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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 8j,6a/ *l1f s0b;vylhgqwlc oa 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 conduet7:cyo )amh1z-fx h/ cted 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 sounf.cy 6(lpe:+naosh7f)f 8f h8ivt(q ybfzm00d 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 infile ;7o8urm/ creases, what happens to the velocity of sound? (Assume thae; mro8if7ul/t 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 sou 6kd k-/bc9l qpdlp+g.nd, the velocity of a 200 Hz sound through aikb pdq+p/kl.ld 9g6 -cr 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 Hz sound, the wavelength of /lwb8 *b ymw0aqt(:w iru67kd a 200 Hz sound in ail*kabrqd7:8(w y/u0t 6 wwimbr 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 gr j2m+.r vm3(hikb j1qyeater 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 frequency fe: wa2j;+ppwless 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. eeei ay/8g-g-6 x ojdm11m. hq If you move to a point twice as far away from the source, the frequency of th/e1xejgme d.qy a-h1-8io6gme 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 divergixauxqg1 a8z r1a +:b9y1 1bzfing 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 th ugbh 5ftj *t0op+ah:s.8(qcxz7 os0he source is I. What is the intensity at a distance 2d from the sours: aog .u7bzhc0j t+psh5f0 txh*8o(q ce?

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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 i qcsok9(4 a.kon all directions. What happens to the intensity of theqo a.ockk4s9 ( 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 c00 f c6( l-jingdytc-that is radiating equally in all directions. What happens to the intensity level of the sound? It dropj--cditgln00 ( ycf 6cs 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 apb 3ff:zwqxz15p 8( ib 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: or8bj3; qvp *iqin3z hfaiu1ga 97b4 speaker emitting a pure tone. What characteristic of the sound increaseab 8 ri1h:gnfz9jii3o;p *aqqvb3 47us?

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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 note?kk)hd)u9s w rbqxd1: 3

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pit7yt oa tt)(p8xch" of 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 wa/jgtp*s *t98p j,wuu lter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaceqq mxxa (b::(mment 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()5uh g hax k8 ;pjtku;ft4x0u guitar string and the sound wave generated by the guitar as a r u0;gakh(84jp; hfkxtt5) uxu esult of this vibration. 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, thpfz8krv in) .9ere

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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 k,1v2q 2b npzkthe wavelengths of the three lowest tones produced by this pi 2pnvkqk21 zb,pe?

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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.5wt7 i qrz; f8uj *+nw2;wk3wyj15i*apx zhki Which one of the following frequencies will not resonate ink; 8z z+*w5tpn1h iy7 ji*iwwwf;ukr3qj5x2a 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 it) c4.sfqda:qb s fundamental frequency. Which stat4 )cbs.dq qa:fement 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 opyv , : djiioem(s()yw1en 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. What r:evp;q8uz:xare the wavelengths of the three lowest tones produced ;qe 8:px zrvu: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 of th.bu1q8 jnz2o0*tb;j q7sy (1bljkhmve follow jykt12 1h*jom vn b0bq;sj ulz(q7b.8ing 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 closr f7-z*;sf(j ied- uw,l :/wk sdag)vsed at one end is resonating at its fundamental frequency. Wsfwi;ar*: vug s/sk( )-7j-dzelwf,dhich 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 by the same source. d8spovu5ff;3 0; 3 +vfcpdohe Each speaker produces a tone with a frequency of 200 3 0d;edofhpo5 f8+spcu3;fvvHz 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,8/bl bj)e) wdi4is.o v 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 together and a particular beat frequency is heo++p6v 9rzbenp .rhgnj *of42 ard. What happens to the beat fr*e4jpv 2ognb+ 9r6.nr +zpohf equency 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 explazbq;- nez kc9.ins

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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.wrg8 tq)8b0 gn The frequency heard by the observeb0 )n88ggtwq rr 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 heard9j/ f9 dzs3 ,lyy9e1:hb;.jrusan dlb by the observll9f9, j:hyr19b3dy sn;juda /b.zse er 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 i/+47pmiicx9co adcp9ts MACH-speed, its half-angle will decrease by a factop p+ccimaoxi74c9/ d9r 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 ultras-4n n0ym7ydn* i1c s4zn z+slnonic sound of frequency 45 kHz in air is 352 m/s. What is the an+ dcn1*47zn s4sn-0mzilyn yir 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 theurku(v +x;.uj 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 16p 6apyj kqj3in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that1 jpa636jkypq 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 3vvx i5l0tn*djgy jd:jyu 4 t,fe68 2vhear the echo in 4.00 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 y.9fe(,r; w,omhsv zq after seeing a flash of lightning, the distance to the lightning strikeqy;.(hw ,of zv9m,sre 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 2.00y ro8ea(:n2j:ztkdqd4rc ( y s from a 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 intov gt8bl:gp *7v0 *fa3mre aj9w a deep well and hear the splash 2.5 s later. How deep is the0gb8* 3gj97p :tmevwar*a fl v well? (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 a sound wave top0ukdgtr.+/q7zbnv9n87c 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 at4s 8g8oxs6irm $23 \; ^{\circ}C$ 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 intplukwl4*2 0i tensity $10^{-3} \; W/m^{2}$?

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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 sou lk aci;:96t3x s/hdlxnd?

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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 o sjx55thm4us3)c f/zf- oeuk 4f two sounds with intensity levels of 70 dB and 40 )4js/ zk4e fs m55-x3utcfohudB?

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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 i fpfnoxm0y+pn( b:tunus6d;:g(d -3dB. What is the intensity level gener:x3psnniogp:-ym (f;dd0u (nftu +b 6ated 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 dist7 jd(+ 3bazd w54kr 4ksqnwr.bance of 6.0 m from a source that is radiating equally in all dir3d+ (75 . nb4kzasbdk jqww4rrections 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 soura t/l3 +xsilf7bt(u- sce that is radiating equally in alt xf alu3(s/t+ bsl7i-l 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 ps)+jtjo17ahkc az :)hy z3 ,mxower, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distazy ,sj7a) +)zocm1j kthh3ax: nce 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 5.00zxbj afy0t fsk,e)i/r, ), zs, m from a barking dog. What would s/ a ,ixst)), zr0,jfyzf ekb,be the 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 60 +ubxju5avs 8. dB. What is the intensity level ubuxvj 5.8sa+(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 s4mta-i w(0 uvkource is 95 dB. At what distance wii0 m- k(ua4vwtll 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 freqs82knt4e 9cbs:d wbsgr/ 2d g:uency of 1200 Hz. What is the frequency of the fou 9dbsssb w:2 n/8ctkeg4 :dg2rrth 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. Whads jyrmha,ym/*qh/5 osq, e0/ t is the length,// 5/dsojmsq*mq0hhyy,e ra 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 40 h)7 q em .y5hndxz-9*t6s; qmty7hhsj0 Hz. What is the frequency of the lowest tone th6 y9; *qj7dq.yh-t)xs57m t hzhn ehmsat 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 velocity of 9 w1.njye5 zmsyen9gpre3:3 f2cds z,sound in air is 340 m/s, what is the frequency of the secondyrnze1 wj,sp sfg3 5y n:e99.3cz2med 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 temperatu lw9za916z0yoemcb4 sre 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. W(dbeb rzz*g6+ hat is the frequency of th6dg( eb+zr* bze 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 thep 1nb reetcc9) 3dw4o4 shortest pipe closed on one end that will have a fundamental f3c)e9rp1 tc4nbe4 do wrequency 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 ing1 n.v)a/w kp njoj;;g a 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 tj :7x3 abwue.yemperature 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 sound in (fe ;6gdr7zznq jh4e8air is 340 m/s. Wrzeqgz4 ed86(fn hj 7;hat 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: o: 7 fb)zcp,ttgne is open and the other is closed on one end. :b),tfz7 ptcg If the fundamental 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 emit a frequency of 800 Hz in airk8/2u s 5n3s1 ,cum/xl w hv,/h8qnrqd zvhzt: where the velocity of sound is 340 m/s. Hor h8q x/uz5c,vnshkszw8 l3tmd/ vq,h u/ 2:n1w 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 side by side and driven by the same fre9p-j)4.y zd0+gog,qys utb bsquency 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 person to the other speaker? (p 9b u+4dgs ,yz gtbojq0s-.y)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 Hzd:y. fu-p nwkt,5* ucv0a61qx o ksgsra. g0h6 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 the44go2znc qjy8 frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrcnjy4 82gz 4oqument?

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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 nm) nl1c2hkl((2tih k8 oio:oby 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 of sound is 340 m/lmc2o n (hit(2: oin8olk)hk 1s?

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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 violh e u(a9gb+qvgd,c8l3ins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in tc q98g, u3e+da(gvlhb he 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 tww(ty:n ),) qojsq;k 39sc)l 5dxmvxrcice the speed of sound. The observer hears a frequency qsclscow ;kxv)y5t d )(xm qrnj:)3,9of

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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 obser,zhh) +v5iou1ch 8 xykver at one-half8x)z,ho 5ci+v1y uhk h 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. If a listener moves wit4v z2v0q*w kewh a speed of 30 m/s away from 4 vzvw 2q0ew*kthe 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 a day wheb i(6 (un9hq7hq(xtxuw ohv5.b) p t3pn 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 frequency does the obseru67 w.v9(h(x (on)qhp3hb qtu 5ixptb ver 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 approaches wit2ze7t .: lju+zz pvbx)z5l0vqh a speed of 30 m/s. The frequency of the train horn is 600 Hz aue:72z)ql0+x5vtb . jzlpvz z nd 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 2c:4i bleszu:e/g* w)ej bj.mu0mkq ;its 400-Hz whistle. Take the speed02bk/ui)q me*e mzw besl;j:jg4uc . : 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 tr eq.e+h xkj/9gain. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whj+qg 9x/he e.kat 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 aw/*tfvi )ec2tkay from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound tf/e)2tcv ikt* o 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, and you/thb .ozb z (:8bb0fit hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the :(bbif hz08/bbt o tz.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 xa2) dth j6i.v,/ gvgu500 Hz. Assume the speed of sound in air is 340 m/s. What is the freqau/vg6d,v hg2 x .t)ijuency 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 jdpoc:0/r zh +is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train wih: jpcz+ 0rod/th 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 sefy;pc(us4xpn z ;x(n3iidirt6k0;5 a nt out, and a 42-kHz signal is6a0ixnz3pf sy(ckpndii ; t;(5 x;4ru 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 supersoni( pb fk38;x 2)bddvroac 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 1.4lt3znp* xgu; s0p/p* d. What is the half-angle of the conical shock wave formed? xtgp 3;u**n /0sdplzp

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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 Mkfvfr0fr ,vg qk5 d7w:3 /cpr/ach number of 1.05 where thevrrk fd,f k3r0gqwfp5/v: 7 /c air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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