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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 statemoj+)g 7d reiez 3ob+ ,0qi7geqent?

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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 through ;b uepujigdmyv)):vh 0 io++/ ,zesj*

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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 irv 0xcj,25a+9r m*8nlykv var n a 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, what happens to the velocithw4 of852k esmy of sound? (4sk5w2e 8h fomAssume 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 a 400 Hz sound, the veufhfkty.;d7x-x )yk 5locity of a 200 Hz sound throug xxkk- yu).df5hty7f;h 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 sog ktk:eqxa,j 5i)(;3l1w cauyund in air5 l:yik a3k e,(gj;qtu1a)c wx 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 c 2 a5)lyr2umvu 6ob.i3ld9dafrequencies 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 frequen:p i8k3f sv/yznr59zu cy 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 dire)p.mwf7fb. pfj :cvs61)k pefctions. If you move to a point twice as far away from the source, the frequency of f7j))cf :.psem wv6bpp ffk .1the 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 prohd (os. jf7kh3portional 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 distanc)xmph yg tqs* vd (bza(/g;ld 9h((x(ne d from the source is I. What is the intensity at a distancep(/(adn(t;)dgxg*x9( ymhsq(bh v zl 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 fro( h3;7voskgj hm a sound source that is radiating equally in all directions. What happens to the intensity of the sou7kgj vh;h os3(nd? 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;fbb+m7 ( vshs in all directions. What happens to the ;mb7sb (v+hs fintensity 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 a sound th6 ml flw94c1)9cfowbecomes 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 6,c2jypr6ef i pure tone. What characteristic of the sound fi,62cpry6ejincreases?

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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 mus5xw ; fqfg3awe7ko *+uical 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" +-oiqurxn9s /wc,t 8 *r-y mxnof 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 frot2ms:pe lee lg,(7d h8m 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 waves are7xcx)h +o)2aob;6pp 3kcje b d

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standincv*/b zc2; e r 3axxq3a)sfc9 :isu7bjg wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. What doafbs au3*27ve x3)9b ; sq/ccci zxj:r 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 bothts. sroe h +-jz+ *q:p)wpebi6 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 wavelengths of the thr7aq yyz )+m,k4fh jjs*ee lowest tonesz7k, y y4a+ j*fhqmsj) produced 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 openv+8a aibrxv2 k)d4j ,v pipe of length L is 200 Hz. Which one of the following frequencies will na2,jvib)d4 kr+vx av8 ot 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 f+i7muvdbk:( ) crg1gjrequency. Which statement is co rkj7cu+vid1m()g b g:rrect?

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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 one end and closed at the other, thmqk 515- mjvs)vq.i gsere

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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 thr ,piv svz du--tj)0mm9ee lowest tonpji-vztms-v) u90d m, es 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 Lh2c7ux7t h zdn1fb- b it:n)y, c4z*dv is 200 Hz. Which of the following frequencies will not resonate in that pipd71tc,n:2 hyvn)z*fct dhiu4-bx 7bz e?

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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 frequencs mda ;uq+0z9ohjmr.,y. Which s,9mo.jqar + h0ds; uzmtatement 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 betwees0en v0b.tp x7utai,wz*e. qrd ,bjm ob800*sn two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the m.*u,s0e0j8zbbt bi 07 pa. ton edr0s,*xwqvspeed 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, -tle2+ s*t 5gf esohe)the two sound waves 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 soundeqzwlq6,n. .qz8 .t xq1)k1levwg7z zzd together and a particular beat frequency is heard. What happens to the beat frequency if tx.z8lw w7 6z 1zzq,.1)klv qezgq.nt qhe 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 explain :qvg w.:bxkk: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 dtkfxy2kw, 0mv(ae i z(zw4bch5h9) )observer. The frequency heard by the observerwat5fwk2)yz0(h b )k9ez(4m,cixd h v 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 fropkhvj:+mh -7 w 0k4jtnm a stationary observer. The frequency heard by the observer ik 7jh-:tkmhj0+ p 4wvns

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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 its7yk.no8n;ojswt3g a 0 MACH-speed, its half-angle will decrease by a facto;g o. 7 3osntwyjn80kar 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 ,tnr+bb9(2wg ki6 a77,hy.x sceigdsaj ys1 (of frequency 45 kHz in air is 352 m/s. What isy2s .1a tbr+xew79 y,kgba((gj n dish is67c, the 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 of sohn zhub53i+ i6ykczsd 2 )1ay1und 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 bats;56y g j1uw-aj7mlyd emits a shriek whose echo rj ymw lds7;g6a1yu5-jeaches 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 temper4tyz jbsy29ny5d 7ii+d9nq( hature 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 ligtj3ls oxfd 4zj o+89w;htning, the distance to the lightn;z8xo9 3 w +ltsj4ojdfing 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 on a day the t5t; b9mokf.fkny+ 93tw(ds ldemperature 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 tzbu h cu*kzf,jw73 9(pka5u/zhe splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 m/s(wjpukz/a h3 bz7 ucu95f,k*z.)

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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 frequency 500-s.o3i4 3lyj;td6 kcol( to ty 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 aioa50,vp:e gbvr/ :mdbr uv d01:luce+r 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 s z4em z vdqv7e 0m+:;*fvrpdgb*vst*-ound 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 souvy2d4 uo+u0ignd?

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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 r,o9ve 2 b06e7fiejxctwo sounds with intensity levels of 70 d ceji2rfe6 , b9ox70evB 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 garage is 100 dB. What is the inte9;he;sr*:pux lz cme-nsity level generated by one en ;9echr u ex*lms-zp;:gine?

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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 thqaqh0fye*;j4;:qqx*feb( fa+) s i orat is radiating equally in all directiqa eo; sh ebqf r 4jqqix:f;0*f*a(+)yons 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 source that is radiatm)ngas3g1(cz ing equally in all directions igsm(ca )1gnz3s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 ou6.) 77glx. cryfz+m jm5lhgabout 1 mW of power, which is assumed to be uniformly distributed in all directions. What 6f+ ujm5glz.chom.yr7l x )g7is 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 from a barking dog. What wouo/;kx17ccqed ba3 l/e ld be the intensity levee/d;xbae 7 l1k cco3/ql 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 int4iqc0+zl;(l92t f8p 8teqp n/u hwykyensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equpcl q9ny h28/iql0k tz(pyu8;f w+4 teally 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 what distan5 8ua jsa2ff9hce will it 2a ufas9j58hf 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 *nclj,m/lqf 4 a complex tone has a frequency of 1200 Hz. What is the frequency of the fourth hq jn/4lfcl*, marmonic?

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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 an7:kf6 qcmim;y open pipe is 900 Hz. What is the length of the pipq :i6fm;yck7 me?

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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 red5p0qrwo 8sy:05 skpx sonate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipeq0p psw0dk:ox5rsy58 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 q(0,yre2t0jv dkb2k6k mj js:has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the secr, t6k sd2vkyj :0kj0qem2j(bond 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 x .f47i/y /njz .9r ytz+hpuvain 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 freqo6+yn:7 hi6 f v+fcjxzuency in a pipe closed at one end is 330 Hz. What is the frequency of tyfv :x+f 6i6ozn7h +jche 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 one end tha1-uti,zjgoz 8sc5z4g m5bg v0t will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 tgsg41,0mbu-j5c8zgz zvio 5 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 wheres0q3xipsn2- h 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 wbi(wb9, d nk7tu;5xj lhere 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 the fpsgf)o;, ,. .7yvknxvdha) vspeed of sound in air is 340 m/s. What is the fundamav vnk.f 7 ,;x)d.vyfg,h)opsental 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 otherdwh/(n zw4(f7 vqcl+f is closed on one end. If the +4z7/vncw wqfl(h f (dfundamental 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 Hz in air where ff 0 khecm24jxkl.6j/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 wouldm jlfc0j/ kf6k.4xeh2 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 same frequency of(f ppc2o m+w.d 500 Hz. If the distance from a per.cf+(ow p mp2dson 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 and3)be:gd7 wl (pk +crfa7s6ldm 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 e 3yjk+mr/qi 0k *e*ldtuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 3 ky r*0 /*me+ikqljed2 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 and 7 m respectively -vl4k- rrtqmn:ziv i- hb,g1)k 1of)m. What beat frequency is heard when the horn-qbrn1r 1mh:imlkk)z -,f oivv-)t 4gs 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 arr dkup8 bb0qp2xe,cs b w91eez+2k-h:e 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 eeh-bz0e9q8kd1 2b,:b xk u pr+2wp csthe 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 soumj (pdnw+9v ql4 y(a,xnd source at twice the speed of sound. 9a ,(v(dp j4l wyn+qmxThe 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 stationapg yxq. p(y(rccx r61-ry observer at one-half the speed of sound. The observ1c 6p(xyr(pqyrg-c x.er 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 frequenc./rav a (xu94fzu;4behk 7njmy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s.ak(enfzv u jr4xmb 4h;.9u a7/)

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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 when tjdf:y3ew k0i+ he speed of sound through air is 340 m/s. yf: + kiwje0d3 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 stationa 7z*rxx8(lbio/hf:f zry observer when a train approaches with a speed of 30 m/s. The frequency of the r*h7lfi:x/zb (8ozx ftrain 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 2e sojg0g.9 mk( aq2pdtoward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequeq mgp. e( 0so2a2jkg9dncy 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*tt/37hqa y : mv;i4 thgdxzj3 toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do 4 jqht/*tx gz:t 3;7 y3mdvhaiyou 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 120mc 1 ru qw-02 9fql6oe8f.um*utdm e4m km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency q12ufmte lfwm 98coemd *uu-m. rq064 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 bl*nqgk bl3. xx.ows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequenc3*x g kql.xbn.y 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 u*3lioztu(8 p.sy/ pfof sound in air is 340 m/s. What is the frequency heard by an observer if the obfo/3s8pz tu*. pyil( userver 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 sounbo8itq1o7l ajo8c *6jd in air is 340 m/s. What is the frequ6 to8lj8jo1*a qc7boi ency 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 isxdp m;jq11bhp 98 j4db sent out, and a 42-kHz signal is returned. jp8bpdm41x;q9 1bdhj 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 shocb3*w9m1qu.z .wj ukxb k wave 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 conical shop3kli *0omtckm c)6h.ck wave fokl it m om6ch0p3.c*k)rmed?

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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 1*/o r 76i3x5 t vze-zoq.nrcay)wts aEurope with a Mach number of 1.05 where the zs1*x73 -n./ w qoztr5coi yt)a6vaerair temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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