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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+zx)p4v.k0u 6 v s dd,tgubhjbaa,s 94 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 throupagy.dzrb 1qh7q1 d) 4gh

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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 rod?h .y -0kkg4lhfyl.b(z

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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 happens ww9oz;.y (x roto the velocity of sound? (Assume that all other factors remain constarw 9ozyo (.xw;nt.)

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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 8r6- qfmxxn4dHz sound, the velocity of a 200 Hz sound through ai8d- mxxq4fnr6r 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.ftd+83lc4c+wq3 yj jcap:k7p)rzw x Hz sound, the wavelength of a 200 Hz sound in kzf +ayj+7 x c)3twp.r3q p4ljc d8:cwair 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 20,000l 4 ;j9v.gj0h;7m:tlweo nwud 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 than 20 Hk;wn zbm-w3go;e ti1+ z 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 unifo7s95k7y r2qzr5o lb qwrmly in all directions. If you move to a point twice as far away from the source, the frequency of the5ok5srrl772bqw 9q yz 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 .sg3f)-yh a acwaves, intensity 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 source is I. What is ec,tsfpo )bf4hv34 2h the intensity )3he4 ohb2 ,tcf p4vfsat 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 dista1f8kewe6v py :nce from a sound source that is radiating equally in all directions. What happens to the intensity of the sfkpv: ye 6e18wound? 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 auqmr(y 9l0z x m6,pui*eo e8t+hsq 0m7 sound source that is radiating equally in all directions. What happens to the intensity level of s 6o80uehey0,t+r *q(m7m uqm xi9pzlthe 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 sound becoeyf5 t iupcxs2: 2x70)agc8zsmes 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 t4eg8 2m m,wfofone. What characteristic of the soun2w,mf8gf me4od increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loud h)(y2ooa(opn0ncm 9y ness" 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" s, m:o4 bqo+96a3/k1hux uih;xd cserof 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 wafy kbt53;r ,xmter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemen3fz6m lq wpvn,08qky8t 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 andlt)msg)-e w q)w5cb2f the sound wave generated by the guitar as a result of this vibration. What do these two )t wl)b )-wm5sf ce2qgwaves 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 b dlp-gew)c28loth 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 wavelengthbmp) uhdm-d2q,d i 85q3o1 t,kniyfe.s of the three lowest tones producedh2q 3),dbtdmi5 yudo.ni -,mk e1pfq8 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.43z;v;g6u l8uc vsz2b1 pqeov Which one of the pvqoelc ;4szug 2vu1 8vzb;63 following 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 resonating at its fundamental freqhg-zineg+- i n477e0mif mu /rib8y e(uency. Which statene-+0 rii7-ihm ez neuf4y8mi7/b g(g ment 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 sw2 zm3 ilta83 64s-;bwuelq aopen 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 length L.ny+r bra if.ye163v0 s What are the wavelengths of the three lowest tones p6s.0f rre1iy a3b+y nvroduced 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 200 Hz. Which 6cn1d6h)yzyb of the following frequencies will not resonate in that 1h6bc6yy )zdnpipe?

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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 fundamental frequensb 5t*p67w or2mw x,wncy. Which statement is corrert52mww7 o wb, sx*np6ct?

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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 tz/ l8 d6h3kpgd7pnf .ewo speakers driven by the same source. Each speaker produces a tone with a frequencl/gz83d7np f k. hed6py 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 beats, the two sound waveqg vz xy(v-k)6z8j/ems 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 anddzgp), (-yhzc a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tone zpy dg)(c-zh,s 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 exp8t3x58 fcdk telains

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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 by the;(jk/n*qck l6.;x.xet: ehvj zn lq5g observer e;cj q5v*kn zxleq kh.g:(jnl;6t./ xis

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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 frequency heard by thekccg(maj v,f,s5 1 vi1j8:j ia observes gvj,kcvaj,j(:1f m 5i1a i8cr 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 bbkcu/9/gm -a decrease by a bb ukac-//9mg factor 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 352 m/s. What wwtluw xw8j97v cmqn e *6-fe3nbw+: 6hylq64is the air t-jnltly q66 vm397w4xe q+8n* wuw6hfewcbw:emperature?

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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(uy/e v2hu.df 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 sosl)dd2 edi 6h6und in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. Howh2i)6ed6 sddl 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 aa8:c-mmg,za ;fs:oj 8xirle3l x )o- tla/ *y4.00 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 after see mkfx++p2o d ;;5z)jcavnlx(hing a flash of lightning, the distance to the lightning aj+2 ldzpohk+ xm5cf)(xn ;v;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 te+ode tzz8 d6dmf;9 x-by lp5/t4a sue3mperature 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)n suqm7o y6ajt076kb a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sq s6b moy)atu6k nj077ound 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 frequiyj:+u1nbv:ck t k2 p8ency 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*yu s4-*64mrr n;wg;ydsogpn 80uhmm 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 withd:liny)omc ,vd. +ry7 aka:5i 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 70ccmi(n: :x+ji-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 vdnx1; 78lbqkzdk:u9) fh(ib two sounds with intensity levels of 70 dB andbi1;8 xndd :hlv )7k(9zubfkq 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 dBbqho 2e0g 9xu6eh7z3out d(u*s da;01htln , h. What is the intensity level g (9hs7 6o*u0 h ;bh3edtdl1e0auntoz2hgxu,qenerated 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 sourvd 1dck69 wg.9;z+piskak e unt+1 xw21yg:umce that is radiating equally in all dire2vtkuds mpe91u 9gag .1zxw;:6c+nkw diy+k 1ctions 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 6.0por ey4(crdy 76r *3l t1ekvj2 m from a source that is radiating equally in all j oc71y4ete6*(kd2vrryrp l3 directions 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 owm,yl6p1 7yamed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the doa67ly1ow mp,y g?

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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;z,6:/ dt vjd .yjcppa(h; aju a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close h; jjpz/t. aad c:;j u,yp(dv6to 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 r9s1c55aozf u. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that thu9f5zsra 1o5c e 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 disl.d:zzylr29u( : a nrytance will r ly:z9nu :.zy(rad2l 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 tone has a frequency of 1200 Hz. What ny4-t-yx/sn3snh 2rc is the frequency-r-4nsync 23t yn/ xsh of 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 harmokfut)+w,i y5bri8a *q nic of an open pipe is 900 Hz. What is the length of the) 8yirbi taqw*kf5 u,+ 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 resonat0, j *od sggh;283d;ruursbboe in an open pipe of length L is 400 Hz. What is the frequenc ;d o30u;bg,drsohgbujr8 s*2y of the 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 of 0.80 m.e-oij zw46 xy 6oq00lg If the velocity of sound in air is 340 m/s, what is the frequency of the seoji0z0 o4y-g6e lqw6 xcond 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 where the temperature ix8seme t;v4w l9 n83r7jec3( ik avi8is $20 \; ^{\circ}C$. 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 one end is 330 Hf*.c(ws g e84upplg0lz. What is the frequency of tu*el. 4sg g(0 lcwfpp8he 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 closed on one end ths g 3sz:wqt-mbs*.u( gat will have a fundamental frequency of 60 Hz on a day when the velocity of sound is bugs qs3z(st.-w*gm: 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 temperat1n1);u gainud,*ip* /dwmkmaure 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 r)h32jnmg .e3rtln.b in 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 length 0.75 m is played whenzx-dpo5*r w7o the speed of sound in air is 340 m/s. What is the fundamental freq x5opdwrz -o*7uency?

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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 is clos jj (yar.)lts ib9s()ied on one end. If the fu )l(9tijsr b.ij()s yandamental 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 emij51b.z,jx0n2: g x6 bc*ywn ys p-xnel,q zx3vt a frequency of 800 Hz in air where the velocity of sound is 3405,xs,b1p3nnl vnyx- bxxezjwy 6qg2: 0jz. *c m/s. How much farther back 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 siowq 8 jl3ovg a62 ky4v4zh5vy*de by side and driven by the same frequency of 500 Hz. If the lh4oy28avgwj6v*4vq z3 yko 5distance 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 xyymt 0y0hhci m,4xzz5:nv)lvpi - 87is 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 frequency of a musical insaw5hr3chjov g nggv :lo exh81.8;+2 gtrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrume2 nv5;:c 3lw. 1r gox8o+hgghg8hjvaent?

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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 and 7 m reyqhs c98gnd hj1+w0j u/l bo;a3s w)v7spectively. What beat frequency is heard whe7v wb0y;dwc1 j3aj)qsgh+ol98u hs /nn 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 strin :qdd3,q/tw2 z,,fcsgaib : usgs on two violins in an orchestra are found to produce2 sdqu,qiafb,,sc:d 3g wtz/ : 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 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 sound source at twice the speed +,m/xtvco3.wb.;np1 x maotpbi kx6 (of sound. p.1cxobtx+/ib p(.,nmvkmo3 x;t w6a The observer 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 observe2ca6i*: ,wnwczjj-az fr y0(s r at one-hal :zz6s j0* -rfca2cwn,yi(w ajf 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. Ifkvl;bo c9n(. q a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observ nl(; ko9bcq.ver? (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 traveling asg o6wr.:4xvmr1j0z ft 35 m/s on a day when the speed of sound through air is 340 m/s.zrr.0gw41s6 mx oj :vf The car approaches and passes an 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 byi9xs0y vinc. rjgl1 tv),(qg: a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 H,sjny0g:v 9)q(r.vcl iigtx1z 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 trx qlhqfssk 3t93- e)t4ain blows its 400-Hz whistle. Take the speed of soe tlt k-sx)fq3h9sq34und 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. p jff 3racfy;: ow;1d( The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency wf31( y jfo :afcp;;rddo 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 kf2yc heb, 3sypyfh 3.4m/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whahhp.fs,4b3ce y y3f 2yt 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 yo70r* o;kg 2voerlnm 4du at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sou4 0ld7gkr*vo; 2 meornnd 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 slxkk xb/kjh 7(:((i-s upk:v 500 Hz. Assume the speed of sound in air is 340 m/s. What ihblkkj/ xsi:v ( s7:-( ku(kpxs the frequency heard by an observer 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. A k,+p1cg+,dkv((k bf f nd;myhssume the speed of sound in air is 340 m/s. What is the frequency heard by an observph1kkb gnfdmc(,d+;,v(+f ky er 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 y cfrv(9e 6(tj e-2dddthe speed of an object. A 40-kHz signal is sent out, and 926d (dt- f(deyjcevr 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 super)uxzf emj) ph6:u+ qo9sonic 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 ha 7b;;lvdc,o- 0dopdrb lf-angle of the conical shock wave formed?d07co; b,d;bovp rld-

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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 Euroxw/ne d7h.v7m,6 i0 ,ymvw svzpe with a Mach number of 1.05 where the 6ni/wz7 hdw0, mvm. ve ,sx7yvair temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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