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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://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://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 followim* nw+2ry;tajzo 5 yhq0qd ;w*ng 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 cond4q9 pd6ji-hzaucted fastest 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 solq. u cu0d ep)2xs+ez;/u /hpyund 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 m9okrsd2q/s4,kbpn* happens to the velocity of sound? (Assume that all other factors remain constant./sbpd ko ,smk42 *qn9r)

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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 throups7b pjiy684s2/ 6jc7:hn owyu; newag bpcjnjyo 4hw6s;sn86wu pi /727ay:eh 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 ofs.rfz t5 x,nfuw cv6.0 a 400 Hz sound, the wavelength of a 200 Hz sound in ais 6u5 vfr.nt 0wxf.z,cr 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 tha(:95* krwj(yc bbqh xdn 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 frequencxh7 cj/a3hc 4/ftdkp /y less than 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 wa*rshfk-h n/;;fxpe01ao u6a mves uniformly in all directions. If you move to a poin1a;ke mnpf/hsha *0 u-xr6of; t twice as far away from the 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 divergingr8*9rbeh ybr* 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 se9(fy8m .hqr +hit2 tj,esw/g ource is I. What is the intenwy,92f (tte8rg s+qj/himhe.sity at a distance 2d from the source?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source th:a5il zng3: w1fw kdc*at is radiating equally in all directions. What happens to the intensityniz f5:g *1c3wdklw: a 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 radia m;-li7m8zmvw ting equally in all directions. What happens to the intensity level of the ;mwvlm i-z8m 7sound? 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 bechd:k a4n4.u 2okve)1oj7)t .s rwphbeomes 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 et egmf5 x7-jw(s63i gemitting a pure tone. What characteristic of the sound-tg5m3e7ji( fgxs we6 increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn9o2lu l,rq3 dmnyd p67( aicb9ess" 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 musicr qdc oxa*+hq8 1n;*qfal 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 wag9 -*itp p,oemter

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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 gx*1 o6jfup 55 c6iox0ec ,fluare

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standinv oznzupo2b w b7*3(z6g wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. What bbn*p 6o7vuoz3w (z2zdo 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 ope7c;y.aw1wezo n 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. What are the wavelengths of thlhukk:q(vzg9( x*(, r a qs1:tgv6mk me three lowest tones produced,ksk:a(gu*z(6vk (:1 t qxlgvqh mmr9 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 ope/e8- yjf* nmpon pipe of length L is 200 Hz. Which one of the following frequencie-of jnmpe/*y8 s 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 fu m1q:f2, wfuh9fbe*resonating at its fundamental frequency. Which statement is cu9f 1f mqebuf:wh2,f *orrect?

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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 ek5r3 jrh u6( okqa9b5other, 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 loweshec/x, ile: ;+lbm4 .1xjemrbljc,+h b;4il mbx/ e r.me:xe1t tones produced 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;p-) u6y a0cv +esfz2ljcbn n7 L is 200 Hz. Which of the following frequencies will nsuc-;+a pl 7yjnn06 z f2bv)ecot 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 isjim06j m(f f92je4ihxsch5ehg a :;7l resonating at its fundamental frequency. Which statei6:0e7ie2 hchff m(x jj9 sm5hlga;4jment 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 sa6 7 g9uzesw)(nuovjuzy bu kso4q0-bwif,*((me source. Each speaker pru)(f 7b (z*jieyo quu vwsobw6u9nz- s,k4(0goduces a tone with a frequency of 200 Hz on a day when the speed 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 waves should h (9 qm9sh7eebgave

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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 s* p9.fqkubrtbw5p)jlxbs20 , ounded together and a particular beat frequency is heard. What happens to the beat freqxfu.5b kr2) 0pt,pw s b*9ljbquency 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 expla 1s .g) *dnl 5ose4bun*ft*dvpins

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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. Thds;7,s z gp oy 39xh3lmuj**kge frequency heard by the obseolus ypd g7* 3 j;hsmz9*g3xk,rver 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 stationv7x434tvxjq +zs ojcg 4u4-wtary observer. The frequency heard by the observeoxc+jgv4 -jt43 tzq4uvsx47 wr is

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a jet plane were to double its MACH-speed, its half-angle njuhh4p: u,8 r;rkth8y6i 4 hu2uim;mwill decrease by a factor of:2;j muruhhh4 iu ry4k ;pmnth:8i,u86

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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 iw kw 1pm;hq17kHz in air is 352 m/s. What is the air temperhk; 17p1m iwwqature?

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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 2uji l30 e6dow2qc; kdthe speed 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, a bat emits a shriek whh dvorl;g-mgpr/ 9+4pose echo reaches it 0.0250 s later. How far away was the objecprlrm49 ;v/ phgdg o-+t 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 l a1 :0fcanbk9 wc1tf5s. 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 fl0 cu:uk:xf kg8 vrzpl/c)7g gfmb+7;kash of lightning, the distance to thep +gf7 7fgkg/b;k8cc0 kxzuv ):: rmul lightning 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 day the temperatj4s )i:;n(3 wuferlyr 41m qsmure 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 lat i20.u:oxcl vah6:h )k0vgn ooer. How deep is the well? (Ignore air resistance, and assume the velocity of soundkxi 2a: v.ou) honh:l6oc00vg 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 frequenc1idv e ji1,p op9ql;5hy 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 airc 19m 8ew;k4mcu:uj uv 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 leveefl6dae,ot*r6 p 10 r6 xtzzd1l 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 70-dB sound(nuk* k6 l- wpp 7hok:/iwfez5?

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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 wi*nwuftt(i/0 ymbc:h+x/ ; gzqth intensity levels of 70 dB and 40 dB?gfywn/mbx:tti zq uc+/*(h; 0

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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 t0r3*+r ycwyx vhe intensity level generated b v*rw 3+cy0ryxy 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 that is radiating equalgf4t8 v*k+zzmplwvp9a:ka ;/9ac +wf ly in all di +w9f9alkvakz 8: tpv gp*m/4+fcazw;rections 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 e j*00s 2 5p)7enahg a,w+* /tnv:ctm tvqnndsvqually in all directi jt/v 0s0 5nn,apt* nhmw+7c vgn2da*v: )sqetons 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 hdfk j70dq :s/is assumed to be uniformly distributed in all directions. What is the intensity level at a dis/ q 0kfhddj7s:tance 5.00 m from the dog?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level is 65 dB at a distance 5.00 m from a barking dog. What (bg ;lck)ur8xwould be the intensit ()gcbr8xl ;kuy level if two identical dogs very close to each other are barking?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m from a sound sourziy+lx ;d2;t z57hdo7estg h 5ce 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 is7tl; oh7xdz5g2e zd5th;+y 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 source is 95 dB. A z/8g nxgj 8j7yzds) l*asq.9bt what distance will it nza8sy/ d78b.xjzq s9) lg *gjbe 75 dB?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a complex tone has a frequenc imme2k7 cvl dp7awmn,e2l9*;2 wsf+e4y md:py of 1200 Hz. What is the frequency of the fourth h2nekmd el *7l cpfv2w: , m9d;pw7ysm+ 42eiamarmonic?

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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 1 gi;m2parsxc./)jlbpipe is 900 Hz. What is the length of the piperxpl2m )i ;/1j bag.sc?

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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 lengthr4;dw9w8:q0 +w9a m t5umgkdvihw .rs L is 400 Hz. What is the frequency of the lowest tone that will resonate tidg+d .vw u9k: wrmws8mrw54 h;q9a0in 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.il o(7wxmke d3a n*m *x2i*e(q80 m. If the velocity of sound in air is 340 m/s, wh la2d(7wkmi*m ie *xqx(n3*eoat 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 temperatureo((swn-7 anl t6c.koyn3/ay j 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 33ce+rm(7i rjwwm,u 334 37 nz2yablq pg0 Hz. What is the frequency of the third,jwgyncaeq43 i 2mwbp lr+ 37z(37 mur 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 have a .d r60(l ;4groz 46uhqr kfkigfundamental frequency of 60 Hz on a day when the velocity of sound isf4 rh;4uz6d q0lrikr 6 .kgg(o 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 temperatv9 01plg /mz rk(k(lsjh0zsr4ure 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 wheu3y h 7gq uc. 3y*g..qi5jbne9r+mp gzre the temperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A closed organ pipe of length 0.75 m is played when the speed of sound in axx) 1kqc ht-1bir is 340 xq1 k)c- xhb1tm/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: one is open and the other is ba,v)za1 uu/k closed on one end. If the funda)b,uz1k /uvaamental 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 kmws:vuv+ ud s /+rtb *o*p6-fa frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved vr fpu +/o+ t v:-*sw6duk*msbso 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 sidm;mqcdy /, m:elyox ,:e by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and;mc/e o,x myyq:ldm :, 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 44vi,-:py xmpid3b spz.+ .vq *d4 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 tp bxjtfz fwb*9.9o6oar 3-7 zgo tune the frequency of a musical instrument. If the tuner hears a beat freqfat-b6* 9wo r37fp.bxz zj9oguency of 2 Hz, what is the frequency of the instrument?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the sounds produced by two f iyz;gk(jhj ;-zd4h q353nrihorns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocg(nirhz ih3;j-djy5 q 3f;z4 kity 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 pi* p +x6psses(3h)s0oonn;wp0 d y6zv roduce a beat 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 3swhdn6oy) s;*vpoz n+ex(p60i 0 ps sthe 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 atzd8 p7skxc ea089vq i* twice the speed of sound. The observer hears09c8vxpq7 sezk* d8ia a frequency of

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequency of 1000 Hz) approaches a stae( a11conr ai*0 sivs+o ywm2qgs+d-8tionary observer at one-hc(081v a- aons*sow iqr1id+s 2+yegmalf 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 frequency of 1000 Hz. If a listeor*h/:c xm at0ner moves with a speed of 30 m/s away from the source, what is the frequency heard by the observ/ roc:*mhta 0xer? (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 atp8*.rysa.ftm7u m 5c j1 koa8b 35 m/s on a day when the speed of sound through air is 340 m/s. The car bfa.8cok.7* 5 yutsam81 mj prapproaches 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 rbqhw6 n-f- kvyy*6fz0u p z,:heard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and th6 zy:nvfpw0,-qfbrzh y 6-uk *e 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;k3rmw-wgyhc t2a ww6:6rz9 z/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 mrgww;tw- :zh6zrac 39m6wy2k/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 blf,0zer(crh q+ u1nt upp5:sv /ows its 400-Hz whistle. Take the speed of sound to be 3 (t0v5nrf+/ us z:eh, 1upqprc40 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 train b5 dsh(7e nw-.flzs(dplows its 400-Hz whistle. (5zp . ndh l7w-e(sfsd 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 12kv x;+c.ter.tes5pm9 0 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. rv s;cm5x9p .tt+.keeWhat 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 train01 ss2wb nnd3lbxuz75 horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the ousslx0dw bn237 nzb15bserver 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 traino*ealp .2wi/n6lf d gyr10vr, horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed6r*0efvl lp a.gi ,o2dr1/wyn 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 tx )j5jg): qtmobject. A 40-kHz signal is sent out, and ax)jjtm:5) qtg 42-kHz signal is returned. Assume 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 aircraftpz 2 0g65gx,tl/e8xm3sds sza 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 ha w( d;njsg+cwcly0:v3lf-angle of the conical shock wavl cvy wwnd(: js;c+0g3e formed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplanem j pdp.in3qg86s96h q flies from the United States to Europe with a Mach number ofg6nm 3h6dqqp98i sj.p 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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