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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 yn4gg n+ f)/kwfalse 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 th-vlz742jg:25qt bydv-f bapt rough

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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 2)do8 cg t/kax n/cpj;bf, 5xlsteel 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 happen,f(xqnw 22ixp8b *tuf s to the velocity of sound? (Assume that all other bq8, 2 (*ufxpwif2x tnfactors 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 ofk9mmopabnx:x (-a7n9xv 19cp hzae*u3 ,p1q c a 400 Hz sound, the velocity of a 200 Hz sound througa( ma,oc7n q: exab zxh1-x k3pn p91uc*9p9vmh 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 sound, the wavelength of a oi+ ;j 4y,j2wyrwlo3v 200 Hz sound i ;4jrl3+woyj2i w ,yovn 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 frequencies greater than bih:3r- 08iothav)uo 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 thant da,(bw ji:op1q vg-, 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. Ifqki 3v/rb6nc3 )cpi h1 you move to a point twice as far away k)bh6qc1pi 3 /v3inrcfrom 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 divergingcxtfw :9ah;k s*m.;cq 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 the source i4wl/0i s i1u s+kuixi4s I. What is the intensity at a distance 2d fr+xiuu41w 0isis4lik / om 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 radiatingx 70 xm1+x bar4rao-m;9n cspm equally in all directions. What ha 9p+x m0-1o4n;mxb7cs rraxmappens 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 fromnascq ,rsf qn.6i e dp ag*wvgv*g0j*3.0 /jo. a sound source that is radiating equally in all directions. What happens to the intensos0n jv3w.a gvpsf*g*6 jnqqr0 g..ia/ *e dc,ity 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 increasn46* b5g6 f f6yr qcml eri,:fsn m7j:r1gqqw(es 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. Wha 7lw mj5bw:.myt characteristic of the sound increalj.b:7mwy5 w mses?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn w+xoivm6i; lfc6t) bb 1s+cqsvlq, .(ess" 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 "pitch" of a musical nty49902l s :ypv jrhiyote?

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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 bw9)dcmltz -gvty;*;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 wv:u; zc2d mq: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 kbspzu;:-pc,ai*8* ;qf rjlw on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in cos;k*8cbf*,api-:lqzu rj w;p mmon?

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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 59 (ucjyj o9/cu:jpjeis open at 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 of length L. What are the 7/5z6sw uz8**islc2 v tibh pawavelengths of the three lowest tones produced by this pipwh6z*85blpistas*7 ivu2 c/ze?

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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 -apqho:xp) x fq4gbs* 851dko open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in tx4qa g)ph*8kosx15:- fd qob phe 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 fundament7 )/z she2ofl21pvw vzal frequency. Which statement isvo1esw zfv2lz )2 /ph7 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 whic2bzixmi:u y2w ;1,zr)*kx 3men / )z;fifw ahkh 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 oyzhv-m 41ql ;yggl2bn4 q0of6f length L. What are the wavelengths of the three lowest tones producedq4o6qb42g;y h n1fgvzl- my0l 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 closeo8v .3pkk5(cegklu7wvs ;qa + d pipe of length L is 200 Hz. Which of the following frequencies will not lk cp5 g 3vo(a;.7qekuv+8wsk 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 i y::2lv0kwzfa hg (v- c4s mn,lfaqc86( +irkts resonating at its fundamental frequency. Which statement 6+ kiclg2(fzvwv(yslmh acr0 :8kn ,t-4fq: a 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 thaw 2;8 wipabaa+qd0x) e same source. Each speaker produces a tone q+)pbadixa0w 8awa ;2 with a frequency of 200 Hz 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, the two sound wavez1 -+-rjj ivjs kgo3kn77+ sjj-l;h pws 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 heard.5- 5s9o;xf fkcsohzy) What happens to the beat frequency if the freque)h;x 9f-zo5ksy s cof5ncy 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 explaqe93 lid- i:axins

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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 gme(l2mp0qblvd2wgo 92r8 pp a /arm8at1g-(stationary observer. The frequency heard by the observerpb/8glw(m v(m9d 21rg08e2p -a l o pq2tagrma 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 deparwz+wj 4g mzqy+4 h3ux4ts from a stationary observer. The frequency heard by the ozx+ 3wm j4whgy+zq4u4bserver 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-sp yl2q35 mfwxf2eed, its half-angle will decrease by a factor 2qmfyl w23x5 fof:

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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 o8 b:mnp,sd. bbf frequency 45 kHz in air is 352 m/s. What is the ai,db b .ms8n:bpr 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 pyly-s;gfn0mu n5.r o1dc9y3t 1il8 f the 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, a ,gzui;95qsf n bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the 9 si;,zg5qfu nsound?

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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 4.4gf6 cuso(-c +adlk,m 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 ofd+w3rdv*lmo ff(z p0yt4q/h4 lightning, the distance to the lightning strike is q3rt*0(fhddw4pz lv/o4 ym+ fabout

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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 temperature -lncb,ai*smpb.e he9 :y ;q b0svec.2is $15 \; ^{\circ}C$. 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 deep is ai:udxe1 vdz5x t569c03f ;eq w3 ogtlthe well? (Ignore air resistance, and assume the velocity of souuwgt 5ield9taf5z cov3x1q;dxe30: 6nd 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 of frequency 500 Hz iyz,amb++/5sysc 4wngqo9 t9x9:f tvis

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in ai3 h/ipy. o h4prm2/ymohtmc 8)r at $23 \; ^{\circ}C$ 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 am8ytf5* vm2 wa 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 v9vnnhbq2y ( /4d fy8msound?

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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 with intent a * ab (+vf381hzkdb/m1 xwbaxg*fr(sity levels of 70 dB and 1v8t *bhgxxadkabr *fzbfa1 /m+(3 w(40 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;vk 0t jzu1.230zxsud1bz gh f intensity level generatedfzhg z0ds.tkv1 zb;3jx10 u2u 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 ofu ambd v ))t86dlp /f:qdf/ge1 lst(:n 6.0 m from a source that is radiating equally in all direc(ll/)tnt fmb: dsvdqef1g)/a p8:6ud tions 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 equael,acre+(p12,3qygn/ep c h ce+ i1 dklly in ale e2r 1daep3lc1ghe++/, pckc(q,yn il 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 ass-, a (azmz l qppvvg.n;yg0p)e./+b kbx s7(fdumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the dogn- x bgv 0a(f.ypb dse, gpk+7/)mpvz.;qz(al?

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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 rfd-20y li l-r y*roi co;vx:5b -m2pz7+xxzi5.00 m from a barking dog. What would be the intensity level if two identical dogs very cpzib-zocdm50oyxlixryvf-rx l -+i 27;r: *2lose 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 dB. Whavq)8.*okrwmade34 cmqtl a(2t is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all akm mqo3 c* le8(qr.vd t2)4awdirections.

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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 )b*g*mnto/w y3qpf ,d5.0 m from a point source is 95 dB. At what distance will i pm**)qo3wftg n,b /ydt 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 frequency of 1200 Hz. What is the frid1 m;p97pnlnf wnud5a mc.//equency of the four/pc m5f;pnidu/m9d 1wnl n7. ath 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 rq7h) r 9v.bmtg7 htw4of an open pipe is 900 Hz. What is the leng7v)trmw g.b 49qhr7htth 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 6+7vn ,6izdv jemhu )gpipe of length L is 400 Hz. What is the frequency of the lowest tone i 6jdghv+) ,6nmuev7zthat 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( n)phks)k.tx ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequps) )hkkt(.xn ency 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 nt3p ehehk j1)bh+h5m0r+9jssi ,cn6 where 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 cltx21 vm :k8rwos)ph j.osed at one end is 330 Hz. What is the frv:h sp.m x18w)ojkr t2equency 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 ony- anw g5l-g v4piqg-p )g4 lcpw)re.: one end that will have a fundamental frequency of 60 Hz on a day when the velon a-wg- 4 q4gpy)rl5gwlc)g.ievp:- pcity 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 temperature is x oq3l0 q+)jko$20 \; ^{\circ}C$. 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 roon(u094gl5ku/4c zi8gfw h hbf m 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 wh y(;h;fb. ot5h /fzcqrwjk/6zen the speed of sound in air is ;y/ 6f.ztobh(h w fq;r/ckjz5340 m/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 length: one is open and the otherq:vfe5 mho+)f is closed on one eeqfo)hfv m +5:nd. 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 otsiu 3ck6/fh h2)l gg;f 800 Hz in air where the velocity ohu )c;/tshgg3 i f2k6lf sound is 340 m/s. How 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 f0m5*ip 48m6sk lex:sd imed5 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 o* 6f e5s ekp:s0m4m8dili5mdxther 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 freque4bwvvv a9*z -nt z1w.yncies of 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 j ccig/2m +0cwsam gl;09ud6g tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency o+;gm2s06 mg ccw l0dgu/ic9ajf 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 two horns are 6 m and 7 m respeqlsgz j/ft 8iyi. h2,3ctively. What beat frequency is heard when the horns are sounded on a day when the velocity of soundiy,2 h jg.8qfisz/3lt 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 (1 p1w ghl*g cj;,ua492jkx85 fhgnwqlmc7 lcorchestra are found to produce a beat frequency of 2 Hz when a frec9wacp7,52xlqm ;lg jg 8 w*h(fg1hnlkcu 41jquency 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 a stationary 100 9za7eq(2pgq3i9z)idj: k mqp0-Hz sound source at twice the speed of sound. The observer id jea7 9g2mqzkiq) p:q(3pz9 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 frequency of 1000 Hz) approaches a ui unu ycit4g::w.5-tstationary observer at one-half the speed of sound. The observgi:4.u 5:i cwuyt-ntuer 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 m57kc4 y(bn*7,clozj fro qv6loves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (T6vl4ocb(r *o,q5j7nk7lyzf c he 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( oz0vb ed1c+qr ,ur5v on a day when the speed of sound through air is 340 m/s. The cv+5 ,q1b(r ocrzeud0v ar 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 ruzglq9gt4 +/jnm:v+y e) ,ygby a stationary observer when a train approaches with a speed of 30 m/sym+qggnyjz4lv+9r):e /,t gu. The frequency of the 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 towapqg;j 1w* e g./ty c8s/ w53s(5zrc4 grewtehurd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freq;(tesr e*gg5 cwj//s.3quwy 8h rz wte5cg1p4uency 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 htzs9k), 7hg bh3zrc5.sd;f g its 400-Hz whistle. Take the speed of sound to be 340 m/sdts;s bgrk.95h3ghzfc z 7,h). 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 fromjza1g2t o 1i;a you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequ o;2jazit 1g1aency 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 7k agqadz(l 01away from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of s1( a lkzd70gqaound 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 train horn is 500 Hz. Assume t;jp unrr7x4jvxs + i,+he 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 with a speej+j+vpin, 7r;x s4xur d 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 ofnde2wf( q(s7 lm2iar8 sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the tra2r(l win8q sdme a7(2fin 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 signal is sent : etp18ek+ y xv8zhyhh(c9c/sx +w;ipout, and a 8yh/ xect ;i hys+(ec81kwph+9pvxz : 42-kHz 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 aircraft is 02 jwj-+sxtu xnw14nl $60^{\circ}$. 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 is the half-angle of the conica1.m gqz(xls-q). rh r.jq. / jnmn.fktl shock wavl /..x1q. g njzmhmj- nk.)q.s(rtfr qe 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 k7us0v1 xs 4nsStates to Europe with a Mach number of n4xu 1kvs 07ss1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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