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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 followiph-iq 4* uwwf:9caed 7 cl./qhb do1)zng is a 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 conducted fastest tr uxi.,)u5 gou t+ jgt5xw,fs7hrough

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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 ry65j e e-; 0*4e8joty sbbuaexod?

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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 happen0qrf xipw+ 2t+g2 lsl/s to the velocity of sound? (Assume that all other factors remain c x+rp+l2qwfl 02sig/tonstant.)

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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 velocityto zzu2aa3 06. 9vkpeh of a 200 Hz sound through 0zuz ao3hp.v2keat 69 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 400 Hz soun-, (+oy z3ttrtlt5 ggjd, the wavelength of a 200 Hz sound in air i lg r-y(t3t+z,t5tg ojs

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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 m0jnxi ai8t ikduwjp 26/ 2o,1called

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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 arg: 75orvhbgq- 2h vzdw-,ej8qe 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 emil:hc0:8o ra xstting waves uniformly in all directions. If you move to a point twice as far away from theolar0c :sh:8x 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 pr*e ak3graqq9 95kmuy+ oportional 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 f)ggijr ik0 /1d,qmy.gq3x2w source is I. What is the intensity at a distance 2dfw2y kgxi,3i q. rq0dg1 /m)gj 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 radlj (9t34 uefappv(: aqiating equally in all directions. What happens to the intensity( 3(l: q9fejp4aut vpa 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 distaln4i 7f6 dqm4lnce from a sound source that is radiating equally in all directions. What happensldmqi 4 f7nl64 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 as rm)2 y/a1sumagl m- b.m-e37 dg qedz;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 characterisq/ y 0kow3xhd3tic of the sound increases0dx33oy /kwh q?

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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 me0ja8y)+ify ym 8y* ajusical 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 x(feow)v8p4c jaej-+0anz pz 3u+* uy"pitch" 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 fromzu3;a92:8 lniynh hg0w h k8ux air into 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 waves a+o2f,u vmzh5jre

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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 gea b e-w2klnr)xh 1 m0js11bqe4nerated by the guitar as a result of this vibration. What do these two waves have in commo 2ble ra mwen1 jh1)0sq41bkx-n?

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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,rq*3 *ght 5sqkld*c/ a 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 a vf(agqng*z( igpa p5d:6cy*0 re the wavelengths of the three lowest tones producedcfdiqga (*p60( yz5g*v:p nag 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 lengtkats h):4f857zewqz5 vhxd dos9d03d h L is 200 Hz. Which one of the following frequencies wd hs 975hd e 8owk3vzts0qdzda :x5f4)ill 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 its fundamental frequency. p7n*+qey,2xcm d0h/hfp3h z vh.g jkcam+.1 u Which statz.e h. 7 cunqhkafm3p g10+ vyp/h+2 x*jhcd,mement 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 othen xkq)o)gj; e6r, 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 wavelenyz (yfq +b:fd)gths of the three lowest tones produced)b( d yf+yfq:z 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 clofbj5 38 nymut:sed pipe of length L is 200 Hz. Which of the following frequenciesu 3j tybmn:f58 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 f2fqn3i5;iyp0yr mqv445 k tgis resonating at its fundamental frequency. Which statement is gk5tr35qf2p4yi vf0nmy4;iq 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 sqna587cx,2l hc ut-cj5fz 5ocame source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed n 7ohlz,utqcajf-58c2cx 55 c 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 two souarg yfge6e 3o4j(7tlhg* egk9sb:* y.nd 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 frequ gef1;u9 (t+rv(y m3l+gw wpifency is heard. What happens to the beat freqfylrg1e(+;v 3i wg9ft w(m+p uuency 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 explai; -3ze-toz 7ec skhf4fns

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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 freque4 95l/ 8k +e9zz7mtulsc bsfwyncy heard by the observy sz5/99k8s z+ub left7wlm4cer 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 station:torlv6;,c l ;5urjc u(x1hixary observer. The frequency heard by the observer i; rx l o1(xtvch,uci56 :;ujlrs

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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 do cj8f(p e4xbr1dbm j6;uble its MACH-speed, its half-angle will decrease by a factor o p;bfrb14 6e8cd(jmxjf:

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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 soug/ f7969dv c42yqxjuo uiw6xynd of frequency 45 kHz in air is 352 m/s. What is t jov9 6qxgcfw9y/ 67ux24i uydhe air 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 6m2y*q7uvc ejsound 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 emi kz1ul*sz9ptfw -afk,l 5p3 s*x7ug-kts a shriek whose echo reaches it 0.0250 s later. How fast 7ux,f -k9g*3 p-u1l5zzskl pk* awfr 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 uzik:82orkixk0y rz4.vw+ h zw9h+ 4ftemperature 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 distance t4 c won6u 6qej95inq+po the lightning strike 5nu+j9qe nwop6i6cq 4is 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 cliffhte : 6k+,sew zk/ew8f 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 splash 2.5 s later. How d 9,zcn7 4tunzreep is the well? (Ignore air resistance, andnr z9,u7 cnzt4 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 soun6 ;2iq)/yxy +houf2az ylyol +:n+w wbd 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 ia(1yca:dybm;pn+ . p+n, ud;ii+zl $23 \; ^{\circ}C$ 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 wij76v2u fk:)rji7qu reth 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 *my (.fc8ojnn-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 oeih0wad;r z94f two sounds with intensity levels of 70 dB and 40 dB? wriadz4he;90

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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 15u9cej cl2gp 64 engines in a garage is 100 dB. What is the intensity level generated bujec 4l6gp 2c9y 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+ 9 exhdnje81c.0 m from a source that is radiating equally in all directions is+x ehejc8 nd91
$6.0 \times 10^{-10} \; W/m^{2}$. 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 owv;1soxw0 24j( e .ff 1pbfa* iuw dejozzf(;:f 6.0 m from a source that is radiating equally in uw1apz( zv.d(f4o:e*;xf10ij bjo2;s f efwwall 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 power, which is assumed to be uniformly d borhixpr,dvaf ,.3h*p/9 r/fogq 68 distributed in all directions. What is the intensity level at a distance 5.00 m from /por8dbf ,pr,3o. r ad*fxvq6/ 9ighhthe 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 68 xf-9y3n2jie en1yjd5 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very ceyj 38yx-fejd9 nni12 lose 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 dBdp (i bzye1so:8t4ne8. What is the intensity level (in dB) at :4z(nt1dyoep8 ies 8ba 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 5.0u4x2 g c;dvg v.husw8; m from a point source is 95 dB. At what distance will it be c2huvux. vd ;8;g4wsg75 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 1 8d)3/;m nixrdu by.nz200 Hz. What is the frequency of tn.nd8) md 3/ux rb;yzihe 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 iz)/x-3 aedh ld6lo d())pgqyjs 900 Hz. What is the length /e-)zaq) y)pxdj 3l6odhdlg (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 r 45v9)7f2vf3mmh -ag lj1)szpx xhgcxesonate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of lengt-gmxh79x4a 2ljv1sgxhm3 vf)c )5pzfh 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 lenjo x3g;cm 1uqcv+v5 8j4jbw+ tgth of 0.80 m. If the velocity of sound v ;ow mujjg+8jcq5v1+ct 4b3xin air is 340 m/s, what 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 where the temperature )ej-fk tcu-k0asr8r 0is $20 \; ^{\circ}C$. 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. What i3 tv(g djnxhz :73jrj+s the frequency of the t7htd gxz3: vjjj(3+rnhird 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 sho6 l0 qyldnw.53wvrp)o l ln8j:rtest pipe closed on one end that will have a fundamental freque6vylw.l0nqjwr on3): d5lp 8l ncy 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 s o7y5d)-hw .y2g fjey39;cw jqofn6hwhere 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 rom i sfvsyl/;;t+56.;lc u b02zsviv- bpnf z;iom where 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 sound in yfd(das796pnd/q 1 xsair is 340 mq s(1 6fdsdadp7n/y x9/s. 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 8 pani;nw)nezd: w0,0whnir9length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what0 zwwhwn:pd ia89r)en0 i,n;n 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 air where to nw ( 0ndo9v7qs8eqf2he velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an obse2(ne0qswq8fn9d 7 v oorver 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 kri;y(ng/ 8hq b )xtotfm;+5iof 500 Hz. If the distance from a person tt)x;b / y +gkinot (;qirhf58mo 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 444 Hz. ab;x1tngo. 7 kWhat 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 om9 kl8n,vw7htf a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the f89kwmt 7n,lvh requency 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 producb; yhshmd5t6r20 y 2som-h/oved by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns ar ob o26h0syvmr2td;/5-s hy hme 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 vicza9wfl:il y0 /6s8c iolin strings on two violins 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 the tension of one of the strings would bring them to t:lci y/l6a0 fci89swz he 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 twq- , o5qb pjohz4w)2avice the speed of sound. The observer hears ao5o,2q jqhz a )v-pw4b 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 frequency of 1000 Hz) approaches ,jwmt0wa dt,0bqp,t:r) u *gve/c r9ra stationary observer at one-half the speed of sound. The observer hears a frequency of0gcrt,a )wt 9u/ wrbq0 rt*,,j pv:dem

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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 with a speed of 30 m/s-nwuha,hy e e 38acm./ away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s.h3ew,/ a. hmuy e-c8an)

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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-k4t07 )g0:bday onlwhHz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadsideh kdtnl70g)by4aw o: 0. 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 x( uwmh:/tnl 89aec- sf (r*qxa train approaches with a speed of 30 m/s. The frequency of the trai* t:as9 -cf/ ru hlxxwqmn8e((n 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 kr8q *yy;h9rl y-cz( kam/h. The train blows its 400-Hz whistle. Take the speed of soundraqk(z*y -; hyrl c9y8 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 train blows its 4mowo0us) (vc :gl31;rz nq4uu 00-Hz whistle. Take the speed of sound to bo v4ul u gzs nwcmu:)30q(r1;oe 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 e8)x o/iy,fm+ ry7,(y nmqmv ffrom you at 120 km/h. The train blows its 400-Hz whistle. T yf,mqy/ m+(, io8e7mrvxyfn) ake the speed of 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, and ytq ncw7gl2;i4 ,g aq;gou hear a tone of 400 Hz. Take the speed of sot g,ag2 7g;4;cwqlqinund 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 traf,y5*.bjg0z 14ipaf)zgrq o vin horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train w gabi)51 f0jfg,v4yro p.zq*zith 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 iqjeb/crowj16v5 t w-4n air is 340 m/s. What is the frequency heard by an observer if the c/16-jv to54ejr qwwb 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 s b ig8v41zlyqq9a3u8 :ym*km cs js3p3ignal is sent out, and a 42-kHz signal is returned. As8 :9 lmqvijmzsa43b3uy8s1 qp kc3y*gsume 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 produce9.yegkrh06 tsp 3*ye+ nf o5akd 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 1.4. What it zwb(n6*d fcm1qyv716 t3hgzs the half-angle of the conical shock wave fzcw7z1v* 6tqd6 gtn 1hbfm3(y ormed?

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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 witej :9rv0bd3 rb l)*ggqh a Mach number of 1rl3qeg):*g rbj 90dbv.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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