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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 / l1ary77n f3.atayaqtdw6ttv e26x7statement?

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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 fastest through* j9)gs ihfzk,

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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/8 a j;a;xqbu7/q) k icttsfc3ound 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 sound?*d;b nczuxq30be 1p9t (Assume that all ot b n ;tc0*udpxb13eq9zher 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 4+8zpu0w 1xar4 w(rs )8ltzvzy00 Hz sound, the velocity of a 200 Hz sound through ary wxtv(z4)0w8p8zl r asz1+uir 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 6lazq kun/l/h;c zep5,u4z0y 200 Hz sound inuplz,/y065k 4hca/zqze;lu n air 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 greatia wk-w4/p(ny e58f eier 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 less than s asj6cg;*qc2vx)a,d) g3wqcyp q u 9:20 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 un: kc)pp5/gdfbvzjc-n/+bs .oiformly in all directions. If you move to a point twice as far away fromzd p/ kv+pj/5c on-bsg:f.)cb 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 diverr : n8guwp+tl8ging 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 distance d from the source is I. Whdq1eb :9:scoeat is the intensity at a distanc b1:odsee:9qce 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 frob6z h zgkm6wi.p30+bnm a sound source that is radiating equally in all directions. What happens to the 3hmzpb bn.w6ikz0 +6gintensity 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 souf .on bu1ngex ,;/z* 3gun t mqiwx,xx5i;d:i6nd source that is radiating equally in all directions. g3tig*. x nwnd ;imx/bnxfiq5u;: z,ou, xe16What 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 incj2(-jjk r x:dcreases 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 speah/.b/r wvcn5 mzyp0 1wx/n2caker emitting a pure tone. What characteristic of the shw2avb n///.y1rmw50nc z pcxound 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- q/iqw2s9oy d*lxp ,v 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" on1jx 2 -q,.+:w+ja3h izphagrc me(usf 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 airg6effbp h ;lxs g,74:h 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 displacnfrr9w-.mb 3tement 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 strzz au bwt/bj02;yy39zing and the sound wave generated by the guitar as a result of this vibration. What do these two waves have i; yjb/0za3ytz 9zu2wbn 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, the b.-.ews 6y c;1w0 6*siqmonwbu/bov fre

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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 thehdaac6 09 6/qfx.lgp c :a,cfd three lowest tones produced by this pif gfh,d q9 0ac6pa x6/dac:.clpe?

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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 t)p*a1z ;w 1;9mk5 dv nzjzbl mltc(y:Hz. Which one of the following frequencies will not resonatkl(w*a)dm51b 9zyz ;;vl t c1zpmjn: te 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. Which stayjh -y5en/ ((wmh,j9 fype0c gtement is c5wgh ,e (y(necfp0/-jm9 hyjyorrect?

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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 then 5+qkjle76pk 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 pipke 8))cnw/zt cr pth x3c3y,at::vcs n(fvn05e of length L. What are the wavelengths of the three lowest tonntrcs hcvft:85cpac(3:xyt ,e /)nknw 0)3 vzes 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 is 200 Hz.q(d7e /xn vem6gzy 8ed:d0gi1x-t*wx Which of the following frequencies will not reson vq6indegwgxe yxx0*dz8m / -71t(e:date 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 30zrhcey- a uuk e.u.1g8zr-hfundamental frequency. Which stay0 h.e-r83z.h uac ru 1kuzg-etement 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 twvdf;q , hror1h(hkoyub,z 2- 2o speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. dr ;ou(h1rbo 2fyk2 hv,q-zh,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 ssgxhvw*/sj9 4ound 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 and a particular beat fre ,) t6wq(q x7qfgjc9xmhp b+dl3 tq,4bquency is heard. What happens txq+(w4p 6dj)qqxmf3 bqtlt7 9g, , hbco 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 explaindnkre vaz+ oj(/*n d d8:yb4+bs

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approacheq+jw6,7op 2kdcpx0l2yqi 7n vs a stationary observer. The frequency heard by the obse x7ko 2vqiwpcl,dqny + 0p627jrver 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 frequenc;b1o*soy sf/ qy heard by the observer 1fbsos/q o* y;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, iam6ipbv sk+l cw*8(9db*wdr+ts half-angle will decrease by a factor of a68il wm(*++wdkp9v sbcdrb*:

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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 oec/ crf o-zt;./o: iei2icz;m f frequency 45 kHz in air is 352 m/s. What is rmoo/.zc cc-e ;/it 2i zi;fe:the 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 them17 (uqw( dinb 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 m/s, a b+ybex 52yfh1 xat emits a shriek whose echo reaches it 0.0250 s later. How far 2ebf15+xy y xhaway 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,ztva zu01awt6x6 :4me and hear 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.:cylv96gl m 65 tm5xtll7 u6hdvwuk350 s after seeing a flash of lightning, the distance to the lightning stritgk vvc6ltl lm5lmh7uud9:56x w5 3y6ke 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 ac9)j8zs-fy:-sittg l 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 2a7l0p9lwmbmb90xv h deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of soundm7 v2wx 0lbl b99ahpm0 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 4,uj-m j1jqfgis

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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( o(52oysilgr ir 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 intenmh u:8qqs(, 8n3vysyb ihd 24xsity $10^{-3} \; W/m^{2}$?

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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 .288 h6ef+grhqas2o gwf .cfhjr9 .sk70-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 g s ( w5jtlzrxb40q4k rw q*kc7ag:u,5two sounds with intensity levels of 70 dB and 40 duc :0grkw4a* rq(wxj7kz ,slb 5q5gt4B?

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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 garag /m+3uhsjbv frvc g3ny5fh 371 qgon1+e is 100 dB. What is the intensity level genrvv sy1/3c+no3 n+u hfggfqm 1 bj5h73erated 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 ab jt6u+a0;o g k5h.hq z)b6ooequally in all dire; ubhoh)q+660.ktbo aoj 5agzctions 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 radiatx2esclcb :ux.o) ( 3nbing equally in all directionsn(.xe b uols32cc)xb: 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 ayavxy; l+7wo t,0nj n+r-fa6 of power, which is assumed to be uniformly distributed in all directions. What is the intensitaaynx t la,70f6r vy+j-+;nwoy 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 ni2 v12gybd-k6m8cwk at a distance 5.00 m from a barking dog. What would be the intensity level if two identickg 8yd6-2 nkvimw12b cal 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 60 dB. xrbrn ,b 7*.;nvs2m dwWhat is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in almwnn;,b2 sr7.rvb xd*l 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. At what fl*tm*)x lrz :k-bel )distance will it be *t* l:blkme zf)lr-)x75 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 frequency of 1200 Hz. 9j aqmj/zw98 4(nht,,cn ot d/yxvhm -What is the frequency of the foud(wzm- /, tmjqoc8jth, /94nyhxnv9a rth 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 sp/dklzm+m*prk v xqs.;* 6mim9d*k8Hz. What is the length of vil* sq+mkp*.d69mk*8 m dm z;s /xkprthe 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 pio)o6 ssx)* ytipe of length L is 400 Hz. What is the frequency of the lowest tone that will res* ys)x6too) sionate 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 -s: mdahrv/w5the velocity of sound in air is 340 m/s, what is the frequency of the second harmonic?rs-md 5v aw/h:

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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 th +atc/f(l7brt e 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*so 1:osmzd;;urjh8 d at one end is 330 Hz. What is the frequency of the third m ju*d;z8o ;hs:do1 srharmonic?

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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,yptnw fmfy o- inb3)v*81 6ja end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound f-bm nv pya,)6fn1jiytw*o83is 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 temperature isas9t2f/l:vvz34t oqik f ,5tz $20 \; ^{\circ}C$. 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 iszq2/iqj)cjtk-ofn 49wqv8f 0 $20 \; ^{\circ}C$. 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 sdj /afb,j2pm qrc 77aettsdns/z8. (7peed of sound in air is 340s,7tts/j7.a /(ecpf jard2dbm qn8 7z m/s. 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 of the same length: one is open and the other is clovgdjcp* sf+3 )sed on one end. If the fundamental frequency of the open sd)v+*f3p jgcpipe 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 ofi;c6 pvjp-7pvl bf*(z 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 jp6- fb(p zvvl *i7;cpwould 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 sid3 z( e6s.5mxygoc4fqre 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, which of the fo3 .ms5oqzxg4 ef6y(cr llowing 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 44(-l3lh nn/ais + rohke;f-1jx0 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 tuning fork to tune the frequency of a musical k-k66;pcu d nc,d bplj ago2,4instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the 6,6d;-p dopugbcj k2c4 k ,anlinstrument?

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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 prodnuhpmblw(qa:b5nj: oo ;an( ; :f8x/huced by two horns are 6 m and 7 m respectively. What beat frequency isx/puq;b(; o(85najon:wlnb h: fhma: 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 are found to proq ofrrtfz/h/ug6q* u6qn/2w) duce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of rz/ fq)*h wr/u2oq/ qfu 66ngtone 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 sourcgjif gs2c.jh6 (k87 jre at twice the speed of sound. The observer hears a frecgj2jfjk s8rg7i (h6. quency 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 stationarua6/-9at dl )xoim(w.cf/3*trc ul t yy observer at oneo y/lccu. 3frl9/t xid6 ma-a)u(*ttw -half the 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 q57zvgep f,r5ho6d ds b64 e zps(,-ztof 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? (e5 46 f o,z,75e(tpv zqgddszbrs-6 hpThe 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 al.0fqjla/; e0su6u *:zkuep o t 35 m/s on a day when the speed of sound through air is 340 m/s. The cop; .ullas: kuz qu60f ee0j/*ar 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 approac3cw 0mvz/;v fzhes with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/s0wf/vz zm cv;3.

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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 t7x-y f vm)or/toward you 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 -)oxfyt v7 mr/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):gxp1i 3j cfrnk)g,h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frn1fi:c rgh)3pkx), gj equency 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 + j 8i(n.squppm- 4ldokm/h. The train blows its 400-Hz whistle. Take the speed of u. i- ns4+ qpd(8mjplosound 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 v yx f3s,67: n f2lbxo*jpsnu*from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound su*xvj3:o6 ,f2ps * blxn f7nyto 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 snexl 8yi9krxpr.g03ik w,h,u ifnyz7 :k 2l05ound in air is 340 m/s. What i2x ,gy.03zk7iwk:l8y ,5lii f09rh kunp rnxes 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 Hz7:gxr)ol 8yg2wd wv7gwa8y 8 w. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an ob:)7wx8w8 8go v2 d7 wyarlgywgserver 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 si.zs(y *4 m-v1 vk4 wfnj:lashpgnal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object splw:v.z1 y4av*n(h fk-jsm4moving?

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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 *b :0u1b quonga 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./c 0obp: (o6 mtyg8abb What is the half-angle of the conical shock wave6b:m/y0b8oo p( cg tba 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 Ma4c f2h /xwe1cm m3(z3c( c v+vbfpv3l/g3wjdach number of 1.05 where tx33/ccm3v3/vp(vl+ gf 1wead2 bj z(hw 4mccfhe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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