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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 following is a false stlo5z 30i)ws bcn) l(cbatement?

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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 condu3rl *5sku gn,ek yq:q*cted 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 sound in a steel rod?4mgqb;+;j3q mkbu 1oc43 vrkm

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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 happensd+q+y jx.njq* to the velocity of sound? .*qjnj + yx+dq (Assume that 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 sound, the velocity rf+s*k r d-yq9of a 200 Hz sound throughsrd 9+y*-fk qr 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 sound, the wavelength of a 200 Hz sound i24-oznh0oi. o;o vqe kgv1w gq0 i-k(bn a(nieb 2i-ov0okvgwo 41h0 -q.ozk ;qg ir 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 Hz ad) hi gu;m3zuuj*+tl5re 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 cyupg98dt,zgy4ka o6 gfzndcw 8,6. 1balled

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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 unifdo0o . * ilgcjm id94v1 cl51qncuq3,vormly in all directions. If you m0oc1viucql5q *l di9m d cvo .4n,3j1gove to a point 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 diverging waves, intensity is 1ir);alrtbn ;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 so6g tn/q.grk3 nurce at a distance d from the source is I. What is the intensity at a distance 2d from gn/nk 6.r 3tgqthe 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 r7gn /ow/o bup/,q4wmva+4 ;c +uwnwztadiating equally in all direwvob+/aw/;w cq t 4wm7go,z/+ u4unpnctions. 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 80t x)9l-,la9y)ciz yctsqxpe) .z awa sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It drops byitex.8) a yzcaqw9-s l xy)lz,0tp)9 c

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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 in p;vnl-lw ch9bqhg1:2( b(q8k3i htdtcreases 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 a1-:zgg0 mmov n speaker emitting a pure tone. What characteristic of the sound increases?0:m mg z1-gonv

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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 musical noucm ss4,98psmoh k 8n4te?

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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 musical dbvv :q42p2j:q yw/ty 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 frorn;0mh nxrd*- ;1trv km 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 displacement waves ar/, b1*imzht8x 3xfdisx+gptz, fy v-0e

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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 wave generatedo8mrb7nbb4s 8 by the guitar as a result of this vibration. What do these two waves havebbro 88sn7m4b 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 bot)3 ou8tkeph +psh 3s * zq2x)-beb(rdbh 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 o l*mdcq. 47kolength L. What are the wavelengths of the three lowest toneqolm7kd c4 .*os 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 resonagq6 tfz bf k-ffm*76.le dil*,te in an open pipe of length L is 200 Hz. Which one of the following frequencies bqe6-m.ik fllfg ,*6ffd*z7twill 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 rd3qy1kdx 1+f yesonating at its fundamental frequency. Which statement is correcxdfy13+ kq1y dt?

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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 openwcq *llq308s nxh4 7ivirl 1m3 at one end and closed at the 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 h+0h3hfup3 n eph+0rqpmv89 plength L. What are the wavelengths of the three lowest tones produced by 98ehh+ 0pp3 fv 0nu3q+hr pphmthis 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. -j j ra9q,g.fmWhich of the following frequencies will not resonate in that pipe,garj-9 qfmj. ?

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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 fundamen;sfm5kyj,r a 2tal frequency. Which statem5 jm,fksy ar;2ent 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 x 3d gbj zas*8d5hgvs, f(k:4 hj5;urathe same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound iax8 hhd;g*4 s3 (ajj5 d:vuszb kfg5r,s 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 xwp;6oeb8 r-8tabm7 ftwo 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 socz2:c jmwky t ycliep0)uk8 9,6tde;6unded together and a particular beat frequency is heard. What happens to the beat frequency if the frequen2c u6:mzc),0pdy; c9 eykjk lit wet86cy 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 expfcuiz..ur 3* zlains

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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 heaqljliz-ml2k)- ex s+b p0u-s4p9 /gycrd by the observer luz l -9-q)pkesl-+/ 4bxji csm2p0gyis

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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. Thek/ shxob- 0bn(k0v:fwgge +f- frequency heard by the ofgw /ksf+b(nbex g-vk 0:oh-0bserver 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 t 3s- *-xglqkdsw-oh 2upzo6k3o double its MACH-speed, its half-angle will decrease by a factor odx2 -kook*w3us3-6 shq lg zp-f:

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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 frequz;jdo l 9yl )5llv*t oikfxo/w7z2o;-ency 45 kHz in air is 352 m/s. What is the air tem;ozll x jydz;i7kot5lwv)fo2*9 ol-/perature?

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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 i w:*x(yp2z ijfz4ym;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 who eq5f(om+n //jry5qwu se echo reaches it 0.0250 s later. How far away was u5f/r/m+qey5w (o nj qthe 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 temperature i78 ujy7y4fz,.(g0w 9y nmry(p5v*tipm avxlz s $0 \; ^{\circ}C$. 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 dtfrzd ,xmzv (m rv:/tzm3, ppd2:i rqm,(24elistance to the lightning stri /tdmmp,z,r 3xp4(vf(,zrq:mt2 i :zvld2er mke 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 sd1pkyc g fkf3t,v8 *5s 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 anzi0/o* az1pp+vf( l pud hear the splash 2.5 s later. How deep is the well? (Ignovpzfl*(i 0a+1p/z op ure 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 frequezeq d pl+7olgc -3+0ryvart 1fo.(w2u ncy 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 atixikwa 94s2j91dyv :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 ob-zp q ma5xesnp2)5 :nf 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- t+7h8.:e: hawq,wxdmgq 6l1-j kpo7l lvce k(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 with intensi0yfkvjj 1z5t)ty levels of 70 dB and 40 jkyv 0tj z5)f1dB?

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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 10e v,62lwt6a4t u 7y;cgemlo b, 4,yxfx0 dB. What is the intensity level generat44x y evbc,ywt,alg 6;,e6ufx2mlo t7ed 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 in m q6x rliy1 0r6iyt/b-all directions my1xilb0 -6 qyt 6irr/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 )rr+dolvm6,e is radiating equally in all6r,d + roe)vml 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 is assumed to be unif93 f8z8iamy1or /iagpr7pihy-t : 2nx ormly distributed in 8-1tzhp7a2 r/ yf8ga p:9omxiiy nr3iall 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 m from58yhtwsa.h6 r88(m-wv2 z.q mm mule a a barking dog. What would 2l aha qyhm8 v5-8w8t e.mm.u6zmw(srbe 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 sound source the intensity level is(xt+88wzd xys*mr ahbsw /8 4g 60 dB. What is the inten*84m+8 d/(sxt zrwhbw x8gsya sity 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 5.0 m from a point source is 95 dB. Atu i x;yyb ;6dyjpw7-p 8yxd6egl6/y,t what distance will it 8-xe6 y liy/ypj7,tyu;yw 6gd ;p6 xdbbe 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 complen fcu6gk (1p:fx tone has a frequency of 1200 Hz. What is the frequency of the fourt :pf gfcnu16(kh 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 ae 8 ckd8j7zw2of an open pipe is 900 Hz. What is the length of thw7z jkad8e82c e 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 leng oa(*i*f) spuwth L is 400 Hz. What is the frequency of the lowest tone that will resona)a*wps(uo*i fte 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 velocit 151wurtfu ,vw4a2muyy of sound in air is 340 m/s, what is the frequa5v2r uw1t muuwf4,y1ency 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 b l i9at11oa7,nd 3jswthe 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 pip:fro2cs ;aa hfxw(r;)e closed at one end is 330 Hz. What is the frequency of the third harmo;sfr wf2:hc ;)rxa (aonic?

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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 o*c1,cv(kmf0sq (jcn4 ev kx*h- gn 5grne end that will have a fundamental frequency of 60 Hz on a day when the velocity of k(h*jv* (sec n ,q5rng gx c4fk0-v1mcsound 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 wherncch i+ hii ,dre7mon186-v2we 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 temperature is b, 2 qxhcih 7xl7f5n2ui:cud5$20 \; ^{\circ}C$. 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 75 y 1as*hljqliz7hy6in air is 340 m/s. What 7y* yh7ijz l5saq1lh6 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 oth9mlqvvz4hig5m7ys q(ei q/ (,h jk3 3uer is closed on one end. If the fundamental frequency of the open pipe is 375 z ,mivg(suq(hlm vyeqk3/j3i9q4 h00 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 frequenytejkq1w+h7- -x4 mivjb 1m:lcy 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 so an observer in front of the sources would hear no sh 4jwlmeqix 1-: mv7tb+-k1jyound?

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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:1x;i aa7snti jnr 83r and driven by the same frequency of 500 Hz. If the d1rr ; 3n7nits8aaj:ix istance 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 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. What ilb6ruh3l32k/d 3pi t ps 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 toh yjwksu.whs+3 8i ou*;f 9/p7r adu9;kz: fck tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what iscpjhi.wzu97:h/fksoa+8 wu 3u; ;* k 9 kyrdfs 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 horns are 6 m and 7 m respectiv5jvy, bm1 d (uoeb3ba-ely. What beat frequency is hear,avubyo(3-1 b5je bmd d 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 orya+c:gj - 6koychestra are found to produce a beat frequency of 2 Hz when a freq+:o6j ycgyk-auency 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 100+9gjubqbvp 2-0gh fz09uj 3n n0-Hz sound source at twice the speed of sound. The observer hears a frj92n nz u3vpqfghbgb+09 j- u0equency 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 ob,zp k-/mrqlr9server at one-half the speed of sound. The observer heapmzl/q ,kr9r- rs 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 frequencybu g (gs/;dkw9 of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? ;9 s(udgbw/kg(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 fqzpmvln hnv9-:1z4eo 05b z:traveling at 35 m/s on a day when the speed of sound throu::b nofvl 0 zz 4pnq9-1zehv5mgh air is 340 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 hear)lsv 9gkz p9a/d by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hza)v9z/kl p 9sg 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 3k9b6njz j)zdx6 dd7b 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What 7bdx9)6b 3djj6zd knz 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 blows ilcj c1a)arl/5ts 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear? crc)llaj/15a

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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 its 400-Hz76 pu-dgdjyo03o(jyejr i3 u n9kn5q 1 whistle. Tak5 d9no e1uonk3u3p7j(qdyy r-j06gije 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/hc fp cqpxc5zs 5le:13pxw0l ,gi(:ex+. It blows its whistle, and you hear a tone of 400 Hz. Take e 5 zleipfq+5(pc:0x 3c ,lwxpxcg1:sthe 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 of sound in air is t 3tocjnyy. zi jn.7cz-57.d/uzxzh,340 m/s. What is the frequency heard by an observer if uiz znt. -ho5cj.nxjdc 73t7/yzz ,y. 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 truw6b,rm5x( u( jq42ntvrnv 97jy c+mwfzs43 f ain horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency m xfn7 46vusru5bjm3y2w 4vw+ct(z9j(qnrf,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-kHz signal is sent om4e7g 0dkq 8umc5cv9out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. H7 c4 0kedq9ocvmg85mu ow 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 supsmods r5 3,y:cersonic 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 thi wc hcljh-e+g8g7*f3e conical shock wagf* l7ghc3ch8 wei-+jve formed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplaneti .z 73du, :xj5cxzln flies from the United States to Europe with a Mach number of 1. d,u37ntzxx lczji.:5 05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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