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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 i;s-ei60lvo.d- e1xk 3 gifmofalse 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 condu2 ex:tgxdh1fwsc5xx -a/73fjcted 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 sound2d9+xjqqkm8r+ rr y,g 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 idc 5x10 ;vvdgmin *vo1ncreases, what happens to the velocity of sound? (Assume that ad;5d xmgv10vc1*onvi ll 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 5;i . (yfqthhsa 400 Hz sound, the velocity of a 200 Hz sound through air iy(5f.qih;hst s

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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,hgl+ a(zb kp7 dfk1e/i7-8vsn the wavelength of a 200 Hz sound in air isg8/s 7ke -ni hzlkd+a7 bpv(1f

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequetvr6 79n,jomn/ zwr rd b/o06hncies greater 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 withm*)wpb (qk o./zx2rze frequency less than 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 dz)r;cysm oqk: f/zs- 54c,keni(g+i. If you move to a point t/zs ocmi5c 4n)k z-i(ke+;yf: sq,dgrwice 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 diverginkai )qvo(lf -s*s2db (jwt,r+g 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. What is zzwhy w -/9-pdthe intensity at a distance 2d from-wyzdp zw-/h9 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 radiating equall5g+a 7k uo4h-mrjmf*jy in all directions. What happenfga j5rju-o4+h7km * ms 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 radia3zl2tjsw t.n* k.cvv6ting equally in all directiocj3wl2 tv.t*n.6ks zvns. What 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 increases as a sound becomes loudeft(:iozo 0)j20fpzi2un45 b t(cdy rjr?

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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 emc 7-(x2 rj-sw rpu nfgn;.ya5bitting a pure tone. What characteristic of the sounrf;-urnnsa 2gp w(cb5j.7 y -xd 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 music(ab+ ovqm( .q b+w2zv1/9ppb7uyf asual 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" of a musicalsefw; u:,uuh7(u xpb) 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 gi ehm1;(yxyy(3 . jwewater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement w.fs pteerc9t)) x9(o(jug eq.j (t0exaves 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 generatcfsnvb. fzy ziwq+ ix:0:+5j6io 6o v6ed by the guitar as a resul6 czx:jwov+:sbi0nq6f.6zfi iv5+ o yt 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 isco o5+ wjevgi u.+l6fr55j5in t0(x tg open 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 wavj5+l xb:5wx gselengths of the three lowest tones produced by th x: xj5l5ws+bgis 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 kqj8wo5np;r9z wlp:) orl3k 2ns xd.7 length L is 200 Hz. Which one of thens5; 392r7o8wpdxzlklnk: )prjq.o w following 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 length L is resonating at itq6 :mfco z:egxh01pr( s fundamental frequency. Which statement is cqr e z6f:01pg(cox :hmorrect?

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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 oz,;1tvjs3;fh5w(n(yx l nynclosed 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 wavel jugxk 8/ b6xu4sys4(sengths of the three lowest tones prod/ 84ukyjsxs4u (sg x6buced 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 ixs: / (1 pvhohm ;kv0ao36svlto0vh;gs 200 Hz. Which of the following frequencies willv:m; h pvahg6 l0o/hv(s1o;v3t kx0so 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 k2x/i xl)v,v-s lj;amfrequency. Which statement is corr- vxiv/;ls x klam,2)ject?

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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 p- u4qhl;x.rmp roduces a tone with a frequency of 200 Hz on a day when the speed of sound is 3 l;rx .4uhp-mq30 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 wavdk .l* h ifwb,bh7w3b7(x0lhyes 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 frequenc dr:n9go tw0ow7dq ummaziwi(w,07) -y is heard. Wha0 gozwaido9nwwrw0:t ,m(7i7- um)q dt happens to 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 explainsf2 fql ,e mn,t/4ju( mmy.ms4b

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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 xcxwigojr 4+ 1/y(wr8 stationary observer. The frequency heard by the observwri1g r/ 84ojc(+x ywxer 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 frequency heardl:5q eo si5rl6w1, qeo by the obser6ol: e5wqsoql,e i 1r5ver 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,rpra0v- a4fd8 c0n sv-speed, its half-angle will decrease by a favs0v 0apcrf da-r 84,nctor 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 air is 352 m/s. x( qy5-vr v6bn What is the air temperaturxbv n-5q6yv(r e?

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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 w fdppg6.224m pe4fqospeed 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 spee gighw z16e+3sd of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away wghei+w13z g s6as 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, a,/9)sml9v nhpa6ev tt nd 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 5.0 s after seeing a flash of lightning, the distance to thex/-(i 9 gi)hcojw f:av lightj: /gfxiv- ) cw(hoa9ining 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 yli(wwecllh-qk0 8q( n ,sm)-from a 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 deep well4vwx c9) gxu1sx;o8 wt and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume v8x1);wsxo 4xtc9 wugthe 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 3bi hn.a2k7emt(ilze)j:9vw*bc .hn 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 at-e01z 0b 7ws/ 4 bngewsrte7yk $23 \; ^{\circ}C$ 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 sozmpp);3fvx ,qund 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-oc3psm0 1uxexp07u- cdB 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 fc(s;l qyc,9 9a3h4jr kp;zipintensity levels of 70 dB cp 9f4p9zic(q ;aks 3,hl;jryand 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. What is the i) got rht pop;ga5t, n)s;s1,fntensity level generated by one ; ,pt1ogt5asnfg ;rop s)h)t,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 ew g 6*wc. b ib d)axq4+;t,skv/qrg 3nj,jpyw0qually in 6t4s*r qw d/ibjwvgp ,+,n ;3q k.ywcjb)g0axall 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 radiating equally in u,st qlcx( +6yall directionsy+(q6xulc t, s 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 abou(wgob5yn i7r2 t 1 mW of power, which is assumed to be uniformly distributedb52ny7ri(w og 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 dis, ke zu (hrk;g:gt4:pltance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other art:l;e:zr,gguk k ph4(e 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 intmd*ijh)ar/ 73drtv g7ensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the sr37a djdv7t ih/rm*g )ource? 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.-/ae:b8v,o, kohq0g;j lt. xt1htz c c0 m from a point source is 95 dB. At what distance wilz.lh -jvtab1keoc0x:/ ,tc hg,;oqt 8l 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 s/ mop6p*lk4g a frequency of 1200 Hz. What is the frequencys/ 6m4pkol pg* 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 thi(sby- gsq9n,2b) vjx grd harmonic of an open pipe is 900 Hz. What is the length of the)bq ( ,g-vxsj9gn y2sb 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 rev f1((kn2 ep s4v yskx8pu;qbi7l 1f)bsonate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in s l)f 2beyvsb pvixk(1k8f(np4 1;u7qan 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 loes; l0/x ;lo- lv,nfhq7h hqqf.nc0o .s/w3of sound i ox7.h.3s0s ;n-lwcv ; 0qqooq hlflh/nf/,le n 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 whei7oo2 4b:/ iua0uv jnluqo0p5)no/wjre 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 pipe closed at one end is 330 Hz. What i6cdr ge53-ppi :f1 xdws the frequencc ew gd5fiprxp16:3d -y of the third 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 shortestbv/30n egx )fl pipe closed on one end that will have a fundamental frequency v/g)fxn le 0b3of 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 temperatureye n -()e( kj xh;lva24tx7n:fl.r kjq 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 /lm6iuck1rms* z-m. kroom 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 spny m1yc- 6l7oeeed of sound in air is 340 m/s. Wham o61c yyen-7lt 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: b)xyv8;5h ch jntwxboe 47z+6 one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is thyv hbx j7+nhzx ow)c5e;8t46be 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 frequgvq du+:jr7 cw;knlw(* - x6tcency of 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 obsd7 wr;q*wvcjkg l+-t6c: nx(uerver 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 theq:(eh.: 5 y wiv;hu(miriv k,0qcju k/ same frequency of 500 Hz. If the distance from a person to one speaker ireq5wv k;hk jy:qc .uui (:0i/ vm(,his 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 frequencies of 440 Hz and 444 Hz. What is 5jnxu ,( jbjj5the 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 tha px1(d:x5wh djqyzz -/in; 2ee frequency of a musical instrument. If the tuner hears a beat frequency of 2 h1pezj2(/y d q5w:znixd;ax- 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 lk ; 7loi, x zupzr 6+z9jjp5pi ,0g02d9cgqqkm and 7 m respectively. What zzu7k oqqxlg,c 0 2dp0 ;k jli+z996r,pi5gpjbeat 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 violin strings on two violins in an orchestra are found t2z txt n7ok/jb)g b.t:o produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentagttbzk:t./oxg 7)b jn2e 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 4qdi7 l 4ko6joa stationary 1000-Hz sound source at twice the speed of sound. The obseriolk7jd4 q46o ver 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) apk424b/ bofqv0 gl i5yr4ltdx 3proaches a stationary observer at one-half the speed of sound. Thv qlbibfk45t xldr40 /o3y4 2ge 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 movevdtiss :zo2t v*c2s28l gp 5)zs with a speed of 30 m/s away from the gl2 pds2so 8t5z *2s:cvti)zvsource, 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 siren. It is travelk ynpuzk5;d *,ing at 35 m/s on a day when the speed of sound through air is 340 m/s. The ca*;z ypdkn5uk ,r 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 whenq3.;iimfu6x*eimj x b9- 8wmu a train approaches with a speed of 30 m/s. Timx .m jwu6ibu 8;3 e9fi*mxq-he 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 400b4 wq/pnh26cv tq69 ki-Hz whistle. Take the speed of sound 9c kp/ vnthwb462iq6qto 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 as2d-e8(ybjpux 0 uz yr*wdk49gy w 02w4b*vmv stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s djs4w 0 (w4v9pwku2yxbgm*ud -2yz*v8yb0e r. 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 whtmt2f(i.1-w;5s pfi -csaz rkistle. Take the speed of sound to be 340 m/ri2 ifz; mtps15awsk-ft -( c.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 frohhn1tj9nxkqz71 h3 o vwhn* u8 6w+d6am you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s wtjuaho 31 wv 6kn*hdnhx9q+h617zn8. 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 sxtva7,d m6o4 lpeed of sound in air is 340 m/s. W4x oamdt,67v lhat 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 tq0g bom8+c7 ygiq0kg 5rain horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the fryqmi5c7 080gqg ok+ bgequency 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 objencm/7q;xkk p2az 2m+xct. A 40-kHz signal is sent out, and a 42-ka mcxm2+ 7kk xq;npz/2Hz signal is returned. Assume the speed of sound 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 conical shock wave cwyngox ,b )uhna6iz+.lfs )k1y5/5u 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-angle of the conical shoc,vu6+ -lzqzvm3,f/ 7 wmibwocrel1j( k wave forv3uzfowze/mw r 7(+ 1bqljv,m,i6l - cmed?

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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 4py nbjv pl f7xtdy8;4dq;- 3zto Europe with a Mach number of 1.05 where the air bj34dty 74z-pqvd; ynf8 px l;temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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