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习题练习：Physics Unit12: Sound
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 70，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.5edu.win/test70.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: admin  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is a false statez( v 3v:5o pfi*xdnk xaz0n7j9ment?

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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 fastesto*91b5ii mt v,w*-glzlcyz uw7.s a:s 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 t7ugu230s- 9bjr:ei0srg dji 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 happens to the velocity of sound? vi:9tqn n45wl (Assume that alll4wq 9:i ntnv5 other factors 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 vpe 999cg2tg*kt4 gkm of a 400 Hz sound, the velocity of a 200 Hz sound througgktg kcgm9 t42*9vep9 h 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, y7ybpz m(70zn the wavelength of a 200 Hz sound in p7yzb ( nmzy70air 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 +65b/aj*e ur wyb0it-sxg0 ql20,000 Hz are called

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequency less than 20 Hz are called:fwar99tobha.qml +uc /z91 ayj /1e g

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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 wa)zl z mc xsc.9ge.y4:uvqh 05hves uniformly in all directions. If you move to a point twice as far away from the source, the frequency :uycv. xshhm5zec9qg z4 l 0.)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,w isz :f vwzwqmt8.pfi q1*1421s dcn- 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 from thnusw 8nj - w-h6v3 wuk8,dr6is(*vinwe source is I. What is the intensity at a distance 2d from the sourc (*sw8dwhs3urinv6 k ,ju86ni-v n ww-e?

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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 radiatingzx drz5uv11cr7 b+-l s equally in all directions. What happens to th-vlcsb 5u1zrz d+x7r 1e intensity of the sound? It reduces to

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source that is radiating equfw (* rlc8i;ugm )+nnbally in all directions. What happens to l8*im;(w fbun+nrcg) 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 sr3-vd /9xr flgs tox:4ound 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 emitfspdmo5 04to 3ting a pure tone. What characteristic of the sound in45ot psm d0fo3creases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudne2( 4vatknl5z72 jtpdo ss" 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" of a musical2,e2)34f2mool1 vqsqg uutf n 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 wx;qiz 3r4 ts3yater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves ar gwxobcnt/,8 /e

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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 gene.iqa+ j* vkbbkqu389w rated by the guitar as a result of this vibration. What do these two wavu8bw .q k*jq3v+bika9es 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 both e (r*xsmlo rl*8nds, 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. Whj)em wa (t z3)fhk8sv:at are the wavelengths of the three lowest tones produced kje:sz(t h3 fvw8m)a)by this pipe?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of length L is 200x3(,nnoz tj*6ou p/fv Hz. Which one of *j u,36t/nvxf zpono (the following 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 its fundamw2nba8l +xe/f 2 xvz5mental frequency. Which statemen5 zla8 2nb2wv/e+xxmf t is 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 whichzp-y,r;d vc dx0 xkryp f,a.(8 is open 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 l8zflow( -n8wrhc) w 1gowest tones produced by this pi8 hn1-owzw )cwlr(g f8pe?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in a closed pipe of length L is 200 Hz. Which ofpq:xc w9qis+9 the following frequencies will not reso99p iwq+sxqc :nate in that pipe?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pipe of length L closed at one end is resonating at its fundamental freq1 m qelwp.oknt:+b3i 5uency. Which statem 351onptel. q:wi m+kbent is correct?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands between two speakers drbs0(tv.sm 8 ptiven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the s0 b8(mtvpss .tpeed of sound is 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats, the two sound s3cg.e npu+a fwq(7 ld+f2- l9cr 3osiwaves 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 particulw:vz -lytb0ezx7 z5qv8lk:x7ar beat frequency is heard. What hzz0xb:vt7l-vlx qy:k 5w 7ze8appens 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 expc 0it: b:a (- hrz;wn*r/-xa1eqheriplains

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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 stationarsh6 xdsfp;*6)c1i dj ty observer. The frequency heard by the obsd)fc 6* ssdp1ith;6xj erver 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 deparc g3hbg:7qnu o4)f2c ots from a stationary observer. The frequency heard by the observer in gg 4)f2 q:chco37uobs

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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 decreasex, llq(ebut c*t prh*u 23+(ej by a factu hrtteu2e ll**xcjp+,q3 (b(or 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 soy- 3)xw fwd: ulqy a./4,*me)uxjk-pyuegr w:und of frequency 45 kHz in air is 352 m/s. What is the air teawmxuuk3ed -, )x )*::pey4 ug rywj.lf-/ywqmperature?

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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 inflruyt5 5r k+q) sj))u2w mo/d 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 ,(lko2 nrv)zj7ylm )dz n,l1v air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was thel j1z,zyn) k(v7 ), lovmrl2dn 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 4.40gyb z2v o/5py3: omvb byc/34zclew00 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 distance vcyy7)4t2 guw:ny24; k mbyyqto the lightninnk ;2u4t4ybwc:m2yy ygv7 )yqg strike 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 uw pq kti55rijtbnl*yk(: eg.+ 1a*x;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. Ho*av: 4 nqjdqnsac/u qdm 04d(9w deep is the well? (Ignore air resistance, and assume the velocity of /dv a:q n*9 (4cmq0n4daujsdqsound is 340 m/s.)

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 50 3s 2y7aaq4ypo h p*y +lg+jww)4tcqv00 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 agbwc9p+aa;gxqi1/6 nir 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 level of a sound 8n(pfb-z5yphth4 p:2zmx7y o 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 apm-sfj n wh3( y- yq2:;mk6jnp cx1(bo 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 t:mm8w 8 jbv8e8dh-ytzhe intensities of two sounds with intensity levels of 70 dB and 40 dB?em h 8wd-t88b8jmvz y:

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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(-m mr if 0+tn;9fhvim in a garage is 100 dB. What is the intensity lefm;m(mirihnvt 90+ f- vel 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 frpuo hl/njq6r/l3*9m bom a source that is radiating equally in all d b//*l9rjh3lu p 6qomnirections 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 sou9i g yws4th5-mrce that is radiating equally in m9tsi4w5g -yhall directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog deliversz hqn oel3ds1adckj.3 g 9c)9;..td gb about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5 do9lsczj)9 gabt1dkh. d. g ne3.;qc3.00 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 dva-sqie5mv: j3i.dmv r5( 8km from a barking dog. What would be the intensity level if two identical dogs very close to each other are barkve 8smikriqvd53a5-d:vm j( .ing?

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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 avl b e /*x2 wpe,z 6u8bfojqw:d3);hda sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radia q6bd b8xw:v) ja;fw *2p3 hou/dlz,eetes 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 5.00 ht:fem2099o5 su.icqax gfq m from a point source is 95 dB. At what distance will it be 75 dfmgsa0u:fc q92e q0 i5o.t h9xB?

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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 complejaz;t9g jf, zmz-9oc8 x tone has a frequency of 1200 Hz. What is the frctzamj -z, ;89zj9gfo equency 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 900ze+ ,itm 1v ci,+tj;j7cwr3 wd Hz. What is the length of the pipe1tczv7remw+jijd i3t ,;,+wc?

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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. What is tm0-w eqh/hkq45/c a qshe frequency of the lowest tone that4wm e0-5q/hk qscaqh/ 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 lhgl 5d(x.fu 7hength of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the secondx(h l.u dghf75 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 wheregf)gr0i*sq .zqt)f2 w +qn5 4bk5pb dd 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 frequencf achu)5-3c3l4:w3s, .ghdd wdgtuzs y in a pipe closed at one end is 330 Hz. What is the frequency of the thirdhz ,c:g53d w-chlust .4w3ad gd3fu)s 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 ;n0ee 1g o;u3o9fjsyo one end that will have a fundamental frequency of 60 Hz on a dayosj 3y;g; ufo09en1eo 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 isr+f b;fu4zk3, * +i-kqadsaen a room 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 in a room where the temperaturei* zm1ddk.3z-inan( zr 8d0j k 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 leng g( 3qll6sbw*cth 0.75 m is played when the speed of sound in air is 3wg3b (lqcl*s 640 m/s. What is the fundamental frequency?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes of the same length: r4rgoi4y w6 7tone is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundam4w ogt7r4riy6ental 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 in air wb nmem9 )- cxd cpt .):)u(pdxjmy 5ka8tq7df/here 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 n)p ydcmc-dkej p x/5 . dtnu:)7 f()m9btaxq8mo 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 o2 dfs0..vfmupf 500 Hz. If the distance from a person to one speaker is 5.00 m and the peru df.vf.ps02 mson 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 a--xfhc u: ozu8nd 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 t 1pyghn (*aya0vf19njk.kc k *une the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of thnh *1npy*9ka.0v1y( fk kcagje 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 m respecti j k;c*7hfecz7vely. What beat fc7e *zkc7h;fjrequency is heard 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 violins in an orchestra are found to vnye 8nr j32v9produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in thy89j nv2rve 3ne tension of one of the strings would bring them to the same frequency?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationary 1000-Hz soun: ,qeotvb;f(/l twqk+9jk k(i d source at twice the speed of sound. The observer hears a frequency ofkwqbfoj/tt;vi kl:k, ( e +9(q

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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 2+mkj(gm as0f) 6xm2cojdtmq hbi49s ky3e--frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequen3m4ehgaj6k ic-t2ysj fxmob +0 2md(m9ks-) q cy 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 saso0f6s(9 l i 88o:iwjny/5 .g kvchekpeed of 30 m/s away s(85lhieysogvickwj o 9n 68f. a0 :k/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*lf3si e*lleijk;25y le4x n: at 35 m/s on a day when the speed of sound through air is 343fji lnkx2l eyl:*si4l*e 5e;0 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 stationary observer when a train ap 5sde25 he1tvtproaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/5 eh52tt esd1vs.

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward you at 120 km/h. The t ;f084fmiftaf9 8h,qybor2j vn gk e,4rain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. 482nm,4etiokr f;a fv,q 8 f0 9fgbjyh 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 towmmm7u;e :f1 n8e2h kvyard a stationary train. The train blows its 400-Hz whistle. Take the spe 27ue 1nv8;eym fmk:mhed of sound to 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 traveling4esrk0sa20 nc0pohfu)l /w m7 away from you at 120 km/h. The train blows its 400-Hz whistle. Take thkla2nf/e0 70 ms 4oprwsu)c0 he speed of sound to be 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 whistlc9sn:nxbi2/4s1 om k qe, and you hear ssbxnon 29k:/q14ci m a tone of 400 Hz. Take the speed 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 train horn is 5s l:tutt,k-3 v9pig5v00 Hz. Assume the speed of sound in air is 340 m/s. What is the fre,:gvti -klv3 pt 59tsuquency 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 train horn is 500 Hz. Assume the speed of sound iv4; 9d,3yl+qsllx8-tj fbcfc n air is 340 m/s. What is the frequen 4ffb td9csv+l ;-llqxy83 j,ccy 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 speed of an object. A 40-ml k:+-k4p)d ptkqy f(kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound)k(t+qky:l k m-pdp4f 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 conicaln:8uo4g xqfu. - )fbgk 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. W2),c4) ddy 1 tktdgfs-ngj6; + qkzgoahat is the half-angle of the conical shock wave 24 gqoay+); ggk nt6- s)1dtdzfcjk,dformed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the United States t n+l;xzjwb -q/o Europe with a Mach number of 1.05 where the air temperaturel zb+-wq/;nxj is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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