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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 is1 z;.+tp vc 4ywpceje; 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 conducwc9la ghsdk(t8e k 05wo)d-z0z2rc8 kted 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 sovonv5u48iu 2x-wazh f6:r pt4und 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, wpyhqo. ec1. a7hat happens to the velocity of sound? (Assume that all other facto1c q.aepy.7h ors 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 H l n+tx,n4 bh5lr.y*jwg g,i8fz sound, the velocity of a 200 Hz sound through abxn ,lg fw*rj,ht45 8iyn +.lgir 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 zin bkr;s1*k.r/ k 4rpsound, the wavelength of a 200 Hz sound in 1b* ;i/zr4kk .sknrrp 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 greater than 20,000 Hz are lp7))yfxv;z+(gd b tx;ij w;wk/pwf3 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 f0j+f g ngb.ys;requency 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. e/m s )due88i +jfw6spdkwe (7If you move to a point twice as far away from the source, the frequency of the sound will be7p (sum/6f ek+wi8es)ddej 8w

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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 isopttd :e ;z:yvyzw* 8) 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 poinb f1dr7 r(i:/ es 3eujapcq6,tt source at a distance d from the source is I. What is the ind73aup(ct ie6 fr brqj:1/,estensity 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 sbt7h w nfp; b;)ir6r7oound source that is radiating equally in all dir7i;) ;ptb fr6bn7or whections. 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 sound source that is radiating eitf6;lfmg h5y)ho/+o qually in all directions. What happens to the intensity level of the sound? It drops hl iof/) gho6;m+ty 5fby

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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 socq4(ybi z qd.*und 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 pu ce85bag/x 5-0c cau9 utuwfi1re tone. What characteristic of the sound 5e btf8aiau0x9u-u/1 g ccw 5cincreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn5 w4k hd t.5fb 7/hhujax6pld8ess" of a musical 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 n49 4eehfpg dhek3-p po 4g6d4a 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 wan cz s1ez**p) cqms15oter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wahqaj- mb2wt 0hw) ec-)ves 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 azpt2dq1/zwpvnkm8 :/ sva .n, guitar string and the sound wave generated by the guitar as a result of this vibration. What do/p8n /d : 2mwzpqnt. 1vk,savz 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 whidj44i73 2g jmrsbce +uch is 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/( x4lfior4hz the wavelengths of the three lowest tones producedlhoif zxr(4/ 4 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 Lqz7z04.i gxad is 200 Hz. Which one of the followin74ad. 0gqziz xg 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 its fundamental fr-p xjtbf .0z3yequency. Which statement i-y bt3x 0jpz.fs 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 closeh6os9ksu(u lczs0z/ *d* ;nprd 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 wavelengthsn+,x itpkd5 0n of the three lowest tones produced k0 5ix,nd +tpnby 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 Lsvpnb- ynxf+0 l a2d37 is 200 Hz. Which of the following frequenvy2+a ld0-n fx73nb spcies 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 mho( l9laqc :u8w+uv ;hag63p one end is resonating at its fundamental frequency.hw:3vc paqm;(lu8 o6gh+u 9 al Which 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 t4yze-5 ep,s xzwo 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 330 m/s. The person zz s ,xe-4yp5eis
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 sounds4di3+m9.i8 n ax prrv waves 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 togethuoy5s;w m+ri bvx0,2xn iyd 1:1lcj;ner and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the ton0y2b1: m,inwn r5vox j;1yuld+ xci; ses 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 1l.fgu+ac7obqtl 5i*df, zn4

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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 . n hmv.si-o9gobserver. The frequency heard by the obseim vs.n-hgo. 9rver 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 heard by thefxnaan;3nf7 ds 4p65v observer p3f xavd5 f4 n76nsna;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-speed, its z2+ou) c vj8-exbub6p half-angle will decrease by a fac6bu v+z joxpb8- )uce2tor 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.6/ p65tp fqa ot:ndw:a What is the air temperatfa:t6dao tqppn:/ w65 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 speedk;e z(+epe pbm6; xf.*mfhyyj;a)mz2 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 speed of sound in af o7o9(8y xns8dczpi.ir is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s czpd i .y978(xf8onsolater. 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 i/z buxzasn3 sa7r8 (uq525kc 5sivt5s. 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( 3alt*elk/va distance to the lightning strike is about3 taa*vlk( /el

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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 wi2g4fo +2uo52 we hlstemperature 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 splas:.l 5ty8mu y.2ht rguoh 2.5 s later. How deep is the well? (Igt5y2uot.g hm. 8y :urlnore air resistance, and assume 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 y()f (css shjc2u)0h p/e 8uou*5xgizwave 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 atunqfz1mn*2ahe 1qox 2xty: oj dg--2.v6a:hv $23 \; ^{\circ}C$ 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 wizi5 5zd s:)ur3;nar aqth 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-dB-ydt z okg)j;* 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 withgp9ry n-(.y rbqtyl9 2 intensity levels of 70 dB and-t g.( n9rqprlyy2y9 b 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 t0bqsund2p6r 8t m,cn4cpv9bp9s1 (qhhe intensity level generated by one eng b ps vnh4 16rp9p2nc(tsq9qmu08b,cdine?

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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 radiatingkg9cv1 p5on9go7 hn.9p2aw yybvx1 7 o equally in all dir7bcyonvg 1 . kxh9 vopo9y75gap92n1wections 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 *8ly54icvjax 6.0 m from a source that is radiating equally in all direc 5x8valyic4*j tions 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 assukb:+-qcyl s o4:q:sxwta2f d-med to be uniformly distributed in all directions. What is thktl- y: :xw ass+:dbo-42cfqqe 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 barkinq,/box a2d sv9jy1 9wug dog. What would be the intensity level if two identical dogs very close to each other / 9w,us9 bda1oqvy2xjare 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. Wl *j* v plh26om5g2nsghat is the intensity level (in dB) at a point 2.0 m from the source? j mlv ln2p5*g2sg*h o6Assume 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 5ndfl5k y2(j1v.0 m from a point source is 95 dB. At what distance will it be 75 dB?klfjv152n(yd

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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 thbc2vhu -9(*ylof*i4owjz3x- m .j dkfe frequency of the fourth harmonicx(z4ifclm* o vh9ky*.u 2 wd-jjfb- o3?

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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 is thkv7xlhu0ffh1+m2 , oldd.2t noe-+ q 5bmfcl/e lengthlm2h of-7flv5 e.ltknc1+ /dh um+obxdqf 02 , of 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 Hz. Whawz6xpod4 ks+5amgmm m5 9n-u +t is the frequency of the lowest tone that will resona6gm55 ku+sz -+momd x9na4wmp te 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 bothjao pbj + n;3dz8jkv rci26 )5f,hw9oh ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what isfba6i,k+j93w ;h2cpnor 8dzjo) h j5v 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 temxt5pu7 6seydei a-g :4perature 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 endx ;s-odb c5i.5mai hez(8 ur/y is 330 Hz. What is the frequency of the third harmon/8meo-sh ci5;durb5. i(xy zaic?

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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 pizcg, yj)xb5i,;mxu-:: sym,faeb f)vpe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/mjfgz,fvs:u,5i)y a) b,xc;my:e xb-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 temp7j4 x xts*5v r3gdaxj3bsodrz. l8 5/jerature 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 temperaturaf+opi5y+g x z)2ex. zrru-d )e 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 o bzzdwj 0q7r..h.poiu e6( n5when the speed of sound in air is 340 m/s. What is the fund5q jd(.znbiz7ph 0ro.we. 6u oamental 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 i c w0f3hoz3a8vr(wkt3s closed on one end. If the fundamental frequenc03o hwv kzc338r(awtfy 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 e/wl tuelhly (p y6t6/:qq-y;aach emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be mot ly;lh6a :/q(6 qw/u-lptyye ved 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 a63./k(g ihmngr ew6lan.r z9 nnd driven by the same frequency of 500 Hz. If the dista.e.nmnnrz(/gh6l6k39ra wi gnce 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 frequencies of 440 Hz and 444 Hz. What is the beat frequenc6nwga. bmb:vrg 1:er g) w(q)ry?

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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 550fqt ;ce/ z faghq(v( i,*g3x-*ob-/jqx av,zg-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hzot/z v-(q(g; ae /,qagf gv3jifz h,*qb c-xx*, 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 i-ql (krsng(; eq,vw/m/( pkqand 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocimvprs/ q(qw-;((e, /kqlg nkity 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 ib0 g -nz8yl(mstrings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is playedlg m0n-zbi 8y(. 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 stationaq q 0:,)l; qz66vwtsmue0 6a.qlvhule ry 1000-Hz sound source at twice the speed of sound. tq;e ls0eqva06u .6vuwq : lqh)ml6z, The observer 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) 1w ./m mhq5z+eb hfcb40ncp2-d 9yj tbapproaches a stationary observer at y 4-2f1 e/+bjhd5nb. c9tchqm0zmpbwone-half 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 lh0f+ xil c a;m.n*g/eyistener moves with a speed of 30 m/s away from the source, what is the frequency heard by/n;x *alyg0h .ie+fmc 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 wm/sha .n2 dj;ehen 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 of frequency does the observer hear/;j2 nha .mesd?

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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 bb:o,3y daf* e/qnin3 ilu+p8 py a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the * f i+ a,p3puen:bi8/3ldqonyspeed 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 towagli7gk.x1:ql c3j/ 6idmmixi-d +q 1urd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do youdq6.:1j/mx1idg uxmqilclig+3 k7-i 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 towaxiiftmfmw(2)8 :lj k(rd a stationary train. The train blows its 400-Hz whistle. Take(2j:m) itf mikl8x(fw 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 /kpb.fg 7ja. t400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do youg .k./afp b7tj 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 awaa o(.o ppsjo8 wz7ac;ztn 9w6767(wzprog+syy from you at 120 km/h. It blows its whistle, and you hear a tone of 40(w6a;o7nsoozpt 6.zo cw+ga79zsrp7wy(j p8 0 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 Hz. Assume the s*7 o; xo.bnlkdpeed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train xlk;on bo*d7. 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 ik jh l:zd2lkxb a*k:3jr ,*3abn air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train witj *bkdlk*lx a :rb:,hk3az2j3h 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 gg. 2i rm.*j4/de ejppis sent out, and a 42-kHz signal is returned. Assume the /grp*d.4i2 eep mj .gjspeed 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 produced by a supersonic aircraft loftfgn;py/.bzt4 +79 hs ;stis $60^{\circ}$. 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 4n if67p+6tfdbwv u9kshock wave fordk+ fi9vput w46b7 6fnmed?

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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 th2t+mjf 6ut1vfe United States to Europe with a Mach number of 1.05 where the air t1 jfvmu+6t f2temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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