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习题练习：Physics Unit12: Sound
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 作者: admin  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 followin9b shw.mw w7uo0p o.+ )g;utdudpc2 l(g 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 conducteelm1qd )rdw4iyk* 2hqp ,.st;d 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 s(/cgyybn(w44(7ir9snhw qo d ound 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 happens to the velocity of so busopi q1eb7+i+x)dl;5n 9ae--b 85hsztkx n und? (Assume that all ohi+sobie+;pk-nze bxs7 1) t-5 axn95 u8bqd lther 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 velocity of a9ta:y eq:qao9sp r 7gk+:5tvy 200 Hz sound through gq+5 e:9 : k :9sya7ovpyatrtqair 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 sound, the6 r*wb;j(yki gmt64f rxac s25 wavelength of a 200 Hz sound in airkt626(4 sfrxrgai *5cj;wybm 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 gre 7qfa2c6 n9uqvater 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 lesxnc xw o5rt.8gi f;4g,c6aor6s 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 waves unifo+zv2v xl)-wzf db5p 5z wd,1kirmly in all directions. If you move to a point twice as far away from the source, the frequency of wwdv5p,k52-zd + ) lizxzfv1 bthe 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, intensity is prny yzn) 5vnx8tzmmw0o;m,ol te) k+)*oportional 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 pn-ac igbd+09 et5r;gvoint source at a distance d from the source is I. What is the intensity at a distance tg-c+v gae9i;5rdb n02d 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 in all di7yylb / *zmkgaok8mm*( x5e*vrections. What happens to the inteb8z yym5a7lv k*e*mg( kox*m/nsity 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 soundo nxw 3y,n.bpsyx 1kn;0 -qus8 source that is radiating equally in all directions.n- quyn n;kwx8spx ,os b3y.10 What happens 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 soundq.k/)p fvl7- rwi/ b*q (0z mb7ybyung 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 tokoc*m w /ah b;s3rgnybwxx(.542 ua*fne. What characteristic of to*f*bxham2rgn. (a;kb w/wuc5 3 4sxy he 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 "loudneom 2f02eivpy4ss" 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" e.ug9i 0gnd rs 1f+un+4c s:ldof 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 intqx fydfo(* z99o water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemd, c k8,zypsx+ent 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 wavwb 7yka9xn 2 ,jgp8jx+e generated by the guitar as a result of this vibration. Whatk2yjjn8x+9 a7w px ,gb 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, thef3b,cdovklw gz .3 u9qp(ai4;re

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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 arljk(n xkerbjs6 . d*8 hk0vsdo3x v):+e the wavelengths of the three lowest tones produc eoxr.(*nsjdkl3h 0k d8:6kj) bvs+xved 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 resonat uyux;r4qvyo qdy5q;w*9k826 mk -dnee in an open pipe of length L is 200 Hz. Which one of the fo*q2-vrq ko 8e4k y6um yux;n;dqw9dy5llowing 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 resonating at its fundamental frequency. ;0g x206mslz z9e uxyoWhich statement is cor oyu29xg zxzm6ls;e00rect?

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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, th56eapt+,rh bx0 phq-xere

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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 loop2rr+1j+rg 9n d7 revn)*jwrwest tones produced by this rj+pe2d17norr )j 9* rg+vwnrpipe?

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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 vcfm7x(c;cfm5:n-mn (qrxu 2 a closed pipe of length L is 200 Hz. Which of the following frequenciesf(-rncc;7 m5 mqv c:2(xnufmx 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 ao* of 2ya4po/s pu(*ukv2k t8v*-farct its fundamental frequency. Which statementf*2p k - (uyuvtsaa8/ o*o v*rf4poc2k 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 twz(co 3rp4xu yy:i:i1mrs-kj og4s:p -o speakers driven by the same source. Each speaker produces a tone with :x-coi p(j py 4sy :41i:krzrums-3goa 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, th)ykfs,)3ox za e two 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 togewk b9mg74qm1p 7zrxl6 vcq0l* ther and a particular beat frequency is heard. What happens to the beat frequency if the kvmc9q 1b 0rxw gqp6m*7lz l74frequency 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 exn9ys( thgm cu(1/ -jwnplains

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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 ;oq1xvdpu6: q observer. The frequency heard by the obsepx:6vq oq d1;urver 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 byal.icb51a/bd the obaaicbdl. 51/bserver 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 will decren )(xmkb8n(at ni -7iep43agease by a fmtn4ain 7e be()8ka 3(ng-ipxactor 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 35vm.:1iwad(a w ;pzna e5omue(9p6k6p2 m/s. What is thd9 eovua iw;.mak6 wanm6(( p: e5ppz1e 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 at 7xs g(u8 .w3.ougnnnneru ,omtc32 l.i j0fq8$0 \; ^{\circ}C$ 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 aiy( t ez7y le:oyae3 -so2bm1*or is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back oyyeto23:zeo(l*em y1bs-a7 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 4qd 5scy;;tkh 6.00 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 flas g3s6di1+9ojr 2kf *y wksb37t9jckpkh of lightning, the distance to the lightning strike is absk6f 9i+w2 csk dor* jgb7 jp1k3t39ykout

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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 clix 5drbvm k e33p p*z o)ymvu+4*scu2e8ff 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 adk+* blx ; h7mw.tck,;rdsow 4/a 2bjq deep well and hear the splash 2.5 s later. How deep is the well? (2h7,t;+* rckbos4/b . ldj wqkmx;dwaIgnore air resistance, 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 p3z rdv )(sbx(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 ap h ds k1*(g1g/iyeu z.op. rdzh**k.nir 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 intensit1ckr4d. z*w, bri qt;ty $10^{-3} \; W/m^{2}$?

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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 souugs r*2q, 0swu iu1+zcnd?

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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 int4oj;5to+ba:n *cvg -yr:crt i ensities of two sounds with intensity levels of 70 dB and 40 dBt o* :vy ir4b;ccg-r+oajn5t: ?

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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 intensi;xa n-yux(2hs d.gm:: we zysv sbx:6-ty level generated byg-xxz uxye2:s.(: bays; h-vswm n:6d 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 cau8gk)uftcv . 1f)4r6.0 m from a source that is radiating equally in all direu)8acf) .rgct1 u4vf kctions 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 thkwsr( u3b7sh - bk/s4tat is radiating equally in all diresh3u-b tbsrk4( w/ks 7ctions 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 uniforml5mrt*- :zz sg bf* g/ukiskr7h;m6co+y distributed in all directio 5tm h /6+7usi*:rgzm;fkgbzo crk*s-ns. 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 m from a barking dog. What woulb,ui0e.f /verd bee0 b./,u vrife the intensity 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 soukyriiu1i5 qgiw5i ykr..( j0;nd source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? kiqij ;05irwi1 y .u.(g yikr5Assume 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 a point source 7b4/u ta2klie;qktc0l r0)73 mq alqiis 95 dB. At what distance wilk 0q ler;3q2al7u4tl aibq07m)ikt c/l 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 y uq4p3nh l6-qcomplex tone has a frequency of 1200 Hz. What is the frequency ofqlph6q -3y 4nu 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 900 Hz. What is the lxlyk3u z:5iepb ufcc:e,(0k0ength of the piplic:pk , uz:e0yk ufe(530b cxe?

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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. What is qm xm5i)s) gg)e3cz s9-ztj4ithe frequency of the lot m5zi3 cssj-xz9g) q4mei g))west 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 0.8g54d i -e)riax: 8dilal,,ej kx-y(zb0 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmxel- :bdl,)i, e-i kri j8y4aa5zxd g(onic?

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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 temperature dqo+1h w1 mf6o4pvkc*v8vg) q 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 ;vi 5le i(plf7is 330 Hz. What is the frequency of the if5e;ivlpl (7third 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 ir4 hjvt01z 3awill have a fundamental frequency of 60 Hz on a day when the velocity oftrz3 4j0i ahv1 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 hg77es ebpm4 0in 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 x /bdf4mkhw:2; zo(r83 yi ghfroom 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 played whenmj1xk3g ny k/vk3 3l,s the speed of sound in air is 340 m/s.nv3kkxgm1s/l yjk, 33 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 ohckd p.)gw o 7x5sh-r-f the same length: one is open and the other is closed on one end. If the fundamental fre rdo5h g w.sh-p7)-ckxquency 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 em0iwqo3i:k:c ebg o2x 9sc r24zit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back92e 2x3:0irc wo sqz4 ogi:cbk 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 srqe 9(mj+tj;r)6xgn 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 the pe ) gtn(qxe+rs6mj9rj;rson 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. Whxc-izn5qke- 6 q,pl- sat 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 musi oinv:9nw uy09cal instrument. If thyun9 nwv o:i90e tuner hears a beat frequency 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 tw :w / aflxi:z8u4fv gpbs+eg+8o horns are 6 m and 7 m respectively. What beat frequency is heard when the h xz8f+::isv4ggafp+ lb8u w/eorns 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 violinm4d wnf 38ob9z6xk-9,4ksbd j ygm7 ges 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 of the strings would bring them to the same frequencyz9n6d-b8 o9b4 dx3egmfm 4k j7,s kgwy?

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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 y9 r) -sn)oiiu1000-Hz sound source at twice the speed of sound. The observer hears a f- o)uyn9rs)ii requency 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 stau*kgmu h1)y;yned0:0 dd4n1 zso hsw4tionary observer at one-half thy0sdd0h es1d1o )u4;zwn kn* g :um4hye 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. I q nrql8lwx(z7q*tl70f a listener moves with a speed of 30 m/s away fn*w0q lz q xl8l7q7(rtrom the source, what is 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. It is travxw3;tao gfs(+b-gw8 ueling at 35 m/s on a day when the speed of sound through air is 340 tb 8(3afuwog+w-xgs; m/s. The car approaches 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 heard by a stationary observer when a train approaches wit6j *chqcysae wtas); mw 5z,nmt,*8;x h a speed of 30 mss ;hew*cqj5m tx)an,wc; ,y6a8tz*m/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 8, u(d splf7d,wp)zufyou at 120 km/h. The train blows its 400-Hz whistle. Take the speed of so (ufz dw8ps,,f)u 7ldpund 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 m tux,rned:d m19b.v7 stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frer :mtm nd.,b17uvxde9quency 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/sww;y.a0 /bzo h. The train blows its 400-Hz whistle. Take the sya/ b.ow 0w;zspeed 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 * ynp7 5,dblx)ltl8 acyou hear a tone of 400 Hz.pc,lyn)b d75xal*tl8 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. Assume the speed ftmu4a(tq1/l7o :kn +bj xrfy8h w c8)of sound in air is 340 )tr+ k 1nf:4qt8blh(w8 /moxacy ujf7 m/s. 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 d2h7en :vn477vvpse/a ac+ew 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 thec 2:vne7e dw pa7s7a+4vvenh / 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 determi rr6pqn4r l9:ine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the spee ri4n:l9rr q6pd 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 co:lq* p*x9 s iz9sxo,gonical shock wave produced 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 spee r(x7 yqj4dt+ud of Mach 1.4. What is the half-angle of the conical shock wave fody 4u 7qr+(jtxrmed?

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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 nu2 xju3uzf/5lu mber of 1.05 where the aiuj/ ul 2uzx5f3r temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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