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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 statement0 t;vx n6bfvnu96.xsu?

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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 3e 2 /eqjhi*0yrlmm(zqqz + u(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 steel rc8:g raa1/s jxta *;gcod?

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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 atd*qv cs-s7*s7 s0dko ir increases, what happens to the velocity of sound? (A-77qssvd*0 kdsc *sotssume that all other 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 sbh) u:uurcdl3pgq/ 9 (ound, the velocity of a 200 Hz sound throu rc(ubg9 p)hl/qu:3d ugh 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 7i3rhw3vny j).8 d dugof a 400 Hz sound, the wavelength of a 200 Hz sound in air .73hi j du yvn3r8)gdwis

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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 c7j*pfe1zx 7r palled

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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 are calle,eph*zmp 2ab6x 60.etjb l:ged

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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 ; fkq5ah2e6 a:v:klodall directions. If you move to a point twice as far away from the source, the frequency of the sound will:la 6 oq;2 5dh:kakefv 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 proportional totio6 o9jg,gh uaa 4z,,

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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 fro 3pnrs)x.sy1 2z5hq0p5b z9lp yzwc 1im the source is I. What is the intensity2z wpl 3yh1rxn05c s 9)qpps1zzi .b5y 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 ifdsvgnd(/9d c 0e8a brx*u*4un all directions. What happens to the intensity of the sound? It reduc8 f*0vs badrguudn (cx/e*9d4es 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 equalr z1m 24 gu1rsx)y*i flz9qg4dly in all directions. What happens to the intensity level of the sound? It dr1g2xfrmrq4y9z 4zsd )i l*ug 1ops 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 increas:e/ te sc;wwn/es 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 speaker emitting a pure tone. What characterist hdz-7xppr t dgbo9230ic of thet07oxpddbzpg 2hr- 93 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 no-mf*kmuc 6nu+ 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" 2e.p53uynzh +o6n/aol (q 2lpcawa2kof 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 iny nor4.y f4n4g f6f(jkto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaceme3vnwn9ji+wkz0dvlxn5 9 y;t7 nt 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 thendhanmw// op/ r/.eo1 sound wave generated by the guitar as a result of this v/wa/ mhd1r nen./op/ oibration. 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 endsqg :sk//zuualcw9t 45 , 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 lgv-t q:j7a(zof length L. What are the wavelengths of the three lowest tonet(:l jq7v -gzas 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 200 Hz. b,t7 i cxa:3akWhich one of the following frequencies will not resonate in xt7ai,k3:a bcthe 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. srxq5y5id2+s3f *e )p nz qx8q Which statemen rq3xx 8qpfz)iy sesq*d2n55+ t 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 enno x)k0qxn+4t3b ta, xd 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. What are the wavelengths of the three lo4r7w60 qdz uz ae;0gvjwest tones produced by0gw ujde670v4q z ;raz 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. Whiievc sgl 3gvehgk6+9mg3t u0iq 9 (9:dch of the fo ci3tgd9:ig9 u vq0eh +g3mg(evs69klllowing frequencies will 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 fundamental freque1lly1 c/l 04 gfuiorfe1yz/j5*xj dn4ncy. Which statement is corc// uj05ldi jryy 11fe*lf4 zxo41gnl rect?

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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 same source. Each speak0 wdl1 : xtv0eg3c: yiqyx.v7oer produces a tone with a frequency of 2 oy xt0l7yqwxc:g . :dv0i1ev300 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, tougmwci9uewy5a.j- , a a7 5 tn18k.pzhe two 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 part2-lwmd2xyk9( i 2 7xdez.khz vicular beat frequency is heard. What happens to the beat z2xhdmyk w.-dz(eiv2 k9lx27frequency 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 explain7bqcwoe +;g 9lj3hk0x0s 7pwis

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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 frequenc (; )iwoyv1criy+ g+fcy heard by the observerri+c vf g);+icy (yow1 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 stationaryzp ou65ei ui3e v353ap observer. The frequency heard by the observe3p6ee5zo pi 3i3a5uv ur 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 awv ;tsjn )88aMACH-speed, its half-angle will decrease by a factor os) awva8j n8t;f:

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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 ik l 7h66eialf1n air is 352 m/s. What is the i6hf17e6 la lkair 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 4 krp5.eb0mb dc.s)w vsound 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 wte7db-j7c +y- d-mzyghose echo reaches it 0.0250 s later. z ydy7b+ dem-t--c 7jg How 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 4.00 s eb 6myw rn5sgt4r t9f4 +hqhxc(f113c. 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 seeu 0z 5h,vnokt6;mrn;qing a flash of lightning, the distance to the lightning ;uvo0ht;zmrkn, qn56 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 tem cn2ehi9wd.ncf7psws o.2 9 id-q1ez4perature 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 andz;rcj.c ihhibv*(zb md82h(9 hear the splash 2.5 s later. How deep is the well? (Ignore air resisj cr*2z;(hzmiic hh9 (8bvbd.tance, 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 ofqr.:/6* aa6ny bp0 ar dhjpi(c 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 a)lfth+v( v5ctr9 a2ant $23 \; ^{\circ}C$ 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 ofg 2f0+mqb; ta(h ,mn+de s.jjf 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 70-vlbhjzypq (;xvo uv9(e, 0 4s1dB 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 lu;wzcbzj5ufx/ s9;9 kj. u f+aevels of 70 dB and 40 z5u+sj;cz9uk/;w f.aub9fxjdB?

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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.tgg1lfnlxf/xg.1j3 ( What is the intensity level generated by one engine1tjg(g ffxgxl 3ln/. 1?

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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 ,hqp:id6g s17ggy16kh cm8d m6.0 m from a source that is radiating equally in all dirqd,h8sgm mc ykg6gd6hi:p 711ections 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 radiatin)/2xwia8s uv lch;-c gg equally in all directi-ix c;/u)l2 acsghv8w ons 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 9*rpxdsx2 k/l6p9vs 3iu 5 szzis assumed to be uniformly distributed in all directions. What is the intensity level zp*9s/5uds 3p kxsv6ir 9 xl2zat 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. Whsg e x2:s+e3lnat would be the intensity level if two ident 2g:nees lx3s+ical 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 s;b (7 cjx9dwkem 7z-emource the intensity level is 60 dB. What is the intensity level (in dB) at a point e7 c7xwm9z;md(k-bj e 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 a point source is 95 dB. At what distan5n e t4b.7kcehce wi 74netb.e5khcll 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 ir w f;,4,:3mfqqmdugmu 7(gdts the freque;u ,,ut3mff mr:4gdmgd7qq(wncy 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 pipe is 900 Hz. What issgbdpvdhp f ;:-: 9e)gb;tu+v the length of thhbd9bpptd g+v:; fseug-; v):e 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 resonatxffz1zwhj+xdz 2(o9 7 e in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone thaj(d9w7xxzffz+12z h ot 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. If the velocityu g s/ovpa1o7l6b :1pabb ;k6q of sound in air is 340 m/s, what is the freque;buvsaq6lp/116pab7 ob:kog ncy of the 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 of(;1omk bx u)fpzd)kyn 0+f1m66c gmthe 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 330 Hz. Whivj7lz2il 90yv2rupy d wm3;2 at is the frequrdij3vi9 2y2mu 7 p0 wvzlly;2ency 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 shortestbv ;9+8tm7i s0 swuskb pipe closed on one end that will have a fundamentsub+m v wki; b8t0s9s7al frequency of 60 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 room where the te7oy t+dd9owxw *4tp)jmperature 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 wh*lppuez*35h.w m, q 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 when the speed of soq/ l/(f b9q5a wuwm5enund in air is 340 m/s. What is the fundamental fr9 w5u wnqbq/ am(5elf/equency?

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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 closed on ll(6b y rayot- e*/z,eone end. If the fundamental frequency of the open pipe is 300 Hz, what i6(-l lyy eo/eb*r,ztas 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 em,60l4k 1)ckqz dwqid5, rnvot it a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back o0iqltn z1 rk6w) cddvq4k ,,5would 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 sw9ef3eo6b3y o ide by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5w96o eeb3fy3 o.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 tpd :bvce0j55khe 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 sn9c5k0gt 3 xe550-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instru0k3 gt95 censxment?

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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 p(4(jbtkv2*i bib4d 9xzb;ufmroduced by two horns are 6 m and 7 m respectively. What beat frequevfx( diib*b4u4 t 9(mj;z bkb2ncy 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 i t+,:wg4l t7r(r0(as/ v hpbmplbupg3n an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in 7 ta0rg3:/ pbt(4h(wgruls+bp mlp,vthe 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 :9 5 zvqs6ashcd4 gf/hsource at twice the speed of sound. The observer hear shvah dz5/fqgs4 c:69s 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 frg fs: s,ae-h b/+mbwill7 vx.(equency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observe(lsb:fg-+,/wxb 7. lmiav sh er 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. I(h7y (+/.epibsa8cgnv yabu: f a listener moves with a speed of 30 m/s away from the source, what is the frequency savu (+naybbhye (8/i.p 7:g cheard 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. 7h;xlvmau)k-+ uk0 pkz23phw It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s.+3 k7a ) hkpwx-pl0kv u2umh;z 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 by a sn(x* n*kzv bn (0dn-tgtationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 6n-z(0gxv n* dtbknn* (00 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 towolfk9hss+u /zxm0 d(iz6z/:rard you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.klu/sfm 69+sxz(z0 r ho zid:/ 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 4ut0 (i. gm:e;;fdyabf 71k+ jglj2 wfzjmb1ntrain blows its 400-Hz whistle. Take the speed of sound to beyjj uif(.1fl na b2 b+jmt4; efkwd:mzg 10g7; 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 40r0 *byzbts6 h2-g*ny m0-Hz whistle. Take the speed of b - 206btygryzm**snh sound to be 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 blows its whistle, an9oe 0f)il3wmt d you hear a tone ol90)w3 fote imf 400 Hz. Take the speed of sound 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 s 5mt(mfg8zo/vound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a spz8m/mo( tf5 vgeed 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 inob /4ajy9*y nn air is 340 m/s. What is the freyn 4n9jo/by*a quency 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,sk :) ihe6xuo is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is e: ksxo,)hui6 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 supersonic aircraft 8(/5-yjr/b ng h6oepvkfl)v q 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 cobcqr cbv /n/ (dz nd:n+m7x p6 xzrdq*218u6oqnical shock wapd/qmd *vb(d/2 +xqx86 zr7 nqn 1or6uzbnc:cve 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 ndvf lzde(en*k9 ev6e 5s*.464xy xvethe United States to Europe with a Mach number of 1.05 where the air fn96*xv5ee6n. 4xelv4 dvk* ( sd ezeytemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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