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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 a1 :/8mwz;k fnbd-c5q bfuzu0 wfzu:7 c 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 conducted fastb 4iq,5- s0auix mvp2fvj +f*qest 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 xss)+ijx54 1tz1 +, qfre wbvlz f*hx-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, zqlms y:r2j, 9what happens to the velocity of sound? (Assume that all other factors remain constant. jq,m :l2zsyr9)

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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 t6p o c 6m/nv0bny//,e2clfgla 400 Hz sound, the velocity of a 200 Hz sound through p//ng02y fmbe/ov66 t,lnl ccair 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 a7jhv. 4ph)r2leafi; b 400 Hz sound, the wavelength of a 200 Hz sound in e)bh4.;hjp v27al firair 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 thak+r txez(mf,nv6qg 0b4/ .c fan 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 th y7q:qx35oxx pan 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 emittingpomu31l7e:xe waves uniformly in all directions. If you move to a point twice as far away from the sourcxem3o7l1:ep u e, 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, intensity is proportq 7)f7ytr l5phional 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 so6zou7 roe.w. jq4pu42b)vhigurce at a distance d from the source is I. What is the intensiuugrpi6q2hoz7o4 .e w.4vj ) bty 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 sqgwl0 3+5a; axl// rj71rn wb mthq;hnource that is radiating equally in all directions. What happens to the intensity ofb+ l /1;m7ajnwh3 athnwq/rq0lx;5gr 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 in al3s5y3xoab*g - -xn;t qor qku/l directions. What happens to the intensity level of the soundygxa;/ ro5qbx-3squ 3tk no *-? 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 i: c0ovw0x iz0idqm,5 qncreases 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. u h2x d.dy2*pa b5(hci+ /kyyqd )s;twWhat characteristic of the sound h(yydudth.2+p5sbya *w;xd /qi)c2k 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" on8dbe jgbajj u.)a3)(f 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 n nr- k4pb hyg.)/sen5wote?

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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 a5o vekcxa:44.o9 dsxxir 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 wauofa:.w *qy)p f **9uje i2klcves 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 sounfj 4v/esqw.d r-v-r coizk692d wave generated by the guitar as a result of th-9 k/24ciqsw r.vd rvzf-ej6ois 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 whi .svyt4 gddmv/ ny-9:qg r7kv k,4nq3cch 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 wavelengths of the three lowestc7oo:6t ioy1 fu- f/wo tones 7 1ofo6:yw i/u-toocfproduced 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 open pipe of length L is 200 Hz. W sbf 6j. 590d r1knpfmjh5f/cthich one of the follow1/dpfn5 fh965m cr tskfj0.jbing frequencies 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 g 8v/p4 k c*;v:6tig1zikupuzresonating at its fundamental frequency. Which statemevpic8 g:1ukg k6 4*uzviz;pt/nt 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 on -xs1gb tru/q:e 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 l*)vma-apo vp4x3f n8kength L. What are the wavelengths of the three lowest tones 4f8p)von*x3a-pk avmproduced 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 20uu6c r ss3a2woer 1- v)ts.8ly0 Hz. Which of the followi 2) s1cvus3srro6l w.-uey t8ang 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 on 4t6x.9k5vzpzydsp(wu yae bv7/04cl e end is resonating at its fundamental frequency. Which stateazdc.pwkly(yb6404x95u/s t zvpe7 v ment 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 two speakevy..k jeu3re7 rs driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. e ejr u.3yvk.7 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 bh ol* 83wiv+ylu :fd (dvih.y*eats, 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 sounded together and a particuemcv. lf.o1g oxs/d3 0lar beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones iolo0s.d13.g cmvf/ exs 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 explains l6k/.i(de wil. 1merb1tyt:n

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approacho9u,qup ezn5cl6um0 5es a stationary observer. The frequency heard by the observerluc6 ,up e59noqu z05m 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 observel k.fkas9ix 3oy i+6jf3( eae6r. The frequency heard by the observer iaeii3es(9 + 3l. x6ko jffyka6s

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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 wilfq firmlvev2j6n3r8+wr 7.x g cs1+ m(l decrease by a factor of .+xsmn2r j+ 7femgc8fvl6 3 irw1vrq(:

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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 l w9brw x:a:s-:e nis-kHz in air is 352 m/s. What is the air tn--ib ws s: :re:wxal9emperature?

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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 sound in air l gpo1i)s e)f+;wz 9qxat $0 \; ^{\circ}C$ 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 sowr06vh2 p3-m0p. 3imvd rr)t y .lqagrund in air is 340 m/s, a bat emits a shriek whose echo v3d-rmpq w pg i)hr.l3tyr.2v 0am60r reaches 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 temperature is uvace m63f/+5 dlxadvx9+z2n ip:rm;$0 \; ^{\circ}C$. 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 to t7,ee+uslbf /1c bvoc 8he lightning ,7 o+bfbu cecv18le/s 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 a3812h wrc jppn 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 dsupio) lm. i8 3u1;gzxeep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity 3.su iox8 lip1) ;umgzof 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 frequency 500rj5g1ao 9n7 d /nw5phd 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 airl2p;)gm t xsng)l.upf0oj/ )e 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 sound with intensity d-vu dr w nhbs-yy2d (u-)9ay6$10^{-3} \; W/m^{2}$?

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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 g +,tw/ rir)py,q4 ktcj3s kj/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 b)ua ;h a cf.,8n:f1suehqco f hg,*n;two sounds with intensity levels of 70 dB and1naf ;egh, qf)cah* .,uh;onbfcsu:8 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. Wha2lc3 . ons7puft is the intensity n fsc 37lo.up2level 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 a source that is radiating equally in qf 3gw1 nf50wh k)t 7yzck*x3*a.. avykt ph/gall directions isk *53 g *ayp/w y k0kc 3tqn1.xfzat7.)fwghhv
$6.0 \times 10^{-10} \; W/m^{2}$. 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 radiating e8xzl0l * 8xl8vtynka4c1hp5t qually in all d8 x88 n45vp tctklha*yz l1xl0irections 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, which is assumed to be uniform w0ym-i laj+q,9:lal rly distributed in all directions. What is the intensity level at a distance 5.00 m from t9, mjla alwri+-:0lyq he 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 frzi yt(y8nxmw sfz 0:t(;3er2gom a barking dog. What would be the int (3fy2w08 ( gx:t;zyie rmnstzensity 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 6020 9oqzb2lt3z yzanj3 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sourajz z0yb32 t2l3qnz9oce 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 what dista- p-vl28 zgptcm h,kl7nce will it be 75 dB? 72,klt-cm pgv -p8lzh

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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 tl*m. i)u yithm3b.k/complex tone has a frequency of 1200 Hz. What is the frequency of the fourth harm./h)lm*tym. i3 itk buonic?

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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. Whahyr yah)w6* 6wp8d.ku:,ih 7z lm*kvp t is the length ofk) 7zu*8a.i6 pdl yhwprh6y h*m,kw:v 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 of length L is 400 Hz. Wha kzy ;4.mtss-bt is the frequency of ths;bm- ktzs4y. e 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 o lr(g+huhv1b 2f 0.80 m. If the velocity of sound in aiu bh( rv21hl+gr 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 qiqidbf+n4 7dynasj e7w;- ,9a 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 clos /fp efn)- j;-vnfxa.xed at one end is 330 Hz. What is the frequency of the third harmonic?n.xf /xj pe-vn-;f a)f

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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 hibfs:va/;w ;u8,dy j53ms th a fundamental frequency of 60 Hzs: j5hu8/y fwtdhs,vm i;a3;b 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 wheres s gc.l 4kd(nxwn* xg(z:684z3vbqde 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 where the temperatured;zwhs6r jhb8lur,a0v8u (a, 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 rwn-u+)t )i/ a2 gvezowhen the speed of sound in air is 340 m/s. What is the)aw z+ u/i)ov ent2gr- fundamental 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 other isd6 bw(lf- 4w 39pjrfe/gy,a gd closed on one end. If the fundamental(/4-e3 flpgydf db9ra6wgj, w 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;x:;jepi hc3h 9ji s+q 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be 9ip;3js h q:e+ jhixc;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 pla0coi)ifyw 9* :xh*mwx 5 mra0,4pqcotced side by side and driven by the same frequency of 500 Hz. Ipc 9mfm**5hqo ,0a w:xwio4t ix)cr0yf 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 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 thes /sq56bc8khyfk(ym9s g4(9-bxxkp r 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 frequenlf gj r1.m+ 12j8al uebvx;f,ncy of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of g+8n 2xuafb1,l l r1j.;jfe vmthe 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 o b jow+ b+ff*+x3 p5uk8qi6vlare 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sounjb klw6 ipvf* +bfoxuq 8+3+o5d 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 orchesttpbr l2x g0r3d,q(x(2r3qzchra are found to produce a beat frequency o,grch(rxqqx (b 2pt302 ldzr3f 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 approaches a stationaryd9 -c6vi epesgs c5dw 17ck1)n 1000-Hz sound source at twice the speed of sound. The observer hearsc v6de7 s -skp)1wgn5i9c ced1 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 egu/k u*v l0kfjfd9;3frequency of 1000 Hz) approaches a stationary observer at one-halfue*;0gu l9v kdf3jk/f the speed of sound. 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. If a listener moves with a speed of 30 m0)oubsrwps vh44b3 s//s away from the source, what is the freq4sp 3o u/)40rss bwhbvuency heard 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 szk 7 /qdi y95an)c,pe9zoocn+iren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of freq znon 9c)a/,yci ko95+ dzqe7puency 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 statioig 8( ml01e3y,gje jftnary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of soun,fg8(tyj3i jl mg01eed 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 whistl. zo rsg1co,i3e. Take the speed of sound to be 340 igrz,3oc s .o1m/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 blows itga.mlo.wur71 s 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear 1 .amow7ug.rl?

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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/ey tcf3bv 8*)so9x7jth. The train blows its 400-Hz whistle. Take t3tv7bjsf )yco8*x et9he speed 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 whi2d.t4sb n9zs gnx5 7uistle, and you hear a tone of 400 Hz. Take the speed of sounngb5idn s4z. 97 xsut2d 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 twbg:, uft.6edhe speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speedwuft.,g e bd6: 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 air is+ir+ke wcp+u ba 2s0.z 340 m/s. What is t +wc ark2pz+bieu.s0+ he 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 objldlbemo(y1 8.ect. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume thbdy .l olm(1e8e 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 coya0mw:h fffzb 8.n jd; b+ 9ilw,/*grcnical shock 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-an1n 5 uehg*gq uo0e1w,cw9i fy5gle of the conical shock wave f 1i5u*fo yeu enwwh5 g0g,19qcormed?

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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 Europe with 39elfqheick: z)j wc j6s2k*, a Mach number of 1.05 where thh*el )cwq c k2f:9e6jzski3, je air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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