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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 st 3c+c kthvey47atement?

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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 fastekp* +ncv:czz +st 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 steepqs.s1.fxz :k l 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 increa :vvz (8c2rrnsses, what happens to the velocity of sound? (Assume that all other factors remain constanz vn 8s:vcrr2(t.)

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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 3s5o:6 mak:)lcdq5g oq;ao h. cboky+a 400 Hz sound, the velocity of a 200 Hz sound through a;d ylkhoq36q:cmo 5).s gcob+ko5a: 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 ojhqoa8 /7dxu- 18dn qe(in9 vof a 400 Hz sound, the wavelength of a 200 Hz sound in air iie9d8 xquo17njvn /a (qd8o-hs

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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 20cvzadz ,qs1/ r1 *z*oq,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 freqspbgw)x8ule f7 lha9ji-yqg9e, 3 z91uency 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 emitt79wlxzt qfz 7xmb/g :0ing waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of t07fxbm/g7 l qzxzt:w9he 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, inte lu0mrw/+ cymi:2brxv- k+zk5nsity 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 distan1 xo w+ kfmi5t ld.x9(pm2n jk.bw,*pnce d from the source is I. What is the intensity at a distancemiw, f.p k(9+xbn.1k5noxl*2jdm pwt 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 source that is m blyaa-lux5w3 x9 3+vradiating equally in all directions.lm3 5vx-x9 ulaw3aby + 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 distancjam7/,yev7m7 fr7 dg(d*k ay2qdy/ lge from a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It d /y/va7m gey2(m7rf77dl *kdd ,aqgy jrops 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 aoc-*gvy:n .vas 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 , urdiiwpkr0scot 8:83y:jn 8a speaker emitting a pure tone. What characteristic of thcw8 u itj0 :k,os:8p8r ydnir3e sound 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" of a musical noekn8v:fy gc 2+te?

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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" ofxb+6w 7hf bbspq:or.7fwbrvgp - )( ,j 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 intonrd*)7f9s sf c).orwq(rc ju ( 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 areckdutidkz- +. :n;bi-

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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 wave generatqknfd0 + 5 5fa:kdk9wp7hpn zpb1;u)zed by the guitar as a result of this vibration. What do these two waves ha: n;q9 1pfpzu5 dzp7ha50nkw+)kkfdb ve 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 hsyic 3bg1pc a 0+.m2 mbg1l0uat 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 wav,d6+oa3 o05v trta tvpelengths of the three lowest tones produced by this pipe?pvaa06d+r tot o3t5v,

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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 lengxxbh9 ap: 1f ;:p:dqvxth L is 200 Hz. Which one of the following frequencies will not resonate in the xx:bpf9xda ;q: v1:hp 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. Whip 5cdpu1 a6 jlc zy;h 4n;r:+y4lylc9ych statem6cy: c y;uplralydh4 z;p5c1j4nyl9+ent 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 closed at the other, thswc7j1cstm pf7e2t3u b0r s5- ere

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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 *)ug jssnzok3, / zfay4u9 us5the three lowestysuog 5) a/4z n,k3u us9zs*jf tones 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 lxcra+795v1pjk yo x4 of length L is 200 Hz. Which of the following frequencies will not resonate in that pipe cyxaj+97rkvopl51x4 ?

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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 fundamentkp481xe4ds(ou3qtb n al frequency. Which stateme np4 xk3 ou8b1tse(d4qnt 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 .xobftwe6 ef94+r6a a the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is o + 6.we96bffx4ea rat330 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 + 0ivt7uu9grx)w pz /cgxvp02 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 partic23jidz9ypj 5aex dy0 :; uezo,ular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased?:pdei z,z9 juya eodx0;53jy2

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exg)u gvuh((q; ;j-fppe plains

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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,/5zsa4 shoua stationary observer. The frequency heard by the observer issa4,zo /su5ha

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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. w j(.d ,t53alxx wl(ku The frequency heard by the obs5awuklwd3 (,.xtj (lxerver 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, itsqep+t7r8u.ss*rc 01 aoy*mkj8cagkv kgn( (. half-angle will decrease by a factorn gkcqps 8 (1( sey *k.u7o*kr c0aar8gtjv.m+ 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 soundhq:/6/nrpksk n8 d57b nmpxj : of frequency 45 kHz in air is 352 m/s. What is the amps /qnnp7 d:5rh : kx6/jn8bkir 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 sound,zogy. mn2hm7 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 baqp7-mg 2vj n;qw wx;y,g4yf 2dt emits a shriek whose echo reaches it 0.0250 s later. How faryf gdxqny,7;w4j-pv qm2g2; w 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. Theok1/gij)gl83ir 3 uo(eq) egc 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 o nc:2dbqj lu9c.:l 7j h+ltdu6cw1l 85.0 s after seeing a flash of lightning, the distance to the light l6 : 9cwl.cd8hcuu1 b7dlq:o+2jljntning 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 temperaturpd h-ry9 jz2k*e 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 later. How del2cbv (y+ y1rkep is the well? (Ignore air resistance, and assume the velocity of sound is 1vcykb 2 (yl+r340 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 wav j85a;*9kq bkeh -6qdh0bcqr ee 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 at*pt2l s1cy8zr:a ,tvb $23 \; ^{\circ}C$ 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 :adrwzuo e/;o79p,cm level 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 p6*s3tt ;ixg i70-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 i,ri0e t+do/v;/ll nj intensity levels of 70 dB and 40 dB0orivn;i/,le +/j dl t?

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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 autp p60kz+-ny- ( wkythe intensity level generated by one engp - 6uyawn-ty p0kk(+zine?

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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 distayti y 0wkwh:a1i9yn d 0q5i/x7nce of 6.0 m from a source that is radiating equally in all diryi 0nwyiwaq9ykh1x td:50 7i/ 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 source that is radiating equally i xob4u z2-qv(cn all direuqb4vxc2z o-(ctions 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 assu mslp: l/vp3x/med to be uniformly distributed in all directions. What is the intensity level at a diml3/ lxsp: pv/stance 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 bark:f(zj3we cxh,an- y/ uing dog. What would be the inuz( n-ex:w3h yja/,fctensity 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 intensitym 7qq,bt zctw,6 tjj0+ level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? As+0,cqj7tzmwqt,6 j tbsume 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 g1(q-luuj y0( kq;h/bnqmy r7point source is 95 dB. At what distance wij y(/ 1n(qmku-r0lybh7 q uqg;ll 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 com2m q +pf,aqy93r5g vfiplex tone has a frequency of 1200 Hz. What is the frequency of the fourth harmonic5r 9pvgqam, fy+ ifq32?

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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 25c*7 koig1l:mpncbxk )i lf8x-vj4pharmonic of an open pipe is 900 Hz. What is the length of - : 2cpxni7b)kvpxm1kjlclf* 8o i5g4the 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 Hzj)wh+.h x x(tltu0zq7. What is the frequency of the lowest toxl0 uwx) jth z7t.+(qhne 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 au.teh -suej+y/i fm /6t both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second hajt/uu.i e + f/mhsey6-rmonic?

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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 wh zq zh11msi8m2ere 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 frequency0ao0r v; jfk9sokb3h4 in a pipe closed at one end is 330 Hz. What is the frequency of the third harmono 0koa3k ;rb94fhjvs0ic?

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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 a nl ;w6m )vbx,.tf6cnm8v2tiv fundamental frequency of 60 Hz on a day when the velocity of sountv b nvtclf6,ixnm;wv68 m2). d 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 is;233 9 e yfqqoy5cdurj $20 \; ^{\circ}C$. 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 tempe+h tmmrz;.0m: ta otg;olm8p ;rature 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 playesigz()108byeosus x,q3 x g/rd when the speed of sound in air is 340 m/s. What is the fundamqsos1)r80ie(zg ,yx xb gs/u3 ental 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 the72zwiv9ni*x j same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamen7*ixj i29 zwvntal 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 air3lztt zv5/ 7yr 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 t7ly /zzrt53v 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,tho 8k, ho7vt55 smhy 500 Hz. If the distance from a person to one spk7 ,mts hho55voh8,yteaker 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 tvk(8y4ys r xjlw .hcew+l tk7 .h-m7)khe 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 freysmk39iwbbczf29o4)o, g( j; br vrh8quency of a musical instrument. If the tuner hearw 9,h2g b( 9k 3b;o4ymvf8srizb) ojrcs a beat frequency of 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 sou 8pw*gj0po n9knds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the vel*p98w njg0okpocity 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 stb(xgz/hd: yc/+*nc1 m;c utx wrings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is :ub h+n( c; xw1cmztg/ /xyc*dplayed. 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 stationary 1000-Hz soun8m bpq6ufjp t(o;h.* md source at twice the speed of sound. The observeu 6* b.mm8;jpqftp(o hr 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 observer acc); 8 r*n1az7d tbyist one-half the speed of sound. The observer hears a frequency ofytzda)8 * rnc71;ibs c

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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 lj p.o2ubqu0 6l4wev:yistener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The so6ov2yel j4 p.u:qubw0und 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 travelt5sa 5ms3dp*q9dgmb;,ln -ah ing 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 r 3massmn;a,5b9hdplqt-* d 5g oadside. 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 stationary observer when a train approach0; bf9achsclr b 160p+(kut sjes with a khp019j;(0+cr6tb laf uscbs speed 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 train blows its4r: g49tf8woaq2 p rkks o5c9c/-ni lm 400-Hz whistle. Take the speed of sm2pwo5la-:ctq8k fn 4kc9gr o94/sir ound to 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 blowxe3j uyw(n5e( s its 400-Hz whistle. Take the speed of souwn(e(xuj5 y e3nd 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 tzgu-jq/v9wz, rain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you,gj/vz w9z qu- 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 ayo.x++:l7hk+cadzbv)h2xh fkg - y/g t 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of soudakyy+z:b-/)hkox lfv h7c. 2h++ggxnd 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 speed of sound in air i mx7vg;6k;3 d6 ai1ad/uaf ehdd tde:/s 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed of 30.0d dik/d:fauevthmde ;/1aa;63 x7d6 g 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. Assumehiokg4j .t-/xrcgg+ 9:ieg e. f,zay8 the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s.ggt,agr-jh: k 9zg8efoyix c4 +.e/i ?

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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 sign3zq *j)yon0 .hktvmd az.*ccr2 7ls7cal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object movv cl m yscqao)n7 .zj*07zh.k2rt *cd3ing?

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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 d(z5a4d )ul6 bn e+pnqa 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 Ma nu mi6-y3; qox:k(bw)ykfd.v ch 1.4. What is the half-angle of the conical shock wave formed?:fk wv-m3oy;nuk6(byx d .iq )

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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 M( f d19kfeoc:zach number of 1.05 where the air temp1k f(dz 9oefc:erature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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