodzu+-p4yxm6dkyq 6 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,7gqy+y3d7h. /htntk2or gff, 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 atde*x2-0hjjdh a distance d from the source is I. What is the inten* jhj2 hed0dx-sity 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 radiatojiqxp99p9mr5. t,rjing equally in all directions. What happens to tpj 9m,5jp .xt9i rqr9ohe 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 distan0co;dj ekmgn.+,jf0m ce from a sound source that is radiating equally in all directions. What happens to the intensity level of the soung+jc 00,m.;d kfo emjnd? 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 souzn4nwvsf, s, q)s)lm 0nd 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 emittingw2 k c w qrs;k6fd4lulru.y87* u*al4v a pure tone. What characteristic of the sound increas 2ua.lrkdy4c*;uv7rk l uwsf*6wq8l4es?

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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 note?pi7e k7oy8 k6o pap8c2

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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 m)z 83zx/ osfuud b4gf2usical 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 int3q:a h qmidpsma(00,co water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displace oci;b;,k)*ufpxo ny/ yq .lg-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 w e69t;c rh5mhms: qgo3ave on a guitar string and the sound wave generated by the guitar as a result of this vibration. What mqrsgh6:5 o;ehtc93 mdo 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 wd)/elcqa*2mzn9*zd o / dt :yrhich is open at both ends, there

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本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
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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 l-r/fw.jo7a v i)zqen wb8z)v 7ength L. What are the wavelengths of the three lowest to)8ba7 7.qj /o)erwf wzvnz- vines 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 lengtht8,nyax6pa o6 L is 200 Hz. Which one of the ,8pxao 6 yt6anfollowing 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 resonating at ro3k8qkdhw: 03 /vcywits fundamental frequency. Which statement is vwk :q3yhk /or380 wdccorrect?

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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 dpl s6r(a:/sxr +oc z9closed 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 wavelo)nhnvgc f ,75bp9fkp+ / :s+y-uynehengths of the three lowest tones producuvcs/ehf gnnnf 7+h:yyb)o,9+kp p-5ed 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 i8u+wgczl 9*covf8 f0 fn a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that8ffcc+zl9 *v wfgo 8u0 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 fund)-)l ah-hpghclr8 hv)amental frequency. Whichr hlvl)h8g-cpha- h )) statement 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 speakers driven by the same source. ; g6jxc3uo8vl Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/su3;8xl jvg o6c. 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, the two sound waves should h nbhyk kve*m .kp)o(9t a5;g(tave

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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 togethoo( u)g+ ym*vx hhfj8-er and a particular beat frequency is heard. What happens to the beat frequency if the frequencyjxuo(*m-8ofhg vh +)y 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 explainy+ fz*h j (puj;egz(*xs

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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. m 3h j)7iah/xe-t vv0k The frequency heard by the observer isv7e /ajtxhmk3h- 0i)v

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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 ehr(tfky, nz70 -i8fg*9r fmlyv.*vs stationary observer. The frequency heard by the oy .zy m he l(t vf80kff7rng,i-9*sr*vbserver 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 ittlc/f r:s8aq3 s MACH-speed, its half-angle will decrease by a factt/fs:lqa 38 rcor 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 in air is 3 rjj4c9ji70wrs:,r h a52 m/s. What is t:r7rc4j0wha j 9irs,jhe air temperature?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the speed odi2 b.0,jv7zjw hh 8f /u)szsmfkl+ k/f 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 340cwbpx3 6jm. ejm8uq6j3:aat8i l :s8y m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected bax t:3qpm.c 8m i8j6ewuaj36a: lyj8 bsck 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 1*; kqgzf o-u:0:f nqv kkfobf i9ci 53pv-y*ktemperature 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 sg31aqcb5lpxwwt 3+;) s9fave eeing a flash of lightning, the distance to the lightning strika ) e 3x93bl q+v;5sgtw1capfwe 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 fro:- .mbkj:oky,psdh mkt . 3zw.m a cliff 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 splashvl f.: 6e3jipb 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocityf3bjv: 6li ep. of sound is 340 m/s.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air of a sound wave of frequency 5 m5;2j w(f;xr bj+w8gqfchtg. 00 Hz is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in ab d kk2:z3,mef*b- aclir 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 intensity3*yv,d ym+ t +5xvsjjh level 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 o 52mlzqxo7h/uydx (c ,v sia5*f 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 intens; +9nhoh: l36pt- m/ofqnfpnbity levels of 70 dB and 40 dB96q3nftp/h nmfob-p+ l:oh;n ?

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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 i1/9zbrgtp brkh/a yy0k1;; lrs the intensity level generated by one enginer0r b/1/ylrb hkztap;y ;g1k9?

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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 radx.g yr f.r.5luiating equally in all directiou5rr lg.x.y. fns 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 disit ky;i49,xrw(7 ik ubtance of 6.0 m from a source that is radiating equally in all direy;b(94 t rxiii7w ,kkuctions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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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 be uniynodkfzg9 (q gm7u2a9p*j 57 cformly distributed in all directions. What is the intensd(pfja5y*2g nkmogc q9z79 u7 ity 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 distance 5.00 m from a bar r :)iv8g0g7ko seoj7ehn2bqzh3int d.h-1y/king dog. What would be the intenn:e).n7ghh 10gysi kq3htdzo 2/8b r7j-iove sity level if two identical dogs very close to each other are barking?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m from a sound source the intensity level is 60 d-jaz ;cmgyr;zh/dkleb 3842v B. What is the intensity level (in dBv/bg zremldz-k 24;ay j c83h;) 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 l/pl; qx8 oksfyap; b,4evel 5.0 m from a point source is 95 dB. At what distance wi;qyk4a x bflp8/; sop,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 frequency of 12r tlu,/y38i:ocbr bg:00 Hz. What is the frequeo8t ci:gb b3/uyr,:rl ncy of the fourth harmonic?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonic of an open pipe is 900 Hz. What is thet y7al+tu8 ,5s5cye0ish kf +b length of thyci0bf le + h5 5tky,stsau78+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 is 400 Hz. Whats9zlx. /) ,h gd8fkcba is the frequency of the lowest tone )g,caf h8 9klx.dzb/s that will resonate in an open pipe of length 2L?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An organ pipe open at both ends has a length of 0.8p *)8e;dzq6 gx8jx h8zcz.o ge0 m. If the velocity of sound in air is gzeqo*8c )8xhj e. z8 6dgxzp;340 m/s, what is the frequency of the second harmonic?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the temperature is njz.k/w 4,a*r jrv 7 q81 tfvycgje 5aw0(,csi$20 \; ^{\circ}C$. 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 atqdm0n+d cl416a-av pv one end is 330 Hz. What is the frequency of thec4 dnlvam1 a+0-qpvd6 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 thjk3- wp 5a.tmlat will have a fundamental frequency of 60 Hz on a day when the velocitp3- jmt. kal5wy 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 td)/cv wxu24 dg:+sex voca -/2ot2dkzemperature 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 wh3rv;yft,t t54xcm hehw pk.7c0/-sfu ere 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 :hnxb5lu3g bm;rx;+ dwhen the speed of sound in air is 340 m/s. What is the fundamental fdrb+;gh 3;lbu n:xxm5 requency?

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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 opd bovil.-47nwbdv 2j7en and the other is closed on one end. If the fundamental frequency ofi bnd7bod7.vwl j42-v 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 of0h)td4nbm;8: beobs2: boi)lru wt -z 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 observer in front of the sources would hear no bb:4t;bz:uo 8itme o )20-rbsldwh)nsound?

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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, ypwgsvl4b(2rpmn: , 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 owp bn2spv,rl g,4m(:yf 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. W9 c8d2ofxuo ,ohat 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 tun+/+osu9x;tosbe 2; m4khuxz ae the frequency of a musical instrumexo t9u a;+e o+xh4zkmb 2s/u;snt. If the tuner 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 horns are 6 m and bdl 73pn1oa cmi4()l3mroix87 m respectively. What beat frequency is heard when the horns are84mmal3ibp37ldo(o cr i n x)1 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 strinx24,kiyc3 3 +2wxbhga3wq oguj z41b zqej21 pgs on two violins 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 ofco,z23uaq z21j +p3whw2xkbgg3e4y4x jqi1b 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 approach91f6au:qwl . f2s4apb3jnmnr :n+sg cw +)w uzes a stationary 1000-Hz sound source at twice the speed of sound.:j1a: w3ws6nn 9afw2 gzu)npmurbf +4+.csl q 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 owa;2m:f-gu/ vwrz we1bserver at one-half the speed of sound. The obs- 1z:g u2e/wf;vmwwr aerver 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 liswx vu3.b.1g1j+ ilckwf l, +hktener moves with a speed of 30 m/s awafc.lk3+ 1+1hw .uiwgxjlkbv,y 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 is traveling at 35 m/snq/0q7h1y;*ikimm flqj8 hhin4 oh*, on a day when the speed of sound through air is 340 m/s. The cifnj i*0kqiq,hl;myh*q8n 174 h m ho/ar 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 hec y .d6wgkukr44evqiv0b/k6 4ard by a stationary observer when a train approaches with a speed of 30 m/s. The frb vwqiyr4.kk ke/4 4c0udg 6v6equency 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 1203w i87u*gzzji ok4 8vy km/h. The train blows its 400-Hz whistle. Take the spevyzi8kzu7i 3g4w8 *oj ed 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 its 400l83p n 5y3 w7tzcg,u58fdwkbm-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?3lnfmd,5gbzyc5 kw7w3 8 8ptu

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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. xx5tz p*(.mclk/w4*bx a mhz ,rcsve6 )9hjs8 The train blows its 400-Hz whistle. Take the speed of sound to be58he*sx.ch9tmcv6p b)z x 4w(a m/ x*klj,rzs 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 f/egic7) xn84nbp y9rz) ahsp06ma w,you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed e06 /wx hmnf9 )pp8,7bcynga4 azsi)rof 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 train horn is 500 Hz. p+ wox0x+t ah+Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the + +wah0o+xtp xobserver 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 5tr c+o*t:tx1g.4gx u d00 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observt*c +.4:otx xdrgt1u ger 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 g jj)qbnp () j,kwf:q.the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume w,b.f jgqj)jk:pqn ()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 pdtoyh( 9b w:)050c /vj*ha8bkkjfjasupersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet flies at a speed of Mach 1.4. What is the half-angle of the conical shock 2:rw*ak)ywz k w: arywkz w*k2)ave 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 teitb,v.. d, fq.7pb0i d:xua yhe United States to Europe with a Mach number of 1.05 where the air temperatup ,vtii:7dd q. a.xfb.0 yeb,ure is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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