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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://tiku.one/test70.html
 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 statement?d9 1t6thdp uou 58+p8lim 9qhh

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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 ceaml 98 9e u(p2wtvg zkuv8p0q1h mq+1onducted 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 sound5qvas tj3bac /g50s1e 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 soub 0y5yw;7b) k41g wzir/ridmjnd? (Ass4k;y1y rb /grmwwi)z jb57id 0ume 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 of a 20y v.zkwf9qga-,2l3o g6d, /z hnk0cx i0 Hz sound through a6 lf/g,n3q ckhd-z0og zkw y2aiv,9.xir 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 d5 qu u*24k.zmtwkf3i, the wavelength of a 200 Hz sound in aimkku w*i24dzu tq3f5 .r 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 ):k 6.;zjz hfthyy8xugreater 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 fru uhkjm sn o)xa(6g,9+6 /gy jkod7m,tequency 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 sour;9lbj 5t5koh oce is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, thel k95 b5jhtoo; 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 wavesc4 ypbj+c cut,z:jko:-q 5p 5v5ym6hb, 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 8n3;4z 9g ek oysgfbl.the source is I. What is the intensity at a distance 2d from the sou;fgzn b84yoe3k ls9 .grce?

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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 equdk+ *tcx7kvw +kh; hriym8l14ally in all directions. What happens; +*xlkwckiv 8mh741tkhy dr+ 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 a sound source thdah2wwyi3 +h6vo8qs2 at is radiating equally in all directions. What happens to the intensity lehs8+ wahw22 6dviqy 3ovel 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 incrv .1uy(i,dolueases 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. 1mmsiz-v*vv 8 What characteristic of the sv8mvvsz* i -m1ound 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 music.h.l1uj w4ev xal 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 m830 8aeo brcfcusical 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 intoma;f9cq-i1 zrc6-e( ctf 0pqn 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 wavesx ;(nia- sz5uf 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/j u31lkdkq 7l;xg/tb wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves/q3 l ;g/bdkjutxk7l 1 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,jxc 3p) n1/5d0payw uk 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 h o2*(of4cucb/ :wbelof length L. What are the wavelengths of the three lowest tones producedco 2bf/(ocb*w4eh :ul 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 le)re jr-m2nd9j y/y ol)ngth L is 200 Hz. Which one of the following frequencies will not resonate y- nyrl9 j/rd)eo)mj 2in 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 fuzlo41jnb esc2-5c +nqdutjnq t:v25+ndamental frequency. Which statement is correjcbo2q2 -s nqtj z+:4uvn5+15cl dntect?

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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 jiygqf.1v. 6fg6v o-b 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 waveleng7waplmei-6 u9kzz zm21he8 )nths of the three lowest2zuz he7lwpm m691aiezk)8n - 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 L wx dq zv +x0y)bdo85/dis 200 Hz. Which of the following frequencies will not resonate 8 wdo)q+xy z0vbdd/x5 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 frequency.e8wg :rwg5zf( Which state(z5:fweggr w8ment 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 same source. Eacb/ a(fst7z m-hh speaker produces a tone with a frequency of 200 Hz on a day when the speed of soundzam f-t7h s(b/ 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 bea5mro i 0z7wc1gts, 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 sounded together i9jhp g+ p -;9gpbfc1tand a particular beat frequency is heard. What happens tj99b+pg pgp ;1hi- fcto 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 explai-k ( ispf:t:frns

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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 frequencvie*tc;x/.h4l jy *b,e z/xrvy heard by the observ/hcixt b/ v yzx*v 4j,;l.*ereer 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 t(a eoq /nz*u s73/ugdstationary observer. The frequency heard by the observera zdo*ue//7 qsg(u3nt 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 wi -mn kxud,5; q5blcel)ll decrease by a factocquxb m5n;d)e,-l lk 5r 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 352 ,3y p+bikmdm q,c o5m7m/s. What is thed,qi5k3y pm,mbmc7+o 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 pod y(4 l*odo0of 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 speedp.j:q t8emin44p ena 6 of sound in air 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 the sound4n8p qa.:ji6en m4p te?

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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 th 6.2.bukkpo r2/0gl hdp( ueide 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, the7y 1gux/avrz( distance to the lightning strike is 17(yuvrxza/g 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 v; ktkoopvq w/,d0,9ftemperature 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 dee29w:b,rj9 w dl:druqa p well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of so,l9 u:r:9ar jwbddqw2 und 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 50hnud 0mtttf6dc5 k 8 ukce6;h u;;sd/+0 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 atv0oz yuyn gyic,8n*vk1 to5:intg1-4 $23 \; ^{\circ}C$ 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 ),:b be01cxt o3+u wpdt cw6uta 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 o89-n7v hpbdjq*vn(q o e*k3r70-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 wg m4rmb(,;t q47 t4kukg5y pwzith intensity levels of 70 du, g44 m5q;rttkmb4gpz7k w y(B 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 in a ga(hbb1- nb .lpcrage is 100 dB. What is the intensity level gene -nb.p1(c lbhbrated 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 isk3tb(f+.w bk,ydmn *p radiating equally in aldpb,+ftb(y. kw3k n*ml directions 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 radiaty(yf2 oak gzha6nu/ */ing equally in all direc /az*y/a hgfu2nko6y(tions 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 powc,xafa df :xujin na(8:6c *3yer, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.0d y*38fcxa:: nix ac(unaf6j,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 barkicj+;+aue;j ;7b898byasn1asv6 lem j,hmdi xng dog. What would be the intensity level if t vae sx+i+hjady 968a;;jsn;7bj8,e mb cl1umwo 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 /xg a/bsodg*u8 6o5m+lb6yiy level is 60 dB. What is theb dlm/ i6ygy6*/ab8g+5ouxs o 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 56edngkat/ x xp0,f;( (n i(cfn.0 m from a point source is 95 dB. At what distance wf p( a0xd(nk,(i /n6egcx;nftill 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 complex tone has a w,9nz3d)y*le:l iwd vfrequency of 1200 Hz. What is the frequency)y,l*9wv3l: id ednwz 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 harmo g1o52u-s*/lszmlgqcxt k:+lnic of an open pipe is 900 Hz. What is the length of ssg+u2zo:l / 5xtl1-k c*qlgmthe 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-*:+p-bpb no 9kh wa sq9: of4pji5srm of length L is 400 Hz. What is the frequency of the lowest tone that will resonate i9j*ksro 5ab 9qp o :-pnb4- p:s+mhwfin 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. 0nkv r/xnr0dym1 )/dl If the velocity of sound in air is 340 m/s, what is the frequency of the secondxd0d mv0)/ /r1ynl rnk 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 roo5 qffwl.5swh8m 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 en:ixo sir+i,ac b)( /ynd is 330 Hz. What is the frequency of the third harmon/ ir+(o ixa)isyc,nb: ic?

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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 shortesjvo(x5n7m : ket pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of so5v7x en:kmj(o und 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 the0m c+;ce, fts)1cjir /myh(ah 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 teg lb 3hi9pp:jfb6)w .emperature 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 lengthctg j 8l n8820 onj;w0salfc8q 0.75 m is played when the speed of sound in air is 340 m/s. What issc 8ajqn80ol wl8tn 8g; 0fcj2 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 closed on bygn+*,gjc2 h one enbyg ,njh gc+2*d. If the fundamental 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 emhm 0:nib0. ynz,x en9mit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How muc hnm,:mn0ziyx0en b. 9h 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 placed side by side and drlxg rmal 5cp s6vh3+(z 0xe5.fiven 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, which of the following is a possible the distance from the person to the other speazg(x5.revafchlx0 +ms 3 6 pl5ker? (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 aa3 m ege7eafbfa ,o6-*2*qtqbnd 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 e-zg) mr3f olt*0sq7lfrequency of a musical instrument. If the tunz7l l30fgsr* qom-t) eer 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 two horns are 6 m and 7 m 9z 56aqpipv+h respectively. What beat frequency is heard when the horns are sounded 6pv5aphz 9 qi+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 o jl9y7c7;pm+.noai gg n 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 of the strings would bring them to the sg7j;o7cy9n+l. p gaimame 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 at twice the spee mvzxu+z;yr2 9d of sound. The observer hears a z ;9mxz ur2+vyfrequency 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 stationarj u e6si,)o,hfy observer at one-half the speed of sound. The observer hears a 6u)o , ,sifhjefrequency 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 with a spee7 s+f+oxn6rj2 qy9qr2 hej -pp6c lah8d of 30 m/s away from the source, jlr2+2o7r pcq e-98haq f6 sjynpx+ h6what 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 traveling at 35 m/s on a day iw0go 4lsw/ 3iwhen the speed of sound through air is 340 m/s. The car approaches and passes an o gs0o3iw/w4i lbserver 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 zcv,bady s7 /.2a,h*isy ,o8tovlz8r a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz an8.l7b sda yi,ah/2cotz, sro *,vzy8vd 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 blows its 400-q,hc +m lfq29y7ng lt2Hz whistle. 7 f2 ltq9l q,c2ygm+nhTake the speed 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(b p - :hfs8.qcpxa9 be*uhbk) train blows its 400-Hz whistle. Take the speed of sound to be 3cxb .qp*e(buf- 8sha): 9hpb k40 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 gt-.d. ny )to;pgc tejkl;n;; you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to g kny;jtg cln tt;op.e-;d;.)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 1p 1wu04lmuo:n 20 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sol 04npw1uu :mound 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 spe 6s1rmuqehj; qnj5ejauvkjte, /f9:y:k 8*9 hed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from th;k:h*k98nvjtu ej me9 qshu6rq,:j15 /yafeje 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 Hz. Assume the speed of soun;2nuv12-+du -uid fh-*jtp2m jbnp*wyi 8lgn d in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed otgu -pup n;-i2jvuyilhbdj nmf-*wn *2+ 182df 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 ofikh 43 (q iea)hnyf/2m an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object mif y3eaq(m4h/hk2 )inoving?

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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 airc52 x52l7:ia coodd+yq r eq2gdraft 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 the conicalzv3n9 w1 +gm 3uqxl6pukzu-oo:r1yo * shock wav93pu n11luq+oz*gwuo-6rvmky 3:xo ze 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 to Europe with a Mav 2 .e3mtulyupy :xbx.2/ q;gnch number of 1.05 where the air tem3yxt u2 ubn.;mye:l / g2qpv.xperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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