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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  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 a /wjku,v(80vqs,t :vsy9 thl 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 fastest tr9sp9 uf4 gs 4pr*sdde6k5l3ohrough

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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 au et*jks)(24w ar-nk s steel 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, * yx)93l g sm+xjm ,cvz,dzm.ewhat happens to the velocity of sound? (Assume that all other factors remain cony z3.s g,+xz9e,jmdmmx) *cl vstant.)

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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 souelg) 4 g::yk6 rt0lsbond, the velocity of a 200 Hz sound throughk:sto 04) llger gb6:y 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 sound, the wavelength of a 200 Hz soundsz7q1et3a.7 si k4rfv in 7zftv. q eir4s1a 73skair 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 fph:m.e sj*fx 1op/z 7yrequencies 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 thy1h +q-,nze6b(b zc fcan 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 uniformlec1 +shka f: qmo89cl v)dx2j,y in all directions. If you msh)ofqj8ev 1cd:cx k ,m2l+ a9ove 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 divergihk8jqhto -3f (ng waves, 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. iq jyl5.z3eow rafz.(z0ci ;c8-vko j+ u1ix is the intensity at a distance 2d from the souoq i;jz8w5ce3. .cj(yro z-0 z +iakli.1 vufxrce?

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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 soobggk+ )+l*03 gnnnz yu9f-hgurce that is radiating equally in all directions. What happens to the intensity of the sound? It rnggn3 knl ugb*+0g+9zh yo) -feduces 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 t++7tnz)jc bs ehat is radiating equally in all directions. What happens to the intensity l tz)j+nsc+7beevel 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 increnmz *k-6l.,lrzewh 8 rases 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 n /3ki /cy k.l/wgscl4a speaker emitting a pure tone. What characteristic of the sc c.gsy/kin 43l//wk lound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnes 9 y9te7epovs-c:v 0kds" 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 musical no n8g:apcb h 1v8ds)f7fte?

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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 water7 u-n tsym sno 2u2k0awa00vzzh c1/0c

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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 areie/5ic)z s4e r

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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 qgfw)n7;7 aj twave generated by the guitar as a result of this vibration. What do these two n )j; fw7qa7gtwaves 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, thereg+-r:ajmfs wwr0 jp*9

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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. e :,,up,am3y4pytvffhq h 2o -What are the wavelengths of the three lowest tones produced by t o,:ypfh-qh p4u, v2eamt, 3yfhis 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 ofywrt3+tk (6 abb:;eov length L is 200 Hz. Which one of the following frequencies will not resono3 wv;e:bb6atky(r t+ate 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. W1rj*-l3dzenk16tub3g ym sil3/wr7 jhich state/63 w *1lrbkiuj dsrj-7t en13 3lgzmyment 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 open at ye i o(qvrlij7t7..ws;w ns99 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 lx 3y3/ vdun3onength L. What are the wavelengths of the three lowest tones produced by thinnuox333 yv/ds 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 l(uzs gmp(sp0* ength L is 200 Hz. Which of the fopgz*mus(s(0 p llowing frequencies will not 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 at one end is resonating at its fundamental 5 v 2siu0laa ,7**tmumjuy /r(ab x7qafrequency. Which statement is co7ta*v auy mm,2*qi 5uruas 7abxjl0/ (rrect?

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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 z7b zw19k;+,i h-c jvnhuua*j6cl2a h same source. Each speaker produces a tone wit 7a,hci6*k 1cj- al z9zv2un+jbuhw;h h 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 q,y;hj2rimo t p5k 4:ishould 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;z4xe qg xu)q5 frequency is heard. What happens to the beat frequency if the frequency of one of t)g;qz q54uexx he 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 exp/(shf* yq(pv hc tsk*+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 observer. The frequency heard by the obst:)r+ h ,zy*bt 8zdisdm1lxg1erver i:)d tzbh+m1 8gx yitd,*r szl1s

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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 frequencfkrmli4 i )*+wy heard by the obsek )ifm*w 4+lrirver 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 w6n jbzdd(2obn.-rv 56,l p fuoill decrease by a o (.rjv26 5o-bfz nublndp,d6 factor 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 air is 352 m/s. d/ov n0:v8nxaWhat is the airvnnd vo/0 8:xa 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 of/,ov gqdvwa4i. -:ck u 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 -d xsn e 8se:xgl84v9uair is 340 m/s, a bat emits a shriek whose echo reaches lvuns4gx:ee dx-89s 8it 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 cliffb k/d vlxe:gktd4*o*kh o/q. ), and hear the echo 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 afjfj83 j6v(e.3chq5gn qjnk i :ter seeing a flash of lightning, the distance to the lightning strikjn:j6 v(fj8gn5q kiq.3 hej c3e 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 cliff0 gu) ss7yu7rn 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 heart7dozx 66j wly0ep+8p the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the vet6p0y7ld+pj xweo 6z8locity 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 fref:qa6oolcwd/+ z -xs (3qz8unquency 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 alkfx +xq1d 3 ujdv6e)6ir 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 ag6, oabeq h+ rcbis5e;h2- et l6s/n.l 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 intensitysv 9 6e6ty eis3uxz7p/ of 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 intensitieomwgq68c ,rv4 s of two sounds with intensity levels of 70 dB and 40 dB?mgq6ro4wc,8 v

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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 eo*+uf9mkp+ k ou*fs.in a garage is 100 dB. What is the intensity le u+em.+*ko*pkfou sf9vel 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 g f3nes7vdk; zy4-)ob a source that is radiating equally in all dirko 4fsyn zvbg7e;-d3)ections 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 s 0cmqehys8q3(kz r1* hource that is radiating equally in all dhc s8 hy1mz* r30q(keqirections 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 powe-- 1,ay+cp5o fnnpijtr, which is assumed to be uniformly distributn1jpnc,ti - y-fa5op+ed in all 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 distance 5.00 m frowbc a;zfu/ u8:m a barking dog. What would be the intbuu/zwa;c f: 8ensity 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 is 60 r+f ad b+q,nvka4gu28lem1/ mdB. What is the intensity level (in dB) at a point 2.0 m from the source? Assueuq,mlk+8 a/n f4gm2 a +b1rvdme 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 dud d9gk85fp6x ix -(mpB. At what distance will i59xm ukdpxgp 6- f8di(t 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 tone has a freqg-3d*2gk l yia44o*c mkyl)fo uency of 1200 Hz. What is the frequency of the fourth hagl4myi2-k cf*g a* dl)yo3ok4rmonic?

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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 hr zgk r75*w u23zy7smis the length *sm 325zywzr u ghrk77of 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 resonate in an open pipe(ro0/uvf1eou l:r-ronq1 i t- of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pr/folui: urv - o-1r(1tenqo0ipe 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 ofludwc u; h5lo h4/74gm 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency ohmo;l wcd44ug5lh7/ uf 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 wtfi:xwbgx f;w v 38kxln+x (/*here 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 enk8 tl,a(9gyefp)m l20 ij v-cgd is 330 Hz. What is the frequencyy)jgit-g ep0llv f9( 2,acm8k 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 clppvqu9mpk + 2(osed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/s?9 ppukq2v(+ pm

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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 iouj7co2+fq0 g1j a1xukf5p4ys in a room where 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 roonf r6x,6rt4vf m 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 *h0.pe: oeww eplayed when the speed of sound in air is 340 m/s. What is the fundamental frequency? peh:o.e ww0*e

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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 other is closed on a09jcc,9l5bub onf9avo,7r w one end. If the fundamental frequ9of0caba bn95 , j9,clvr uwo7ency 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 frkl-af 0 pavyyvi :q1.nxx9sao/ z8(l1equency of 800 Hz 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 front of the sources w09avll saxny1y1o q-z:a8p/i. xvf(k ould 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 )5s/9 ue ihy0hs +achnj5gl9isame 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 pe sa5ihg 0ns/y9hecj)i lu 5h9+rson 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 -7;wxvpn a,yk c(a9hmthe 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 tp,p1yqkl6t4 pq( nh-m9iic 2 oo tune the frequency of a musical instrument. If the tuner hears a beat frequency opko n9,- iyptphqq2lic46(1m f 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 are 6 m a9s/ vgn6c+i e0tg*qrs nd 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity og /gv+ ieq0s6r9*tcs nf 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 vio f4j hm;g-fd2ilins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played- im4gjhdf 2;f. 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 approache.jgf8b +pbxj53 /xluv /ducq(s a stationary 1000-Hz sound source at twice the speed of sound. The ob cb/+(fx .jlb xq3d/gup8 j5vuserver 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 obser;j)lu.vd w wr*ver at one-half the speed of sound. ;u)drj*vw.wl 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 frequency of 1000 Hz. ad8ru n 1cn67fIf a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observrn 16da c8un7fer? (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 sil;p ww5rh,h 7vren. It is traveling at 35 m/s on a day when the speed of sound through aih7h; lprwwv, 5r 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 byqivq )2b:y-n v a stationary observer when a train approaches with a sp)q:nv-viyb q 2eed 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 nuyoj:tw01 vz+62t9wlozrxuc 33ai9 train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency dr9+1otuz zv c3ox6i9waljyw3n: 0ut2o 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.2dw svn8hc0x( The train blows its 400-Hz whistle. Take the sp( h82dx vwc0nseed 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 sbpf+emo, j/ (z,)txytrain blows its 400-Hz whistle. Take the speed of sound to ojb/m)sxt(,, efz +ypbe 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 you 1qg-sq: dare*)2epi j1bf xp/ hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is s): /ja2 1-bqe r xgdfqpp1e*ithe 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. Ass iv0 a 1gh;hq4en7jjj1ume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from thej1g;j 1na7e0hjh viq4 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 8ptm/8g z8wn; d88qfrjs9kacin air is 340 m/s. j 9 fr88;npdagw/8q8ctk8mszWhat 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 out5eq qpjb l4, cqq)eqk/5jq*r4, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. Hrb5cl5 q eq4jq),qp/4kqjeq* ow 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 a6 x5 iwk(-ewi,ky ubg3ircraft 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 t bewp25qf6dtrsu4 i(1he conical shock waveudstwi46 r25 e1bq (fp 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 fli *f2nm9 bf;ysvg:v ny6es from the United States to Europe with a Mach number of 1.05 where the air tfg;26f *vmyvy:9s nn bemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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