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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 statement?5, +lmwsdu mx-

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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 fastes 7o,yu04f /zwid 5yhskt 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 a steewk0wakl t75i;z5d2k ; bqadlr88j la6 l 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 thr 06fjosw /m9ke velocity of sound? (Assume that all other factok/mor 0wj s6f9rs 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, v/3barye:b-(qfatzs- h + v6ka 2u*lo )/wvxm the velocity of a 200 Hz sound through air isua:o af +(b)e-vm y kvtq/3-s*harlxv2/wzb6

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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 yzv2w zi :b+lr wo:e/d2k,xc+sound, the wavelength of a 200 Hz sound in air:cixvr:lwek2dz/z o by +w2,+ 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 are ca88 pit gfpy0j6i. i(ydlled

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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 fliw*g7 a r09qthan 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 dirlrhwe6*bh;f*(b w r;o5 0q, nujx ecx1ections. If you move to a point twice as far away from the source, the frequency of th6 rj*1 w,(n lh;ueb ; xh*0xo5wqerfbce 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 diver ylg0i)mxnb ag6g*:;m)o.ynh ging 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 from the source is vj r+rrb, l78fI. What is the intensity at ab+8f rl r,7rvj 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 radiating equally iclg8r)ixzdljfb,awr 7i 3o*, yn8 u; 7n all directions. What happens to the intensa3gl7nfcr ri,;8*u zo8,wljx)i ydb7 ity 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 distancfgd -x,dh2i l4nhe hf871p+fu:sq is *e from a sound source that is radiating equally in all directions. What happensni:2h-x+df14,h u8slfhi*qegsf7 p d to the intensity level of the sound? It drops by

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following increases as a sound becomes lou.jda - rj+cl9tya;:aeder?

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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 characteristic of k+ pft1ee t9 4nd:+m nljn3)q1ql d,nxtheedlen9t npnfl:ndq 1qjk 1+x,)+ tm43 sound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnen03z .s ;u.*kyxhc nmf1q8eb6sdvd d0 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 musical no )m+ff.ytoy) jte?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes fromehph 99exj zm /o(u85k air into water

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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 .h v f .a fwtgkw*c4cjk2)d5w7are

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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 soog *p-mt6kqm**w nln +und wave generated by the guitar as a result of n+nop6lq*-* * gm wmtkthis vibration. What do these two waves have in common?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is ayd tablm;wk. :3-+.;ua8t)9ib km meied1ro 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. What96yx 9h10qwdxuq 0qb t are the wavelengths of the three lowest tones produced 9 qtqh9w6x00x1 qud byby 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 200 Hz. Which *c ki:os:d :hzd-z2 nlone of the following fz:-n: is:k l*o d2dhzcrequencies 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 funerx:jv+67j w zdamental frequency. Which statement isr+jz6v: 7 wxej 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. +6hb+;b5 h6g ghlcjvn yn/gi 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 pip,4tx q mss1p dbd77fp5e of length L. What are the wavelengths of the three lowest tones produced by 7dpp,7x tfqmd b 5ss41this 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 clf2 mmss53bc+s fa3/ agosed pipe of length L is 200 Hz. Which of the foll3fsma2+ ga/ 3bm5s sfcowing 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 close*m*7za(tua wplx 82 dud at one end is resonating at its fundamental frequency. Which statemenpxzw*(8ta 7a2 d*umlut 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. hd2f0 fzzg /2ca1 .lv jeyh:rb2l/ nj)Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 332y n/0)bzhdf h.l1: f2veg jzr2ja cl/0 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 wavxc2.alhg0 1 d3(r8fdquuir 5 ies 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 nd *l9ckle 3//k 2tc )zddj/zn4j cdi:a particular beat frequency is heard. What happens to the beat frequency if the frequency of one lcl3n2dke zkj/d j/di9)dt c: c 4*/nzof 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 expl un1ah5:zlx+ +kx; 8lq1yzze zains

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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 observe- fd l.g hl(x ilm3fz31p68v.,tq xwfsr. The frequency heard by the obse3 g xf8. xw plsf(dm3.l 6i1,t-vhfzlqrver 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 stati+tsk.kbk u t /vlit9 140k)mk(x.qc myonary observer. The frequency heard by the observer u91v k/ktbk0ms kk+i4ytt qlx)m.. (cis

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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 decrease by )pf vt-9yf, vz: o2n-eqjvv2 sa fa)pnf -v,z tvjoe:s fy29v2v- qctor 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 ,g wx.u rfp/cj +1b2);ksbujh352 m/s. What is tc ;h/, 1jbx kgu2+bp).uswj frhe 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 of sound in air a w( xbl i.lnp ;unag88b13doynobu+7.t $0 \; ^{\circ}C$ 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 batgdq,:we5ccq9cij h8gl31w (*gl 9 jvz emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the sound?cih9 5jwl3gev z*1gdq98cglq w( c j:,

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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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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 echo1 9dh ;rg.rzgom)s;o1/ ;gotfah8shn 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 o:i c+ymd 9+dilf lightning, the distance to the lightning strikel cdy 9im+i:+d 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 dayiufkmmm(:vsg wv* a6 ,s*/xqtk4r;n* 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 intowi92lp5 ct9bptrqcr -ws(v u;9*)i ir a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resisrtr;95wibir vu2tip q(-cpl ) scw* 99tance, 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 wav5q i)h f4msv)oe of frequency 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 y r4rf)t06zjsat $23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity level of a sound with i3rrz gp87)knkntensity $10^{-3} \; W/m^{2}$?

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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-dgm (8;sch kh / opyw/nzp4xn)7B 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 intensitijuxd 1ue1m45kaa 36g oes of two sounds with intensity levels of 70 dB1 1aeu6jx4d5oa3 km ug and 40 dB?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines in a garage is 100 dBr z7z1q.jq3dkjl q5u50k t wd8. What is the intensity level generated by 0z7 k5djrtlquwd1z5q 8.k3jq 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 d3nn8pqjl37 cix6uu*9u /vfq-uib*w of 6.0 m from a source that is radiating equally in all di f 3i *nw9 dvupuc6lq*u3n7/ux8-biq jrections 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 radiating(x rqxdqa3(d.; xl dy5 equally in ad r.5( dxxxaq(yq 3dl;ll 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 delivers about 1 mW of power, which is assumed to be u)f3m;9jy s4i7ojp gpbmr* f; kniformly distributed in 3fkpjbg f 4*o;y pj 7)imms;9rall directions. 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 9xvkyw 3p/s h/:n52ujovuo ,n (2 uofzdB at a distance 5.00 m from a barking dog. What would be the intensity level if two 2uwou2uxhpfj :(kvn z3y,no9v /s/ o5identical 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 6twr+pow-l9l x8(5 xhora24i o0 dB. What is the intensity level (in dB) at a point 2.0 m from toxwa-xol2 l(rht58 i wo+9p 4rhe 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 a9aeux1 u*g5 a n3mewv7 point source is 95 dB. At what distance will it be 75 dBu3 nv guwmxa9e5a71*e?

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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 compf 53 dkckwbz7dutiw1*g*i 4c2lex tone has a frequency of 1200 Hz. What is the freqi * itzc 7b3u2d*wf5dgc1k4wkuency 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 thsel(7 six0teo:ugy yeb*8gn/ uh+2w; ird harmonic of an open pipe is 900 Hz. What is the length of teunsytluo:7y0b+8hixwg;gs ee2/* (he 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 isyj4* 3hyol g.tz sec,6 2mlj,u 400 Hz. What is the frequency of the lowest tone that will re,gy2tch*jmj,elsl u 64zo.y3 sonate 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 eao4htsnse:t0,2b g ;jnds has a length of 0.80 m. If the velocity of sound in air t; 2, s0:ah gs4etobnjis 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 te(kpl.wcx 6 lq8mperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequency in a pipe closed at one ej knqacrh;w,s+-8 zv3k6 6rjnnd is 330 Hz. What is the frequency of the third harmoni8ajjkncrq6, r+6z 3kh w snv;-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 shortest pipe closed on one end that 3j2kwzcsw*4.lj* t1 ;ot guakwill have a fundamental frequency of 60 Hz on a day when the velocity ofz2g ;4.scoj u3kw* t lka1tjw* 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 temgy c,,uy3: hwwm xp2q um8w86eperature 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 is-0 u7xagsqzrdysw+75 $20 \; ^{\circ}C$. 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 pla9dlxu r4xz, +myed when the speed of sound in air is 340 m/s. What is thex x+lzd,49 rum 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: one is no0 w zsm)l*a ld:n)7vgn f)2iopen and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the funda7lodm ninwg:v2*)a0f ) )sln zmental 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 m 2cgtw13o*r zwhere the velocity of sound is 340 m/s. How much farthmt1 z w*o2rc3ger back would source 1 have 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 ba o1f i/(cz-*el cujl2y the same frequency of 500 Hz. If the distance from a /ue(2*zfo c lc-j1laiperson to one speaker is 5.00 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 is the be 8,d/b)xw npi9ly tc:pat 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 vt(b 4hlg.v8j9n hvl8to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the 8 9.bg 4vjvl8tl(nhv hinstrument?

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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:yi:i g zre5ld(+ sy(j/f7sd x m respectively. What beat frequency is heard:i (i7gsfd5l/(sd:re zjx+yy 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 5r.w fdf.3mkeorchestra are found to produce a 35emwk. f.drfbeat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings would bring them to the 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 10:k ukq z19.(1epdvskj:krbe9 00-Hz sound source at twice the speed of sound. The observer hears k ek: upsk1. qz9(:9bjrdk1v ea frequency of

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequency of 1000 Hz) approaches a stbj n/v spr102 o -me1sq.cebe9xo:/baationary observer at e90/qo1orp ejbs v m:2cxbn-e./s b1aone-half the speed of sound. 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 frequencjtlw j4t;a;yzy ;bfr*(7zk w qv,w3u7y of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard ;uftwz l 3z j wyt;4j v7y7*r(kabwq;,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 8jgu pmm4u09vq3-j mc traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standinqmu4j c3vu m0j9-mpg 8g 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 appihb,i+ w w*3ov7 j4dch5)v 8;imm zyjlroaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of s )wmmzh74jwdh+ij,li8c ;i3vby*5 ovound 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 km/h. The train blows ifcx376l fe vcdu70qsw e86d6 wts 400-Hz whistle. Take tv63x8 ql0 fwuced7 dw67sfc 6ehe 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 its 400-H htr39y;rr m xkacx ;c.d7rpj+gf0h+0 z whistle. Take+fr0 90jc+grdtx a.xhrhkr py;c7m 3; the speed 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 traveling away from you x0u ;2*xyn1fbf1 kb 64vuspdgat 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whau pu61f12 vdybg xk bx4fs*;0nt 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 + r, uj9hp8tzvim.x3/ ew:wiz 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take i83wv.xmrz z 9wj:p+tuh i/e,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 500 Hz. Assum+nh*s:s yt, pfe the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a sppnf t s:,ys+*heed 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 fseh ,+le c(+7e*b3bqq0 ull:tkd) zespeed of sound in air is 340 m/s. What is the frequency heard by al(et 7ee3z c s*lu:kdb +h 0b),qfl+qen 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-kHz signal iwe f1i4zd54w)w-axa p7gr0ees sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast z ei 47 ax5g rap)edwf0e-w14wis 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 supersonz*9l ycf4txpf ht6x2+ic 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 thc7jc+ w t4gdiw*og (t3e half-angle of the conical shock wave form 34wtwc oit7c dg(*gj+ed?

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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 to Europe witkh g/7ys8qig+6ddy s2h a Mach number of 1.05 whersy d2qs6k7gdy8+g /ihe the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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