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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 stag0xkxx e/)fa(tement?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound ismrc b 8/ h0wvug2i+s 2/jk-kcs conducted 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 shg .4mvcdgh.s)c1wy6ound in a 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 velocityij +(sc*( bmft3 bjrl4 of sound? (Assume that all ojft b+*4mlj si(r3 b(cther 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, g671z qcrs j9 *wtj74hti4armci z3q(6o5so i the velocity of a 200 Hz sound through a 49 a (tzsz rwocgjs6jqom73t5 rh*i7 i6ciq14ir 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 ylulmmry ow:n.c8 jivzm l;43s- 2l2:Hz sound, the wavelength of a 200 Hz sound in ow.cnz 3ly j:i-;sm2um 8l2lv lr4ym :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 :, bue;y2v1eloqj 3 dbri.j. dthan 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 frequency less than 20*oroq5cm9y 4p 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.y+.h. s ps, i q sbkm/k82tiwph84wwk6 If you move to a point twicy s4k8pw, ikh2 kph.b6m tqi+w.8ws/se 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 diverx;nax uy5-k*s, y,pefging waves, 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 iko(f4-b6 trrbm5*z ee s I. What is the intensity at a distance 2d fe4b -ztr6 eo (brmf5*krom 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 equallt9qb/** yxh.m8hgkq t y in all directions. What happens to the intensi*km9 8*yh.gt/ ht qqxbty 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 radiating equallyitq +vpy f)f(/ in all directions. What happens to the intensity leiyv() pt q/ff+vel 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 followin xry6 kz4,(jmeg increases as 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 spsj3bj(8 ui+ah eaker emitting a pure tone. What characteristic of the sound increasesj(u h+j3ia8bs?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" omc;vu27r5 p uvf 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 not)tuirwth jbx ++g /70ce?

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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 ckjq(2ivfp /l5op/q 91 9hfg gwater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemumg;v y8ux3;m2e-gwxi d t(y4ent 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 striap 3sx4c-r() ye4r ezbhq/-ub ng and the sound wave generated by the guitar as a result of this vibration. What q)3-esh yx4ab-rcrz /bu(4pe 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 attn0k1a76ow0ciov ue- o u4 q7z 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 v-oeqe s(bf0fhsy 92dt 63we.v3tas:of the three lowest tone2svttesf:q- ds( f.e6 wh9av3eoby 30s 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 resonate in an open pipe of length L is .hfkmh m;le.g)3fm,d 200 Hz. Which one of the following frequencies will no,gmfmmk3d; h. .leh )ft 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-c43 *qupgr fkk)cxn( is resonating at its fundamental frequency. Which statekk-c3r)uqp c *4 nxfg(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 open at one end and closed at the other, *yhkvj.ra0 t/4u: a jo cr*j5qthere

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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 jfxth0 79kq/hof length L. What are the wavelengths of the three lowest tones pro0k /79q fhxhjtduced 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 h,jxj j0;/bxs200 Hz. Which of the following frequencies willsxx,jjjb;/h0 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 at one end is resonating at its fundammfxr6i9,v6hp .wwv5 eental frequency. Which 66fivxpw,mh5 wevr9 . 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 b b2kob0c.*r uly the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The0url2ko*.bc b 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 waves swa9mu5 m8mfh+hould 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 soundhf0jw b3zbg/v 18ugm;ed together and a particular beat frequency is heard. What happens to the beat ffmb801bg u g/z3 jwh;vrequency 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 exp)gbve m q6:k+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 observer. The frequency heard by the/-c r:-hdmh7mh v6pjf observer v- 6dp:-hh 7jmcmh/fris

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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 thevb+8rgv,t 2 oz observer +or gz2vv8b ,tis

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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 hamgjd 0/cnh2bt+a8x 2h7cdkx+ lf-angle will decrease by a facdh22hn+/78a0+xcgk t xmcbj d tor 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 3z - qq,* j6mxsiwq0ewis 352 m/s. What is the air temp0 qe- x j3,6*zsqwqwimerature?

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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 o l 7hiplmjin94njb )at* l*q*4f 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 sound 5v,q +xmp +twbd)9gqein air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the objepb+d+59qqwgt) ,evx m ct 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 4.0 8a6mrxz)4n s lwul:7d0 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 seeing a flash of lighqh,d s f ;g;2zm2,iyvltning, the distance to the lightning stg;idyl h,f;m,2vs2 zq rike 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 lme no fqv8 2mh-7 4zi5n1h3yja 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 spk)x02v 5czb lflash 2.5 s later. How deep is the b 2kc5 xfzl)v0well? (Ignore 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 +wcnlcy*lx::b . 0 cata sound wave 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 atn-p*t0bjn i/ n $23 \; ^{\circ}C$ 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 intensi+ eakgdjp 23s *ea4a4ity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensit rp 10 x6nw j9wbe5qeoe22)c-cpxsx7ey of a 70-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 of 7 fad-s28ny*zkpzgl0;b9 )cb v0 dB and 40 dbk9gpcvn8 sa z d-*y0);fbzl2B?

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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 engi-w+pfma7m*d 8zruwdsq.f + ( rgb3bh 3nes in a garage is 100 dB. What is the intensity level generated b7 +*hsmp. +(a8zqbdfwr3u3-fdbgmrwy 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 ogsb5 (.3who1b6 - lzzepset9d2o3 ys6.0 m from a source that is radiating equally in allbz glosp 25ty z-9e1.ds wh3bo(e3os6 directions 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 radiati5, fi a-ku4y p73jfem2* atouzng equally in all directi2t- u a ok ipf4a7,ze5ujy3f*mons 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 jqf2 /f3ybt:3xhhzfvd 5z/:khich is assumed to be uniformly distributed in all directions. What is the intensity le:fb3/ zkd2yh:xtq z hff3/vj5vel 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 a barking c; sgz9 gkj6ye8 /9ssqhx)mw1 dog. What would be the j9)kg6 /q 9s1gmze8 syshw;cx intensity 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 intensity level is m* zhccf; q *zo,.kz7e60 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 ,7oemcc.z; q*h*zkf z 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 g8)ey1l; z dzrj:tc (la point source is 95 dB. At what distance wiy j )tzldc1z g(l:r8e;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 m bs; qzt .uxgw.tzyo73*p13 zcomplex tone has a frequency of 1200 Hz. What is the frequency of the fourth harmoniz ;xgoy3* tsz b7w tq..u31pzmc?

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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 Hz. What is the le-a4aosfc *j d1*r.ynz ng *1 fcdj.-ornas4* yzath 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 400 Hz. What tyo4i+h0esr3e b5; byis the frequency of the lowh4t 0eyos3 rby5i+e;b est 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 lz.e vkj0ipr.6yxfy/k 9rra5 kf9 y ,+cength of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the cr fryy 9 ,k.0p z5f96xrkk/ie+j.ayv 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 wwik:v1vvo;(h here 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 at one end is 330wwfn ;4; f rrghh85nw4 Hz. What is the frequwhwr4 wn4;85;frhn gfency 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 pipe closed on one end that will have a fundo3m07w;v*jofy;kbpl 53dlegutm w.6amental frequency of u3b6lt3jo ; epoyv g*w m50kml;d f7.w60 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 an9* 1iskon u5-m-rrz g33yjia room 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 tem9xya ,9y,tzjo perature 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 pk m7 6svewdq7p9i9 7cvlayed when the speed of sound in air is 340 m/s. What is the fundamental frequec qvkms997ed7 v7pw6incy?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes o(cd3 2sskia*z f the same length: one is open and the other is closed on one end. If the fundamental frequency of tsizcadk( 2*3s he 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 ea,vy0 m7ik(y1*m..sd;0tnt ichmrklnch emit 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 moved so an observer in front of the sources would hear mc,tkh.7t*0( .mnrvslm i 1ki0 ;yydnno 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 sa*c uwbim(4vu *o8c zi,p+tqk(me frequency of 500 Hz. If the distance 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 personuzut m**cbii v4c 8o(wq,( p+k 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.2ilbc y.5i-d7nyzj0oj)5c j q 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 9+ o( -iubmtohg7i24zqcsxz c n,r .q4550-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat fzz c ( 9no,q. x4tchuo74mqgs+bi- i2rrequency 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 soukciq;s9w f)u,. v ri7pnds 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 velocity ofu,s7; c rf)ikq9ipw.v 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 -dx/nehn 8aq/i7cjx 5 ++xqu;binu0jfound to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage chj0h7+deux8qn 5 cj;n x/axub/qi- n+iange 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-Hbnj7c j)l8q2 ld00q dzz sound source at twice the speed of sound. Tjl0 b7l0q 8dqzncjd 2)he 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 frequer7 9zrm52g3lnxandq r,b x5d( ncy of 1000 Hz) approaches a stationary observer at one-half the speen7,mxrzqlrx(5r 3 9nd5 2bdagd 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 movel:ec a)4q 1 fr)yume 5ibcfs*-s with a speed of 30 m/s away from54)ce c: qbs uferal*-1yfi m) the source, what is the frequency heard 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 a9 vkcov,gc adc j994c; day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing aloovkg9cc v4a;cdj9 9c ,ng 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 observer when a train appr1oewa 56esb1sptd3v:d+r - *qqjr 6ei oaches with a speed of 30 m/s. The frequency of the 1v5wtpq jq-dbe is 66 aers+e rdo*:13train 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/h5+ d,gtlzyyl625k5* gfxejv20 s tx qs. The train blows its 400-Hz whistle. Take the spe*d2zf lytx ys5lg+kq5v s gxet02,5j6ed 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 e25arl dqjs;2a0i;uf train blows its 400-Hz whistle. Take the speed of sound iueja2sl;qd; fr5a20 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 its 40 /w9pr byw*a ,ql*y;cw0-Hz whistle. Take the speed of sound to be 34yrqw*a ycpl,*b 9 w;/w0 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/hf xk6mnvo c*3bqe*t 2*tm6o0z . 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 the whi*b*v2tn3fm6 mz6o0 e ctq k*oxstle?

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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. Assos42;v / x bi3diufse)1eja/ yume the speed of sound in air is 340 m/s. What is the frequency heard by an obs df1eeu v sxjas4i)2/b/i3 yo;erver 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 soum2f l-xi.-xkind in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the tra -lix-.xif2mkin 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 exp ayn r:;vj,u6n :.ysent out, and a 42-kHz signal is returned. Assume the speed of sound is 345a:;6x n.yn,ej: y uvrp 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 supeh hq c8;q83h)pnwl7twrsonic 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 the conical szd cz0j45beo ;hock wave for;z 0j4odce b5zmed?

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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 m:)p088i vq5 qw)otmxbyx(y5acq *r n States to Europe with a Mach number of 1.0qcyit)( w*)p8r0qx b qvm5oy5 8mxn:a5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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