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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 following is a false scg8jy492pnv .a; kw shtatement?

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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 fasajn:xv4ql dcfu83 p* 2test 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 slx bxwl o y8g38f1l7r0ound 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 ah/j1)9 ni, dfmnd2 zzbir increases, what happens to the velocity of sound? (Assume that all otf,9bn i 1nhdjzdz m/)2her 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 sound, the velvhm 78awcw r+uq,3 fko +7bc5:yhy2mbocity of a 200 Hz sound through air iuf ,h5ybcawmrmkq+b72 c +v7 o3:h8yws

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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 ag ej2uq6 f):kof a 200 Hz sound in a6 uqfe:)2kjg 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 frequex.h+5,zok/cgt cas q5ncies 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 are 1kiw2 9 xuvs7f;8 ailecalled

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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 wta4d2y5a /uh*g eeh.v aves uniformly in all directions. If you move to a point twice e 4y ehvuaa*tg.hd5/2as 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 diverging wzkjery i/d)m *su1e (f(ou4e4vpok (0aves, 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 I. Whatwh5-jilwdbx0 xhfrc +ip 1(+4;u (wjp5 tuf9l is the intensity at a distanc( tu l1jjh5+bw5f;wcwrx0l (+h9u pii-p f dx4e 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 distancewhs,38iy gz2vmkvy *9 from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reducesyv ,sv *ik839ghzw2y m 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 zpi,jmxyd/yz)0 gb+r,7f6s l radiating equally in all directions. What happens to the intensity level of the soub zps6 l yr x)+7,jg/dmy0zi,fnd? 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 incdv( fs:jkg7. qiyhni9y :3fp3noi;; kreases as a sound becomes louder?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speaker emitting a pure tone. What characteristiccj,5*quf) uyy of thec), uq yfyuj5* 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 "loudness" of a mu zeyt a wz dega4)v .1lsab8dhrk6/6y78c( n8bsical 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 "pitc 1bf +wz.ka;lz,g2c8 np 8gmynh" of a 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 wakppijqk, 7b+8m 3aj+ jter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves ar+ze ivu.:bzkutj;f9k ev17 i,e

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave on a guitar string and the sound d/ 3xr*k 9qd,ivhx+inum )l td.6* mxgwave generated by the guitar as m,xrih/)d6x9 l*3 .dmt* qi ux+k nvgda result of this 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 open at bo4s q6):(t8grir5dpaxvu7u;e -osoqpq3 c/ h pth 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.s3 4b5wd k(4y(lybnia What are the wavelengths of the three lowest tones produced by this pipe?k4(y4bia ldws3y( n5b

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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 lengq9hak,a mg 0c2omw 7p0th L is 200 Hz. Which one of thao g9hpm207cqwm 0a,ke following frequencies will not resonate in the same pipe?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An open pipe of length L is resonlz hm11 q3os6rf7mx te c qt):fatp/9+ating at its fundamental frequency. Which statement is 1xfelmt+3:) qa /zh1mo9s cqtprtf67correct?

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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 01gv*gsh*a vjthe 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 tfe9 y8o(gna3z he wavelengths of the three lowest tones produced( 8yo 9na3fegz 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. Which ohd2. lu4ao x)h( * um8tccj2nlf the following frequencies wihul 4lhu(m o 82t2xc)aj*n.dcll 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 6v*.owgz n mqs*4w 7hxresonating at its fundamental frequency. Which stg4qw. 7*wz6 n* smxvohatement 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 th6pn4s :jkt-r)p+p apb e same source. Each speaker produce-pprppjk6 :4tn+a )sb s 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 3 xqc h11zl1j lx8+xl5dptre: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 particula weew3b08hc o;r beat frequency is heard. What ho38c e0w h;webappens to the beat frequency if the frequency of one of the tones is increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explain z s+poewi n(5x6i :avjmq(g89s

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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 h hp7vwy0v8kr1gs1lg5 eard by the observk15p1y vgvh 8gs lw07rer 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. Thpd+i h)t() g 2jossxn/e frequency heard by the observer i x+/ jgt si(oh2np)s)ds

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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-anoboau lhzv0,an51l ;0gle will decrease by a factor o0 obz 0h,v; 1llnao5auf:

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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 t/0v s ftk/eh/frequency 45 kHz in air is 352 m/s. What is thetv/ fhs//t 0ke 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 ofrr9i z xsq39s) 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 msxu,ac r82r l5 iw2q,b/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back thl5brxq,2a 8w su r,2cie 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 yvsw-a3 07xq,kontyv l9od:/ hear the echo 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 of lightning, bltx+en/o) w4 the distance to the lightx el4wnb o)/+tning 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 q*5d-pk km9:o fcf (snltv+qqz.x+ u-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 we,q:,alkzpi q;5e gv1 bel.ig 6ll and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assum:za,qlgg6;qbi ,e1 . ek p5live 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 Hf:s6ch e0v qk *p9tw,cr0ky(zz 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 ais6dnd3pb5,*ele u2 jsr at $23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity level of a sound with inte4z 4z/pkgq(/kmd9tytl hlw+7nsity $10^{-3} \; W/m^{2}$?

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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-dfke-nbn 0t14 tk63d ocB 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 with i8s p fh7uq.:rxy t6yt47 nwj1wntensity levels of 70 dB 6ytr1wxt8yp 4swf nu .7j:7h qand 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 garagez tjxjm 6-.x8l(r ap1o is 100 dB. What is the intensity level generaa lxm-1.(jx6ztopj 8r ted by one engine?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source that is radiating equally inz/3 4y tyihd10 pgx)fx all d)/ 3f xp0yg ydxhitz14irections 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 fro5n, g+s 6 8zj0:p;zowsozz li7wpe+chm a source that is radiating equally in all lpz 0:zzszg7o ew 68wsjo;p +ihnc+5,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 a:wt *; zkqz9gp0ia3vpower, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.0gvw0 a9qz* kz;pta:i3 0 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 barl *s 5.(tu0rnkf2ti jgking dog. What would be the intensity level if two identical dogsfj i520t(gnls .tu*r k 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 soundkcq zu(1f;f y ao//o :m4q)cgm source the intensity level is 60 dB. What is thfkq/q: a 4mo(z)oc;m1/c u gfye intensity level (in dB) at a point 2.0 m from the 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 8 :l m(mg0j/ vk2vxocn5.0 m from a point source is 95 dB. At what distance will it be 75 d0g/8:kcjon2 (mxlvv mB?

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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 c-etmsy() qw 6sfr+ cmsr8 8y5fomplex tone has a frequency of 1200 Hz. What is the frequencyqs(y mw5 m+-8f f8sy)ecstr6 r of the fourth harmonic?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonic of an open pipe is 90x-z+9 iqasj04q+fu re q d,/qa0 Hz. What is the leng9uxa- +saq qq4,f jqr0zide/+ th of 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 pipe of length L is 400 Hz. W q0 v2b)bnrz.s(y fyn3hat is the freqq2r(03 f zn yy)snbv.buency 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 vg2- ml0nsd bs1elocity of sound in air is 340 m/s, what2 -m1 gslbsdn0 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 wh:k5y9z2; yufw wr si,zere 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 ci;b yswqzy* -r, x;gv9losed at one end is 330 Hz. What is the frequency of th,;w;zq*g9x s yiyb-vre 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 shorteot.cro j1- 9xyn,8 bpist pipe closed on one end that will have a fundamental frequency of 60 Hz on a day wh b-n81o9rij.toyp ,xcen 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 o -wzsgl(r 0sbr,f-1r in 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 whe*/b)ebmnq;xl r0 *nqx re 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 sd.rj(mff ;/ol peed of sound in air is 340 m/s. What is tmjr ff; (/od.lhe 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 closed+,fl68+x4s-ead fwr wu0 nz )hmy2erx on one end. If the fundamental frequencyff, edn x)weuz 02x4rmwah8++y 6ls-r 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 of 800cmxp cvb) x-jfs;1y*8ctiz 0 . Hz in air where the velocity of sound is 340 m/s. How much farther b 8ptx*b f j0ys1cc).czvxi-m ;ack 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 tcr4;r*djfdt2nrdy*bv-2; jdtwx;/frequency of 500 Hz. If the distance from a person to d2*;2*jdr/y4tdc-jnb trx wvd;;rf tone 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 frequencjba 7g j(2*gro;ak6vq ies of 440 Hz and 444 Hz. What is the beat frequency?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A music tuner uses a 550-Hz tuning fork to tune the frequency of a music*pr x9glz,vz2e so6rdb .o *y7al instrument. If the tuner hears a beat frequency of 2 Hz, what is the freye*lz2o.or,b7p 9 s*xgd6v zrquency 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 m6aaj8u 4up3tpnqr * -horns are 6 m and 7 m respectively. Whaajq6u3mut*-8 n4pa r pt beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin string 0pir6kv:xt1k s on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one o:0kir 1kxvt6 pf 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 stabii.xe* ./ 2 6tdcnpv.rbr5cationary 1000-Hz sound source at twice the speed of sound. The observer hears a freq65nbii 2bec/a. rcprd.. xt*v uency 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 stationary obsub.lr / 0(i86jyo rtglerver at (yir g6 trj.u /0lob8lone-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 frequency of 1000 Hz. If a listener moves (3 c hs5vfxbcoj cycn3)8z e82with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The so3czehcc8 8b x)v53f socy2jn (und 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 trave3n hk6-lsz.1eylr5h* wus3 ec ling 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 stanl3 chhe rke3ls- 6su5. y*wz1nding 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 obm(/q.sn n o)gxserver when a train approaches with a speed of 30 m/s. The frequm )n(nqx./s goency 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 h px8by,b-/3adc83 tclxh) yi120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequench3b3tc la8 cdbx/ 8pyyx-)i,hy 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 s ko:jkj(klb k93h*7 af bg3cy3tationary train. The train blows its 400-Hz whistle. Tak*b3b39kky ( hgc: ljjf3 ao7kke 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 at 120 km/h. The train blows i.oiqdup 2e:v,8to zc( l(el3n ts 400-Hz whistl u(c p: t dnevq,e3o2(ilz.8ole. 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 whis(ug /f qt6rxzqsu,- y2tle, and you hear a tone of 400 Hz. Take the speed of sound to r2 - ,zuxu /q6gfsty(qbe 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.rr tg18co7cfqw .v .;q Assume 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 speed of 3o vcqcrq8tw7 .1fr .;g0.0 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 Hh.ku ehxf4 ,q6z. Assume the speed of sound in air is 340 m/s. What is the frequencyhhxu, ek.64f q heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sonar is used to determine the speed of an object. A 40-kHz7cr hx2/69adfflxc h 7 signal is sent out, and a 42-kHz signal is returned. hx6/ f7 d9 fc2rcx7lhaAssume 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 byuk wtb+t*/a q1 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 mz. /k,) ybr4rav0ay. q-ek grof the conical shock wave forme40,k r. / yqye ak)-.vgrrmbazd?

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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 with a Mach num i8loqq-*2rlba9 f-hsinwen5; ,bp l. ber of 1.05 where the air temperature qii,sol8a-9nlh 2wf-qlpne; 5 *rb.b is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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