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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 fals vtvrr0y)( -kbe 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 thoyo/ 2cp h;oxd vx.n18rough

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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 si rk/ufa6azc(pd) 1-pound 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 velocity of si8/uio6/gch :dwjf4 2fgoh w*ound? (Assume that all othgw g4ic iof*f/2d/h8u :6jw oher 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 Hx 4j0 wrhnd q+va:t)b(z sound, the velocity of a 200 Hz sound through(4w bn0:txj+r) vhaq d 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 of a 40),r b:pbtx3y o0 Hz sound, the wavelength of a 200 Hz sound inbyor)p:, xb t3 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 frequencieg8kj7 qis)ro+s greater than 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 frequnjwj/9dt)ja xu 3pfi .c/l/p -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 directybq+w xa 0z.5kg;amm7ions. If you move to a point tb q7x+z5.0amagm y;wkwice 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 proportionalbkckcmyj yg-u(2o.o(qu + .2g 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 saam 6)6l3*3smxob qcgource at a distance d from the source is I. What is the intensity at a distance 2d from the sgs336*)o6aqaxlc m bmource?

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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 souja n1 :b*r5fwlrce that is radiating equally in all directions. What happens to the intensity of the sound?bj 1:rl*a nf5w 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 syg/hr.l( a6 z il6m.bbound source that is radiating equally in all directions. What happens to the intensity(/ma6 .zlgyilbbh r 6. 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 sound bzn5v11gv0lgufou/ l r12-d +vvl j/ymecomes 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 emittingxh/x0 e9in(7; 3osocrkxxs q9 a pure tone. What characteristic of the sound increaseshx0i 9en cx7qk/o;xxros3(s 9?

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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 musicw3 ob- *l- kck0ask-czal 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;4ld roo7lz)7vx; vude?

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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 i s 5:xrbf;)luv4nd/ucnto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement w7 ci3 kr.mnag:tebk- ;aves 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 v/ nb)o be7umj6jgtlaja8/m/2ny,u, guitar string and the sound wave generated by the guitar as a result of this vibration. What domjn l)yv/ jbbjte2 o,gn8,mu/aa/u67 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 z it9nt5ue5o1 q;3y.kkhho+t 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 xx w3 4v1;owqj,8jrsgi +0gliof length L. What are the wavelengths of the three lowest tones produced by this+j4vi3r0jxs g8xw gi ;lwq, o1 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 p:q, bkjmb 30y im/xi kwp8,s2200 Hz. Which one of the following frequencies0ipsjx3 8,y b wqk,m:ki2pb/ m 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 rec,oxkf ,zt9l;sonating at its fundamental frequency. Which statement is corrlzct, kf,;9o xect?

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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 an8i sk:w)v jg0zd 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 thoktl0n v xsu0i55o z).ree lowest tones produced by th5u i.ks0ont0voxl5)zis 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 lengthg x*3uk8 xv,o 8jetv5r L is 200 Hz. Which of the following frequencies will not resonate inx3roj* 88gev5tvu, kx 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 clo .nxt4y 70mfdzp )+fzzroc(1r sed at one end is resonating at its fundamental frequency. Which stancz+ )rf(.o 0yz4zm7xt p r1dftement 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 bxfh)g2gf mmw1*08p bay the same source. Each speaker produces a tone with a frequency of 200 Hz on a fb*2 wxmp1h0fg) a8gmday 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 be:30 1dn- (th xugfioqbats, the 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 toga)a 3qc5 iti1jt4ncs6ether and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of tht 31ct)4q5ca sijn6ai e 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 explail.zkyzt40jd 9 3ewy* vns

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approac. dc)n( 2g*lslgm zvc7hes a stationary observer. The frequency heard by the observer i d)m7l sg2nlvgc.(*zcs

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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 oyp )8 d.(s7p2iox awoubserver. The frequency heard by the observe2dupo)yaw8.p os7( i xr 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 hal*kc o1 w,r(bo t/wfgz2f-angle will decrease by a fb1t,f gk w(ow2 cro/z*actor 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 .th/ dq-4mvky5 ge7d, i n3gekm/s. What is the air temperk4h- et ge.dmq7vgy,3 dn/i 5kature?

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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 t*,c*bnsa;c lmhe speed 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 sound in air is 340 m/s,,q .el7l09ohh cpc4m b a bat emits a shriek whose echolp q0c hcb,h9 m74l.eo reaches it 0.0250 s later. 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. The temperatu+js++ )*bk(d1 .(r ww cjkkk4hbpl azdre 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 distance5e2by.xx7+ eu ,cjfa9fpc ;8*sz nsjf to the lightning strike ensf;ebc zf9px u725,y8.xf j jcas+* 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 temp2f2dq p -6md*2oz3/lh ow eprmerature 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 iw, raibg1tz9exh623*g j8v lthe splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocit6gl1xi* 93,h bi8 2zwgjetrva y 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 o dr8vtg: j1t8 qdq)qqt:9k:muf 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 at 8c i4a6ldsi 0e$23 \; ^{\circ}C$ 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 o9. gw*qb vziuotu osxr,r1-32f 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-dB sou4s+jdgrl 9g1snd?

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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 3kc0m0 gspnl8sounds with intensity levels of 70 dB and 40ngcpm0sk l80 3 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 intensitywvskgn i9io9)uh5xrq; e3.9 s level generated by one enr o)hsv9 39e.;ugwnx5s9i qikgine?

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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 dis6bkqcpgwl9 n )) q)mubs52 v:htance of 6.0 m from a source that is radiating equally in all directions )lhcuqnb 2 6gsv m9:q)k5)pbw 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 equally xbf/ (w2*/duyvx n*ve 74bm tgin all di2udbx (gby vtn ew7*m4* v/xf/rections 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 a6mz-db 8ab1ufx-mj)g bout 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from) ax81 b6f-bmd -jzugm 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 dooj a6twoyz3kejwg k/- 4,9k 8zg. What would be the intensity level if two identical zak 648o3kgw/y,-tej oz k jw9dogs 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 intensit07 8qlb.f elfmy level is 60 dB. What is the intensity fm8.0blfqel7 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 a point so y8 crja 5uh br+zb6zxfv2w7-*hd,qx6 urce is 95 dB. At what distance will it be vhb yrh,jbuzrcfxa zd 6-wx657q *82+ 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 is thpnb *wa)0(bxe mzntugm6 )9 2le fr2*(m bz ban6)0 pel9mutwx)n gequency 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 thidmj) qzr63 px3rd harmonic of an open pipe is 900 Hz. What is the length xj6z 3rdmq3p)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 is t7ztxc uy i1t8+he frequency of the lowest tone that will resonate in an open pipe of leu8y+ictt 71xzngth 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 botk4utd6z x bjv5 i+a5cn xdc:*)h ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, whatckzc6 v+dxjdtibn4*5 a u:)5x is the frequency 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 whered;l3t(ji-zshdejgdu: k : /.q 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 o- ,lv3 fwqo zmr5m:fe,ne end is 330 Hz. What is the frequency of 3oelz-5rf vwmm,fq: , 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 6v)g7v8bb1 smw 3 tnscj8ncqzh 8 8d8eend that will have a fundamental frequency of 60 Hz on a day when the velocit8vs1hv6cq 3g8sz8)b8m tc8 jn bwd7eny 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 temperam r9(ogsfrsszpp7,o2/ z:/kyture 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 temperatu-1/ upyhnu .,pu,sr *5qlolft re 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 thee+qx 3)y)hxvf .n ,zsp speed of sound in air is 340 m/s. What is the fundamental fres. hn3+x)f z) ,qexvpyquency?

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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 ld k(j1* z8 1(5pylk;iims ehnon one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed pihj il5 8d m*ylk;s1e(k (inz1ppe?

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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 frequency of 800 Hz in air w) 3n*ly;lj i9stmji:z47pnr ihere the velocity of sound is 340 m/s. How much farther back would sour:inlsm9 lz ; ri*j4)pit7n3j yce 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 driven by the same frequency oku. l9z /awo+ zh79w).qaorpof 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 person to the othe.lwo+9pz. k/9hq u7a w) ozaorr 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 c9euba7xfmm5k,9v .u 440 Hz and 444 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 t qbgz8p 09mszid;c.df-v r 19lhe frequency of a musical instrument. If the tuner hears a bz.spmq f1;0r9z9vg8 dli-dcbeat frequency 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 sounds produced by twtde .4zvy m:bv9/lq:vzka2, mo horns are 6 m and 7 m respectivelyl4aze v/ykm2m,vz9vbd t:q .:. What beat frequency 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 ani(qg5 su5f *pan- e,y fzqd:,o orchestra are found to produce a beat fre s,*g oa 5z,f:5p(ydqe-qif unquency 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 gbw wpj1jx n 6cij 3l;vpa9 g4p30.qn2a stationary 1000-Hz sound source at twice the speed of sound. The observer hears a fre3p2wb;x 4pa 1 jpjg3wlj.in 0cq69gnvquency 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 s-l.x,: m(qls, tlwoi stationary observer at one-half the speed of s(xm i,wtlll-q: s,s. oound. 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 H9aq;zzxffbe 1; v l.4sz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (Thslav;1.x b z4qf z9f;ee 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 a da h,omr-ykdt qu;:3-aqrd gi3al:4am-y when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequ3;hqrm -tr: m :3ld4quoik-a, d yaa-gency 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 ocofq; xcy/x4026 2:jfxuak ddbserver when a train approaches with a speed of 30 m/s. The frequency of the train :2adqdk fx fj 04c2 ox/yx;cu6horn 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 train blows its 400-Hz wr -z t w*xsxq2;(mdo9ka+x ;xkmvz s:0histle. omtsd;xvq-zzw+(s0km2; :9x x axrk*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. Thez, p:dk ou)0v):ty *xaqqnx7q)s cdf 9 train blows its 400-Hz)zu)9a :,nskfcqoyx t )q0:7x ddpq v* whistle. Take the speed of 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 away6fs+b (gqg q2n from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sounbsqngf+62(g q d 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 whis mx stf/m /g9xi+rn+ohd:i8s.tle, 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 w +hn9/.to: ximrf migs/d8+ sxhistle?

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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 in air is9 it dkf5ns76h 340 m/s. What is the frd t5n79khi s6fequency 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 air is 3lnv;f :vsv5a-40 m/s. What is the frequency hn;lavv s5 :vf-eard 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. utte3q7-x k:f A 40-kHz signal is sent out, and a 42-kHz sixq-t eu t:37fkgnal 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 thrsb-nl6* j qc(e x-+gbe conical shock 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.eh +0spru0sx2ybr *, z4. What is the half-angle of the conical shock wa0 +ybr 0 *pz2u,xrssheve 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 States to Europe with a Mach numbero6shis.w6ycz/k jib7-p.;+zg b5 dc(fv wqm- of 1.05 whc zfp+bm .yzwjg-q i-hck. 66ob5;(s7i v/d wsere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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