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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 * i qu n(y2xcn.r1y2fjis 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 conduy rir+wk*c *hxty0,o;jpb 1, ccted 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 yl/.iw+;g kimt:* y3kvcna0y?

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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, whu( s+ tllbyd5xd+(4ryat happens to the velocity of sound? (Assume that all other factors rem4ub (+r +dlly sdy(t5xain 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 szg,*qplf6zy. x73 srwound, the velocity of a 200 Hz sound through zy6rsplf w3gzx7, .q*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,j8 a4af4 bk+j co:5is1bzo1hi the wavelength of a 200 Hz sound in air i :z1oc ibjb khj4+sf1iao845 as

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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 thafda(r ju-nh 9ghqyf+ ;.f1xoo4 si t5+n 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 than4/bf so drm73j 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 uniformly5fzkl1i+:hj s in all directions. If you move to a point twice as 5jikz+: h1f lsfar 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 : -x8wtw/axhg0sei-9gj9zlv 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 thgl 0swazi 3,5we source is I. What is the5ws3li0 gwz, a 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 as8m;b uxw2vxrv)41a*rgy l;s+5 czrfrom a sound source that is radiating equally in all directions. What happxg1zrcsuay + r*;5 r)sw; 4vabv8xm 2lens 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 that is radiating equally in all:i8feb lq0*7vys iv 2vckl3v9 directions. What happens to the intensity level of the sound? It vlv l0bsk:iqfc987*ve y v2i3drops 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 increases as a soundd7 y7ung;x8.o *fypa v 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 wvahm,s24z+ uc i3+ efq 4.mqboxo/1ux(tf8ppure tone. What characteristic of the sound incre,i p4qb12 qvmc +8zu ousxax/3ef.+ 4woth( mfases?

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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 musicam1xe fu rm7ggg o 7-6yum;p6 dy4h3j5sl 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" bick1gfm 4(5v 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 from sq3t5p3 tj+vo 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 displacementtax;n 3xtdg1ihx /* .n 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 strin8el vmd 7,oboem3/q b58 i(rqvg and the sound wave generated by the guitar as a result of this vibrat eq7boe8(d mmv8/,ilo35 brqvion. 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 ope;w*/d;ro1: yjxti7eqvo.z 1zw vsh3bn 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 wav;lbg/4p.( ubasv ny. ielengths of the three lowest tonebn. bp/4 ls(u. i;avygs 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 a) 6avck ;.pena;p a)ypipe of length L is 200 Hz. Which one of the following frequencies will not resonate in tac;6; keyp)apan.v )a he 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 resonatingq;/ret 41cs d0vx3irk at its fundamental frequency. Which statement is corre 34se1 0dv/ix krqctr;ct?

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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 gsj8/xpun23 vat 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 length L. What are the wavelengths of the t1a rz bsrx399s5ij3gphree lowest tones produced aszj3 99rr i x1sgpb35by 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 cb2,k. std3or200 Hz. Which of the following frequencies will not reso2 3tos.rb ,dcknate 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 csq+3z8 oez/krthk4e( losed at one end is resonating at its fundamental frequency. Which sta +38krqzos/z4e( tek htement 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 samem+ zko hg/q*i5 source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. 5qmo/*kghi +z 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 w5(n igbr6zw x6aves 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 oa/ .rwv7q sm8frequency is heard. What happens to the beat frequency if the frequens wr 8.oqa7m/vcy 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 explcp1dpip8zex4f,la)00c mq u6 ains

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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 observeyrl n+8so/d +pr. The frequency heard by the obsy +nrop/ ls+8derver 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 obse:efjx,(/g , 1sg8 v5jxoebz gl ,b.oibrver. The frequency heard by the observer isbfx8e jgz:x,5jlo gb/ v(i 1,beg, os.

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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 will decrease by a 89i8hs4uq.p e,n wwg j8 wqwn9ighe,jp8u4 s .factor 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 ar*ct8 x3 m /ws*ug.hykir is 352 m/s. What is the air tempegw3h y. /* 8txsukcm*rrature?

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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 sound in air at :idgzfp 3:- hc$0 \; ^{\circ}C$ 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 f2ictk1/eacf2 b 0x1yy1o: df emits a shriek whose echo :2dkcxoyf b2 cf0e/fi11ty a1reaches it 0.0250 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 hear the echo in 4.00 s. The t6* sct 5*2 6yhwkorgtmemperature 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 ox ,7h p aw-i7rpjx(wzupd0,3 seeing a flash of lightning, the distance to the ww 7xr7xz i0p3pou h,-,j(pdalightning strike 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 dp *vb8bck:if3 ay 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 a1u/tx/ir0 b mz7e2kbi deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the veloc/102 /7ktiizr exbmbu ity 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 ok21 9gpyo92ei.) x(fca eyl jdf a sound wave 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 a c3rsd dj/evd35r3h43 bgrmj9ir 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 int69lkp r61w9xqo xrcm mg:j4 d5ensity $10^{-3} \; W/m^{2}$?

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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-dzf ( wh4o1 0c2g8mbsg 27ldqqam;x kh+B 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 intensity ;rmul8 8;hvlnlhe f -j omg;jh:xe :+4levels of 70 dB and m -l ;84h;:h:f n8ul hroxl mge+jjve;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 bk6v s69ww dduxtc4r2ya3v jx+ gs)2 g7y 15 engines in a garage is 100 dB. What is the intensity levy 7d v wck6awg)4u3ss6t x29v+2rxjg del generated 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 mh-6dv: g6+evn/v,w uf*zoqqequally in all6q hn*+ovzm fu eg,6v/d-:vw q 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 rxgd on *zh.0) zp g59+* nf8k9xtalxdgadiating equally in all di8p5h).kx9xtg9fg na +d z xldgno0z**rections 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 uniformly fq /w6y-,fdw b/i2hn f fb)g8ydistributed in all directions. What is the intensity level at a distance 5.00 m,ydf w/-)/ nyigf b2 qwf68fbh 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 -mrp0b ):t8kbqkcp0ea distance 5.00 m from a barking dog. What would be the intensity level if two i tmr8k)b pq0eb-0kp:cdentical 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. ;sx5u2+mjw1ep ) 9rbf jpvw9iWhat is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in 95e w2j;)wur9x pm +f1bvsi pjall 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 egt (qi4k0x s+level 5.0 m from a point source is 95 dB. At what distance wili40q +gxestk( l 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 complex2qow1 34zfqn;dl0mzaw d-+x hia ;5gf tone has a frequency of 1200 Hz. What is the frequency of the fourth harmonic?zf i5 ; xa+4ofgdal1dzq w hn3wqm2;-0

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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 2fx3(/ qku6y wlrkz)w open pipe is 900 Hz. What is the length o3(6lkxuy fzw/ 2r)qw kf 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 resonateb s+,csfl 29nk in an open pipe of length L is 400 Hz. What is the frequency of th2+bs nc9,fs kle lowest tone that 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 )w; hv vbmc6v*n,i(.rm tr*ngends has a length of 0.80 m. If the velocity of sound inn)vv.n *m rcb v,ghi;r6 (mwt* 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 a room where the temperas/ hdrd 0yagu78pj 6z-ture 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 pip55acwrpnsom, )l 9 s/i 6hi/h6rvcbs6e closed at one end is 330 Hz. What is the frequency of the third harmonic nawchbi cmsp5i5 )l/,/ssvhr9 66r6o?

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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 shortefi dso.w 3)6yratk -x tqk 37avadi,7/st pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of f,x-r at vas iao3tk7d yw)d6i/3k7. qsound 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 m8e+x u upiu.j kjjt9tx-foht/fxa9.9+w( .ia room where 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 temqpj)rczk6n )koem7 7*perature 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 plgrx7 *v5(mrmd/vb:04kffb ;u5hq pq cayed when the speed of sound in air is 340 m/s. Wh5q (4/pq;mvfr*0vmx u b dcr75g:fkhbat 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 t11a0m bby8p3afsq h, ohe same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, wha1pb f1qba8a3hsy 0,mo t 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 velocity 35zh6gyn0/w-l plx17x wv5y *uzclc uof sound is 340 m/s. How m/wlz3vxz705cgn*lypux6 cly1u 5 - hwuch 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 driven by the same frequz5c h/ b gn+iyupx;:7qq;a )bh/ocj j4ency 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 disjip5:n);boj quq y/7hz/g+; hc4axcb tance 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 is the beat frz;z zud;aj;d 9yqk v55equency?

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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 musg(pn,7g 6ex8 3ycewy b3pgq sau:jy-4ical instrument. If the tuner hears a beat frequency yg7gb gj68y ya:pe n3u-q3wpe4sx ,( cof 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 b 7aj o:egx,a:and 7 m respectively. What beat frequency isge7bx:: oa ,ja 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 pllsdnm2w--1r1 8r* pli -mnxfound to produce a beat frequeipw1m l8npm *-2r-rs- n1xldl ncy 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 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 sg3-yo:t +-. :tqgxs m,bq0 r*chslcizpeed of sound. The observer hears a frequzmig q.*: +ybr hcg-,tcso:qx s0t3l-ency 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 observ(v4y* p.,w5w9rfaj.fwl ag kxer at one-half the speed fj gk .*5pwxafvl ,.a(wry94wof 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 of 1000 Hz. If a listener moves with a speed of 30 m/s hvk (f/eb0 +z rh4 uj0gxx3t.raway from the source, what is the frequency heard by t0 f 4z0.bhxuv3erh/x kj+r g(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 osetzd09f)9, /j exmxa 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 ofx)e,xs9/zdm9 0 o etjf 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 approaches wiq1)6 :x3 c0v-uekn/clrg cknlth a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound i6:lkvc eckl n 3c )0gx/nr1-qus 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 ny- pa n)bg:)j qzleh,66k+coyou at 120 km/h. The train blows its 400-Hz whistle. Take aknyb,h6)o-jcn)pl+ :zeq g6 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 train blowscc/ie-0g)l gkkp 5.wc its 400-Hz whcg-pc )wk./l ki0c ge5istle. 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 away from you at 120 km/h. The train blows its 400-Hz wh,:)o. de:vfkmij qr /5z72bkdnr 1aymistle. Take the1ek.jraf/i 7oq: mk,r)m2 dybnz :v5d 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 aw big21 i es v6s*kum.4fu 8-xnozqyy()ay from you at 120 km/h. It blows its whistle, and you hear a8g2f(isyy ove bun. m41) siuz*xq 6k- tone 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 H ojfd:vbfs xo. c -+y-x).j,trz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if.vt bxyr+oxcsj . j:d)o-f,-f 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 Hz. Assume the speed of sound in aim5oimz3+4p+-p b9gjjmf r 3 tkr is 340 m/s. What is thetbmr5jmj 3 fi+49 kz o+3-mgpp frequency 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 ev*bh y;ru;fk:(uxy(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 mo:hux *brvu;( yefy; (kving?

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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 c6p;dt9tsyg2s e9 v rajf-mx 5-onical 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 halq/ 5 5q5r0hsp;(rb cumgx*y pff-angle of the conical shock 0qrsm5q* xghcur/f55b;py( pwave 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 Unitenu.ymv; ov 2 7lwyxf/8d States to Europe with a Mach number of 1.05 ;y.w m7/vyvu o2lf8xn where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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