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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 fg ,u a. d63bzxyro.q-jalse 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 fa:vxfjn-)g/ mik/u //g7 ,ew5n uzgqfwstest 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 s 9p;u3fag4 k 0ar5y6m(2mzct2epa jeyteel 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 happens to thbu x5qt s 5kn7y(/f(xre velocity of sound? (Assume that anrq( 5f7x5x bktyu (s/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 a 400 Hz sound, the velocity of a 200 Hz soun+ auhc+8m24tispqe dzf)5: z nd through aqath 24dui+pm ezc+zns) : 5f8ir 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 v6:kum7mh 7s e/qt5ppa 200 Hz sound in e76uk vp/h pq t5:sm7mair 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 freq/ec.yj 2 njq4bi wyo57uencies 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 with 0ejn 0jo:pc8kh-8wds 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 sourahux/x0dst: b73m/tb ce is emitting waves uniformly in all directions. If you move to a poita dbstm b /0/3:xxuh7nt 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, intensity is proportiof1pky20huk,t b3. k3 w gzrmy-nal 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 sourfcer ;ggi4) g,ce is I. What is the intensity at a distance 2d from the so;eg rc,g)g4f iurce?

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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 all g/e pj l8.g wqwd.+p6edirections. What happens to the intensity ofdg68pj.w.gpw qele+ / 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 fro9:l ,4o5a fk xcs) u3jl(wjebom a sound source that is radiating equally in all directions. What happens to the intensity le9obju3w (j x5s calf4,)oel:kvel 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 becos uix:id),-n39tf u zfmes 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 fo+5w+yqiyd -a speaker emitting a pure tone. What characteristic of the souo ++wi5 yfd-qynd 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 notew8sp+pcf jqc h4r7(mlt 2h7:c ?

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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" ofl d)5. gma9ilp 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 wateoeq2 drdwh /u2 zg869er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves ,)d9z khhp+fbq0pgn 5 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 gu(gf kyxs00 w; p+ p/7lxfyk4wiitar string and the sound wave generated by the guitar as a r xfyw0 i0 y+fp; wslk(x7kg4p/esult 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, ther2b*+ w4upt0hhuxs,tr e

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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. zqrp2t 8cep)(,dj7ot What are the wavelengths of the three lowest tones produced by t8pp(,jqzroc de)t t27his 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 ivhk*5 htsn z++n an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?hh svk5n+*zt+

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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 res olgg-tzs r+z-8te;g+uhxlhwg b 5 3qx(1a2)qonating at its fundamental frequency. Which statement is co 2+g xz+z 1qhg- uq o;asehtxbw8gt-( 3)lr5lgrrect?

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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 agal l8 n2g.ioco -j9;ht 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 ok 7gm/zl05b.p h. e-omhgaeq2f length L. What are the wavelengths of the three lowest b0pk2mmq e7lh g-5e/ao .zgh.tones produced 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 cloq dgy gud-e5* mm*:n (-mkphf7sed pipe of length L is 200 Hz. Which of the following frequencies will not resonate p dm*m-5u:7gn ed(hy*-m gkfqin 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 isa7cqa m. kl,;5zyo8tk resonating at its fundamental frequency. Which statezm a8 y;7ao .c,kkqlt5ment 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 bkba y:k-s8e3 vfe ss)9y the same source. Each speaker produces a tone wit:83 se9)faks-ksbv eyh 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 should har.x d73 ipehlz j;;v 72jvprjj9d3r4j ve

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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 togeth y50 gw7eysli6er and a particular beat frequency is heard. What happens to the beat frequeiw0lyye 65gs7ncy 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 ex n9 0a0mt1nlz*uo ide(plains

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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 kyg ;u8h+0yjoa stationary observer. The frequency heard by the observer isy oku0j h+y8g;

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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 frequvm:l d c)d fl5dj3hb4o;d/dp2ency heard by the obse :/4l d)d ;c dvdbdlh2p5fo3mjrver 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 MAl +ze5t+k 4:hmgrs,rnCH-speed, its half-angle will decrease by a facz4:kgh5,e tls ++r rmntor 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 o7+);xte 4n bzckd.vd7/duw trf frequency 45 kHz in air is 352 m/s. What is th7+ cve;x ddtzd7/ 4kw) nrub.te 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 s,skh6ov,p/am uk n uz:g12q;jpeed 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 *c)f xwa;mh5cr dv6-g2okgm7 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far5; co72gcm6xkdh rv)fgw - *ma 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 echj.ilud;13aq lo 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 distakd;i j) e y2h)0c+shoynce to the ldy 20o);ey kj)h+chi sightning 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 fromt hqrb49 fat 3v(he0lz2ekm8* 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 well and hear the splash 2.5 s later. How 8 mcipite);,n deep is the well? (Ignore air resistancetc m)ip;8nie, , 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 wave of frequencyk-9nvun8g sw - 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 atn 2pf-lbs6 (0u- c iq3lxg+jkk $23 \; ^{\circ}C$ 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 intensitzds5/j):3z zevmnb.r y level of a 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 o 0bc2lzo0d4shjdj +bx 9 +gi*wf a 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 wimbjo2hlzu3;l - eir9 ,th intensity levels of 70 dB and 40 ilb3lj;9o2 ,e- rumzh 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 t6ct (ui7dr--gm8 kw zahe intensity u6i zgk cw r-8(7mda-tlevel generated 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 is rb0p0erlpyi y 1kkn ):4adiating equally in all directions iskp0k)pi0yrbne:41y l
$6.0 \times 10^{-10} \; W/m^{2}$. 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 distanebzzb t) w8g8+w ifp)twv,s./ce of 6.0 m from a source that is radiating equally in all directions tf.bb) wt w+eg w,8izv sz8/p)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 akxz l/jrp) f rt639e9 q(0zbi*lleq3 about 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)f(lr 9a/tllibp39ex z6qzq j0e*3kre 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 ba7nm8t5u3 kq.s1 tsw snrking dog. What would be the intensity level if two idet.utw3 sn sm87qskn 15ntical dogs very 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 inte+do-hg.q7 tov-9p i* zsp:cgm nsity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assumqtgod- smh goip7 9z:c+-v *p.e 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.o)cz21q q m i:lftwn*)0 m from a point source is 95 dB. At what distance will it b:)qczlfwqtinm 1 2 )*oe 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. Wha(yoq t/ ( k//sm9pol (joxy.wkt is the frequency of the fourth harmonic(ok/qjk 9 y(xp(/ m.swtloo/y ?

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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 us.mrh3z5x cn. 1dzinz ii566open pipe is 900 Hz. What is the length of t3zd h.urmi 6in565czi xs.zn 1he 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:jnwt a.)m:rl of length L is 400 Hz. What is the rjl.a:nm) tw :frequency of the lowest tone that 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 ends has a length of 0.80 m. If 5jjm5s rn:-4l mh 2hxjthe velocity of sound in air is 340 m/s, what is the5ml-5h: s j24rmxn hjj 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 imv1bm9p9 o)sle*/n q2isfc1gs in a room where 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 i **f s/:n2 txr i8v:r;tsque 9w8bs51vdbfrfxn a pipe closed at one end is 330 Hz. What is the frequency of the third hsvfvb i; r:2xd*n 8s:w uf18xf9rtb sr/5qt*earmonic?

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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 pisftcg,c+k e,. kb1 gp4:ee4w3. ipnewpe closed on one end that will have a fundamental frequency of 60 Hz on a day when the geiw1 4.3.w4e + kepte,gcsc:,pb nkfvelocity 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 wh1i 3,fy(aha bq61ocf30 ixx rjere 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 in a room where the temperat7qsb wbhx lq :(k)1td;ure 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 pp39ksldncwh/w) s( 7wlayed when the speed of sound in air is 340 m/s. W()snlw skwd 7h 9pcw3/hat 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 othe;2kxchv 2jt/gw; 4 kcpr is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what iw2;vc2htc jx/ ;g k4kps 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 fs0 aluok- hsctt,t1ie,9c om:hfm;p6 e7 9g5trequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back go 9et;mt0 a 519k-mip7h6 ,sl u:ceft,tcohswould 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 s 0.tapzreoh)d - 4b i+9k5snvpame frequency of 500 Hz. 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 distance from the person to the other speaker? (The sound speed i0+)r-psveo pnt9 5i 4z hbk.ads 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 frewds5q1cxu bt.t *c;btmxpr/4 9p4v /equency?

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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 x:bigv chuw7mv; i i-q)uw;;9 a musical instrument. If the tuner hears aiqmb:7vui9ihw v;-c) g;x ;wu 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 horns areifbyvsid.(r n l3c 71 0io*)0.olhfgb8 ch.aa 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?.0ll.1vyaofr8i( i0s3 7*bf nc )h hgbaco d.i

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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 ;ica8r/i oe,wc:qr) 4mj8 e rmfound to produce r e : 4craecm8/)i;rqjoi,wm8a beat frequency 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 100 t cq1g*9xg+subfvy;/ 0-Hz sound source at twice the speed of sound. The observer hears a fr*9qbt xs1+v/y;g gucf equency 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 Hzcqz/ k 2ea x 1;yzkf9jh2 uv 7-v)jc3l1a;uplp) approaches a stationary observer at one-half the speed of sound. The observer h7ujuy c/zx2;3 z -;p jc1)kv2qef1k9ph llaavears 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 libk.8p,cgpb:s stener moves with a speed of 30 m/s away from the source, what is the frequency heard by the ob gpcpsk,8 b:b.server? (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 dayx d0-h+7 :gc9met xpzc when the speed of sound through air is 340 m/s. The c0gc 9hectpm:- +xxd z7ar 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 when a train approachefd w9 tx*n b1ftw488aos with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound 18f t*tawb49do w8 xnfis 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 400-Hz wdk /v5 cvdgr)lw37 m3qhistle. Take the speed oc37 l) /vrd5wkvgm q3df 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/+k qvm5chy)3 6 c0wbkoh toward a stationary train. The train blows its 400-Hz whmcb k5v qc+ 30oy)kw6histle. Take 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 400-Hz whidy l xa6b4lw;r4 tm1s(stle. Take t4;l16twmd s lr4yxa(bhe speed of sound to be 340 m/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 from you at 120 km/h. It blows its whistle,4y2 /9 kdu1sghwnfma - and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of w4ukmfyh2 g9- 1n ds/athe 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 hornm)y( mt3*dc ok is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the fre)o c*tm3m(dk yquency 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 Hw r/grlhm bhz 4(2pbn:;h r90hz. Assume the speed of sound in air is 340 m/s. What ish r:h9hg z /n(hpmw402;r lbrb 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. xzxq p6-z/j-f A 40-kHz signal is sent out, and a 42-kHz signal is returned. x-z /-zx 6fjpqAssume 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 produced by a superuao(k /p9i)wq+xl jw,sonic 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 conrre)cyxw //cg8yb6p :ical shock wave fp/w:)ec y8rx r/y g6bcormed?

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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 nuv 44yqtr.jhyp7lsm n14(uw 2d mber of rn j(swmp1uvdy2 ylth.4q744 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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