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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 falsuu. rgvah/(f:e 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 conductedzk5. lq u5c( ng81jgyn 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 sound in a steel ros dnat/.c*j h ej86o9ad?

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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 sot*2ho9 7bhf sound? (A*7 bs2 fo9hohtssume 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 sound, the velocit*n2o kcm ebtrh/ o9p .ki81;rwy of a 200 Hz sound throuompk;1 ote/ wic8r.n 2 h*rkb9gh 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 wave wm1(gzr16a(zg 2jqft,6jrsu length of a 400 Hz sound, the wavelength of a 200 Hz sound in air isjgjt,qf2a6 rmzr1s1u((z6g w

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frmxk +sn).41v1 +xklyd7 a sk4zbu;qwcequencies 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 of5f9gwuvs* fecs -69 frequency 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 * ejwn+s1tani k*5m8 cf/dm, ball directions. If you move to m5 /af j,tn+k 1i*nsd8bmw *cea point twice 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 proportional tos:yqrhnh3+ew i7d v7dy 5m/a2

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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 sourc2 uizj1ppyozp0 c 82nvg: ddkrmt /172e at a distance d from the source is I. What is thepv nt kmy0/2p2dcd p8i1z:u ro2g17z j intensity 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 fofk7p) xh4nqks j /*;is radiating equally in all dihn kfps;7jq*o xf4 )/krections. What happens to the intensity 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 distance from avy5uk3z,1+ua gj, apm qlwt z 229b8za sound source that is radiating equally in all dirza k1vaj32 g,92+lam8tb5 ,pyzwuz qu ections. 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 increasesur 8 kq:*nlh7h 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 tosbk4i0g *(s aune. What characteristic of the soun(4bi g* uska0sd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "louzc fv3 mp8/l67hc*fhi dness" of a 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 "vhpfdh :(3 4kcpb 7(japitch" 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 w;v q hf 0c6nj,h1wtc0:y o:myeater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves1lir:n0u rmei7z2kfwx 78,a m 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 the sound wave gene6 n,(;xjlowme -wgs 4orated by the guitar as a r(osxo n,m e;j4 ww6gl-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,ognva8.a3cm:v *je t+ 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 ar9v8-z: ky5h rj.aqa)aygbe;se the wavelengths of the three lowest tones prod-):ea vk baj .h5;ga y9r8yszquced 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 / v*1dsl,j1hehvw8s7ja) 1iaj4 jjqjym e:r9an open pipe of length L is 200 Hz. Which one of the following ay1 l i9 wrjj)8dhv:*sjs,ve /jjm4e17j1hqafrequencies 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 resonating at its fundamental frequency.g0ls.9y7 ec1q w cyew1pecl4 / Which statement /7cel 4yc g1q wpwe y9e1c0.slis 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 whic0qvn e:8o gn)sevfn7.h is open 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 are the wavelengths of the three lt a0heg+g j4eq+q9eeko39 3kjowest tones produced by this o+g9303k qhe4 jeja+ek 9qegtpipe?

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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 lenzc.: 3.l d q,rbcvx7djgth L is 200 Hz. Which of the fo7qr,xz.j.d 3:db vc clllowing 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 resonat;xhh facp55g(uj4+ vking at its fundamental frequency. Which statea4k +vhp5fh ;jug cx(5ment 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 speak :zfizk8y )n1zers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when t:)1 kifzz ynz8he 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, the two sound wavelff3zr n8q3 py;cjk kf (-;y.us 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 ax rokjia-b )ar09;0m a particular beat frequency is heard. What happens to the beat frequency a xai-jm0barkr) o9;0 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 explains 4 45s5lldu my4dj 6scamn(y8d

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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 frequency heard by the obshec,k;id-b c-p: ,k;7s:s gjso0a ecyer:kp,k--bsig7h ; s o dys0:,ccja;eec ver 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 frequrz eydk(/sruux2 f9hb 6t-s sf/j0p *1ency heard by the observes-skdezrh/0xf j*u61 9r/( bts2puy fr 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 by a eim px vzbg (nggv.by-+(98 c6fa.9gg6egyv z-(+i( bc mnp 8bvxctor 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 m/sq kk6i-b2(( zomard w;. What is the air temperature?w (zm2;ar-kb6 iod kq(

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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 sound in ai o z t+du6m7qtmv,v.x:r 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 w lfi)/u yyqd001hm)asound 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 reflected back) di hwym/0fla )y0uq1 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. Thes;q :ly:m9 ek6kcw 30iwr6g;6ppjur x 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 / eg/bfch,nj:/zgj2b after seeing a flash of lightning, the distance to the lightning strike is fjhbbz /c,//gnj:g2 eabout

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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 ow (dp3-c16m- gxg m 0fbeks6gon 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 dee sk(hy * l(dqsv8kkq. 2hrt)n5p is the well? (Ignore air resistance, and assume kyqn.(stdr ksl2v*h(k)q h 58the 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 *ls6xcpw4dq1s/rd4 rsound 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 aticd/nq9 o4:uux khmc.im 2e(6 $23 \; ^{\circ}C$ 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 wixsvn2)h ze 4m0th 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;yu+b fy1zu+ l a 70-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 of two sounds wb2,bk ;ph0y3r klia5: b/qelaith intensity levels of 70 dB and 5ai,/ye qb:k0khba; 2 pb 3rll40 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 -n3fy q dukcl05e5d 5e,0qq7 jp g1ribin a garage is 100 dB. What is the intensity level generate3dq5ge-7ijbnpr00 lc qdk5 u5,ey qf1d 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 jl3s omwdsb+s*9fa) 2from a source that is radiating equally in allwaosb2d3ms* l) s9j+f 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 sozfa7ppvbw1 +2 urce that is radiating equally in all7fpb2p +vzwa 1 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 aboupw 1w 9 w7+y9ceisi g.5yt3ggnt 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 fromw.cstgg+y wpn g71e953w9 yii 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 barking8eb:p0zq 0: 5joazhai dog. What would be the intensity level if two identical dogs :zb 0qe0zho8:jpaai 5very 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 lely)99s+9tgm un3plnu z3l-t ovel is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assmn+oz l3y u993-g9t n pl)usltume 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 dind9 rryiii4 )py(;/ t( svc0ccstance will iys)n/pcrd trcci i4(vi(90 ;yt 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 complexmvpo( yz*-2f4u1; wp) dj qpxf tone has a frequency of 1200 Hz. What is the frequency of the fou qpm wdy; j2*pvxp (f4z-1ou)frth 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 is1e y d, blh)qtt.fupt d.e6o+nppxu e 6/:le02 900 Hz. What is the length of they.dftel6p.bdl):h u p0o eep2+, te61/uq xtn 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 q nbxv/qj4* .j+8lvkqis 400 Hz. What is the frequency of the lowest tone that will resonate in an jk x.qjnv /4+vq*q8lb 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 velo*m s6c4ll-md scj5hdgt u z 8mud1*blie/ ;4n;city of sound ii;hz4- db;u4snlc1c l6*e5mjtu dm/8sdmgl*n 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 is g+g( bnbz) sql3aa d-5$20 \; ^{\circ}C$. 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.ln u; k1(2u9tj2sb qlp What is the frequeu1knq9 (usl22ltjbp ;ncy 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 shortest pipe closed on one end that will ha3fgz7qzx)v0 n3ou gbpfc*: a-ve a fundamental frequency of 60 Hz on a day when*bfq c:f)zuxg o p303-v7nagz 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 ib6-wp-re(l j kvisczh0o+ z5;)7zws vn 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 q8hkq q)kmxg+tk)jne * 273 rxthe 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 fnz qoclh4+wg1b89: a xv4be:is played when the speed of sound in air is 340 m/s. What is thea+zc w1b 8 vn:x oe:hlq449gfb 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: one is open and the other is closed on ondvqs+9 +z2mj 5mhyob7:.x njh zk((gve end. szdn9j+7.+ 2(jqxmz mvvoh y :hb g(5kIf 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 air wherekw*wh46 y4 sj6dq)hve the velocity of sound is 340 m/s. How much farw6*wjhhqe 4v 4k ysd)6ther 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 frequ7 e7a 3to,k q6.yiwvnd/wfo4 pd wn7+pency 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? (The sound speedk 7p.nid4 y3vdowfnoqp w6 7wea7,+t/ 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 44i o97tz-(5b;zv q, aqt6bo( xqit.zba 0 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-w57lhholc+m qy )w 0n;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 i 07q5 my;wwll+ hno)hcnstrument?

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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 two horns are 6 m mhc v38ak,yk zrvr6ni)9s8ze/h7 pi 51.b jzland 7 m respectively.5za zv3i,rnykl.9 ch17b6rj /i pz8sh)k8e mv 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 stringse e1;wqq+s:e pa2ogj 1 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 stringj2esqw q e:;g 1+a1opes 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 twice the w :ygu;v7o cx4y1fw3ospeed of sou ; v3y7ucx4o gfw1wo:ynd. The observer hears 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 freo(e ld(37fdhfde :c yx(e,yv8quency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears lfyd e3 :d8h,coxyd( efv(e7(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 with a speed of /prk*vylelx /8dtw xlqw1 (3 :30 m/s away from te( /lxl*wk3drwytv : pqx81 /lhe 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 travelitsp/n urg1i,h44 20 ym:e g )h5ngoessng at 35 m/s on a day when the speer)ngehht0mn, so2i:4g51 y4u ssgep/d 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 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 wh o+mc1yadk ,ns)lnm3;a 0;wvhb3nuf +en a train approaches with a speed of 30 m/s. The frequency of th;n+1,ka)mdvbcso; ayn 3uhwf m 3 0nl+e train 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 km/h. The train blows its 400-Hz whistl, f b d)mb4jfyusrca0+.;)ozh e. Take the speed of sound to be 340 m/s. What frequc;baf brzs,f4) oh +m0jy).u dency 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/4waut2qxh;z/w c cy( stationary train. The train blows its 400-Hz whistlehzxc 4/2taqc wwy(u; /. 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 x hlyd0t1fj4 .km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear t0yd1jl4.fxh ?

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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 ieuz2g 8i 5d8t2 +7tbzi*hvkuyou at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 7uu2t5t zihi*g+8zdkbv 2i e8m/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 tfv0tqc4kp ap*abvo):/ m8 x+orain horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observef/q8v* tbmco+oxaav40:p k) pr 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 isutuj9vt. ;e.;putl: rr,tk9 x++ wcsc 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 wit9uc9;tp,j.ttl ;uerxsct wk+:.rvu+h 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 sent v5n jg/fvhpt56 l*u(oout, and a 42-kt oughjlf655 v(n *vp/Hz signal 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 the conical shock wave produced by a supersonic uxy00n-;p )m vqc18dy pf swz4j7v2kk 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 ofcv+e tbi,3)e0cb7n ah Mach 1.4. What is the half-angle of the conical shock wave forih7nbbe e,cc0v 3+t)a med?

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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 fromn7xz zk5o8akur y9)3hh/)bg m the United States to Europe with a Mach number of 1.05 where the aikakyg 3n/bhrx7 zmuh)9z58 )or temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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