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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 followingh;bofp 9 +ugab( ,o;fx 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 ac 8p:zozsiqg( v1m 00fastest 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 steem 7(f w2uf*mmwl 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 59bq qvu0k;dmincreases, what happens to the velocity of sound? (Assume that9m;q db uv0kq5 all 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 of a 400 Hz soundqi -wnd5kxo7vdcdi 0-c4 .bh2 , the velocity of a 200 Hz sound through air i0k7 c.db 5q2ci x vwdd-io4nh-s

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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 wavelength of a 200 Hz sound0ew/bw gx.ax5*.kb l y;)rwp1zb iz; r in air.;ygbw ;5 kplbxzx) *1 /wzrr 0wiea.b 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 H4dst 6n )pjzgttq0y.xsro;y rl-5-0t z 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 owg4 ) s8xweu220 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 wave4my6o:fb o dyn4yf r6v2 c.c(xs uniformly in all directions. If you move to a point twice as far away from tfy:yc.266x bm4y vocfdrno(4he source, the frequency of the sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, /0v6uzkrnxy 7 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 at5 : 79bwihw)kq fx1.sjap yd5r a distance d from the source is I. What is the intensity at a 9w. b)rq :d 75x 5khw1psjfyaidistance 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 dn9 u 3jcu*5 d xkp7,aaqnpq75t,k 4ndsound source that is radiating equally in all din,ku7 5ad,n9 dxqa dtnkc*45qj7u3p prections. 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 is radiating equally in all+p4-d;1xx/d s t: lfufetg(i+:ojbmy directions. What happens txd;+4d u :f(x-p:ie yfb+omt/l1 tjsgo 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 lo 10*n8jtop iuhdtyx8r3 ch7,quder?

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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 emshqqy;b7ebxz* 7f778 i2 lpljitting a pure tone. What characteristic of the sound increazby787;e*ji2slp7 7hf l qxbqses?

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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 muscyanq0/:q ap:, l aj.nrndn: o5y.i,hj(qd4lical 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 a4)fc jbyx8r v* musical note?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from air into wat4 n 0c d5;;w1dfzfgvgder

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementh*el tik5 be w( 80ei78fgji2f 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 string1bh m ii(-ux.2yiw r4u and the sound wave generated by the guitar as a result of this vm 1-i2w(ubi4iyx.r huibration. 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 open at both ends, t/ua z)ge4ce n14btlq: 0y tcuqjc6 ;(jhere

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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. What are the wavelengths 7.zcm rd6p 2lnof the three lowest tones produced r7c zpm.lnd2 6by 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 resonatf4f 601rws;v ehf ys6se in an open pipe of length L is 200 Hz. Which one of the following frequenci6rh;esf 46ssyv1ff w0es 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 fundamental frequency. Wks 17i;rw-qyu 1i bi: y303sks u2fhtrhich statementfk sr yr 3t uisy-i1wk7q13i2bu:;s h0 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 which is open at one end and closed at the other, t:ay.x .(8h 5hdw fezwohere

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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 threcm hsf,8ev y g/3e.s5re lowest tones prov 5h/sgc.8 fey3sr e,mduced 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 uc9,qq ,5m;rdal+y 8)94n v iu u-c8 pafzezauis 200 Hz. Which of the foll9)znu5uvfq-adm4;ycz r u,qaa, 98i e8p u+clowing 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 closed at one end is resonating at its fundamental pipzs t.g4zx 2kk,zt6;f 9ro)frequency. Which statement4,gs zt6k) kipf tz9p.rzo x;2 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 so7*pz5)k w+xp) r t5abr, iyht, ab- pnvf9iny/urce. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound w/95az,ipk7 t*)n 5-avyhbt)rrnpp,yi f+xb 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 cyir 2 z7b;t0,qik- tdtwo sound waves should have

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded together and a particularn:a3oykr 7cw nb* 0g2hq+77aj9ywl zo beat frequency is heard. What happens to the beat frequency if the frequency of ojlogya39w z77:rynwno7qck2 hba+0* ne 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 explainazx8v8y2 zp81+wf uujs

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a stationary observer. The frequency heard b 4ssso8 bp5-vzy the obsz4vp5 s bss-8oerver 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 stationary observer. The frequency heard by theitl59 usk q*nb* av7i; obse v k 9*bq5la7sit;i*nurver 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 toooh- hm e-:g11 8ieyw3/alcaa double its MACH-speed, its half-angle will decrease by a factoh1 / eho3 wmayaa:io8 e1l-c-gr 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 ( j8: gyypky7iof frequency 45 kHz in air is 352 m/s. What is thepj8y7igyyk( : 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 mp; dr ne)5mty9-po6r 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 is09n -/kwfyug i bqi(r* 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How *9f0b w-giu/kiynq(rfar 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.n b4orq wf72c-c nu,.k 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 dist sqg9h .*4od s nam53sgl3nrj+ance to the lightning strike is aboqs 4s.l3no3hranms *gg +d 59jut

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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 day the temperatur i(mz6gujd(v9 e 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 j9g66kr/gva ldeep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistanl g9rak6j/gv6ce, 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 wave of frequency 500 Hz ib3o u0t :7iiq f t,tefii2j+r8s

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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 ana: odsl dn s(/d0:yb.t $23 \; ^{\circ}C$ 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 sounde 8gpt fwj w.f+5jl:t:qv/ 8je: pwrj7 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 75 oa04c zflyq80-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 witmmlm5cn* 6wev(yl 7r( h intensity levels of 70 dB and 40(w5nrmel ml *c(6y7mv 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 dB. What is the intemu,nowodsd47 5 9z(a3 m ktd;unsity level generated by one engi(d9 5, dnkt3z7wd4 msu maou;one?

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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 distad +in876 tzd :uqf nf8*s6igcince of 6.0 m from a source that is radiating equally in qzi:78 nddcsf i*nfig68t+ u 6all directions 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 thatwr t sx.uu8mp3:.4gx p is radiating equally in all8u g34.w pxrxtpu:.m s 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 i rv 2tuclo4+m3s assumed to be uniformly distributed in al2otml+v3uc 4 rl 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 dB at a distance 5.00 mp+v-cz a55g r r)onrwply53b. from a barking dog. What would be the intensity level if two5n5wb-zor.+gy c 53 rap pr)lv 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 solyxc gat:w ,9 m2q)09oab /q)r(a*zawgx4cc cund 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 soucccawax2b9gg(r lt * cwxq9mz aq), 04ao/y:)rce radiates equally in all directions.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity level 5.0 m from a point sourl4et5z6p/)o 3gccwu yce is 95 dB. At what distance 536lcyo/gc)tu e z4w pwill 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 comqz) 8(+k e,mp se3m+r,cs r5cmj5lnncplex tone has a frequency of 1200 Hz. What is the frequency of tnm5l n+c)5zcsr8j3c, k m+m er ep(sq,he 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 pimlgje0 p(82o. : dmvvipe is 900 Hz. What is the length of80pj g e2vdmvm(o il:. 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 reso50ku z4bzw* emr5. ryt2z/kfr nate in an open pipe of length L is 400 Hz. What is the frequen4rrtk.w2 z e*kzz5 /b5ufrm 0ycy 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 velocityl va(/xigktl+ 8i 0s,o of sound in air is 340 m/s, wi(o ivx/st llk,g0a 8+hat 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 *xl :ydclp4s+l e73quin a room where 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 end is 330 Hz. What is the : yg0b+:i0njci-u yi cw5,pflfreqyliinp+f gy05wj u0-: ic:bc,uency of the 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 will huon djz;8ukp qx:hy74uu r59*ave a fundamental frequency of 60 Hz on a day when the velocity of sound is 340n8 yuqu:dou r9 57k jxzup4*;h 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 inh9(ci h- qf0d 3jz tr7ym/m0dw 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 temperatuzk 8iu,0 gxullh e9)72e(jaa rre 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 when the speed of sound+/xc;4tz hdc 6w9ri sr in air is 340 m/s. Wh i6t c +4w;hxs9/crzdrat 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 ov7 ,ykz4wnj8zt/ v. jef the same length: one is open and the other is closed on one endz.vzvt/w j4y87nj ,e k. If the fundamental frequency of 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 .nej4lzgaq 6fk- (3q1y4 t,euqsl i*t of 800 Hz in air where the velocity of sound is 340 m/s. How much fartheri-(lt3 ye4kqqa, 4nf6zq j.le1ug*st 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 by the same frequency(jm g haaqna2)h9v+/ppn1tq + 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 of the following is a possible the distance from the person to+ j /ppahqq(mv9aah n1g t+)n2 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 Hla,1d* czta :rz. 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 tuniu z: lo 8jhbwmls)vz2);bu- pl)s /lkgd z;-9xng fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the freque bg)h 2 lz-wv);slm/blu)zd8 ojpkl9 xz-us;:ncy 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 7 m res9b+ :6c(mo dnlknxp3jkvbkj *6h 6;y zpectively. What beat frequency is heard when the horns are sounded on a day when the vem(zkb6 * +v6;:6bdoc lkn9jjnxyk3hplocity 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 string,(e ss7poos m+cte/7 fs on two violins in an orchestra are found to produce a beat frequency 7e s,tmcp7f/s(s+o eoof 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 1000-Hz sound source at twice the speed of -bsm9ff)gemz p 9)p k;jhm.,:bxp m e*sound. The oe:)sx*pg9 mb;b-jepp ),f km.m9 zhmfbserver 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) approacsr3egfb0*:ln7 * xvi,k8oo elhes a stationary observer at one-half the speed of sound. Th*n :*k lxsv, 7ib8 eg3orlefo0e 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 witu,g 430vvvsrr gm9yp m*h3 5u o,zd8lxh a speed of 30 m/s away from the source, what is the frequency heard by the obser439rov y,mvz08hu 5s,p l vgg3d*xumr ver? (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/s on a day when th -;ed,m91 n)5ci1aeelc wio fde speed of sound through air is 340 m/s. The car approaches and passes an observere cidd5i el )9 11wemon;-f,ca 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 tralk y6zc5tvcqk 0ct: (3in approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound it6k yv3ltcq0 zck c5(:s 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 tow0 ehv ;j;sco0rard you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fresh;j 0roev c;0quency 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 towardixelw7 * 1u6nzn7l2derpy;5lf. f 0qg,hvbb) a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340f 1, g 6puwy0 bx.7in 2lrl7lbd)z;qf ee5v*hn 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 at 120 km/h. The trav.31 8iyt.dwu/6 ri,exnrtprin blows its 400-Hz whistle.r8 pine/r x,.t r.iyd 61wvu3t Take the 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 whistle, and,-;8 defqrq 5v9r) g tjaolltzc3+1na you hear a tone of 400 Hz. Take the speed of s5,ttladfq+-angr ;lz93)oer 1q8j cvound 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. Assume the speed of ,(id w.g) b)) i0j(j kw6btghpqd6vsf sound in air is 340 m/sqb6h.gt )vjj(swdp 6wdb,gi(ik0)) f. What is the frequency 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 otl5ew;2 -b0dopbub p i;,m5qxf sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approachin p-bo q xw;0m25l5;teb,dbp iug 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 aushgee15q((fw jx30l n object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume thu3qe jl1x (0ewgf5h (se 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 produced5v( -e9 nf f.bk0f+uqt ezwmm1 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. What is the half-angle of the conical c5xts f y;2pe2shock wave yfx25;p e2ct sformed?

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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 ka0+rc. :ysz, avst 7)zkrz 1s(xo 3yqEurope with a Mach number of 1.05 where t3r: tk,yv+zazs0oyac 7x)k qss.r z1(he air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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