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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 statem 6 mcp/f0f zk(my ocn6-4ayce+ent?

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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 f-a*/b-s u xitcastest 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 j 8w) )7w6ro7vj )g u5wpbpwhla steel 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 happens to the velocity of sound?/ pm )pf x 3j.d:bhvldavc1-5lj vut66 (Assume that all other factors remain constant6vx lhldaumv 3v /d1j:5jtc) 6pf pb.-.)

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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 velojrq h-arx2)h-city of a 200 Hz sound through ai xr2)- ahjqr-hr 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 wavel c,66ynfy.ybd ength of a 400 Hz sound, the wavelength of a 200 Hz sound in air is fy6y.dnc6b,y

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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 03.zq .gyqveo 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 frequzbwry,e/ rs fb 86:as)ency 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 y9lls tmzlwmh643 p -6r(na/xwou move to a points/l(9pwlr zt nl6x4a-wm3 6hm twice as far away from the source, 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, intensity is prqvm)if+ /u+n) fre* kvoportional 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 m-zx gvwu30*va distance d from the source is I. What is the intensitmz3v *uwgv- 0xy at 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 distance from a sound source that is radiating equally in aywyoup 8. t3om n0nw18ll directions. What happ 8tuyno1y3.np0o8ww mens 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 soun )x xog*0ixz8id source that is radiating equally in all directionsg*)oi8xxi0 xz . 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 rdzubh73vl kh7+g, o9as 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 a speaker emitting a pure to n x+ahh ;lrr:xy,27xkne. What characteristic of the souyanx , hkr7h;rl2 +xx:nd 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 b. z)y4i/ wjb5fq mj+znote?

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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 mustu0m yl9y tq.z* 4th1gkgl/sq13*p- fpv* paa ical 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 wiw k;(jptms41nx o(/ nater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacexhbe31+h l l358x2 wiy rx)phxment 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 and the sound wave gen. 0llpki+(l6md/r dx oerated by the guitar as a result of this vip/ 0xmildl(+. od r6lkbration. 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 ends, t 3k4lt1 )oennyqc1m.jhere

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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 lengt 5jkda 9qp pz)oi/4a2a9rd f)wh L. What are the wavelengths of the three lowest tones produced by this) z9j5fpdik9/ aw4 )r pdaaq2o 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. Wh884 p,oahmjab t0iug -ich one of the following frequ,jai-880 mpuhbo atg4encies 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 itsr1g u*5r*la ll fundamental frequency. Which statement i uagl*1*lr 5rls 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 k.ox-jry)ir2a 5zl2 dzou ; .rand 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. Wu5 iwp0yo+nlgm-:pwyen * a:;hat are the wavelengths of the three lowest tones producunp5ypw-l +mi e :an0;y wgo*:ed 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 os,hjvxob .+ ckchdz1wabd-0t mv4v6i32 :3shf length L is 200 Hz. Which of the following frequencies will not resonate in that pipe4sska1vowh2ih3+dd6z b vjmhv0tb 3 x.: ,c -c?

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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 .d0dvo1s:ryyu:0e2 us sr el;frequency. Whily.de ssu:2doy0v r us1e;: r0ch 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 d 8clgd8/5 b3x 1yqgzdrriven by the same source. Each speaker produces a tone with a frequency of 200 Hz o8bc/dgx 5g1 l y8rz3qdn 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 :n+d5 kf6z3rxfmmax*;k mux-6dx 2k htwo 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 frequency is )eyz;3rkg53e:g 1+lalgnjn fjkk po.:0.q c qheard. What happens to the beat frequency if the frequency of one of the tonkggpf::gn.ka5j+yln o e0c;.rj3l 1e k)q3q zes 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 exuinsxi;eyhn/6ez2 ; 44 t.gou 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 stationary obtuav n6m4 f);cserver. The frequency heard by the obsera )64ufncvt; mver 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 frequency heard by the o4gh611vetwrojbg0zy *, g+ fui*m1pcbserveg4* +*fg0jbvc ,tu1mopge ihw1 y1r6 zr 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 hama28 f u)8pylalf-angle will decrease by a f muaa2f8 8py)lactor 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 ml2 vj7ll.0fbhgox + f3aw9 ;ckHz in air is 352 m/s. What is the air tv3 fwcl+j9lbx.g0a2; 7mh f olemperature?

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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 soun c - a5s0/y1ojs3agpxdd 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 -*a/4k wtpyxn bat emits a shriek whose echo reaches it 0.0250 s later. How far away was tnak/wy-4*xp 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 temperay.ne tmrm.. 6dture 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 n5o(um au5f)8z0fd0 gpxq):l .oytgl r 1zd*ldistance to the lightning s0*:1dyn(0or) llqfgpdl xtu8f m 5z5. zug a)otrike 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* 456 h:u/pgy4b kvdno0tbmay 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-,) 1o gdesxzzzd* a-p deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, anz)z ,g-s1op*zd-xade d 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 frequencyiw, 7 jyf 1,dqt8vxu*c 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 airv5ah7lpo fc2 k8;5 lqq 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 withf*a o v(a4b1tl 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-dB sound?ifc x5h8s-s ejuudw)2v *z4q9

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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 t aawj58,d qx3zd7 l;pqhe intensities of two sounds with intensity levels of 70 dB anjqwp3da zald; x8q75 ,d 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. What is the intensity3hr,cdz6t0(u8 x46 rq7o/ xb uhom vcr level generated m 6x 0r3c7 r4 zdv, b6txhouu(h/8qcorby 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 source that ze,78 *fhb 8 hc:wckt2sw:guris radiating equally in all di f:hwt8,cku s h*bwz7er c:2g8rections 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 equall45phyx, ctn g*y in all directions isx pyth ,g5n*4c
$6.0 \times 10^{-10} \; W/m^{2}$. 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 assumed to be uniforml:0 *6c/ q kf krt/ll le5t02buifrm)chrl+0zdy distributed in all directions. What is the intensity level aqc5+0cut bl0 tlmkh :6i 2z)f/ *rkre lf0r/dlt 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 a barking dog.+5 dxqs*n, rwo What would be the intensity level if two id*+rsq xn d5,owentical 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 qjil fdz a7dj1c690k9xw x8 p-4zl 1sla 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 source radiates equally in all di9w xpcz6xljl71l4zf 9j8s1 q-akid0drections.

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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 pointa0 kxw6: i5i ,rlra6-s iffb*b source is 95 dB. At what distance will it be 75 r05*:wi6a r fkbail,isfb6 x- 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 Hzs zn, 2m x;kmdmf)o50g. What is the freqfm;so2x)g n z 0,md5mkuency 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 harmonic of an open pipt)p768nt-jn zndv;de e is 900 Hz. What is the lengz8ndj;tt nd7-p6 v )enth 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 resonatb r;klq9h5eky(ho o80c :w fq-e in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone thalofkrc-0oqk8(5hw qe;:h 9byt 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 n 6.6 l ;rsvka*ipwm,fends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of t ,.l mr si;wa*k6v6pnfhe 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 where the temper.c3/ude( op soature 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 i s:r/o irhvu1d*pl9-in a pipe closed at one end is 330 Hz. What is the frequencu:lrs-1r / v*iipd9hoy of 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 pipexib ;j6rqu s15 closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound;us 5 1xibjq6r 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 ud( 5hw 2vpx40ug0i k g3jwj.nroom 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 temperaturjicws6 p/tpb-r(jva9j*3/z.bxm-c k e 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 vq0lw.lr 1gvn8q5l 7dm is played when the speed of sound in air is 340 m/sl8wvgl51vn .drql 7q0. What 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 length: one is open ani+qxfi-z+y x 3d the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, i-if3zxxq + y+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 fre-jk+.ksyc 4i;ue af/en1 gy:v quency of 800 Hz in air where the velocity of sound is 340 m/s. How much fart kkesj:y y/ +u anec1g.i-vf4;her 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 side by side and d p()5dad(.sfnuih6u r riven by the same frequency of 500 Hz. If the ddr5)u(pnu a ( sdf6.ihistance 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 z8zn9. nrae9 o4*b1teax t,vg444 Hz. What 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 frequency of a musical inst1lbml(ub:v 7 aein u7bhn46k/rument. If the tuner hears a beat frequency of 2 Hz, what is 1ul7:av(l6 bnhbun7eki4 /m bthe 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 sounds producerdh7latc *0o 0tfi(v )d by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns o(v0 7)c f0*tahdirltare 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 orchestr; c-jew(uxmsng;;br( a are found to produce a beat frequency of 2 Hz wheu;rebw c;xmj;(n-g (sn 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 sta*er+uv pab4.1p:p fddtionary 1000-Hz sound source at twice the speed of sound. The observer hearsv:b4fa .+d er1pppdu * 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 (normouhpht m(3-+cwcvtq c6c-j)-al frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. cvjcth op-3wt c6cq-(+u)mh -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 100y n)l;jha/8a/nw7d x.; xgem o0 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heardl/ ;wxa /dhyxo7;an8)gnm ej. 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 traveling at 35 m/s on auqif 6,; 0r.dte z:jg s)oe (uf0jxidu/(zh/l day when the speed of sound through air is 340 m/s. The ces;hu:ut difde0/uzgljf 0j6x ,z/ )(.o(rq iar 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 by avvdbt+ mu+p4wzb7ty7; c-mv. stationary observer when a train approaches with a speed of 30 m/s. Th7ym++ zp7b.vu4 dwtvtv -;mc be 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 ty vh4u 6:.eyojrain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequencyyy 4oj:.u 6hve 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 ,c1s7ghq lzd*its 400-Hz whistle. Take the speed of,l*q zg71sdh c 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 km/h. The train blows i* ixlio t7 m7,ud))mf *x+sdgyts 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?m fos* guld,*7y)x tm7i)dx+i

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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 atys/n 5s z/3z) ib2fbdway from you at 120 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 actuay5b/i)zs 2b /3zn stdfl 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 50l rry 2c9v-lb3+,j.- cwjrfwy0 Hz. Assume the speed of sound in air is 340 m/s. What is t cyc-2,b3rw9-+ vljwyrrj .l fhe 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. Assume the speed of sound in jj8rcc6(6qjc n hk6:h air is 340 m/s. What is the frequen6jcj8:r c hh k66(qnjccy heard by an observer 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 the speed of an object. A 40-kHz signal is sent our7 bochnv3jyb.pb,bi* 4 ni*6 t, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object4i*b*b6b3oij hrcnn.py ,bv 7 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 supersonigjo3l1;ct3l6gu (n;w-uhk bic 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 o;gmuxeehk*4*qd2f 33kh0af ;x 3dqjof Mach 1.4. What is the half-angle of the conical shock wave fa f;xkuqh*o4d df;*gk0hq j3x2 em3 e3ormed?

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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-k1y-no(vy wnju. i xq8c4:nm the United States to Europe with a Mach number of 1.0on i-uc4n-1xj v w :qmny8k.(y5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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