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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 pkl)xf8 w)b 7dnq(em+-t/ x wgfalse 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 conduc: e jvo7/etfv6ted 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 siz/8xtqki 5aojm;9: n teel 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 happenm. lgy ne-j*+qre h1a.s to the velocity of sound? (Assume that all -n l.r *g1+yejq ea.hmother 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 velociv*rtv kg w-0t1en; a.cty of a 200 Hz sound through aivn1r g*ct vkea -wt;0.r 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 sou-a7wkrm4 j, 3dlqyqa 9jah.a:nd, the wavelength of a 200 Hz sound i3awaa 7ajl9h : q4.r -kdq,mjyn air 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 c1 zk6fyyqd 8syk+( b3malled

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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 than 20 Hz .bbv 7d9dpou;77ce udru*h,v 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 emittink h6 8nnxvhr.)jxa:v4g waves uniformly in all directions. If you move to a point twice as far away from the source, the f nx:k6j4h x 8r.vnhv)arequency 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, m0qg.t8ln1jaapmlo.b 6-7v/h wa: wwintensity 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 distancecy *djl,k xf 0:w/8g ltq7x1oa d from the source is I. What is the intensity at a distance 2d from l0f1ao,wcg j:yqx k*7x/lt8 d 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 radiating equallypfm(l)*wr t+c in all directions. What happens to the in*l +(pw)fct rmtensity 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 source that is radaxgl-yb+8r .t iating equally in all directions.t ryb+gx .-8al What 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 soun pnt(57azbbak6+ j5ww d 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 charactb 6xvf(jre),heristic of the sound in, fr( bjhvx)e6creases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" ofzg y qr81bpw-rpp: 2.i 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(wef n6 d2krvw2l; - rzcxz9g1 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 wata6mvg l; s7t4ter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementtqzn8 ,/x1skp,t9 p:8uk yq cp 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 wave on a guitar string aq6owg dio1(i(mvg-+ scyz3uq je e+ 65nd the sound wave generated by the guitar as a result of this vibration. What do these two waves haveo5 +w eg6m6czgod -ve(qsi(u+iqjy13 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 whick m b+f(8vvxe ;/q6xmfh 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 thic+zq n8a,/p*/ge(o ,wxoor rwkf2 6fe three lowest tones produced by/nko , w8rr,q6wp xa/2f i(o+gzefco* 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 Hz6yf9y;stw ;6jj s g7zdv+8 6,ykbp kui. Which one of the following frequencies will ny g7ku ,bifvdyy;wp;6t86k69j+j ssz 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 resonatiyw60 ety7u w9rng at its fundamental frequency. Which statement is correew9 ytw706uyrct?

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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 openzhneo( ne*f 8g1gff7dh zj3 :eg6:gp2 at one 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 lengt)by 7f*uz2avja+h p. 9 cilda8h L. What are the wavelengths of the three lowest fb alyz a2d8vij 9+c. p7u)ah*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 7 axscyj4:)mypipe of length L is 200 Hz. Which of the following frequencies will not resonate in t4:c jmxsy y7a)hat 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 3frwhktho; (6 end is resonating at its fundamental frequency. Wh; 3f(hth owr6kich statement 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 s 4x236ibnuw6ccytkg sg,2v7same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of soundny3 ws6x,i bs u7tgvg42c2ck6 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, the two sound+6*,2 u gken:j ftochx- rxfz. 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 foat9:7dag1 j :2ghnshrequency is heard. What happe7a1hj:hogt9 s2gna d :ns to the beat frequency 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 explvye 4c:8f 6sbzains

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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 frequen(aa,2 6ulea 1sdtmqb: cy heard by the observeu sa1(l,:6d e2amaqb tr 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 fr n- fn7kvxa oxzja ls058*vy/,om a stationary observer. The frequency heard by the obssn-5,* 7kaao yz xnv/lf 80jxverver 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, its half-angle will decrease by a 2n/+qcmsr0zkdt ykgy c 4254 m02fgl jtc 4/ 04yg+2dfkmqysl2m zcg5jrk20nfactor 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 ofm-q(qs5hmkoa )9nm 8 e frequency 45 kHz in air is 352 m/s. What is the air tek9h )m8(asq qnm5oe-mmperature?

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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 sounu ) d a/ss*vy5yrn2xk)8c )flfhbp5ye8fwo)9d 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 bat emits a shriek w4c97: chj-6uzavxb6w c g9mig hose echo reaches it 0.0250 s later. How far away was the object that reflectei 67-mgh4jg9ccxw 6uv9baz:c d 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 heurcp+8bjlh f25, +hyx/ixw88ook 2vh ar the echo in 4.00 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 a- 3+u tpuf8nj7xt;t dnfter seeing a flash of lightning, the distance to the ligh td;7utn n8x tf-p+3ujtning 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 srh r32.ms9wurwh;u f d -zrt6) from 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 lrdg e,u- j8ali: g g2ob5gj:d/ater. How deep is the well? (Ignore 5g/dg8 obej,a ujigl 2rg:d- :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 fk ,a1*xxqete 1k/q8 ; wss:qhprequency 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 3 ))ktzcq2bmp 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 intenz(fzz r8)ab dmcpy+6*8- w czr 7ys)vbsity $10^{-3} \; W/m^{2}$?

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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 sbj55,hb v7a*hdd:+ t3qeasly tjh- aenv2, n.ound?

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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 le5 h;atzbq; j4 3lr(vstvels of 70 dB a tatvb4 h rs;zj3ql;(5nd 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, j:w 3o4ddd4g(z3 ql hcr0olw is 100 dB. What is the intensity lho0d q (3w3r4wddl4,oclgz: jevel 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 disv+h z0h xhz:z f8u(k5fa1b -entance of 6.0 m from a source that is radiating equally in all directi8e: zfuaf1-hhz5nz0xv+b k( hons 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 equ6b(t y2,s hiy2oh9ukv ally in all directiohhktuy(2,6s9b2o y vi ns 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, w qksmzbi -6hy1a :q39x me2:gxhich is assumed to be uniformly distri9s:xxmazk :y eh 6bm2g1iq-q3 buted 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 distance 5.00 m from 3 a cfbm -*:r-ww5wo3 mv,nwlya barking dog. What would be the intensity level if two identical dogs , wrmmlb53*:a-vw cynwowf 3-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 60 dB. z 3izdr p6 cunp* u.fx3:n9x0b What is thep.xzz3ur6 f ib0d*p39n x: cnu intensity level (in dB) 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 :nlalfj 8kufske- .., a point source is 95 dB. At what distance will it be 75 d,l e:ska fl.kj.n8f- uB?

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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 fremfmd m jf.-gj 4pm(u2 (svyawz5*d)(equency of 1200 Hz. What is the frequency of uv2(wf4g 5m. mm-p a)jz*msfdey ((jdthe 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 harmonic of an open pim z,8xcshl;r5i dke6, pe is 900 Hz. What is the lengelir;,c s6m 5h8zx,k dth 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 resonate in an open pipe of length L is o;idna j d.;+k+frp s1q+0fto400 Hz. What is the frequency of the lowest tone that will resonate r1dq +isa;. t;pno f0kfo++jd 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 velp7ca-lk/h xdtl0r82w7gilxcqmu0 49ocity of sound in air is 340 m/s, what is the frequency of the secondc8 0 qxhi7dwluk 9p7x/2 rl mgtc-l0a4 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 nyzrlpl*8r0y/(d4tb 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 frequency in a pipe closedfzz5 6,x9wj)zyu e0b-syqip9 at one end is 330 Hz. What is the frequency of the th6 w 0i )5zze- fuzs,xyby9jp9qird 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 thv:gt1bt-ds 4a e shortest pipe closed on one end that will have a fundamental frequency of 60 4gsbvtd1-a :t 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 roro 6pwi, ;/m 1/cf tf 7lgzlv5kf16qonom where 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 temperaturk9h8chb5 ndei5 i k9r0e 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 r7(7 kuw4im otplayed when the speed of sound in air is 340 m/s. What is the fundamental frequer4ok tm(w u7i7ncy?

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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 o*lgvqb 41)va yther is closed on one end. If the fundamental frequency of the open pipe is 3y4q av) lb1gv*00 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 ;bkopm1hr/ 6ah0pub.2m lxj5emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be mov h;02 o.b/b1p6m hl x5uajpmkred 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 frf*pk.5j6 tt qfequency of 500 Hz. If the distance from a person t*tkj5p6. fft qo 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 beat frequencyk,o w,yxxaf+,?

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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 fornnsoo1lms j1 7pm( 7p;k to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the i;mosnp ljsp1 1 7mn(o7nstrument?

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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 6u jr.gjxbf* ykr4 q4y7-je+7k m and 7 m respectively. What beat freque+e *j7yuy 4.r j fkqrg4xb7j-kncy is 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 two violins in an orchestra are found ;il1 r1ewy3uta)livd h0fa3) to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one o)13l 3 uf i)yv1td wlrh;aie0af 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)u+lxg dbx(x4-Hz sound source at twice the speed of sound. The observer h d(l)4+xxgb uxears 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 frxr gwp d,c+ky +jbn,8*equency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observnxy +,c8 b*dpgwrj +,ker 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 clt eq:j m642)n. hgu08q k;nbbbai 9zspeed of 30 m/s away from the source, what is the frequency heard by tj46 icbb lt gn92) .h:0kamz;uq qbne8he 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-Hzlmj7 c7x-1l 0u.ca(.lk)alh(bz s ptd siren. 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)dulc hla71klx(07(b.p ltj m-sc z.a 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 stationary grfroe: 7+0txmts8/ dobserver when a train approaches with a sfomtgr78/x:ert sd+ 0peed 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 19grxhdeuyv1dm) vwxl, k,39 +e( t xf920 km/h. The train blows its 400-Hz whistle. h+ux(e9,x 9xyfv m9)dkl,r13t wdegv Take the speed of sound 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 traiiw b96u r.3uvvn blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequ 9w3buv.vur6 iency 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 train blows its 400-Hz w aohcb/5;;,axi b/dfi histle. Take the speed of sound to b bhc a,/f;di5/aixb;oe 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 yo*zkwj b-8a:qb1- ix blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound bo*q:k jzba -yw-1x8ito 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 f mvchk, u285win air is 340 m/s. What is the frequency heard by an observerf ,mchv2k85u w if the observer 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 speehoxjz7 z- ucl ffh;52tt.pt03d of sound in air is 340 m/s. What is the frequency heard by an observer if the obst;.jxf- o7zh 3t2p0c uzf5tl herver 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 determin0 .bttzze7d .me the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object mbde ttm 07z..zoving?

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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 shocku os zsjjk*)0*sa492s mmso t, 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 theghc4zh*)(9+ e)nigr xdi+xjs conical shock wa)+nix ig cgxj4 dr9)h+(eh *szve 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 Stt ( ; m.y;2cbd9cplwclates to Europe with a Mach number of 1.05 where t l9w.tdbmc; cc;y2p(l he air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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