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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 s xnfom2dyhy oc7 t*a/o ;ddi3,*f63 hftatement?

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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 fa fbanzvsvr;0/ vy uul4)v8 ,j9stest 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 steel rod;jjir c1h-0gw5fzvwcq,8hy 7 u q8wm 5?

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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 happens to the veloci 5hqx2ie w/97wy hwr;bty of sound? (Assume that all other factorshb; wxe/5qyi27w9hwr 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+rdv )uy8.auydr 334ksdfkuv8q 8 ht3 Hz sound, the velocity of a 200 Hz sound through airdft.3vhry qu )ar3 vs 3 4dk+uyuk88d8 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 tn0fg+-s **qv8 ld6p8+ q r 5gencgyey400 Hz sound, the wavelength of a 200 Hz sound in anysq *5tg+cg ln*+yfq6pg8ede 0v8 -rir 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 2thm3 tus/u79yubk;ue:g m(v 60,000 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 3 v;qq :-k9mdj-q:zb hthl:jt 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 al/ eqj)qz wvaa ,hr77:cl directions. If you move to a point twice as far away from the sqa7)r/aw :jc , ezh7vqource, 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 is proportioky 9 v/ ym,v3j.duch+pnal 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 vrg g5k9ex9g (distance d from the source is I. What is the intensity at a distance 2d from 5 (9xvggekrg9 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 equally in 0rh /i-bhd c/xall directions. What happens to thehb/h0c -d xr/i 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 () v,3zb.robjvr0 :ld qis hb.from a sound source that is radiating equally in all directvrs)vd:, qjbh( . lizbbr.o30ions. 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 soundl0; m 0,ceavsf 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 pure tone. 3)y,v9c;x1h e wfmpqxWhat characteristic of t;w vyc, x1xmh3qf)e9phe sound 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 musical notehy hln 8..mm; 6gqb;fm?

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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" o-;tbkfefwbl.h*gge :/2 d(azla:sv . f 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 aiajj5m7rx 2w/e r 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 displace h5jxfon* :usgd22uo nbn5l6+ ment 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 y w2qp -1 cmc5 kcqxl0o,f)xj1and the sound wave generated by the guitar as a result of this vibration. What do these two waves have inclc1-w0 mqx12jo yxq p)fkc,5 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 i9xcxp(z0xq m 7v9o5dwhich 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 ldzy l x++u ovga+3s rtqiun,:mx2(.)dength L. What are the wavelengths of the three lowest tones pn u+)zd,x:+mi ox+2ysultg.rad( v3 q roduced 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 re*3eb 1mzhbj x,j)g39kj ,lepz sonate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not9xb,,13 lek 3)jzz *ebpmjjhg 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 frequency. W l:f r5;lpgbc25qph:ehich statement is::pc5qgb 52;e rhlfp l 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 b f41ybxz8 tfj2om)0 his open at one end and 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 the wavelengths of t pv;l) n qgf5(omm,;l*+q i;zadj,tbqhe three lowest tones produced by t; ;,q 5v fod)qjm;az mgn(pib*lq+lt ,his 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 /ggg xc j*ygaqhr 2;,ht2l. 4zis 200 Hz. Which of the following frequencies will not resq2agg j2*lzhy/thgxc4;.,g r onate 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 frequef p b.j*yfwahnm kvv9;8) 9n,ency. y9vn),kf wf*m9j.veha p;bn8 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 two speakers driven by the same source. Each speaker pmxlypr+pv q6820iccydb s1. :k2 wb/br7hqa3roduces a ton cl2 ri.swbqby8xar1:2p0 p+cm3yq 6hvd7 /bke with a frequency of 200 Hz on a day when the 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 shouldmm7jjdx 37 wf6 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 p.to yqp x/nddj,si(+u e,.-ja particular beat frequency is heard. What happens to thyuj qdd, x+/poe-pj, st.i.n(e 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 exp6ub+u4+ lwgwks tc, bh cm:/wp4(f c(klains

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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 a6,u 9tm1:kbqbcid r( a stationary observer. The frequency heard by the obserikb:9at 1 ,bqmrd(6ucver 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. oe+a 26ysah::*w/ryscd9u wm The frequency heard by the observeraoauys ydsm/eh9 rc 2:ww*:6+ 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 half-angle will de7 7zg uaf4e mpx4m3yz*crease by a factor augm *z3 4fy7z7p x4emof:

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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 f3mw:)o ;oxm(h ng4 wfx 08(cdhe+qpk rrequency 45 kHz in air is 352 m/s. What is the air temperatk4(gr mmnh3qo()w:w dh; cf 8p+ox x0eure?

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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 t: xw)j3 25zfsyhdg9 vxhe speed 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 air is 340 m/s, a bat emits dtpzs:at trgn 7pzf0 n g)9;7*a shriek whose echo reaches it 0.0250 s later. How far an);0rz9pf7pt tda:gngz* s7 tway 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 tempeuzrtl7yd)1n. 66yb snrature 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 lr iq-+fwsar) :ightning, the distance to the lightni+irw:sf q)-arng 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 temperature is edh(qgd:iqt gly (*/5 $15 \; ^{\circ}C$. 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 splaszo)l 24 pt;jnfh 2.5 s later. How deep is the well? (Ignore air resistatzlo24fj; n)p nce, 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 bj )mf3d04 op2z stq8kf6o-fcwave 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 airsnjh c-d f6ycmsf/; uugx1zp)*rt0r;w +f ;n- 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 s t9nk dkmyq-i tnk556m,; hx7wound 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-dB sogbtwbh5 )2 ovrw90f fg*ch99dund?

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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 intensity leajn zh 2vyd2,6vels of 70 dB dz2,h jy6v2naand 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. Wharc -blg:03sis t is the intensity level generisbc:l 3 0s-grated 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 zxq8 vsw41 xqjg 1:jp7is radiating equally in all directiwj vxpjx1 s:qgz41q 87ons 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 mk qv8m*ont 2e.v vk;t7. mnny/ from a source that is radiating equally in all diren.o2nt*vym. 7 qtnvm;kekv8 /ctions 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 n-ml2wmf8/cqq3jqi qw,m7i)rd0 3bq 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from th-q83w mdfi7qqr /l,n jwm3qibm 2)c q0e 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 atjyvj k6f:t 8w2)ifnx; a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs veitxfw2:vk6)f;8 jj yn ry close 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 source the intensit*wdru kz27/yu3k5a li y level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume thk 25kuwydi7/*rzu3 alat 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 source is x3ph2lai2,(s lyjqg4lr2h5 e95 dB. At what distance will it 2 ,jl5g ia(ls34y2xleh q2rphbe 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. Whats5e0neyh1ic 0 is the frequency of the fourth h51y0ncsie eh0 armonic?

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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 piy;eq5cvoet:p 5,e7 umpe is 900 Hz. What is the length o;5:u, ecptev75emqyof 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 resonatm 4*h3n)pqh lhe in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate im * phq43lnhh)n 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 andzp;db tfr (f/;z1+n length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the snp;1 zd/ tzfbn (r+df;econd 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 temperature p hh.e1g4-nl+a /e fcbis $20 \; ^{\circ}C$. 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 at0ye0vvk0;v06ofm) al4 rxu oq one end is 330 Hz. What is the frequena ulko0x0om 6)0f0y;rev4vvq cy 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 end that will have a funda.wd2 n nwv+z 8rs,cgqdv*9k5 omental frequenvv 2n.5s8qodr c +w,d 9zw*ngkcy 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 i0f:.d2 wo ouny tpy5q,s $20 \; ^{\circ}C$. 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 yc :su2de8 *z1g +iht6l*:7unuxaqwxa 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 ol +d ve ugl3:6,r20ioc oqr4bvf length 0.75 m is played when the speed of sound in air is 340 mioub4ce2+v r qv6 d0l ,lgor:3/s. What 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 satkg v3-hpbk ;;me length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamkp;tb;gh-3 vkental 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 frequency of 800 t:l4 x;s*vmoxHz in air where the velocity of sound is 340 m/s. How much farther back w x t4mx*ovsl;:ould 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 500 Hz;g ngx(vzy3-s bc4ohu:ml3e7 . If 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 distancg3h:lxg - bvmyu (3ceoz7n;s4 e 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 frequenwk q+*4hav o-tcy?

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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 td5s ergc,4m31 yuy, :(ocv0f nmodr4 june the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequenc(cm0y1j3f45o:dy c4gnse dr ,rm uv,oy 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 and 7p*25lwym 9uym bok8x) m respectively. W8m l)mu 5 yokwxb9p*y2hat beat 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 ar:rgj6 4v q7bdqe found to produce a beat frebg7 6qd rqv4:jquency of 2 Hz when a frequency of 660 Hz is played. 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 stationary 37yg2 euzdi 3f1000-Hz sound source at twice the speed of s de3g2z3f iuy7ound. 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) approaches a stationary observer nqbuoa+:iy+ 3 at one-half the speed of sound. The observer hears a frequencn q3ui+ ybao:+y 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 speed of 3c8gtzp4r .uh: ,eg(mm0 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 mgh4rmzpem: 8.g(,c ut/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 da ;-ka8z (jkk)tn gzl7ty when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadsilj-k8nt za gk)kzt;(7de. 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 obser /hoz l.uiqr+oqcr89-ver when a train approaches with+/r q 8lizc9.-uo oqrh a speed of 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 b9nw q gx9g6u1 /f-tmdclows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wh mt -gcdw/169unf9gqx at 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 traq/79ofoiq;j f. ekyhh d +(sa5in. The train blows its 400-Hz whistle. Take the speed of sound t9 .h(5y shoq/d;offj7 e iq+ako 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 qncp424 ih( dz9t. 4j 9y8a0khhfvzaofrom 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 you ahp4.h 2znac04 k(z8d vqj ihfo94t9yhear?

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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 its whistlcn p 4 m;gisyq0bkb;b)12/vc le, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whig1b;bkb4vc)ms2 ln/iqcy ; p0stle?

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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 :ccqk vl9oj t 5.gv89ssound in air is 340 m/s. What is thetsokq gjc9v8:9lv .5 c 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 +sb .0le,:gt8wsxefv horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What:lsf8s b xv+te.0wge , is the frequency 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 sent out uxp/2rspfe7cw2/ni6za48 wp , and a 42-kHz signal is returned. Assume the r2uifcs/ep2678 x4/ pwz wnapspeed 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 conic9z0 9m 9z4) tg8r tivm w86harofvyx,kal shock wave 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 conicaize n b8lwz7+ c,/kqu5l shock wkluen5q ,7+z/ic8 w zbave 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 Europe with a Mach number b5kw-n8ys+ oox0c (ykof 1.05 where the air temper yn58xcyb- o (+w0okskature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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