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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 statemenm 6 o,)bcf;mse /lk.hjau4k-dt?

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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 co6/1m1 qa j ca.wmmiot0pu4ax. nducted 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 7f6a tit 0hh:a qj0,))w0zh 9qbhterf:the0e 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 happrd*/ob/5 rvjj ens to the velocity of sound? (Assumvro/ dj /5jb*re 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, tmk2 2y/xf le.hhe velocity of a 200 Hz sound through air k h2flxy/m2.eis

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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 40 3pegq 3an3l1q0 Hz sound, the wavelength of a 200 Hz sound in air i3qp3 1an3e lqgs

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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 pr3 t6mbp3lgrgp/j69 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 20 Hz arto4q h0bb(xgv m35 uyet9c4t .e 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 uniform o p3fzhkn/i9-, o;1c yid8o:6i zwpmlly in all directions. If you move to a poiof9,mk iliwocz-/ n 1yz6p:hpdo;83i nt 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 wave p2k1 /og-bdqdyw9 0shs, 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. What is tqg73ly xbl uzo)v a km:1;ll07he intensity at a di3y; gx1l)qovlzlal 0:u77kmb stance 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 from8au /y bi+rkg+ a sound source that is radiating equally in all directions. Whaty/ikabu+ r8+g 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 distance from a sound source that is radiat n5tby:a4v3kcnys c 2)ing equally in all directions. What happens to the intensity level of the sound? It drops byn3vay5c2s cbyn 4:k)t

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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 sounv8b oo bd4gtii292j7ng5 h va7d 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 towam c/s.ywjw;uw67b gq2 rd a speaker emitting a pure tone. What characteristic of the sound increasemw7ww ;u 2/.cygj 6qbss?

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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 /u yokxh 1b *rislc j;1r(e.5knote?

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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" 6cqaw8it8o 8w 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 air into widc3-*rl p (ez qn/7hwater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wav 25mk y :ob0guk(px769rydapdes 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 sounc3mdc , fdzaom);jq5:4ab db i*3s: xed wave generated by th:qm; s4d3c moi)5bxafa c,e :bjd *dz3e guitar as 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 which is open at both ends, the a9:t.zriwoiwx0 w *k/re

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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 tc2h9f e3(dalcsb 7 e)qhe three lowest tones produceea3bel (7s)f2 hcqcd 9d 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 l:vo ((0q,k /*;71 aiugqiqc 1i y n3hmhoehezis 200 Hz. Which one of the following frequencies will nh y:/o0*cu(7ailhn o;q hi1q,qi (3 kvemez1got 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 length L is resonating at its fundamej d;n.7wo1s ountal frequency. Which statement jo7.dwsn;u1o is correct?

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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 anba;(8d 3f*osaj*fvuob 2q 58e,isz gid 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 tuu 32tz ,8 mvcu9b9rhnhe wavelengths of the three lowest tones produced by this pip82uuv9b tnruz,hc9 3me?

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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. leuzrnm 0dk(x+/c v* * Which of the *ldc+(xz mnr 0vu/ke*following frequencies 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 frequeqpp0nb0*pc/k nawr:yr2f xzc 4ek 121ncy. Whiab rrfk n:c4p0 z ec/p2k0wq1*py1xn2ch statement 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 spet-l*kj, xr ;kmaker produces a tone with a frequency of 200 Hz on a day when the speed of soukt j mkrl,*-;xnd 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 waves should hak,isjm.-4-dy(tw b4c o/cbclve

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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 soundegmyhp dx g,*/,d together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is i,mhggyx*/ ,pd ncreased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explaikum2 +zm3zmev,(e fg49e) ln 9w:s ajins

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approachesdvz b* ,f80sz0e;5omp;/jqw tk ,hudv a stationary observer. The frequency heard by the obss do*bw, 0uj h/kd,mvz;p5z8vt;qef0erver 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 stsg-z) v+ 7/gkyuhyk fy ;9biako :76jpationary observer. The frequency heard by the observer is-:yakfpbsk)h7;k7 gjzvy6ug +y i 9o/

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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-spe7vefqr1ba9 ofk ci y:p/5,,m ied, its half-angle will decrease by a f7o5pm :qy kfi/9av fceir,,b 1actor 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 u xrgv.uvb 5is :f14y1c 1se;esound of frequency 45 kHz in air is 352 m/s. What is the airbg seu1.ic 4 f1exrv ;:vy1u5s 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 of sound inzxshstyc f;+ sz:56 f. 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 emits a shriek wk o7hgjuo)fng7i)* a90hf6be hose echo reaches it 0.0250 s laterogoebig67 f*h ) )fj7n0h ku9a. 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 thepld21j bk+8g.coqq p/l;s1dlrb .3hq 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,i 2p)ss7r rqw5l qn+j58wh3ry the distance to the lightnr5 w n)2q+pl 7yi 5srj8hqwrs3ing 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 day thmsr;6 . q8xa ddg1yk(ge 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,y z,d gv,a;5vmns 8he 2.5 s later. How deep is the well? (Ignore air resistance, and assumz 5m8v,,sg;ny,dhe a ve 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 1xnjb,no epsp1o+p2b - yitx:;g i58qfrequency 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 rcl 34o nik26wh. g)fjat $23 \; ^{\circ}C$ 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 ;lsbte3 ) bh))i ,-efch aw7fxlevel of a 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 d)zc w:voetc/b jcrepz(m/8e4 a14q4of a 70-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 in8/ej7:ymeqbhiw6+o f1c ;br utensities of two sounds with intensity levels of 70 dB and ;mwrf/6:je8eiy qbbo+uh1 c740 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. What ip+1x*pg .jn evy4og b65h )oczs the intensity level ggyc1)jxnboh+4o * .gezpp65 v enerated 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 equally inw bf dgemp2 e 5b:qmlerpi/t 1aq:c8)*4ak6f9 all d4:t*rg8c pk i)e6m db:qpa9wf/e51ma eblq 2firections 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 d0b/ p 3 wq9yw0u-4mkvvz2jzfoistance of 6.0 m from a source that is radiating equally in all diremuz /9pjw- 32 wv04bfoyq0vzkctions 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 )nmux :u,rd e3e./rmcbe uniformly distributed in all directions. What is thecud),mn exe /ru:r3 .m 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. Wha65fz ro9hbk:ywh*)kpu slxx6s b4;f2t would be the intensity level if two identical dogs very close tuflbs4ks); bp :rk529yohzh66 wx*fx o 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 in2m 2v f.vo, cwfls9nfd-/ gxw5tensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equallvf 9s,d-vof.2/5c n xmg2wfwly 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 .n( *sm9:gq+t bpsclun) it 8his 95 dB. At what distance willg. schn li+89t bp( ns:tm)*uq 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 frequency of 1200 Hz. What is kx 9rb;rma.:q the frequency o k .mbxr9a:rq;f 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 harmonic of an open pipe is 900 Hz.ulhjid1u r +/2kkqb85 What is the length of the pi8hbkk 1u5r dlq u+/2ijpe?

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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 of length L . l9/kg/ el5sqocxx)p is 400 Hz. What is the frequency of the lowest tone that will skl gq)xlxo/ /p 59.ecresonate 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 o.+ -bger.1hsmtik p8 nf sound in air is 340 m/s, what is the h+ ..8 itgskmn1e-pbrfrequency 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 ctjh h +5 cah6s+od.es3;dl gc nn/m;6temperature 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 330 Hz.i(mee+8ony+y e1:czn lnn l+7 What is the frequency of the third h+ nn+e (eenli ln1oyc :8+z7ymarmonic?

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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 h9)4dxb k hayp 3twaz78ave a fundamedz4h7yx )8 aat9w3 bkpntal 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 temperature i5:jf4 drsw8wgs $20 \; ^{\circ}C$. 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 p 39)zy pw*s eeo-nx)ltemperature 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 thev5uv7*p401a7js7t mauls1 ka wxz j0 8gfqa6d speed of sound in air is 340 m/s. What is the fundamental freqt70v8 pka uus4jmxjg7a*dazq 675fsv1law 10 uency?

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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 thk e7fzd sz lty)i/:2a(e other is closed on one end. Ify/z: 7ltf( d 2a)ieskz 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 emit a frequ84ru5 bldzmb h+vz 02zht v;.uency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would sourr8 m5u4t0d hz lu b;.vv+2bzhzce 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 uhz0:zmoe337m oc9 gw by side and driven by the same frequency of 500 Hz. If the distance from a zw:hoc uem70m zo39 g3person 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 frequec+pf a1j14 llpncies 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 tuning fork to tune the frequency of avh e bj(fjd/s1,,.uz j orwg)) *irq5g musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrume fgsrjwh,,*r( v jgjo5.ze/)b iq)ud1nt?

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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 respectively n3cq2zrko- cp+)8qmc . What beat frequency is heard wczo-c)npmq ckr3 q82+hen 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 ,)ak3 kx:coovcp *;lx to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tensi, ol: ;3ocxkc kpv*xa)on 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 stationar99uozdtr /mvq b/8x66r+1y zdxsi1xk y 1000-Hz sound source at twice the speed of sound. The udzri 1x1x/q6xm8/bo 99+ 6 z dktsrvyobserver hears a 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+xjby f/ck 4)lajie( ) stationary observer at one-h/jbek4c+)( jx aiy)lfalf 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 of 1000 Hz. If a listener moves with a spe0uyr1ckaj:h5( ,h iqs ed of 30 m/s away from the source, what is the frequency heard by the obseucis 0qha15kjh r y(,:rver? (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 eb5dbz-tk2+ upk;ut l*g /nj (psas:0traveling 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 au;ndstak5bs(t0+e /gb pj*2zk: u-pl long 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 bjtcgmn. 2 7j 1 l2es4nsfizo;4y a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz a2inzljjc7 1smgo .4 tf e4;ns2nd 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-Hz7a miuae(fn c 1u0xf:1 whistle. Take the speed of sound to be 340 m/s. What frequenccni:fx0a m11e ( f7auuy 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 statyln 8xk)y8 fao21-wybionary train. The train blows its 400-Hz whistle. Take the 1oyyn y2k8lxf -w )8abspeed 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 bloqeus7pkp)s1e -mx.l g49v:y jws its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hspm:e1j7 y sle)v4x. -pguqk 9ear?

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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 120 km/h. It blows iefrbtz2.h k3td6qp;iyi3oc ;4 yq8 q/ts whistle, and you hear a tone of 400 Hz. Take the speed of sounpc yqoq;ef2 ;/3tkitdbq .ri38zh6 4 yd 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. Ass/tbl5gmbc07 h le3kn 4ume the speed of sound in air is 340 m/s. Wha3ne lbbt/0m5ghlkc7 4t is 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 Hz. Assume the speed of sound in p;7h-aj k eq 2(mkijj,air is 340 m/s. What is the freque m;- jphj2 j(i,kq7ekancy 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 object. A 40-kHz signal is senppu 6 g/1pofhkex,:i(+ e3tdvt out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How h6u dp+(i:v3fk p1/xgtoep e ,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 supersoniikz9wp z*.w z9c 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-angle of the conical shn pncsmso(5)c -o0c.i ock wave formed?ssc5(o mionccp0 )n .-

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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 Edwu6* y.r xxhgt(t82v+b7fk jurope with a Mach number of 1.0x hj6*8kb.grf(v2d t7 yuwx +t5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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