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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 stata*hl on1k0va w*a1.f vement?

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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 conductm )0 2tcx-c8slq n3tvw e:/edced 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 rq5ep-m-i/ fwy wl/q.xe6al jsx.) xr+od?

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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 jc05fso9 w dmw,(pr.b happens to the velocity of sound? (Ass( m b,9.c pwdwsj5ro0fume 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 velocity of a 200 Hz f tlgsgc6)6 h7sound through air is 7 cgfhgls6t6)

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the waveleno xfav0ij:,miko,x4gl//p 1p gth of a 400 Hz sound, the wavelength of a 200 Hz sound in a apk ,imj0xlgio,vx:4f/1 p /oir 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 t s/5; gc0m ddjbde 67udv m0ucb+z7;cgreater 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 frequencycn:3qi;*.0r)j v(x hafa zsos 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 directions. If kc th6( vbfu*ged)qqg /r.*,i you move to a point twice as far away from the source, the frequency of the soun,qg)q h* cu/f* dr ibevtgk.(6d 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 proxkwxe8v- *h73o js zb9:qk7qfportional 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 dist pfwus)q 6-lolh4ao /.ance d from the source is I. What is the intensity at a distance 2d from l 6/oqpush).o4-aw lf 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 sounl 06dkbjq q1i v p 2vi-lxqd/2k/a sw6tk/u+u9d source that is radiating equally in all directions. What happens to the intensi 9/k/da2t kk+1j- q0 xqu/p dlwisui6bvlv62q ty 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 8 hmi3o* f8pnvsource that is radiating equally in all directions. What happens to the intensity level of the sound? ion f h*p3vm88 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 becomes loudeqbp5,+nf32yu wq5s faxaw- p 8r?

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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 bppmto, kh8;f/6a 0n semitting a pure tone. What characteristic of the sound i phknob0pf,;/6 tam8sncreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn5y 2cuorufi ;)w1tab )46belbess" 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 ue;)5 4t4ace80qtk bqffom 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 waz wrj3l3fz37kwwen:)y0n / jeter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement i6uy(qnhs )kj:m +* tj8oixv6waves 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 :,b/ d5f jgdveand the sound wave generated by the guitar as a result of this vibration. Whej5gd/d,f bv:at 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 a6yyu cfoyfw4)/q k3di.0rrbrv . qa :8t 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 tjsp a2a9n(7cc he three lowest p7cc(n a9a2 sjtones 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 resonatec/)ru rni; (w e0m6ima:q6 xdo in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonai(dx6 ): miq/umr;w0e 6onarcte 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 frequenx2v6e. w-ri5lfq1 zezcy. Which statement i2rfe6z-qx5wlv z. e 1is 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 -rt rq p-jsug0)mne09ka a,:l)9d4xdxnp-gw 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. What are the wavelengths of t-gyu2q8e-lu x f 5qpvyu 0p.y)he three lowest t2 0pvxpql5-fu8 u-uyq.g ye)yones 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 length3vjs-; m l:kui L is 200 Hz. Which of the follsk3v;-mi :ul jowing 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 atl-0 cqahh0gr0d 1bj 2r one end is resonating at its fundamental frequency. Which statement is correct? 0 g2rb-jh1a0qcd r0lh

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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 sam ,d d(rhu8b,7rcmmb- ke source. Each speaker produces a tombbdrmru- 8khd7(, ,c ne with 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 be +t l(1ud+yzd.jtargjky i24;qw6 f6 yats, 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 particular beat fre7y9 4*ld 8xkjixb31btb -x:o2iryiqxquency is heard. What happens to the beat frequency if the frequency of one of the tones is incb :yj- 7xb3b xio* xtyl9d1 42kqir8ixreased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explk4axqrrm 1b )-/2igijains

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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 heardy 80+2q setg6xtsjh *h by the observ h6texg2t*q s08jshy+er 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. The friozrv9rn.9x(*;7x8x0e schq,j kw w kequency heard by the observer wz 9*rk7 w0jq9c,sk8 herv;oxxn(ix. 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 dou,dm9 m xi g19(*o0wjygjo,vpz ble its MACH-speed, its half-angle will decrease by a f1* i(0mmgg o9wo9zdxyvjj,p ,actor 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 sonbf +fh/s6rkp e1w6-yw,zoz9g(o *y nund of frequency 45 kHz in air is 352 m/s. What is the air temper wk1-6snp/n9rg,ho6 zf(*ofz y +bweyature?

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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 7blm: lbexrmvr +pb88 6ek+a/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 so/6 -jkbs+cjizx xp8bc5 unhl8n/ r3k)und in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. 6jkljz isc/xk8r-n+ /b unp53hc8) x bHow 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 tejzdr+nz6l 9; .kxcl.hmperature 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 spk+l/asn (,979m vi6x mvo- z kk4awfa after seeing a flash of lightning, the distance to the lightning strikez4ak (9lp 6/7x9k+ia amvfok ,-vnmws 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 fr*nyk e1187t szm+ gzemom 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 latfk;9 2 mcd3epher. How deep is the well? (Ignore air resistance, and assume the velocity of sound ish92kp ;3 mdfec 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 wan;u gvoad48rkx 3gd3-hj6 c r6ve of frequency 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 fyb- )d.dgu a,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 jd(yda rn0m3l,;ekmcr 9m *e9 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 70lp-dg54cbinx( bn .8 y3pie+o -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,r 6:yd hj6/bh/ rximm9o.zh n of 70 d 6. 6:/ mbyjix,hz/hn9ohmrdrB 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. Whatf9pc ho2f m*cy/ih/ 2m is the intensity level generated by onf2im* mc/pyh9f 2/c ohe 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 c2 g8 6e ussa/e+zho0xsource that is radiating equally in all directi/u8c zoesx e6a s2+gh0ons 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 sourcsc5wmo22w nyj:0 1 ks( +l :nab-vacnve that is radiating equally in all directions i+ :wmn1:ao5nw (cs b0kljn2vv 2asc-ys
$6.0 \times 10^{-10} \; W/m^{2}$. 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 abouuy4u*sl .2yqvt 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level lysyqvu 2.*4u 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 5.00kd.)hg4b 1ax+i9n 2jv p 33+tirkubut m from a barking dog. What would be the intensity level if two identical dogs very close to each other argbdak)uxn+ 341+but2pir.hikjt9 3 ve 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 79wopxu(qlax(bee 7,m from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sx7ae (7uqblx9 epwo (,ource 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 pointfu 2s l1ohs qi-8y(;yy source is 95 dB. At what distance l 12iq uy-fs; yo(8yshwill it 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 tonvoj(n) i c5np2e has a frequency of 1200 Hz. What is the frequency of the fj5 vn 2)pnoi(courth 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 H)1 1gugaf-qp nz. What is the leng1g- uaf )q1gnpth of 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 resonatepv t. nsi/qo77 in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone sn.7/oi pvtq 7that 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 vel/ w6b9rowp8jutqz a)254rim e3j4 bqx ocity of sound in air is 340 m/s, whmo8 wq )rj2a qp5 u4b bz4r3j/69ewtxiat 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 room whirgns/j 6 -h4jehm)otwy 21 v5ere 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 pc(hjndk *jnck,5z - 5at one end is 330 Hz. What is the frequency of the third harmonk 5nck,c* ( nhj-5zdjpic?

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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 th9ro c +k + yvirs4e1if+ 2*ux(pzyusk2at will have a fundamental frequency r2si 9e c1u* yvx+k(z4ryfp+usk+2 oi 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 t hbhq gkw(s0,2emperature 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 ao ,/akmsu/+m:uds6hgy o ,f,x 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 length 0.75 m is pyt2 g 1;la 6 7e9neqk4bkp3thplayed when the speed of sound in air is 340 m/s. Wha;p3tkt ky1peq9bngh6e la 427t is the 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 leng aey6 5 w.jd*ui4ke2kgth: one is open and the other is closed on one end. If the fund. jy 4 d5kuek2*e6igawamental 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 ztdkyl/o;wos ) ,sl* )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 source )/d) lszs,woty*lo;ks 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 s j6. exesp)tj1ide and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detectsjps.)xee j6t1 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. Whi64s ej+lx wl0w2cs*dat 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 tuning fork to tune the fne 5yr3qw9( amrequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency o n(rywa5meq9 3f 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 65ikvox- uc+f i.:ydi+,z0t sf m and 7 m respectively. What beat frequency isztiv k:i5 0is-++fu oy.f,xcd heard when the horns 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 twm(a8*wz)xr ii o violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 66i)r( ia* wx8zm0 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 on 2vrg1*aatr50gjg afi 690ra stationary 1000-Hz sound source at twice the speed of sound. The observer hears a frequennatr 56jo0r a29g0 1fi*av rggcy 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 d 3t8bh8iyk/;:xa(ip acuak0ver at one-half the spee;(d k/a:3bktcxu 88hy p0iaiad 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 speedt4,m *g k,zk podwm(q6 of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 ,q *zdk,p 6tkmm(g4w om/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 b:-g-uz u+uj r 9vse2wtraveling 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 chan9 uwrjuv2:b+ sgzu- e-ge 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 stationary observer when a train appro -qmkocaa ,) 9kwix7w/mu24izaches with a speed of 30 m/s. Thi7-a2oa 9i/umw km)c z,kqw4x e 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 +vlaj f3eb6uvd3pof 04 i4,zc400-Hz whistle. Take the speed of sound to be ocvf i0 p34alfdb+ e,vzu46j3340 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 tow:bw/ jqs/yq b,ard a stationary train. The train blows its 400-Hz whistls:j /qbwy/bq,e. Take the speed 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 q vjob hya;1u/4/0yxukm/h. The train blows its 400-Hz whistle. Take the speed oy/u1o4v/ yu; qjhax b0f 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 (d*xf 1 b- :9)uuxe4nhxt0tnm ,fl wgna::l jw120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of f1:n: gdx-t l) jwwnlx*(a,:4xfn0u9u hbte mthe 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 tx .c g3 )5yhjr1f -0aaooa+mlqhe speed of sound in air is 340 m/s. What is the frequency heard by an observer if the obc0a5-.r3 yahfj)1axqo olm+ g server 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 in air +npt2ur3fjl o1g e ;4/jajkj5is 340 m/s. What is the frequency heard by an observer if the observer is 4 1uot3fpj;+/lg5 jar njek2j 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 mud ti(17 ,mfqof an object. A 40-kHz signal is sent out, a,7dmtq imf1u( nd a 42-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 supersonic aircraft is cnym: .ene s/($60^{\circ}$. 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. xcm/o )+lt1u aWhat is the half-angle of the conical shock wlxt) uo +a1cm/ave 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 Unitel0jvr4on3 ag kbm5f9: d States to Europe with a Mach number of 1.05 where the air temperrk9v:jl fb5 og0 3nam4ature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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