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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 followin;qau(ohd7n /og is 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 conductemltmoudbt)q jn,f5p350 phpai 36*a/d 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 sound in a steel rod 4 lcnd99mnqb+?

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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 inw :; jxfm8dx1ocreases, what happens to the velocity of sound? (Assume that all other fac;1 :fxw omd8xjtors 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 ct.dpkh+( r6t( ab1o qsound throug6adcb k+rqpt 1t(o.(hh 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 Hz sou)o:1 a nua8ahbs96wkpnd, the wavelength of a 200 Hz sound in air aksp8onua ha91 6:b w)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 thamnbdyi-w4wsr 2mc 0( *n 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 la0x2gl j 9y4gare 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. r2 nii4 gmoht rzl*ox 00f*nr)qk6u)(If you move to a point twice as far away from t)umqhz4lkir* )0ni*xt6r rnf 0o(og 2he 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 waa:( 5htf*skf oves, 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 pfzj 9 w3*3pujel(i*z.jb 1rjr oint source at a distance d from the source is I. What is the inte p3bj.193l(fu rjzr*j*wejiznsity 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 sound source th omjye, 4m:brvyjmj(+e-o (- iat is radiating equally in all directions. What happens to ,bm-ym j j+jo-v 4o:m( eriey(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 p k9yh)6*pcfd5jav;h)3 e1cuj k -mmksound source that is radiating equally in all dir-9a)chcpf e* j6dupk5 yhmv mj;1)3kk ections. 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 aet 966j)g0v*mcsy i3 vlt.bva 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 p((tcijpc.u53a4k7z l 7y jpyspeaker emitting a pure tone. What characteristic of the soun.tlcaczppkj yu7j4p(7 5y3(i d increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudne pok/0nvv0w 2vdk) il7ss" 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 a mubr5mevqsnl0r:0 c69 fim9i tvgg4 t:,sical 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 wa:5 rbzqfl3 hf;ter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wav sutdt255 reg1es 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 ah0k(lt9-k7lbm 1afg on a guitar string and the sound wave generated by the guitar as a result of this vibration. Wha 9l k( h0a7-glbtkam1ft 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 pipe9ct3e, t8k lbh which 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 the wavelengwnhj,-0jvri *o j *n2p kz*f*jths of the three lowest tones produced by tv-j* nj*w0*pn jh2*r j oikz,fhis 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 iq s xhc) prpnh250t/;,h,i cg+bule4e n an open pipe of length L is 200 Hz. Which one of the following fren, 0p/+)ei ,h5xrctu lh bcsp;4 ghq2equencies 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 frequencyz9:xc 1ngeqwb72mvjg0 t1 -+ecqme5 d. Which statement is correct9tez:mwvmbeg +n-gxec2175 0 qc jd1q?

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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 ats8f 1bl1-*wlkk8 ;fqych: leg 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. Wha6*rdqf*v1 pbwni)l 3p: 0fes pt are the wavelengths of the three lowest toneswvpe: isp br3f0q6pl f* 1*d)n 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 closed pipe of length L is 200 Hz. Which of tn e l6(o m.fggh9342krpgk,wfhe following frequencies will nm ,ek4f2kgprwgl39nh. f (go6ot 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 atndi2i,;ioug l,rk9* w:l* omf one end is resonating at its fundamental frequency. Which stat* odug,wir k l9im:il,n;f*2oement 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 3 ji b)9cl)nhp o;quz*6hne42cauw qrp, 7t0d two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a duqp)nl p0; w7b4iazedc)ur,n2q3 h*ot9chj6ay 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 shkibk,oj1-xp0 aum u6 -;fw r)eould 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 particular beat fr3upx 2 pkhm1lsd3 )dnd33cav.equency is heard. What happens to the beat frequency if the frequencppv1 x3hnku 33sa3lm) 2dddc.y 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 exp4+ojuqytab tt)n ,m-0 lains

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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 observebee 75o032 n8eu silxbr. The frequency heard by the obse lb5ie3be xoe0n82s7u rver 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. *x)kae bb-0lr The frequency heard by the obserr kxl 0b*-)abever 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 decrease bgk*f,1v h ou.ag qlx,-y a factorgu 1 kqo.ha- x,*,gflv 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 a*ey ,cub 3m9bqir is 352 m/s. What is the air temperature?3 ubm,yqc* b9e

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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 of so/orchkeg,o.)h 42 xoxund 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.dti li)7aob 1ei23a effnd(2 340 m/s, a bat emits a shriek whose echo reachel3abiai i t(nd27) 2ed off1.es 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 4.00 s. The temper/9odms u:c26xckt/ y(hrmv3* hcac 0z ature 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 seeizcd.3l+8c8a;ml hz le yd j(k*ng a flash of lightning, the distance to the lightzdzll(*h8.8ycd+cma3 j le k;ning 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 2.0bmse)a4yunbqe 2b ;5: s from 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 v7 *; w58;bdbzsiaivddeep is the well? (Ignore air resistance, and assume the velocity of sound is 34b;a*7dz 5d ;vvbswii80 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 f g,s5da pnr +qh5mnm3.requency 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 at +o1n6xcc-0 pqgbs7km $23 \; ^{\circ}C$ 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 wi/qlbzi h:/+klr ylt5 aqu(4,d th 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 w5wc(kony9g4f yl,qwnr0,t ed-yd2 9of 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 with intensity levels of 70n-(j yihuisz1c*fb* 5 dB aii*u n1hj-*sbc yz5 (fnd 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 b9p6 ne6 koxroev6bwc 3-p 9-mengines in a garage is 100 dB. What is the intensity le6pceob-9x3- kbnro 9e6mp 6vwvel 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 disuzg;xej+, 9u dtance of 6.0 m from a source that is radiating equally in all dire;exz9gjd+ u, uctions 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 from a sourcem-, eop mvo+)t that is radiating equally in all directim, em -o)t+opvons 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 okf cderd2 :m5(8gz+ uuf power, which is assumed to be uniformly distributed in all directions. What is the int8 rk2 fugd( dcu:zm5+eensity 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 fromv4xy/it.k+ wohyq4 u2 a barking dog. What wouly+.t4wk/ ioq v2hy 4uxd be the intensity level if two 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 sound source the intensity level 6 g,+6bjh5gxfx 7 fxjris 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sour6+b 57,6fjgfhx xxr gjce 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 54 8 6 ( wjfe*zo()/hdctjd-ouyte asq9.0 m from a point source is 95 dB. At what distance will it be 75 d q 4shjod() /jd(w tzco -e69yfu*et8aB?

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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 1:zgk;hf8ndrjo1(* 4 i oj:ca,:gpq l b200 Hz. What is the frequency oj8zci 1fjnrb,(kl:;:4hdq:gao o*p gf the fourth harmonic?

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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 ta5.(f 2tmn6a vrfz.br1pv+zj4 og a +rhe length of the pipe + gzfr1.nt+a prz( f64voj2aa.vrb5m ?

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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 ope nwa lb98zxo,w/zo9d5n pipe of length L is 400 Hz. What is the frequency of the l,zowbz99/85a n o xwdlowest 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 velo+f yedztwtn7d0 o1(8dcity of sound ind17tw+ yed( f8z d0otn air is 340 m/s, 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 a roob+vho zaj91+3ux8 z 5k/kf lzjm 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 H1s,p5r.f g:d qxg6qfo z. What is the frequ1q56 srdqgfp :gof,x. ency 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 ,qsdpj4 q19i2t m;v skone end that will have a fundamental frequency of 60 Hz on 4ji d9tvkpq,1q s;2 msa 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 temperatubn;(+2kwg/d,rl+6v rmbst tire 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 w gt,sq +pf)a1phere 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 the1v,e++3 y4 becyy9 vvt )h)cnn)uw hvx speed of sound in air is 340 m/s. What is the fundamentye )yhcb e)v+ut93v4ch) +vn,xv1yn w al 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 opb frbrzn .cgj9((- z2ten and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the close rnzt2.b(brcgj 9(z f-d 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 Hz inx-pj92* n-mgp-v pg+t bhm(nh air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be mnp h j+tpbm2m(-ngpv -h*xg9-oved 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 ng.3 +yccu*; 7wlcsbp 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 possiub3gy cn *+psccl7. ;wble 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 frequencie mwqg845bk jjyj1w,l,s of 440 Hz 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 a 550-Hz xy x9d5 *1etnctuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the freqnxy*cxd e 159tuency 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 lg7r1e +i( rguqxj( 3kj6zdd*ng; aw11iw;da6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is d; ued6ngz* r 1wa3(ri7dlj qai1g;1j +g(kx w340 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 twouw -/s*k64ivf kol sa3 violins in an orchestra are found to produce a 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 -su 3afkwik* /vlso6 4bring 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 statio8r-5mg e:lzi0 uo-4ms td /kjpnary 1000-Hz sound source at twice the speed of sound. The observer hears arl5d-u0/ 8m zj o4sge: ptmk-i 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 (normd:o1b4)*/sj h rbzogpal frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency o pdg/o4srjh ob :1)*bzf

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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 3gbpnlp mtp7k97 0 pu:7lo1u0r0 m/s away from the source, what is the frequency heard by the observer? lpu9bk7u ml: gpt 7071r ppo0n(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 wheng g3jjx(4tw;k8 lww6g xjb+ a: the speed o8jag:g tbw3g +k ; j64wx(ljwxf 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 sta5pfl.szsp:/q j o-0i qa(yx +dzrc9y8 tionary observer when a train approaches with ao-pdx9faz( sy8 z q.5 jr/+c:ys 0lqip 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 blows its 400-Hz whistlerto-y ;,vovv3lvz: i 6. o3 t,-lyovvri ;v6v z:Take the speed of 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 stationary train. The train blokpy;as+v2.f 6 /tmuepws its 400-Hz whistle. Take the speed of sound to be 340 m/;f /sap pvte yk62+.ums. 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 i8q efvjf *k.g 0+smd/cts 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do+ fmkse*q 0v fg8/jc.d 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. Itl; t0a ( lz9zxix*l4se,1u hmd blows its whistle, and you hear a tone of 400 Hz. Takei(lxlxm4;z*u el90za1h, d s t 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 q)62g kd* tpvbspeed of sound in air is 340 m/s. What is the frequencyt*q)gdvpb62k 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 Hz. Assume the speed of sound inwv -ueye eki(fo)us7 9pq6t0e dtc1.) air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed opteykqc .e eod9u- ))7ewftvu 6(s0i 1f 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 senta z83z8i0: uoy1pmxsmxx7 h5v out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the o808 hmo:5z3 xmy1vizxauxs7 p bject 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 2v o; asviwwef8vil+1;n ,*up$60^{\circ}$. 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 ow l/df9z(jq5of Mach 1.4. What is the half-angle of the conical shock wave formed (9/ 5zqoljwdf?

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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 Eur(;x09 kcrhc:r fe2 ckrope with a Mach number of0x 9er c(cc;rhr2k:k f 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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