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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: 游客未登录  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 followi1(qjyw +cb94m-oth *pifcn 3nng 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 conducted fastest thh 0y;xk vot3u sq84,54+onxpie wema2rough

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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 roq.ygp/cnp,fn ( r/.khd?

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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 ln2cp+lyda;*, 8iagie7(ys/ ozj u7a happens to the velocity of sound? (Assume that all other factors remac8ua7lz+ g2 7,y( dojs/*;ieliyapna in 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 velocit 3 51 xoc 11t7jvv jvutf;evclc)ns6n6y of a 400 Hz sound, the velocity of a 200 Hz sound through a 75cc1 otnvlj3fc)v t 66vxs;uven 1j1ir 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/9n:vyp5c+ mv.ew j gvxg+z b8wqz-x7fzl x-8 sound, the wavelength of a 200 Hz sound in ai7 nxzg- wv cx/wv9v8em z+- +p.ygfq x:b8l5jzr 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 than 20,000 Hz are m u-fs(u d(r zbir,)y p)4 vu4hwe0)xocalled

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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*sug to4bg :0l 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 wk0kf4-zhgz0/7vt hjo qb.* fall directions. If you move to a point twice as far away from the sou-z /kf*v7bh jqwo tk.40 zfh0grce, 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, intenspez w6 y,6bt0wity 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:3hc bmowt*jw . *emwwwv7u.t2zp :+o source is I. What is the intensity at a distance 2d from th*emo+*z::hct.p.owjw2bw3wtwv u m7e 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 s(v*7tledtwbmi 8 c,g* ound source that is radiating equally in all directgwm78 (*t idc l*bv,etions. What happens 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 sod faall8(rv*/urce that is radiating equally in all directions. Wh*aadf /r llv(8at 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 a soung:dxqcel0j 91d 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. What char poa ;7+ esm0nz)xvm s)gu;ljy7 y2y1cacteristic of the sound i7cy e 1oy7a; nmgxv;l+mp0ss)u2 yj)z ncreases?

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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 tbxirpzz1i67b6(ivek7 d 27d 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: 0pviop6-b v3 bvyyc:gtr2 8g" of 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 from air into water5l;o.yy k,;ea9*rwi) m rdkz x tqjq52

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacema+1rx90qr q*yl wj7y yent 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 wwc k74hqr be*,ave on a guitar string and the sound wave generated by the guitar as a result of this vibratqbrc kw74*h, eion. 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 which is open at both ev5. z1dr skbi64u )qacnds, 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 o v,i7/ swrsdr 7cf3i0rf length L. What are the wavelengths of the three lowest tones produced b 3d,fc/ri 7 sws70irvry 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 resonatd- z:11mwbke 375yane xid5xpe in an open pipe of length L is 200 Hz. Which one of the foll-b753 dx 1 peyadxnz1kwme:5 iowing 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 ymfns1dfp y,;ue0 .1)fn 1elh L is resonating at its fundamental frequency. Which statement lnse.),edfyhnpu1yf0f;1 m1 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 one end and clr(8b. 8q 0:1j ihh/yvve -iccjr3o5v; phmljoosed 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. What are the wavel;vy1w itq zz+g,-3kay 2ez ir.engths of the three lowest tones produced by this pipe?zw;z y2,tg-e+iqk3r.aiy z v 1

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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 3ump z2sie)4cthe followszp) 3 mcu42eiing 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 f (9rwcg)3q;1nvg olw is resonating at its fundamental frequency. Which stateme wfgq3r;9 v()w lgcon1nt 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 speakers driven by the same source. Each speaker ml s nk ,j4rpi8x4/gcc4p8(o9xgl/nt produces a tone with a frequency of 200 Hz on a day whn/o jlxs8gxl nrp4( 484 /gitpkc9 ,cmen 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 beat(ta-64ns tl bbfclq 8-ahw.1 ds, 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 particul;s )w..xk mixfar beat frequency is heard. What happens to the beat frequiw s.xx ;m.)kfency if 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 explah8uqpo (6 g+qains

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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 gxsy5, ql0 i5a-pqo877rerxr by the observer ir 0 7qr yegq-8x,75p5iso xrals

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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 observehe o91jk+ n, qmid,q8er. The frequency heard by the observer d j+8qnqmo he,,i9e1kis

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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 o 03fvm//fgh*n8ni soto double its MACH-speed, its half-angle will decrease by a faci*8nm/shf/g fo 0ov3ntor 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 352rfzc4q u+ i(n6 m/s. What is the air tempeqc6r 4zufn(i+ rature?

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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 speak tyn8c ,qixq 0h1bie07+w:t ed of 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 batz3a, ne3v zy-0k wx-yf emits a shriek whose echo reachez-,a0ve3z wk 3n-yxyf s 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.) qn:f lyu c,-c)ghtr500 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, the distagw bpunqm* bw0:*kjq : .v15hknce to the lightning strike is p0 **jbvn5hgkkww1m: :bq .qu 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 temperfrco 8 4nf)ht6ature 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 ayod1 uowvh-14 zdiz1n l/e( p* deep well and hear the splash 2.5 s later. How deep is the well? (Ignueizlz 4ddy(o/vp 1- h nw1*1oore air resistance, and assume the velocity 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 frequel9g) s3d+g f,g1ppwvtj,ud (sncy 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 4i 43qmf/:s:rwdfma r$23 \; ^{\circ}C$ 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 levellusv2+px 5jb , of a 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 intensity of a 70-d,qm s*b6:dj vmB 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 *bt44 o7vmu/ctu)d x 7pm qg:usounds with intensity levels of 70 dB and)o bqc*guv /tt4m uxmd4:7pu7 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 zbql4;gs,vl.15 engines in a garage is 100 dB. What is the intensity level generated by one enb, gvs l.lz;q4gine?

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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 +8mvex dn*j/t n7y-kmof 6.0 m from a source that is radiating equally in all directions m-m* txk7+ 8nyejv /dnis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 sourtoe)lb c-0 zn4ce that is radiating equally in all lt40e)bn z-codirections 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 b:tu5cd9n7bg).ep vrr, which is assumed to be uniformly distributebcueg 7) dn :r5bp9vt.d 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 24vfp,s c .kbkwjquwh. 6w+:c8 ,qilodistance 5.00 m from a barking dog. What would be the intensity level if tw w6wcckf.i ,4 .ks: 2,b8plv+qw uohjqo 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 yw6pa-hwrv07 m(pom5ms ln6.a sound source the intensity level is 60 dB. What is the intensity level (in dp6y-mpm 5l.76vmwo(h wrsan0 B) at a point 2.0 m from 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 what distbcgr5y d- v4t0ance will it be 0 r4 -dgc5bytv75 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 f 0(-ewp)9a /9nall(giti c dqarequency of 1200 Hz. What is the frequency o)egqt-a9/0 (pldiaan 9lcwi( f 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 harmh9t ;gjz47 eehonic of an open pipe is 900 Hz. What is the length of the p g hh;j9eze7t4ipe?

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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. What is th 4lm m*o*,wgnge frequency of the lowest tone that will resonate in an 4m*g o*mn glw,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 velocity of sounugkgd(d 7h4i fe2riuz8+q/,c d in air is 340 m/s, what is the frequency of the sec,fdeuigqg 2+8/z(h7d i ukcr4ond 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 whereo-m65 -1 awvqb)ng xy hgl8+ap 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 oloxc1.oel) *cne end is 330 Hz. What is the frequency of c *cl )1eloxo.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 clht gu k-13bbk-9/iq3hm oco7iosed on one end that will have a fundamentaoho -qc3bi1kmb-/37h 9 gtukil 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 the temperature 9 2nx/ufs2te/hz 8+ xw9ti piois $20 \; ^{\circ}C$. 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( h9q:zc dxcs8cd ;xk. a room 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 lejgx0sht l d3/l;.*ap5e-hs if ngth 0.75 m is played when the speed of sound in air is 340 m/s. What is tp ;tlag l/5hfji-hs.3 0*se dxhe 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 anfa8e17 nl8td pd the other is closed on one end. If the fundamental frequenc tpal d1e887fny 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 frequencyzd sq+jt6cd;t9(uz8 um7 -plh of 800 Hz in air where the velocity of sound is 340 m/s. How much farther ba ( z 9zlqdcmp-ttd ujh86us+7;ck would source 1 have to be 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 placed side by side and driven by the same frequency of 500 Hz z :cptf6/vzjg8m.+d( o 6kkho. If the distance from adho.m 6f6 toz kvg/: (cj8pk+z 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 the be3c1kxqal2 d h-p8str6ok3x / 5z4ykwkat 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 frequency ofe, j*bit kv.c5zq-ir* a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency oi bvtqric*j5*k .- ze,f 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 and9j a) xjb 7-uribsmg6/ 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of soun9b )/7j brujmgsi6x-ad 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 orches 7 d- ltqe7y8ht2j-s uaed:z:ttra 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 brint qd:j- ha: z77ld uyets2t8e-g 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 approachba:-(u nc4 v* 7ibkzmft 1qks/es a stationary 1000-Hz sound source at twice the speed of sound. The observeq 7 b n-/bus it*fakmk:4(1cvzr 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 oat4f88v px.g vq3i:l cbserver at one-half the speed of sound. The observer hears a frequency oat i.p vqx c43lv88g:ff

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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 spedpd rf4 5f2q/ffsr 7dnn jk*,o+vjm .:ed of 30 m/s away from the source, whard/q.5 on+ rsffp4djf*v2m7fjn, : dk t is the frequency 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 siren. It is t7uzuhn kxun3 /u,+-js raveling 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 frequency does thenh/u- +7u,knuzxsju 3 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 xee7b fpyb0mq0qtbhq: fd-)l*t0 ej yx(v7;-observer when a train approaches with a speed of 30 m/y)70(v- ltp btbq 0jx0he7:eyefm;* fbqx-d qs. 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 afrhxb99-n k dni /lfvkz*l1b8 n:7p/xt 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound tk-/pkf*1:bx bfx nzr l /ni8h9nvdl9 7o 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 blows jyz8p:6tlfm (its 400-Hz whistle. Take the speed of sound to be 340 m/s. What f:y fjzm6(tp8lrequency 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.* k5 .pfxl kd)ud;sat train blows its 400-Hz whistle. Take the speed of sound 5kdx; .tlpdas)k fu.* 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 wh)o4bf wnuo0.u istle, and you hear a t u4)owf.oun0bone of 400 Hz. Take 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 s4ci2 mpr)gvf+7:pui(g5w l vl peed 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 speed of 3 vu7m: p vw54li(gl icp+2)rfg0.0 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 340c :h hj6w+)mea m/s. What is the frequency heard by an observer if the observer is approaching jec6+ wh mah:)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 objectiqy*t+zk+sx 1 . A 40-kHz signal is sent out, and a 4zi+ks ytq+ *x12-kHz signal is 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 wave produced by a superson3wd)qc8ct ,m sic 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 (op hl :j:xrx1exo yd5v:2h bt .y6fu:1.4. What is the half-angle of the conical shock wave:xv5bljdp.o f yyt: 1:x 6hxu2rh:o( e 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 flies from the United States to Europe with a Mach nu 6d ao1/zsc/j(a 0mtn- ihh6i7/ueb exmber of 1.05 where the air tempe-h6/eciuo/7(hsd at1 enbmj/ a 6zxi0rature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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