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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: 游客未登录  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 stateme ;bbz3c yl1 8u ,,:mim7kcglaont?

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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 througjhvpa j772.mz h

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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*4aial4pf0 czbfe48g 9.c +km6 mwfko 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 h 6 szhfeq(vcu1e+r*.uappens to the velocity of sound? (Assume that all+qu( *er6 .1hu szevfc 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 200 Hz sounc.kx. 2k qo;s*w f4rckd througcx4cqkos k;*..f k 2rwh 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, the wavelength of a 200 Hz sogd n eouxy-*-p i(/jt;und in yp -oi /-tjd;ux*nge(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 greater5t/zotia hu;r-zl9h4 gh;km , 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 20 Hz arxczw1+ sooh+y5xjq cy 0 e)y-6e 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 direa:0ff xdf ewj7xlki+hum *g: og)j/kq 3, 3(tzctions. If you move to a point twice as far away from the source,:) 3fkqtj+ ( kgagxdhxlef fi*umo 7 z3:j0,w/ 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 waves, intensity i7 e1 .4d / d ow)tu1pfnw2k8vazyllh83kdayb8s 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 lqh(4idiam+ syz 03x/is the intensim0aliz 3x +yhd/(4 isqty 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 from a s/bpvedcwv/r xl 787v*ound source that is radiating equally in all directions. What happenwed cp7 l8*rv/vxv /b7s 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 equ7(q(: w3 hm (6bexh)l 2 o denmpxpjvkjc;0)bkally in all directions. What happens to ne;x w me(kj c dbop76lx)v:0(p3h)k2mjqb(h 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 increases as a sound be27/zpq 6*-a yyd6 y vavdzc(llcomes 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. What characpqgmukwx 20) ecw28+ eqwg8g-di95clteristic of the sound ine)-wix2 8g+qkp2mcg5 euq d80 wwl c9gcreases?

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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 lx n)p u1kkn9*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" ofv8 b6 eet1 puc5z,xtdfk,l1p9 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 wyu2sf,lyk mcy9x 5q z0h58pj8ater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waveg3 qq,6oph xuh qo6*3ns 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 sound wave gp3l+rxy isy .9enerated by the ir y+y9l3s.xpguitar 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, tmd*vmul0qw)/:,f ftahere

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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. Wo(-p4/ v j tzl2bxx(dyje cop7h)o-1xhat are the wavelengths of the three lowest tones producebvxj4p7y-(( x j/tol 2op z)1ec-ohdxd 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 xdr1 0szr/myp-,p v)d open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in thvdp -ymd /1x )s0rr,pze 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 leng5mzl4o*d0y gua6f* olth L is resonating at its fundamental frequency. Which statement is correc f4o*mgd50ayu* zo6l lt?

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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 oth wh.3r lx ev0ny4wt+j0er, 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 dt 7/ors+x h+n5u2kga the wavelengths of the three lowest tones produced uka/ d+725tgx+ro nhs 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 lzp p zc3+bw56xm zsyp0h)3h3e ength L is 200 Hz. Which of th5m sh6p3)z3+xw zy0bhppc3eze 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 e,f8zu0 5m(7sn d lcfyvnd is resonating at its fundamental frequency. Which stavy5fm0d7fcusz(,nl 8 tement 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 drive f jyibou5d k;us1 *vsx5ipf6o-5d0e*n by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when f50i-5;oduu os1 yi*v k 65jf *spedbxthe 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 waves shoul1wsouxbop r4efhf-0( bum 7(tc2,qw7d 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 frequency is heagju57*aqgpoo+n ) l z7rd. What happens to the beat frequency if the frequency of one of the 7q7 u napjgl)*+oo5z gtones 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 explains-oyf:zd ccz 6f6r4 g:g

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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 frequency heard1yz3j.p)i sfhe7y td4 by the obsey 4) 7hif.e pzsyd1t3jrver 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 fr s)3q2n6 saqktom a stationary observer. The frequency heard by the observer is)3 sk2 aqnqt6s

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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 dou fxdxrl1weu:7p (s 4/cble its MACH-speed, its half-angle will decrease by a factor off7ewc/xx l ud4(:1pr s:

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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 frequen/rx- 2pxzds 9flsoa 4.cy 45 kHz in air is 352 m/s. What is . 9lxxos2rasfp4zd-/ 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 the speed of sound in air at qy 75pt9,u 0venif wl,$0 \; ^{\circ}C$ 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 itnrqa-f6 ycrhy( /-z ,s 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was th-/qc,y fz rahr -6n(tye 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 echor thp ufb/3hg2g/n9 j/ sih4k2ml,e3m 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 7cuj 0 /ljm*d.np v;rk5.0 s after seeing a flash of lightning, the distance to the ligj7uvdcp0;*/ jk. rmnl htning 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 the ; 4e czwwomi2)kg; ma/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 2.5 /w.d,rpo,r0npo )c q rs later. How deep is the well? (Ignore air resistance, and assume the velocity of )wn0op, or/,dpcq r.rsound 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 ai b k8kx1 - g*cmpih6m xbke8o,.:tg;sxr of 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 air a55 8oj2tx3 hqf,zds jvnqh+7tt $23 \; ^{\circ}C$ 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 j4bi+yym 3mx 5l1fg(k5)imts 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 ap qi12r+2k p0o8fdf+ u9p)pdk yqjzz 6 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 intensities of two sounds with)ur:xsj de5 3x intensity levels of 70 dB ax du3es5j rx:)nd 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 garage is 100 dB.gsuq)ylxu 3cs **/y0h What is the intensity level generated bsqs0 y*u/ hlu)x*cg3 yy 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 rv(lal)1 o8bh5kgo oh tv1c /d:adiating equally in all t:1k5o h8doohblva)g1lv/ (cdirections 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 radiating ffp .uuai; m-nhm w/i-:0vckg)d9bd7 equally in all direcc.h-)-i gi:fumn vdw /7 d90fa;umkbptions 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 ( k51( 53osbhwchw8k5 ecgleh ii)v 4rabout 1 mW of power, which is assumed to be uniformly distributed in all directions. What is () h5bo5 (e1ige3 5hck v4chrw silk8wthe 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 fk5xwass5;c;wz eknx1 sd)fe:4f, bw 5rom a barking dog. What would be the intensity level if two identical dogs very closbwkfs4wed1wx;,s5fzec : ;5a) k x5s ne 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 souzxmbz*p pxcqaxg u/1*b4j*(oa /*a5 orce the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiatescza*jxoox *zmaq/ gpa4bp **(5 b/1u x 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 fr93nj y9etksv9 e apx;0om a point source is 95 dB. At what distance will y9a9x;pn9 eetksvj03it 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 ihm/f9hpkh.al q+* *2fmx) t mjs the frequen. kfx)/h9hj am+2lp tmq*hf m*cy 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 harmonic of an open pipe is 900 Hz. What isz.oau gs 8ld(.nd(+gi the length of i..((8zsdoagg nu+ld 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 resonate in an open pipe of length L is 400 u j, pcs78kr.)mx hi(gHz. What is the frequency of the lowest tone that will resonate in an open pipe of length mik7pr,g 8 hx)c u(.sj2L?

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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 ha-u1 8hwb c6bd vpi0g:ls a length of 0.80 m. If the velocity of sound in air is u1bliw 8:vp-b6d ghc0340 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 the38g8f-s cdi 5+1wam i*rsus qe 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 end is 330 Hz. Whyq;g(kjqk9xot0d; 8 n/6ho elat is the frequency of the third harmo; ;qnl/9 h08d6(kgookq yxt ejnic?

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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 2u6ytoiej2 8(r-mur16)( r ui0m v nrqcprnn. one end that will have a fundamentu2 16q8( -ipmnmr nu(rrocjyu ri rv)en.t 062al 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 f:3rknx r s5b9where 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 i-p8zqtcv- /p: b3y pkjn a room 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 length 0.75 m is played when the speed of sound in airrzaq,f b zo (/t4kp6*g is 340 m/s. Wqo6 ,g bzr afk/tp*4(zhat 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 clos/m-k.e9f h uc4 gik+- tny5giked on one end. If the fundamental frequency of the open pipe is 300 Hz, what icgukgk 9-+iy4h-f/mtkn. ie 5s 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 f-+,o5iwxhik;b (lv2ixw t c u,requency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther backikw volbcx ,,-withu2;x+ 5i( 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 frequency of rc9t9oo m,iyutxl-+ / 500 Hz. Ifyr9u9+lt /otx -ic mo, 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 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 frequ* -2w.dr.5n0k lnceuubl4 zrzencies 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 a musicaxm yvx pk1+bcg9fsumd(mo **+n ub00; l instru*y gds kmmp9cuf0b* bu0(omn ;+vx1x+ment. If the tuner 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 +k+dzs vli b36horns are 6 m and 7 m respectively. What bea3 6bks+z +ildvt frequency is 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 visbsqz xgl4 f0: vs(d6+olin strings on 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 strin6s0 dzvg :xqfl(+s 4sbgs 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 statis:;aird-) pfgonary 1000-Hz sound source at twice the speed of sound. The observer hears a frequenc -df;r) sagp:iy 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 (normalopn86r- ghn- )nad) eo frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequd )hpn6 -n a)n8rgooe-ency 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. zgq16 q*:e08 rh sguzr2bow+0v6x b oc If a listener moves with a speed of 30 m/s away from the source, whrqrs *bu8oo:0qh c6wz0zbv gxe6+g21at 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 when t c+/.6ec txckq)edd :,dkq3eiek -z9av gbx- -he speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside.d vbc+ce,k :c qkddex3egq i./x k-6z--)a et9 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 i:+gr 7f1antmheard by a stationary observer when a train approaches with a speed of rf m1+7tnai:g 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 you at 120 km/h. The train blows its sg a-zcd* 90kfhtzj+ng 5p87q400-Hz whistle. Take the ghnd*f5 p +-qzzt 8k07 acjgs9speed 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 tuxg;p/k o b/j+ 6mjd2srain blows its 400-Hz whistle. Take th kosduj2jxb g m;6//+pe 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-Hx;k/d*a;fno)gw ,)92xy 6w vjcxk piyz whistle. Take the speed of sound to be 340 m/s. What fre6iy9)kgdwpx ; jyx ;2n,f/v *ax)cokwquency 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 120 km/h. It blows it t*,jema5kq3y s whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s.e ymt35kq*j a, 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 9f8cu6j1o:k 0w 1f c/irbgclx is 500 Hz. Assume the speed of sound in air is 340 m/s 0l9w1ork16fugfjc/ 8cxbic :. What 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 s-7lw do,ooa1ol yyweq 8,e:(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 too7so l1y oql:w8ee,y-da ,(wrain 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,q3z vwkl7q brq)cuv)6-7qq h is sent out, and a 42-kHz signal is returned. Assume the speed of sound is rhqq k)cvwq7uqq6,- vl z3b) 7345 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 conical shock wave produc4; ldq zpbo/a(xt(7 uced 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 bbad26eks -b1 of Mach 1.4. What is the half-angle of the conical shock wavdksbe-bb 261a e 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 Europzzkct7 jm7 e95kl4wkj ,i:h 6ye with a Mach number of 1.05 where the air temperature i5c:ml 94kkhez,7 ktzj67 jwyis $5.0 \; ^{\circ}C$. What is the speed of the plane?

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