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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 stasu+hbmhpsc9 b(ad))* a0 q 2a*nxncn-tement?

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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 facc0i4*v md x*ustest 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?3q/7u:.z vwbci93ittt xpl + a

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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, lfqzzy29y 76a/bbrf : what happens to the velocity of sound? (Assum9af6 zfz b2l/7:ry qybe that all 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 9yu4dd ix/fp*hn, fo5 a 400 Hz sound, the velocity of a 200 Hz sound throupfo/ 9xf5* duni4d ,yhgh 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 Hza4.edf 1wtk( z sound, the wavelength of a 200 Hz sound in 4d kafe 1wz.t(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 tha+ epivwdc 3i ;,a2eha-:a(-+rwfv zudn 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 ms,pcwd,56z80la tax wqk+ u/ 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 directiokvrb h7s ;90y t(rltajljtw1;42brt)ns. If you move ;lv90sbt)rjakt2(rb 4t 7hy;tlj 1wr 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, 1;ab t jsntecb .v71lzf+e1vnd7u+o+ 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 f sg/ satfm1x52n+;.jvv sf2yis the intensity at a distance 2d from the somvs.x1s;+t fa2vyfs/n 2 j5fgurce?

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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 d s2 pw-7k-u6j 3apkb.ypg zr0girections. What happens to the intensity of the sound? It reb.upj zg6ag0-yprk wskp-327 duces 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 av+v. fge/s b2nm5wc (is radiating equally in all directions. What happens to the intensity l(ca5v / 2mbe nvf+wg.sevel 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 vijb2d)fm31yq-v2 dt 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 towa o-+gc;j qcec2v0,)vo gp blu8rd a speaker emitting a pure tone. What characteristic of the sound,o b8 +q ove-jp gg;2l0vcucc) 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" ofz0f)rd9( yzlv 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 a musicalf y,swwxp7yww fq();- 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 a*oq5uw/ nmc+5l ,v eooir 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 displacec1r2 9x t-ex*sz.i1t jqfer4 ement 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 f 67ybyourv (0j7a3jpa guitar string and the sound wave generated by the guitarbu 7ajry7fo6(vpjy 30 as a result 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 ocee)5v:z4n2 fl f n8vupen 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 arenlkt, fpr5 yg9kew0-w8st 4 9r the wavelengths of the three lowest tones produced by thi8g t5pkky9fsltr-we9 n 04,rws 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. Whiq-, :: uisuj reyvqy xcc7.l:);6heav i 6jpt(ch one of the following frequencies will not resonate in the sam ,qj:v ex6 yi -q6l;h ia7 (jystu)c:rv:upec.e 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 L2vrp;6aaz .0c06 xy/gzemy n n5qdpe ec 5v0i. is resonating at its fundamental frequency. Which stateme/z acgqp0adny 0zve 0xne5;y . .i c26rv5pe6mnt 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 op88;. gvz exgjjen 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 the three lowesa *lm /tc 6cuw(2q/swat tones produced by t2ua*mas6cw ( qwlc/t/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 is 200 Hz. Which of x3h rbxo7 nzkg ( *i1:mwfaoc4(sz g4.the following frequencies will not resonate in tk*o hfgz4743xw os b.(rnczia: mxg1(hat 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 fundame il xtjw8 3m2y5)b.udhntal frequency. Which statement is cujh23d5t8.)w ilx mbyorrect?

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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 speafuno-6g 7eo jcq*12wct2i7 ojker produces a ton2i*ewt 27n c 6o7jo1fg-oc juqe 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 should ha* -- mqrcuq0mwve

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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 frequencqfx6go)le+;vq/g;rl 7ly.x d y is heard. What happens to the beat frequency if the frequqqv67xf+ /lgol l ;;e.yd)xrgency 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 explainrg,g-ifo-9s1 ,wvhrl q14dcl 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 approaches a stationary observer. The frequency heard by - 4o;,ropvs0g* oo)dva d0o ./k ncqeqthe obse onvsqd.oo)0a /op*ec k r-d,q4;o 0vgrver 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 bya5 9xkxui9(yyi1,y; d8 ippmhvh7x s8 the observer yi,1 x pahyx7u xd py8;(v5k8i9s hm9iis

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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- lq:i /bh6xm:xspeed, its half-angle will decrease by a factx/ 6i q:xb:lmhor 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 frequencyg1k7i j tox- m6lhj-l( 45 kHz in air is 352 m/s. What is thh l-ilk7 mxgo-( jj1t6e 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 speed ofh l)-l wcvd*p 1( dq.gx bb)ntky+ru/9 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 batsvgpce2f: u4.9tz2+av k1umq emits a shriek whose echo vgepuu1t:fv24c mz.q+k9 2 asreaches it 0.0250 s later. 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 aztz,p;bbo 88g 1-jsr4.00 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 )gyxrl g77lj2c)b 2 fsto the lightning sgj) sfg2 xrll7 y72c)btrike 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 clif+6,rllo*p*4p6 rci a7lhdj nzf 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. Hbp49ms*zf z +eow deep is the well? (Ignore air resistance, and assume the velocity of sound is 340z*z4bmes9+ pf 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 freqlw5wg*4c f7i0smgsi 0uency 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 ok1:*3oh jllpat $23 \; ^{\circ}C$ 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 inteni6h6ie pq7 ug.sity $10^{-3} \; W/m^{2}$?

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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 l-fs;4div sx 3of 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 h+l 2yai08 5 0hlk4;r:m miy hcvc,gxmwith intensity levels of 70 dBi+2 m4kiyhhh0 8vcl5m:m,;ca xg y0lr 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 cl.p tuu 0x-zxb669okgarage is 100 dB. What is the intensity level generated by oxkuc69po. zx bt-u06lne 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 c1kx/taqulvn, r d0ud zsk*u: s:*nb9 4fuh:, 6.0 m from a source that is radiating equally in all directionu 4,fa 1bdd9xtkvcr n,:: sz:u*hsn/u*k0qlus 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 fr m4sqf+t8qx8 kom a source that is radiating equally in all directi4qtm+fk x88qsons 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 xvcd509kstq0/vcm6s b6 m3 ymof power, which is assumed to be uniformly distributed in allmxbmmy/0v 63d6sq kt95cc0vs 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 distan*dte+fx jb,j6t co )6ice 5.00 m from a barking dog. What would be the intensity level if two b ft,d*)e6ci+t 6xo jjidentical 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 sourcex* jw mzim7d24 the intensity level is 60 dB. What is the intensij imd 2mzxw*47ty level (in dB) at a point 2.0 m from the source? 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 source is 95 dBuh v4 ykwde f9r3;1,fp. At what distance willw; fyu91fedkr4v ,ph 3 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 *y 3 qiqcciy1 m*cwfr)qhd76 7tone has a frequency of 1200 Hz. What is the frequency of the fourth harmoi7q1y3qc q*rcmyiw*)c7 h d6fnic?

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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. What4av 4je9lva 9w is the length of avl44ae9j w9vthe 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 iwu f4v:*x .ml gbyn7b8s 400 Hz. What is the frequency of the lowest tone that will resonate in.l* g7 :wbvnfb8 x4muy 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. Ig8.g9/kyveo)i*8rmul*.yc h ib4nawf the velocity of sound in air is 340 m/s, awue lh *.r*c 8y9/vig8b4.gmioy)kn 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 ahk1g9 pms8 quv6*,bwx 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 in a pipe closed at one end is 330 Hz ( dns0)wblmi7. What is the frequency ow 7db(0il sm)nf 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 ob;*l f dy(adj0f the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the vel*dajb(l0yd; focity 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 temperaz ;*pbs(,veuz 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 a3d tbcz :z+fs9 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 of length 0.75 m is played when cp-iyympul61.m se ,tx2u;1ithe speed of sound in air is 340 m/s. What is the fundamental frequencypy2p;sx.uct imm1 le,y1i6 u-?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes oq/ vf1d/8ytzhf the same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe df 1y qz/8thv/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 each emit a+jlze9 u(xqi3 frequency of 800 Hz in air where the velocity of sound is 340 m/s. How xe+3iq9lz (j umuch farther back would 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 anhpkb y e0j+vl*7 t dnm+.dd8,pd driven by the same frequency of 500 Hz. If the distance+deht bnj,0pvmy7lp k.d*8d+ 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 h;n.r8nujb x*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 aktnqw4k/;4gbj7a b 4 v 550-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the iqwa4;j k/bgtnk4vb4 7nstrument?

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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 7 l8m30d)x jlxnm respectively. What beat frequency is heard when tmn)xj l8xd03 lhe 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)fxek59u:* em-guk i v are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change invm k ei9:guku-*5fxe ) 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 1000-Hz sound source at twice the spee dn;tmkr))j g: se:.q l*hu+f;t,alp fd of sound. Thfk ru.n::;ts apm ;lg)*)+jthl,qf ed e 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 stationary2( gtnam,xu)hdg r 6n2 observer at one-half the speed of sound. The observer hears 2ad6h trmg )un2g( nx,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 moves with a speed of 30 dcvv 8c i,r.)o)gs* tsm/s away from the source, what is the frequency heard by the observers), or)t .d v*c8gsciv? (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 -tq/9(fozwy nhsigkhm 5+z* irv:y 61traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches iq 56v1r:nf+9 hy t-km hiyz(sow/g* zand 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 obx ln(-nk0/ ouo* 3gnasserver when a train approaches with a speed of k/ualsnx-n 3oo* gn(030 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 blowsf6odst.2 g6l,ztg ox6) h6 ikg its 400-Hz whistle. Take the speed of sound to be 340 m/s. W6t6x .z 6ks,ot )h2figdlogg6hat 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 towardh 5wkw3f ,nw6j9fsb5 t a stationary train. The train blows its 400-Hz whistle. Take the speed of sound t5,3w h6w5t bf9nkwjfs o 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. Thfq u+9gz kss,0e train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearqf0zu+ sk,g9 s?

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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 fro2jpg(1 0fln ipi*ifsa):* pwgzu8( cy g2y7ykm 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. Wfpg7jp2:s2y( l* nykcgf ap(8 u)i zg* wiyi01hat 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 sound i9)d(os +osbd1 ol+l;l uhp5jfo;jsn)n air is 340 m/s. What is the frequency heard by an observer if th s)lj+d(nj+)oospo h1;l ;5fluo9 bdse 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 Hz. Assume the speed of soun,r7f k7:dbx.ll d0wab d in air is 340 m/s. What is the frequency heard by an observer if the l,: k.af d dwl77rbx0bobserver 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 determo6jax978il2tr gai3g ine the speed of an object. A 40-kHz signal is sent out, and 32rxaal gt6o9i87 igja 42-kHz 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 produced by a supersonic aircraft is ei ph s34yood71psfccq54 4 eaa j:j2;$60^{\circ}$. 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 thu-xdnhxzlv8+ *. mv2* 8ue )6iniltb ne half-angle of the conical shock wave formed? nux m8lnv)lz8 d2xub+i -.e6nvhi **t

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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 . 8aw ivfwrjb(1z.9heavy)y7from the United States to Europe with a Mach number of 1v(.)ihj.1ebv aywa9 7wyz rf 8.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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