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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 followi wekw5,pdygw 937e z1d8l9yyung 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 conducted v+zfq ,6fxd8 n)6bx9xht,d wffastest 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( g/qst .(*b 5eqjzf dlzc3+ymound 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 )9us/(ftptmxv 2c4 h:rx oku.sound? (Assume that all (cmsv9k utp:fro)xt 2u/h 4x.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 sot cnz.7j-tb2 qo+n3hound, the velocity of a 200 Hz sound through a3 htn2czon-t+ .qj7boir 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 o6mt72z ua6 ezq+s*wg ff a 400 Hz sound, the wavelength of a 200 Hz sound in az26saw fztgm*7equ 6 +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 y+aaxhrhpj8xu rca0dc(c /j4y, +c8 )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 thrp* ( u hg;dgv;lyfdv (ae6he ;*kz*w3an 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 directions. Ii;8h 613gelc(f,v gy-v eqzdg.*eoj o f you move to a point twice as far away from c1eqdo h;3 .,j(g *lgio-ezge6vyf v8the 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 diver87rkxn(t , msmging waves, 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 distans3z i8vyn5i ;nce d from the source is I. What is the intensity at a distance 2d from8s;nyni 3zvi 5 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 radiategc-*d vht7/ eing equally in all directions. What happens to the intensity of the sound? It reduceved 7het*/ c-gs 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 sortu7 km*m0) /x:aeac curce that is radiating equally in all directions. What happens to the intensity level o/um7ae :kct0mx* rac)f 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 followina o oaxai7cl5/h/v.6qg increases 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 bc47j*xsd01 iyffb92 qmc+8) gj pngywl5jt9tone. What characteristic of the sound ii09cm+s8txqf*jp 4c5 12jb) 7 gb dw ygj9yfnlncreases?

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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 notjrx .;0gw:4 m*aywpc re?

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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 m. 14u6ct-gl dl.kpiu 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 wate(dqyj/ue,ab ow(wn fq9+8r*gr

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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 xgo2m7bqrp4a+f ,-yfare

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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 byb ))1k r: otbax(w/hf87zmocx the guitar as a result of this vibration. ax m)hfo bz8brkxw:o/ (7)1ct 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 bnf *gd 5 t4h.h:588c z(4oluqs invhuat 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 wavelengths of the three los-; myoahsya)z /*i2 xwest tonesax/*;simh z 2ay)o y-s 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 200r;5q63c mtr (rlowf* b Hz. Which one of the following ;r5lr q r*(omb63twfc 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 lengi6 iy*2yhw.k0pr1:d r 4kk 8wh+leyueth L is resonating at its fundamental frequency. Which statement is correcthkhri0yeld61p 8 ekk *+.iu2rw wy4y :?

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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 otbhs,. s-v/qp:tjhiqr 7w8ff( her, 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 w,x9e1mlxo bkgnnm0l;. k /a;the wavelengths of the three lowest tones pkg.nn9b wk ;xmlx e ;m0ao,/l1roduced 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 lengo i)ey7,; bhe0vxbfn1q5s. yh th L is 200 Hz. Which of the following frequencies will not resonate in toy1shbvx,5e)f e7 b.qhin0 ; yhat 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 f(b tux1ph01w6:zwgfmw) ql:qrequency. Which st(0::1p)hqu1zlww bm qgf6xwt atement 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. Each speaker pr2c;xt( ej6gvu q0j1yu oduc j c1qu; y(t62xejgv0ues 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 sound wa zlslkg3 l-(wy150f ; jhknaz/ves 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 togi rwrlyv(b)gz18l:-mether and a particular beat frequency is heard. What happens to the beat)ly :wlirr-m8bvz1 g( 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 explainjvdt6kj3zf f; sj ,; x8pdb4x9s

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approachem(;2 ecx /wa4gi wdb)ys a stationary observer. The frequency heard by the obsamwyec4) 2 wgi/xb(d;erver 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 observsgz* d ;jbt23ker. The frequency heard by the observer idjz2s 3tg *b;ks

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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 diqi4..ve/ hdke6ye h.ouble its MACH-speed, its half-angle will decrease by a factor oq /k.d .vhe.ehi 6eyi4f:

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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 i pdz(b ,njn,25c g9cz+k5rnw7s cm jp9s 352 m/s. What is t52cm ,7c 5(ng jcp9,np+nkb dz9wrzjs he 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 ofpd3b 6r f ypb.,:d uy1;(nmxeb 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 emjg rd8b1*i-9bu 5v7gfa t4fmhits a shriek whose echo reaches it 0.jt9rg fdgi 4b-b1 8 u*afvm57h0250 s later. How far away was the 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 heac/2 9fnbvz:rs .unkbz0ph +,sr 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 fl*wd a4q :gvwi;ash of lightning, the distance to the lightning sa4id q;wv: *gwtrike 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 cliff on a day the temperatu0uvr 7vzf(y lp, di:c-re 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. How d,)qaad 2cod69w p7l f8rri+ ebeep is )c+dq7lo869e2rp , fabria dwthe well? (Ignore 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 55o lzroqb(gd6oxk 8, of frequency 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 aykg*b3lfu(:5 udijm 1 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 of w c aws.(*l,q bk;yqkoy-lazp1mh)l+9 +e xk8a 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-dB so--ptj/gnz7 byc c6c: cj p0qc-und?

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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 int(0g. 2sqryu 1h5+ht go7 sp r-,zuw8xxqx3fniensity levels of 70 dB and t1 .nszr835- uy 72rfqhx x+,ws0q(hogupxig40 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 garage is 100 dB.oofy.x75ra6 p .nho.x, uq .et What is the intensity level generated by on..txxp6fou7 .r,no 5qy hea.oe 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 distanc sm:*8yin *esee of 6.0 m from a source that is radiating equally in all directions meiyess8n:* * 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 6b,s ; eyjg4 cuzdv;h8n7+ 8vlg.0 m from a source that is radiating equally in allgv n ;zvyg8,euh8cl7 ;jsbd+4 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 l,zrq ;1qo0dcjxn,r2 is assumed to be uniformly distributed,xc;2 qdnr0q1rjo l z, in all 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 from a barking dog. Whate+0 en7siof x)dc:3a d would be the intensity level if two identical dogs very close to each other are barking e)idx d7asef0:3o+ nc?

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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 60 dB. (lwh .ktta8-eWhat is the intensity level (in dB) at a point(h kwt a-.8tle 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 pom4j5uv-s-n +wjq8 fp(lllks/*q 7 gnvint source is 95 dB. At what distance will it be 75 dB?qv/ -5mj7vsjl ( l+ 4-l8nwf* sungqpk

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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 cou u xhj+byf4mi42;j0 umplex tone has a frequency of 1200 Hz. What is the frequency of the fb40iumx+ yuhf ju4;2jourth 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 ze q,p4*k+4:jigjko mHz. What is the lengthj g+pk,keo* mji44:qz 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 resonat-k1tpvklaxt1 sc 4* k+e in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone thpl ksk+*t 1-4tx1avkcat 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 velocity of somv)j5ywfajy9t4b413wmok; a und in air is 340 m4 1jabfa;yw m4v5t j9yw)mo3k/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 h zf.-b-lf(z 1icgr6 na 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 pipeoaa ql *hs-( y2/0tvwh closed at one end is 330 Hz. What is the frequency of the thir -v/q2ow(hah l*ta 0syd 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 will have;5 n9.8k sjobrenbpjh x56 th1.ssg )k a fundamental frequency of tbbe169sh.sxp.n8kn osr55)hg ; jjk60 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 u ilw4.: hui--u cdx7jwhere 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/o)g hrgha4 g. 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 lekiry7;as (9mqk s+a0*adxz3mngth 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental frequen3 a( 7a9mqaks*+xsdmy;0k rizcy?

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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 othcz o1mi q1u:5le 5q.n one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency tc1 oh q5i:mzqu5le1.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 a;r2ou- o) q7 y+xzsh,j1kmmuhir 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 souohq ,ohr+; kz7 mu2)yuxsm 1-jrces 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 p*9k;*yfhe;x0 0c hyqow5fh cfrequency of 500 Hz. If the distance from a persq*cx*wo;0kyhhfce5 0 py f9 h;on 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 frequd aeq0ilw)d 3zifo9:(6 ik6frencies 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 tue*aeq 5l3 c3eb9gd:uruz(ky 8ning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of ka9b3dul(8: 5q3ecy * euezrgthe 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 pi ez f(a9+.cp67qqaotroduced by two horns are 6 m and 7 m respectively. What beat frequency is he cqi(t.a o+q9 7apzef6ard 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 orcs(ok0/m.piwxaab g6szxibo9 )oq4ks4p5 5i 8hestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz i. (ipx)bgiqksk4mx o0 8osbwa 5zso/a49p i56s 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 1000-Hz sound source at twice the ,jb av4oo 9ir6uxwkv 5;vt-;kspeed of sound. The observer hears k6i 4bt;w-v rvu95;xak,ovjoa frequency 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 stativ o jific nfb t/1mp9zn;w+h+798,v jkonary observer at one-half the speed of sounw;n/vi no jtij89v1fzb+k,m c79+fphd. 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 wit9; ;g0sfa0 iliym-c fkh a speed of 30 m/s away from theif;l 0c-y i9k sf0mga; 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 sirv )-dlw2ce;vp en. It is traveling 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 standing along the roadside. What change of frequency e- ; 2vcpvwdl)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 approachec1uc e3- aer*es with a speed o3 crc* u-aeee1f 30 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 youh0a skl rb.u3c5 b9f0p at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearc5b3ah 00s.f 9buplkr?

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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 96y 1qoen1cfzx:aq t6 stationary train. The train blows its 400-Hz whistlefoaq 1:c169 t6q nxyze. Take 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 awayaj :0psdfieo8 ro0(ydw57sw , from you at 120 km/h. The train blows its 400-Hz whistle. Take trs0,o ifdwjpe7w ysda5: o( 08he 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 youqus c)i9 7ay5b) tzax.cab-, z at 120 km/h. It blows its whistle, and you hear a tc7 ,z-9u.ysaz)txi5abab q c) one of 400 Hz. 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 of sound iln/*+ v6 t/tcvu* uo(wqkuyx3n air is 340 m/s. What is the frequency heard by an observer if the observer is movingvv//3* u+uwtc(y qkltuo* 6nx 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 ho+or,;err1 o3 gt auc6e-bs4xi rn 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 approaching the train with a spee;-o ta3+1 xo,re c 6rbi4urgsed 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. b8ot*ikupk8 8 A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of so*ptkubk88 8i ound 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 coo6,) 9lsy gd):nf; i,shmisz fw)cmq0nical 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 speed of Mach 1.4. What is the half-anggs2a82rmpno 3cl2;fgw zb m/ndr7-pi10wd5fle of the conical shock wave fg2-pbdo fiwd12r;cz as8mf l0732wmnrng 5 p/ ormed?

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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 Mf x: ofchj3nn3;0t8 roach number of 1.05 where the air temper o0 xo3h3:j8n n;tcfrfature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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