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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 statemwn1 8ixs.: i.n)pqbyzent?

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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 fastes+.qx n6l ahg4wt 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 steeo5hwt ry( j9c:l 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, whpfqoo8 ;k+ns5 xcywj5+wn/m5 :2ipoh at happens to the velocity of sound? (Assume that all other factors remain constant2kpq n ; sx/: +coyn58ip5mow5ow+fhj.)

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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,dr-2k+dz+g.m2ml nu h the velocity of a 200 Hz sound through ai2uk- gl +dn2hmz dr.m+r 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 a 200 Hz soun p9oca/ 1phvw3d in apc1ah opwv39/ir is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations withhiqr g 2rbmo +6 oym0gz97l)7mqh*7tp frequencies 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 frequency less than 20 Hz /070eb3xh snf- fjq.xbfnu3v 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 etus:7c / m82hoxszr4hmitting waves uniformly in all directions. If you move to a point twice as far away from the source, the fr 7hhs cr8zs4/to2umx :equency 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 propor ro/y s7r0)xvvtional 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 distan;cyo4t ie, o 0)ekplcsq5,7acce d from the source is I. What is the intensity at a dista,)a eq,lc cieookt4y;s 5 07cpnce 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 sound source that is radiating equally in alld-;tqb10j1k ozt6( il tf(zvb+w wjl/ directions. What ha/kl -w; tw o q1t6(tz0dbv1bljifzj(+ppens 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 equally izax / dlk-(i2y ,ps0ux 5zn8wcn all directions. What happens to the intensity level of the sound caz2k, wp(ul x/5-xyszi8n d0? 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 followingz8x q d87 -lvceia2w z1ven7hk300bmh increases as a sound 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. Wha 46 jtj/oo(:)czjfpjk yr0l3a t characteristic of the soujo) f(/j c64r jaolp3 tk0:yzjnd 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" oo,ef:h ij9 g* :5fgyrqf 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 musical notee. fng.p:c-j q,hc)ut?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes fromvi(z/pz, fnx*ygchg p h:r*7sqq7 m 7; air 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 y+g5c-)t.ivo*lm mz*6 lkxly 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 gqr0w s ua+zef/;*3(l5tjyk qg enerated by the guitar as a result of this vibration. What do thes ylsq/r jzq3+u0 t gew*k;(f5ae 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 open5ln6 qi np.+ux y3z qjiwdv(,* 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 the wavelengtk yx82+-jb-5gc ;2y becoipk ohs of the three lowest tones produced-kpecij;k coo- yxy b8+g 522b 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 -vc**8+y7:dmp;mo* 2j irztvf my vpvh .ka 3topen pipe of length L is 200 Hz. Which one of the following frezt7*vck+: 3 8mtv*j-rv hm.padiv ;py*om2y fquencies 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 eqc 3 o(:7xtqwx5/aiufrequency. Which statement is correo /qc5aq t3u(w: 7ixxect?

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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 whi+wt(dm fp q,k.svk/9j7g ,+qxfhfj* mch is 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. Whm*i-.2c ovrv hat are the wavelengths of the three lowest tones produced by this v 2.i* omvch-rpipe?

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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 resonal* ) l 7ca6zxnuo8hgy5te in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pi yn8c*hl) og6uz7lx5ape?

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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 a0 m) ew*9aa b9:uvlfbat its fundamental frequency. Which statement )l:mf9wbv*a9a0 eubais 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 drive2ftk k 23xtfs)b ;fl;jn by the same source. Each speaker produces a tone with a frequency of 200 )ljb 2 f kttf;3xk2sf;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 fsim a6tvc5k j:(:0m48fw 3a qmwn;ygwaves 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 together and a partic 0p/2.vove1 vupici4wular beat frequency is heard. What happens to the beat frequency pcvi o/2.4v0eipv 1 uwif 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 expla:1h7 kj:fhwo tins

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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 hec kz;k2r3.kvxard by the observer iscr3kv z2xk.k;

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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 frezka9v5t -x hyyys,vcd :yi0-l: /hai(quency heard by the observ,dkvz:95 yy y c0-siathl/va i:h( y-xer 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 its5cp95q0i hh pi MACH-speed, its half-angle will decrease by a factor5h59pqpi i0ch 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 so qvdgt rp5 ,od,8kr9:ound of frequency 45 kHz in air is 352 m/s. What is the air temperatuv5q9go dkp,8d,o : trrre?

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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 d o:dcl gax)pl-lp *uj o3*shs(.0rb 1ur9wz5of 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 br5d xy.tz)iz3 at emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the soti r).dx5 3yzzund?

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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 n*g thpehzu )4t)9 8fh4.00 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, then0io j)hu9*g o distance to the lighg oo0)uji* 9nhtning 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 oudkiqvtt9c9.qkjc*y : 2e1 f/n 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 welr, k;sijoh62rj/1:geef g*o el and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sou;e2*/jf r1 ekehg:j,sg6 oorind 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 ay1 9mv*9vbymz9 mrlult99f e- sound wave 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 a pss 2om(h* -dg1tqq9tir 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 soundz fnkq00fg+ann wmek7m94/h: 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 sou(m4z:)kc,o v3 rfyqpand?

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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 pc)erl,f ej.+ e mc56x k;lw-ib2r:jn intensities of two sounds with intensity levels of 70 dB and wc;.r, ren5) -p f2exbjl6m lc:keji+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 qp/m(kw::qdqe/ 7xu1c io; llgarage is 100 dB. What is the intensity level generated byuq;ik : 7pdwl/mxe/o:l1cq( q 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 radiating mg/9 h3qz2 d rc7yy4d-ipytc 1equally in all y21pgc7d ct z4/3i hm9-rdqyydirections 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 ofses26h 9lhhcp 4 ,1 6ngnun1zz 6.0 m from a source that is radiating equally in a2u,1ns l4nh9cn gzephh1 6s6z ll directions 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, whicugl a+vq 0 /88r:b nhj4ai0degh is assumed to be uniformly distributed in all dirjnu g0l804 geh+8ra iavb/d :qections. 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 distance 5.00 m xn+et zhcg a b4)18y:6srnv3 dfrom a barking dog. What would be the intensity level if tw3 gdxny1 :6+ a4)8btcrs venhzo identical 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 soun ofk 44icc4k k1y* i2wz-ocsa9d source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m frc 9is1kwa cc4okkf-y* io424zom 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 dB. At wzw,2pcorg4 ewqgb8zp2k b/45sjz ho1nk; 7t/hat distance will it be 75 dB?gopck/1 tg5282bs,zhzr/4obkqpj ;4w ne w7z

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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 yan, -7jkmh1)xdx ,l za frequency of 1200 Hz. What is the frequency of the fourth harmonic? 7y a lxn-x,hjmk,z)1d

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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 r34ii pmg1 g-q900 Hz. What is the length of the pipe?gir 4pi-m1gq 3

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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 le4mf ;w.o(qi zcngth L is 400 Hz. What is the frequencwo4.q;f mci (zy 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 the velocit t pofpz;u8reg87 (z5hy of sound in air is 340 m/s, what i8fzp; z58 (hgrpeto7us 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 where7bg9mcv;b/pz orrhyq/: :jl) 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. What is the frm7 ; 7buxv6gg+u8pmu 9x6 fdppequency of the third harmonic 86gp7vmu7fx 9g 6mdubp +;upx?

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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 wq -b9lu6fbf-fundamental -bl9quf6fw b- frequency 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 theg )/b)v;gj.ke nh91 2p --sizdzphaeg 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 the82 q2 lbqx/nc gprd6vb9 :s5jp 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 whg stv 83jc96uv9isn5)vc l 7* le4jrnlen the speed of sound in air is 340 m/s. What is the fundamr8397l*c5 ngjv c 9e4vtvssn6ijl) ulental 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: o*osr(sip11 n7p bjce)ne is open and the other is closed on one ep)p7ssn(1* 1oirj bcend. If the fundamental frequency 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 each emit a frequency of 800 H56lw (1sf ukz);*c vc/gwn yonz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in f cw(vk*wnysc1ou6/n5 flgz;)ront 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 4 if3f; gztkeiizeoi1 b(/p7xx7*6o x side by side and driven by the same 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 is 34ix4;*kezeioi1xzt f7f/7b op3 6xg (i 0 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 1i,ul/ks*fu t1hq ;r8g 71)psv frllqis 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-Hz tuning fork to tune the frequee)aaw38 j*ingncy of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrumentw n8i*aega3 j)?

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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 ho+fx:v yoc):oo rns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day wyfvcx o+o)o: :hen 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 arenl cn w42 37e(idsnbw- found to produce a beat freque(nscw-4nde32lin7b w ncy 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 approachch)63-gzqplp m f3r. xes a stationary 1000-Hz sound source at twice the speed of sound. The observchf m.3xpl-6 g) rp3zqer 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 frequeo5rf4lt1zwjn1u342i v; djdlnl m(*bncy of 1000 Hz) approaches a stationary observer at one-half the speed of sov mn4z 1irldw*2n(b1uj4;dt l53lojf und. 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 frequencumkq9o4d *m)oy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency hearu o)9dmm* o4kqd 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 dayvfufe2:viiw) +i3c e ; when the spei;:u vevfiwe2+f)3i c ed 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?

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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 i7)c* ihz t6 he6: zw+rynkw d0,r90sq 2iqfucobserver when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound iswy hz ihrc,q96czsi wi6f2n*ue007dr+t)q:k 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 towaqp(gq8fjo (9,z q/ htdrd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of( / (qopfqtq 9h8j,dzg 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/h toward a stationac b6.)xzp 6 s;ikdero,ry train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequen ;r x)ckszeoi.6db 6,pcy 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 ankwexbluz50p i erx7; ( pjh0z5a7b7- way from you at 120 km/h. The train blows its 400-Hz whistle. Take the spe ;5-57n xbkue wr i7(ba0xzppz07hlejed 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, and:j s,7tfl f5kf you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistlf: j,f tfk57sle?

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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 in air iej p*6+;1kb :l*z rma9k 5zcusz)ur2a ro/fj cs 340 m/s. What is the frequency heard by an observer if the observer is moving away from the2 +6)ekc:*5rzjs acf9 jorka ;/zuuzl1mp rb* 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 sound in a+i,r*eb a-fh nv: 0fotir is 340 m/s. What is the frequency heard by an observer if the observer isf+ ihf - b,*roenavt0: 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 thz20wnae 9e eq+rbwp, 7e speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal iz,7a +qew 2n w90pbeers 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 wg :r/n.xgu, gc1i cz4tave 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 con0cyqd ;yqt ml.48z vnjewa99.ical shock wave ylt8a .e 4dvwzncy.9q 9; 0qmjformed?

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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 u9s/xo9 f* okfEurope with a Mach number of 1.05 where the air temperatusfof9x/* uok 9re is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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