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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 p.bco7i2mwjtj2*7zm is 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 througyws 47kq(yd(yh

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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 4hsue5cfwo2 f9gtl ;4in 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 jl7y0w 2gcto oa9b0hc*zzx)* qg f21qthe air increases, what happens to the velocity of sound? (Assume that all other factors remain constant gbg 7ytqowc 2 0*ax1z20*oq9)zjhfc l.)

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz sound throu/lhb pwscm)) s.t:dj7gh cw.tjl)ms)d h:7 /bsp 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 sor04yq+*su xlddl3suk3zi7 0lund, the wavelength of a 200 Hz sound in4iq+d30d 70ukysz*su xlr3 ll air 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 freqy,t*mrxvf(kguw c+(7 uencies greater than 20,000 Hz are called

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequency less than 20 Hz igad eyeu.ms5c 8,/s :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 unifo cg+tjn o0n-- g);hrqfrmly in all directions. If you move to a point twice as far away from the source, the frequency of the soundnjr) hfn-g;qtg c0- +o 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, intensity is proportionaq+z ogy ;fujo;4 3bg:ul 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 I. Whic*uz(v)qhxgr4v z:/ qj83o rat is the intensity at a distance 2j8 io 4)quvh:cqzgz*( rxrv/ 3d 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 equall/uaeiy 7bd/v-wn1z 0w y in all directions.d b//7iwav -zey0 nw1u What happens to the 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 vs(bv7w;*0e9rk p,zc,l vnug is radiating equally in all directions. What happens to the intensity level of tesvvz7(v *,rb nkul 0p ,wc;9ghe 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 louuyke 94igw);cr3ag cn36)l q5bka r;y ox)au:der?

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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 speaker3p6g zr+j 3ehu(mzb -xea5hza g:vu), emitting a pure tone. What characteristic of the s(e5hh+zz: u xem-u3,jbgz3gv)a pa6 round increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness"c1av+c .rhi*8 bukb0kdra.z 9 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 mus yhre3yy :sd41ical 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 fr)ji,2xk iwog3bjv+2nd9sg:-vs b mog8f2m,hom 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 displacem)kt6m+z haluu, c7(wiz +ho/ vent 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 guitar string and the sound wazf;q (hpcueyo(he6b+yc,: y8syw z*1 ve generated by the guitar as a result of this vibration. What do these two waves have in common?( y1yfy h ey6;*peuqh s c+:bwco(z,z8

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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 isgvew; xhe6iapk1 /x m/kq,6.w ih s1l+ 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. Whathbc-x -f2(xkn*)l v (dfo(qk w are the wavelengths of the three lowest tof(bvxfk2 kqn )-( -lch dw(*xones 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 pic/ r99yvlqy bvo:b+ll g9:f5 ipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the si:blgl lo5yf 9+99r q b/ycvv:ame pipe?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An open pipe of length L is resonating at its fundamental fcwapp3n.(kc-4uj l /ya n.(bqrequency. Which statement iac ljpbq/y(4 n(.np.wca k 3u-s correct?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at one end and closed at t30kun1d*dmt nw(w a fsn)r:8the 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 lowen,1phr qf l:f51wdec: st tones p hf11::dp,l w5cqenr froduced by this pipe?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in a closed pipe of length L is 200 Hz.co ,n)96ldn zcrm(7 mle30bmw Which of the following frequencies w,ne(ncw6d mb0lmr 9 7c ml)zo3ill not resonate in that pipe?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pipe of length L closed at one end u sucvdhl.82h 4;,zp 69q rg)s+ kgkqfis resonating at its fundamental frequency. Whicp4z2; rquh. l hqfsg89d , +gv)ukcks6h 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 betwe2; .9d a bshspsjl,5vyen two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the ssybj2.; sl a ,5h9psdvpeed 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 wals78n e yrd+0ives should have

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded together and a particular beat frequency is ho+ z/g+obbh /feard. What happens to the beat frequency if the frequency of one ogoh+ + bbf//zof 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 exczgk01 )w8wn opod a e(tzx3b0sem-,.plains

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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 stationaryo71dg vtkn7 l7wedpwn z ,c,r+*u,(ym observer. The frequency heard by the observer i+ct ,,w77 ypm,edv7wgdlno*1(kr nzus

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationary observer. The frequency heard q,h tef 5gy /+99df lern0oszv-2-mdm*b(nou by the observer omzn- ,l/9dd nh0b(+5ffuto2 y *esmqeg-9 rvis

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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 wil2: svcf:r5muz 1b 1ecvl decrease by a facto:e:1f1crszc 2v u bmv5r 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 352 m/s. ;7dwauysy. r) What is the air temperature?7 a;ud). sywry

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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 spee4 9vkfd 8i53;qxvgu usd of 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 340 m/s, zagzyv c+6hrdpkjm:is qfjf +z+,1 q6(2-* zna bat emits a shriek whose echo reaches i kgq h,(mz-yd:z f1*j zn+jc66i2+vsprzf+aqt 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 hear the echo in 4.00 s. The temperaturq.+0anqxu- o fe 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, thy7,sqr5nn wds .q) jy;/n:ykne distance to the lij. synry)5n;,kn7/qywn:d sq ghtning 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 s4 zgi r 1ehcm6yac.w;k0t7pi, from 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 splash 2.5 s, o0 wod j)7dxb1jtvd/ later. How deep is the well? (Ignore air resistance, and assume the velocity of soun vb)xtj o7w, 0jdd1d/od 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 jsj c7g,-eh tvw -th37sound wave 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 at 23 f+6mmnl dll+op lj/$23 \; ^{\circ}C$ 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 ckopiuv/*z5ta * 7d ,xlevel 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 a u,f 3unyvzd:/0ychk3yum 0a 770-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 soun o6srif6z8sg k1yej(9tc2,w ryv8 jtq96sod+ds with intensity levels of 70 dB a1o2yv6sdy rwjrt6s foc(89qzgi,jk +e689 tsnd 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 bvjm; * bm5f7gby 15 engines in a garage is 100 dB. What is the intensity level generated * j;f7bmv5 bgmby 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 tz9cra6 .xuhiv2udu mqol26 5:hat is radiating equally in all directxcruou5h:maludv26q 2 i z 9.6ions 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 cb gtd6i+7qvbnp7 u.l+ru; o;from a source that is radiating equally in all direoginv r .qb6td7+;ul7pu +c; bctions 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*c*h:hk - sjf:yf h:anfgu)r2 uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from tha-jf ) shh rguck y2ff*n:::h*e 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 5.0xpyqa:3 66ztpoofv 9z93bgu ,0 m from a barking dog. What would be the intensity level if two identical dogs very cl6uv3,p3a 99zozy: pq og6 tbfxose 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 sgzes, 5sxiqwo 2;iizwbb.x 6mx43 w*1ound 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 radiates equally in all directio*2ezs45i;xqs3 gb ,wx 1iz6owmx .wbins.

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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 95 dB. At whae(t *0ir1*v loe7pumj t distance will it be 75 dBiemjo( tv 7r*p u01el*?

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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 frequ+ w:7nzd+-rbasdp eq q9 pa89uency of 1200 Hz. What is the frequency of the s9: b9 - z aq++qdp8upa7rdwnefourth 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 o x/4ze.yq ;ilf+ 6ki zcs3at+2s- x :ffg2dbltpen pipe is 900 Hz. What is the length of-al2l fi+tesyx4. 3kz2/;ds i zcgftq 6f+:xb the pipe?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipeu7ezm xenn0 3q:v2:jo of length L is 400 Hz. What is the fo qe 32v:nn:uem0xzj 7requency of the lowest tone 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 0.80 m. If the velocity of souns:/kidj25ka05ud hza v 0d andnhi*8 ;d in air is 340 s5a:n8 ;z*i0 /hau2 d5 dnvkdidkjah0m/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 wheretkx v8szul4 bvmot.r)4x7.9 u7 sve:v 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 frequency in a pipe closed at one ebj ,mcgf2:v.wnd is 330 Hz. What is the frequency of thecwgjv:.m2bf, 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 that wil7gktvxr km)h.o3:9ijad uk(-l have a fundamental frequency of 60 Hz on a day when.thxr ma(j ukkgko:-di379 v) 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 th+0owwqm;fdps., hd6 s-cy ia; e 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 alfu+j)92 i .2y3p:i oefkrd np room where the temperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A closed organ pipe of length 0.75 m is 3 zyenh, ;vkrn bn m6+a.; v.xs.wm3jdplayed when the speed of sound in air is 340 m/s. What is r.evs;hm3y.+ ,wn6m 3 nn.d azxjkv ;bthe 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 open and the other is clogm40)pdr zy c t*mx;0tsed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed pipmgz04 *r)tcy dx0ptm ;e?

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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 y ji7/; m ugt1zkkmi :3bj:7icw +ed)femit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source :kf:mu3yb7 tk+)iimwg d/jecj7i ;1 z1 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 by the same frequency of g 2jlm gmk1(/xgca8j8c acg 29500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, wh(821gljac2c8xc k9j gmg mga/ich 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. Whabh.,s(bg 7nlb)wx7j/v zws 9l t 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 tune the fre. avxs om3xo x,+ ,z.iurhj/+iquency of a musical instrument. If the tuner hears a beat frequency of 2 Hz,/3h+r.ix xos,vou+.i,amxj z 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 hor e9keym5 xy-n(i-rg.rl3kbh,ns are 6 m and 7 m respectively. What beat frequency is heard nr, gy.b 5eyrikxke-39-h(ml 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 a6j0w gza+ 8555gog3q*f.zabtmiz vr b re found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension ooab vzztj 0*+.q5fg36 wazrg 58mbgi5 f 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; ka,ddhbmc-13,c yj:m 4wazujj.k -k00-Hz sound source at twice the speed of sound. The observer hears k;,14kh 3dz d bmajwjyc-.-umj,kca :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) approachef-i( ktj: efh1s a stationary observer at one-half the speeejhk t:i-( 1ffd 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 frequency of 1000 Hz. If a listener moves with a speed of 30 m/spt9ir0xwt* v6c rzd2l39 hd* a away from the source, what i20wr dc3tx *h9lrzp96atd*iv s 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. kqkriyki -, px,a62 6v It is 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 standing along the roadside. What change of frequea ,yxpq -vk6k2k6r,iincy 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 approaches w kopisr/: lp2n8 dkg7uc./4 jaith a speed of 30 d.u :sjlig/pk2n8/4c pok ar7m/s. The frequency 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 120 km/h. The train blows its 400-Hz whistwam2t1 4(d5sfol/ 4ib +ufgpzle. Take the speed of sound to be 340 m/s. mu4p(sbowfa+5l /142zti dgf 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 1205v kgz nz4e(qov0ty4 , km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of soun4tz4n0og( qy5v kzev ,d 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 y p4ds:+l 0u*z ism5ppeou at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequ0pzimlue p+ *45s :dpsency 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 youqfs9q5we/kr(-gpva0- z / kh v at 120 km/h. It blows its whistle, and you hear9vk z/ 5gs/ e(q0f --vqakrphw 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 500 Hz. Asseq5(nalwf- u v1 ,gtn5ume the speed of sound in air is 340 m/s. What is the freque-,5tf n15nauelg(vq wncy 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. Ass3; r8 fe)xywgzume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the trai x8r;f ye)g3wzn 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 deteri5eb gd-5 kqfwao0/ .omine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. 5/b-dg qw5e0.oakio fAssume 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,k z,hc1r s fh(ey7/yyt c1ri) $60^{\circ}$. 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 ce1y3m6fala0 ijh4bp10fvlv *f,i.fwonical shock wav lfpi*.,f0a 1yh 0b6wvff1e m4 iljav3e 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 Un9; w +rgp *bacczo6(gmited States to Europe with a Mach number ofw9;mbga* ( rpo6gc c+z 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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