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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 ;b9lq;)n md+; auvoqu 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 thrm4zzd8 uhhg2tvd9xv,7ct7z/ ough

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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 st2awxw(d zxx 5 :0kq( eog72ztteel 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 happend mji0bz7)b7 c dkpu7,e5 evi2s to the velocity of sound? (Assume that all 0 zk5bcdpd ejm77i) b2e7vui,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 sogpj .a(k5( ac6 kr*urzt9n*dqund, the velocity of a 200 Hz sound through air qa 6(p*k5.g*ckjn aztu9 d(rris

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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 dl1m((9( g6z-q h:gpa+ jzbqvt c7nucwavelength of a 200 Hz sound in airz d qmpqt1gnh +-(gz9jc: (lcab7(v6u 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 greajn (b yuzf1rah )(p2-kter 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 less than 2scfcr)z5f -anz gi49;0 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 directil2abt..j i1zm ons. If you move to a point twice as far away from the source, the frequency of the so2 j1m.i.z tbalund 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 proportiop qqq,5 ha34h,ew 4gsunal 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 sou5c9neab6h0bqrr m4 k4 a /o7z:cfi854fsa q qkrce at a distance d from the source is I. What is the intefme qn45f: r/46rqc akqb57okzs 894c0bih aa nsity 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 /z0avp 8hu6a:*34hji xshffp sound source that is radiating equally in all directions. What happens to the ip vh8jasa u60zxph4h*/fi:f 3 ntensity 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 distc)g (/itxzi)oi5t u s5ance from a sound source that is radiating equally in all directions.g c))it( stxou/5zi i5 What happens 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 incdes4k0-ah 1i *id*ke xreases 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 characteri l(h 2pit, eu9ww9gk p48lvnwz,24arbstic of the sound increa panz b,w 49 v2kwl2hglur 4t,e(9wi8pses?

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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 als6k z v97+qqv 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 nty)9 d v;c3jtgten*1note?

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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 nxk01clh;u +eair 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 displacmi3wr jo wafo) (n8pi,y.54fiement 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 standinub;xc2c. f;e1qt eub 1g wave on a guitar string and the sound wave generated by the guitar as a result of thisb2;;1eu xct .u1b qfec 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,3 g,(xmqg3wsw csyxo*rq:/r( 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 wavr k ):x0f5t;:d8 eqk lkszkwy,elengths of the three lowest tones pr;50w qkzref:yxdk s :t8)k, lkoduced 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 lengmulv*pcx);c 6 th L is 200 Hz. Which one of the following frequencies will not resonate in the same pipexcv)6*clm; up?

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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. Which 3-i gbk tbj(6x4rwxx7statement is correkx6 rb7(-igj 3bxtwx4ct?

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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:gu0 imab bhvo/ :c;n9 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. j*a- mhe1nzrl;p4wg 1 What are the wavelengths of the three lowest tones produced by thi j glm;wa1ern1pzh4*-s 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. Whi,y / tcbuh 1*0ywwobiztz4kyl3y h*74ch of the following frequencies will not resonate in tt i hyyc3wz0btyk1 7l,*h/uz4 4y*ow bhat 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 at6cpzo6u)bz hw1ro +0o one end is resonating at its fundamental frequency. Which statement is cpho0o )1zrzwo+u66 bcorrect?

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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 rlxu3 vpe0;7q;/m yy rthe same source. Each speaker produces a tone with a frequency of 200 Hz on a day when tepqm 7r0xrvy;u3 y;l/he 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, therbo 2b4jk v ,i1xk5:ty 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 3o x7w.d (du/dh1iogyh*v:kdand a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones i wiugkoo*(:d1x 3dd .yh/7hdvs 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 expl+ rt:v pqo/ tx+n;5:sy5 aibpmains

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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 obserxw id sfk-f4q:bs,9h 6ver. The frequency heard by the observerks ih:9 f4d6, fqw-xsb 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 fwd--n;rry 18 ogd0ndz7x5d yw requency heard by the obyz n--xn 5 1w0 8dd7y;odrgdrwserver 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 half-angle will decrease bym9a l+wwq 96qq a factor of:6aw lm+9q9 qqw

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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 zsf4h(4 clv1 lhg58vg7 -fqeyair is 352 m/s. What is 4gzhv hsq41ylcf l5-e(fg78v the 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 o +wiwks+ug8 ab)a7 1jjf 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 o s4l7n6cznow u;;lfxg; - kz8zf sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that refzk; l4f -wo;cx8s;uzgzn67nl lected 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 45tzh ;c8 ck,l du/h0 ifpdt5qecho 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 after seeing a flash n eo1biu)*7cxof lightning, the distance to the 7n* ocebi)u1x lightning 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 cliff9f imfvtl ,.dubk8 r/: 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 b;q,4cmdvjo1 a deep well and hear the splash 2.5 s later. How deep is t41qmd;bv , cjohe 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 68*rg mypmna;kj-x10x0 kkj i 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 a78c8by die(un t $23 \; ^{\circ}C$ 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 xp*s9(8ochrkq u2h5d 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 bjsb(ykk 7h*0-).5sko bvgh sj5e- mj 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 intensitqc hpn ))up+fj3w pxy 26y);zgies of two sounds with intensity levels of 70 dB and 40 dB?6hpqp+ x; 2f)3 ywjzcnyp )g)u

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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. W3h9l;j .zzn*b dlxniep87sc9hat is the intensity level gen*cz jnb7 ldps;li3.e h8z9x 9nerated 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 distance of 6.0 m fr,/od0v5bjin:x-g 7jgj nv: kfom a source that is radiating equally in ad-x7j0g :nvf: ik5 bvg,jjn/oll 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 r b-kf8a( hxcp c;x9htv0yz5r:adiating equally in all direc: v5x-b(ck; 0z8xf9tah hypr ctions 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, whicyph ;9l3is/kx h is assumed to be uniformly distributed in all direct/yhxsk9; ilp 3ions. What is the intensity level 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 dog. What wou0*1fgsp vqv34bfk- hcld be the intensity level if two identical dogs very close to each other ark4f3 h1s*qg fb 0cp-vve 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 +g:4z ,t4:+yvucl o8zyffonqintensity level is 60 dB. What is the intensity level (in dB) at a point +4 l+czvuqyoy ,:of:znf8tg4 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 wh.xp/r-h c fk*w: wdv+rat distance will ith-.: rwkcx fw/vp d+*r 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 kvdb2 i);qe u 1tdl(7za frequency of 1200 Hz. What is the frequency of the fourth harm(q )b tu 2ek;vdd1ilz7onic?

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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 dsk1nc2v8ug(:wf u +:p1dbf p the length ofwgfcdu 1f p su+n::pbvd(k1 28 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+)p agfbgejq (zjkai: ,e o83) is the frequency of the lowest tone that will resonate in an open pipe of length8jzg+ia ge3q (,pj)fa:ko)e b 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 so3j-x7e/ma kkc u6h0 elund in air is 340 m/s, what is the frequency of tek0u3 k6l j xm7/ech-ahe 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 tf) y9;ne cle4mhe 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. Wh:*wopa oua3v.3 l vb.*l)cfnfgg77 qaat is the frequency of valg.37n 7qfouof agp 3: c.vbw*a*l )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 tg-u16ba: he; z q8wogjhat will have a fundabu;a hj81-gog zw :e6qmental 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 tempcp8c;m 6gs vz4erature 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 whe 7ravt* ,rk3kvre 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 sasw::5u :o*pv my.b,qprlv8d )mwccy10k)ysound in air is 340 m/s. What is the fundamental brs:up0aqp )lv::c ycvw1m)m,y8 y*ksdo5 .wfrequency?

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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 on2:gj7 q t3b6ukn y8ovxe end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundakovuy6txg :83 b72jn qmental 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 the vel7nd1xk3 scw4 hocity of sound is 340 m/s. Hocd 1kw47n3 xshw 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 frequency of k:br:,)p lys*v:r8;k j s (mm iawx3exoe3e9f500 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 t; b:wlk erko3 if 3 )*ersm:9symxp,x:8a(vjehe 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 the beat fe2 fnlkb2,i t3requency?

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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 freql qul;ro 6.dk buv/dq74 b,9c:p wi;eguency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is th b9i ;l/6lo.b u:gwp,4 euckdvd;rq7qe 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 souno2uybi5 ,x, ugq5vx1axfidi v63x5i so-i0r5ds produced by two horns are 6 m and 7 m respectively. What o ig13, ufxvr0x- 5x 52,qvdiabus5 iiiox5y6beat 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 an orchestra are fo;twjqj i/6d0 fund to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one ofjw d/ f;t6ijq0 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 aa2t (pz(nqe290mc j0rkhglh1m/ tbj3 stationary 1000-Hz sound source at twice the speed of sound. The observer hears a fre(mg23bj0 9z0jh tpt ecm ar(n1q 2hk/lquency 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 4oldnx k* )b+8fqke b)4i-lf*xfz m*r8kry)ifrequency of 1000 Hz) approaches a stationary observer at one-half the speed of sounyr*8)nl4eox-ifkd8 kqbxb 4fzm+kir l *)f*) d. 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 liste:gkq w,**ixp,3h1 agkymdgvp) i8*hiner moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound spegk:gwgipaq3i* ,*, h*m 81 yhp x)kdived 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 daym3w (opdgvp:u a17m1(i;brdt when the speed of sound through air is 340 m/s. The car approaches d1i((uv mg; t pmw 13:dao7pbrand 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 stationary observer when a t62sa m 3f-xvjohh+-pjrain approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed ofx s2-jo+jm a vp3f-hh6 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-+jxg5e* lu q *vt-p6cd5gz4 hyHz whistle. Take the speed of sound to be 340 m/s. What frequent5h4 6plvzygd**x -qgce+5jucy 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+1;fobw rc-yt km/h toward a stationary train. The train blows its 400-Hz whist1 ct+r o;wy-bfle. 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 away from you at 120 km/h. Th7yo pak *u) h5cmhk)1av/jiqrh* p./le train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequen o)/j*5iq)1 /u h p aa.*vck7rhlmyphkcy 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 whistlx5++q czdosemth26he 6 ,*zwqe, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is th5wm,tzed266ox qze++hq*hs ce 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 504tdt,l h6ioj00 Hz. Assume the speed of sound in air is 340 m/,jhi o4td0 6lts. What is the frequency 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 jgmpuq282 ji .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 approaching the train with a speed ofp8g2iujm.2 j q 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. x 1)jff p/:vsprrua)/ A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the sprxpf/asv:f r) pj/u)1eed 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 supersonic airl 7yifp(m7(bu craft 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 Mab.81/ui4rassvyi6 a qch 1.4. What is the half-angle of the conical shock wave foissv1 a8q6r4 ua yb/.irmed?

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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 Eur5 ieetork+n;, ope with a Mach number of 1.05 where tokn; et5+e ,rihe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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