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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 f9 a4egq8pjwhv5 ( ifaj*kdar0iqb7.9 alse 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 conducted fastest throux gqvb8yi49*s7 ;f0 jvsl,dy igh

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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 soundcj9xza yk* t:x)n lb0u.0j1 er 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,k*ddmz* :0 hsq what happens to the velocity of sound? (Assume that all other factor0m*d* k qzd:hss 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+embl.np *a/j sound through n*a. b /epmlj+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 an37kx0 jt1zps/7xb3ee rw4 yw 200 Hz sound in air i x70ejkw317p syx4t3bewnr/z s

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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 Hz a( ob l+0 m2-2bg4iurs obqvv4are 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 fruv9 w+i:oo v0y0se/dt equency 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 emw(dhe0o-v )wd6d *2xu gf /ctritting waves uniformly in all directions. If you movetgw xe0-dru/o*vc2d 6 df h)(w to a point 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 waves, intensity7iqvyga:k7m 4 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 hk2z-c;3wp1yt3wafqgt mjc*g a2)d 4the source is I. What is the intensity at a distance 2d from the sourcagf -c1 2w4jt2g 3 yktpdawz3;cmq)h*e?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distancl q:k(ugq;q;z e from a sound source that is radiating equally in all diq(k;:q gqu;l zrections. What 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 sou9n80ry6r1 q jsmu4bp kbufg5.nd source that is radiating equally in all directions. What happens to the intensity level of the sound?f1m5rrubqn y.6kj0gps 49 b u8 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 becomsj/9 ,n)-bd:eqpd nhees 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. W 7dkw+o9 3kteihat characteristic of the soun k79w +kide3otd 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 ;)jdygy46p3pr4; pwfo 4g bl;w8dgwsal 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 musical note?)m,v:qy+sz2e- vr eie1eq6d u

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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 /jp2ji 6. dlpaair 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 displacement m .aw+:gbokt aoh397z 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 string and the sound wave generath xo x,uq4+df;cf0d*ced by the guitar as a result of this vibration. What d dc c,;0xoudhf*f+4qxo 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 wc :uyty6,;yj6ffx m :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 wavelengths of the threkw.1w0r eoqccmy/(; z 0ij8s555ztmw bpsd; ae lowest tones pro .m(5 azwc;c0 twq ;yokbdw5pr0 iz/5s1 esm8jduced 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 is 200 Hz. l 74a( sfm1qda Which one of the followiql1 f daams47(ng 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 -4e tn)*c,j+ahefyt v/ -fz rqat its fundamental frequency. Which stateffvt/yhj* ct)enz - are-,4q+ment 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 and closed at the oth .p.f hyfo 402)mgzyrder, 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 pipmyza)q0dok k,p :;op: e of length L. What are the wavelengths of the three lowest tones produced by this pq oo,z 0apm);dkkpy: :ipe?

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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 cleb62nz;q z +h9zob c+mosed pipe of length L is 200 Hz. Which of the following frequencieez;2 m ohzc6++ zb9nqbs 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 7: ufecf0*2 nljc-wtj at its fundamental frequency. Which stae f7n0 :w-cjtf luj2c*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 twj,ew.6t t jt dj(uu1nb,0os5lo 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 nu16 (lts0j5b,oudtjw,e jt. 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 h:v*t 2gxp,ayw ave

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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 ihfklzh;8i 0 5ws heard. What ha0kl fh8ihz5; wppens 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 explain/wj zh 49r1z:x+irvxt s

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approache:b plje3ib8w tk.uyh67 k,r x 6fite2)dxr0s6s a stationary observer. The frequency heard by the observe2xk3fp. swudrr6bl8xy6,: tt i eik b7ej60h)r 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 staiv.8fb,xhmqr8-m 2 s ttionary observer. The frequency heard by the observer -vr b2.8it m8sm xh,qfis

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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 decreasry 9,yplv w26n*qe.))cuiafgi 2h* rse by a fv2is yg)rp cur2i. ,qlaywn6hf* e*)9actor 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 ultrasgt)q*w2b )i u9b(og tzonic sound of frequency 45 kHz in air is 352 m/s. What is the air temperatq )t2ubib(towg g)z9 *ure?

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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 4h fbifs x(2h-9j5pu gin 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 vuowbr b4jjbjq * 22 9+1xndq3sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s lj2dvu9bo3 b2 q*bnwj qj1x 4+rater. 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 temperaturv34 ac kz1)wqso* kr-ue 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 lightn6r .da ao4;d-x r.nyjving, the distance to the lightning strike is aboydv. o d6r ;-xrn.ja4aut

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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 t2xiy0eaig6p,oxxe: o6 0 c0ex he 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 hearkb1a x7b*fvh 2)xp.atofn:jav * nl28 the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity nk2h1.fata bnb7)2*vfxj8 *xpo a :lvof 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 frequencyitz k /* tl,,j.ectx(c 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 3-kmphj. w6 ;,eqaxqd 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 i q r.qt,gjqq.p,r5v +ayz/1xqntensity $10^{-3} \; W/m^{2}$?

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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 0f igd7-9 toe1 qbozg-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 th 3 k7r:(jnh 4u5hrehgae intensities of two sounds with intensity levels of 70 dBaj 3ehgh(huk r47r:n5 and 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 inten0i gecj*on ftkb11(;hsity level genera(1ckn0h ;f e*g1o tibjted 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(i2/m*uqr6h f bgnp/3+z.zpl -i i ;/wox emfu that is radiating equally in all directio*bpw l .fh ium/fnx/ugzi2r +zm (-6qo/3e ;pins 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 rnqh91x mnn +q o,wxogs7,+b 2that is radiating equally in all directions ib1,9nxnghm n+qw 27x o,+qsors
$6.0 \times 10^{-10} \; W/m^{2}$. 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, whicx.o)i9u*qvww h is assumed to be uniformly distributed in all directions. What is the intensity level a9)o.*wvwx q iut 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 0 mzv ybxze4+7dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to eachm4z 0+ybvex z7 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 1 +q gatj wxvkwa ozf7)21kyis;;4mx-level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the 1m-;ow kg1t)7y z xa+wjiks xva;q24fsource? 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 5.0 m from a point soug,he8 h y64.getmrq cm; : 3hzawfv-5drce is 95 dB. At what distance will it be e y 8dhm:camz;5r-,gwf6q t .vg3hhe475 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 the-* 5oo3s/ at47 k rknao0dfeqfyset/ : frequency of the fo5e:nkq*r7o fy4tkdosasa -/3ot0f /eurth 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 pipibb 3* hn*73 7yjcsffce is 900 Hz. What is the length of the pib nyis7 fchb3*3c7*fj pe?

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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 resonatee: j9tg(3 r mcxi1vop9a c,qa; in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone t;i 3x9qcpvcoa: ga mj 9(e1,rthat 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 end69 )keu ahys(fs has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of tyka s()h 9euf6he 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 thzd:2nrmy-3 lu nev40i 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 at one end is 330 H +dk f,dc5tq); jm)xo8.do9 pjx i/ffxhv83 brz. What is the frequencq. )o rki fd/thp8vff ,b8;cx+dm39jj5d o xx)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 shortest pipe closed on one,lg:(8wz :wr zsv d/zd end that will have a fundamental frequency8rz: ( d,wvz: z/lgwds 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 tempera/srt(yhbh .-40smou;/ quqps gfc m) +ture 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 roomqhc1p+13 3 wg- di l) ue5x.ifutcmbl8 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 ls2e)mb9ei(yn; 93h.qsxtwn 8a7l ai of length 0.75 m is played when the speed of sound in air is 340 m/s. What ise mhy97l ti 8q.)a3sb9ixsl(ann;2we 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 thuk c7s;6up:8(jgyv,9qx vom ve other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequencyugovs, 8y69 m 7vcv u:x;pkj(q 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 velo/ j-(a, xdr hiujbi;j4city 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 would hear noi -/h4 j(a dxj,bi;jru 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 frequjgfyqf1t- yp(h75 -brency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, whi7(f-q-gh f1jyr bt5pych 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 frequen /h;zvvebp :8-xc1w: iym,y jacies 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-fm.09j wha bai)t s)(wHz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the f fawh (a bsiw0).)tm9jrequency 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 soundk( cg;5xg0p 9cwy5j-umry2 pws produced by two horns are 6 m and 7 m respectively. What beat frequency is heard wwyrug0wc-(xp mk5g;2 p5ycj9hen 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 :i nvj2 ji(77 .ssglmiorchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tens7 igv . lnj:smiji(27sion 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 stationary2jn qlg4.: ylmo1a :hp 1000-Hz sound source at twice the speed of sound. The observer heqohpm:gl:l1 2. a4jnyars 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 stationaryk;3dt-jc x:6o+ f om1xwqq*ce v(s( po observer at one-half the spe16mdc;+op:j tqo3*k fxo x cq ew((sv-ed 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 listizu;s*u0u rm myh3q5 )ener moves with a speed of 30 m/s away from the source, what is the freqh0q umsyiu5 *;u 3m)rzuency 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 the s y)*3mooez 0izpeed of sound through air is 340 m/s. The car approaches and passes an observer who is standin3z* 0i)yoemozg 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 ud.tk9 ukwa: ela6:d73u 2 trsheard by a stationary observer when a train approaches with a speed of 30 m/s. The frerduw kake2l9t: d:s7t63 ua u.quency 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 4000 ux(huc/ .ryk-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do your cku h/.(ux0y 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 tr:jq i *b: lm7kclkee4z8su6 1hain. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearu8 zi7hk::l bsmle*6jq4cek1 ?

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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/hgu3pu)b)cvj m z/(r1 h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency dg1r) c3p hujzu) mbv(/o 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 athvu0(c y-ky 5v 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take thev(0c5 h-ky yuv 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 Hz. Assume the speed of soiynlzx6 /:wjkw,4 3pmund in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a spey :w/zkml3, ixjwn6p4ed 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 :w3 7humy xot/e qa6p,air is 340 m/s. What is the frequency heard by an observer if the obserutoxh a, 6 7ey3/pm:qwver 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 sent ,ax ,dw5o5km 8)nnszsout, and a 42-kHz signal is returned. Assume the speed of sound is xsz8w s)d, knn,5o am5345 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 mhdh57, d8 q ry)5viikdgq9/eproduced 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 s8alh h d2fnp:*z-;ba vhock wavdbh:*; lv-8na2 faphz 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 Europwbdbv(y/ d/ e8+ zlq4f;l1hm04gaupje with a Mach number of 1.05 where the air tempe/hjlaye1dv 8(bq;wgbmp d4u0f4lz/+ rature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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