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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://autoconfig.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://autoconfig.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 falw)0 fskoe/j2ise 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 wzwq;(t4 j*sjh,/f 7qi; ajjw conducted 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 steedxjt p6/f z37ol 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 increaseskx +z:x*w;j kartmg9w)w v/ g7, what happens to the velocity of sound? (Assume that all other ;w k *+xa r:g7zwkvm/)tg9 wjxfactors 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, 2,x82vcvqgupa t.o 0l2( p*im,lhq zc the velocity of a 200 Hz sound through air x,l2pap2li*q8m q,. 2 cgvuth (ov0czis

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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 s odu c+y/w2j/a 200 Hz sound in aj2yw/ c+/oudsir 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 v)a,zrhhfyly5 e9 *4i 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 freq kbf ;.zb)umglw,6(zuuency 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 waves uniformly in all l8ng9xcg9) mp directions. If you move to a p8)mpxn 99lgcg oint 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 proportiona 1i+ n+2sgjkcll 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)ch3e.kd -u5mcuu zw5yv8jb).v(yxz s8*ryk at a distance d from the source is I. What is th.v)b u8kmw 8*vj3ku(yschu yze5-d. )x5zyrce intensity 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 that is radiating equally in all nuj a0j;e8am5n7 e8 2 jkhml7sdirection7ek;majh7le828 5sjanu jm0ns. 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 dist 1i +yhxdq9y2t8h2rzfz op: 6cance from a sound source that is radiating equally in all directions. What happenshdfp126i+z y oy:2 cxq9tzhr8 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 incrg-v48z-n qwhbeases 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 charact3c9 xkg8or4ow.g:z 5qg nl j2oeristic of the sound increaq 4 8.oon zgwr932 lcxjkg:5goses?

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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 note? d5,m nfk;y,ypnn2u:e

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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)qe pv8 atwy n;coxi4usd8:2+" 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 frj sc: x1i9 ,hpbil2hp1om 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 displace5egtcmn/ g lx/4)n2mi ment 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 wave generated by/bv63 ( wamq idz3,x5l qo-gsf the guitar ag 3-qlqbz5oifxvsw(a 3/,d6 ms a 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 wiiksn06793uu xijfy ro8*p) i su +*cohich is open 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 wavelezx;p( rrs95 pungths of the three lowest(9rzp up; rx5s tones 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 resonate in an open pipe of length L is 200 Hz. c*mwsk0k) p+a Which one of the following frequencies will not resonate in the same pipca smw*pk 0k)+e?

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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. Which v/taj ,vyeav 1**gfk)statement is correc */yev g)akf* tv,v1ajt?

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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 ;sye1c(2 6 ;8xboqqdkm2iz czat 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 length L. What are the wavelengths of the thhlth t2p-7of ;ree lowest tones prof ; 2-top7htlhduced 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 cloeex:u+9 7ys mused pipe of length L is 200 Hz. Which of the following frequen m+9yux7e:ues cies 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 frequencfu2, t0w eqrjdyg(:5 yic )l,vy. Which statement i2ju)f( dlgvcy wiq0ry: ,,te5s 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 source. w 5w4ocrnp6*io;,s/qe 4asuz Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is;w4icsu oa *o6r w epn/s5z4,q 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 .9+2r/xv;*)ii fj s ls xczgffbeats, the 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 sounwf441cdn 0m mxded together and a particular beat frequency is heard. What happens to the beat freque4d0c4 fmxm1 wnncy 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 expmd) (fk*k6ay-pq 6xd nlains

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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 f(1 rl;i;nt;iak2qxw stationary observer. The frequency heard by the obser( w;l r a1;xifntki2q;ver 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 thevok v g4/bdz*-/ekn( y observer /v/*(4v-kzdogkenbyis

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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 wi jlc0jl6x*rz-ll decrease by a factor of-6lxr j 0cl*jz:

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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 ultrsi:;/,lay *mplhwdz;vnca55nz q0 , casonic sound of frequency 45 kHz in air is 352 m/s. What is the air temper5i5 lcnlszcnav d;,*,0z qm;a:p/wh yature?

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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 th zd w1ikq76u rzd5m;0he 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 mu o.rvj*f+br/;jf 1 te 3vs)xk( qfy*o/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the*v+ rksj)qx (f1 ./eborj3ff*;t vuoy 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 4.0.lgj+ +/* xqon5twleg 0 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 ligh 0q))p9hxb ) chc7i9gsat7 ln1ordqh 7tning, the distance to the lightning r t 9 cs97)opnxqhb71gi0)) ah dh7lcqstrike 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 xml4p ae9-v akl-kn58a 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 and hear the splash 2.5 s later. ims2uje a ;h7qu 6jq :wx;ak0ha(c 46j How deep is the well? (Ignocq;w uikaeaqja7(6:x 62hmhj s 0;u j4re 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 H*b o k3s9d) wzj7zn 3a5*gnmofz 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 a jzhkw).6;kw air 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 intenqtt iai8y9 2da3+j4jnsity $10^{-3} \; W/m^{2}$?

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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?z4ls -bv i w:q/ f owt9lon-1f1pcnj+8

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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 intensiti(72/kei)ryjl3a ztf jes of two sounds with intensity levels of 70 dB kj(lyrf7iz 2)taj e3/and 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 id1 hex2mca44t n a garage is 100 dB. What is the intensity level g2 maxtd4h4c e1enerated 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 f(i g- *(nzah6 )v+.-2csyc * jlxdpdw zmkx6rxrom a source that is radiating equally in all dz*jxy-wci2*gl) k6(m c h.xx pv-6d zsnr +(adirections 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 radia 6amfx*jj l(krm5- yu5op4 q0mting equally in all direc(xa p j0 yukr6lmqm 4m-*o55jftions 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 a+/on :9xbb0:7 vveerogi/w eabout 1 mW of power, which is assumed to be uniformly distributed in all directioveexernv+a/bo ig::9 /o07w bns. 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 barkingu 970c t/ev-nx y9;)zfnjnlqd19 gsbe dog. What would be the intensity level if two identical dogs very close to each other are barkingq9n9)tl7fn /-g 9xvz uc0 e;neb1jyds?

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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 soun+ )stcah4c/j pzcf 2q1d 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 a14tp fscc/z)c+ h2jqthe 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 wp0q.xp*ws +l rf7/fzis 95 dB. At what distance will it be 75 dB?7s wlr*pfpz /f .q0wx+

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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 compll otg*yk00 xe5ex tone has a frequency of 1200 Hz. What is the frequency of the foe0*ol0t k x5ygurth 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 harm v.kxthgy-b4 5lmph(y --6zm conic of an open pipe is 900 Hz. What is the length of tctm .zygxk (hy-56bl--hv4mphe 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 r5q9niups fvf+mc s.m(va c*- pp09u.au u3 1doesonate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2L?.u mp qp-0oi5 u1ds9v(sn3mu*avpf.u9fac c+

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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 thexpg5 .o*dy n knbh4g -jio805d velocity of soundk-o5id8n dpjnghbg y.4x0o 5* in air is 340 m/s, what 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 a2*axgx,-++lsunovh 8o/ diht 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 n xxw1v;n 6;ij330 Hz. What is the frequency n;1xw ij6nxv; 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 of9jlwk8i ci8a/ the shortest pipe closed on one end that will have a funda8clika / i9jw8mental frequency of 60 Hz on a day when 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 in a room where the tp-,np+ akeg)j+1 xsimemperature 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 tg, pa r1ot+h/;eln1kh he 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 w4t4,a,u7s n2b gdbf5cnwik)q pb- 7c in air is 340 m/s. What is the fundamental f4k7wwa 254qp ub ) tbdnn-b7,c,gcfisrequency?

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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 i.eu.kwx ylit57o./ kas open and the other is closed on one end. If the fundamental frequency of the /lxywk.5 . a.7tuei okopen 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 800 Hz in air where the velocii*/ 4ojk c vnxojd93j,pz0 n*cty of soundvji/npzj,c3 onoc* 9*0j kdx4 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 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 placedjnjb*umg443o side 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 person detects little or no sound, whi 4b3*ju 4gonmjch 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,yqj- j ni sl.de0(f hy5t,ou9 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 tuninsat(-:rqq wni.t dz./g fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, whw-/qid (rqasnt .z:.t at 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 hor* n *+wygajj0jns are 6 m and 7 m respectively. What beat f0a*jn gy*wj +jrequency 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 strings on two violins in an orchestra arz9m hqi 7 cu,dwyh-qw8,/dqg7e 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 frequencymq7i9 uzg7wcdhdy w /-,q8,hq?

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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 ster+xvfw 8)t h7:y nis(5;sj svationary 1000-Hz sound source at twice the speed of sound. The observer hears a frequencw7(vser8x:hj5i sn svfy;)t+ y 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) appr tn)rq(d: n ry,a4tj:/ a0dzcwoaches a stationary observer at one-half the speed of sound. a0w:rr t: yc td,/dna j4z)qn( 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 wixlmfvfk;s (wpkt 22)5th a speed of 30 m/s away from the source, what is the frequency heard by the obserm2w)k 5x( svf;kt pl2fver? (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/2w c)st*cjb r+ f*s.wcs on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What chact fwcss. j2)c w+r**bnge 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 hea467 rod/tco;s5 it(ud2wyffc rd by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn iswd4y6o(tu dsocictff ;/52r7 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 120 km/h. The train 4lad8;+aoe05k p onuh blows its 400-Hz whistle. Take the spp;4neook+5 ahl 08a dueed of sound 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 stationary train. The train blo8,i,f6u yy dainmu x +hfw rr5)u707pews its 400-Hz whistle. Take the speed of sound e+fh nx 6a )r,r ,7wiufudu5m780yyp ito 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* ww2yfe :vb of/8(lfots 400-Hz whistle. Take the speed of sound to be 340 m/s. Whfboowlv 8( eff2*/:wyat 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 nl/i: dlhx +w8120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound todlxw nl/:ih8+ 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 v+4ee5pz0nxwjb dk 4+is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heare+dpe5bw4 0k+xj nzv 4d 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 hornziu+ vp 0kv05b 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 appro+ pkv biuv05z0aching 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 t)rqas iujsk;c s87:9yvvp 59 out,pyk: ss9uvai5; t)qcv9r78 js and a 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 se oc*)p q3ws3cupersonic 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 11df etmfw( f)c ;f42;w up3nbx.4. What is the half-angle of the conical shock wavb(p;ww4 )cffufn ;emfx t2d13e formed?

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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 to5:six sh,upkbncpq)s :5h/.w Europe with a Mach number of 1.05 where the air tempera5hp:bp/ uqki): n5sc s.s h,xwture is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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