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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 false stateme(agcq yku, ti/h5me;49 i0ylgnt?

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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 condujgaptr7 7ex h)(i jtf*j 673ujt(6 yxucted 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 np.,3plenkfjac,)n0 t1mjp 5rod?

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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 sou6yt)o p7i4c gkpq3 6g a:s3cvxnd? (Assume that all other factors remai7p43)tk: qgg ioy6x 36pcvascn 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 velocity of a+ dbz wf,)lqjjy2ucn5 7( z n*us*bvv) 200 Hz sound through w* u ,j lv7bsjz(b2d5n) )q zvcnfuy*+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 7jfzwxsv-u(o :4 9liqv1pw1b of a 200 Hz sound in air wz-1v l4p(iqj7o bv:xw9u fs1is

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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 zv6 wb*p 1ucyym/-8wicalled

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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 thzvj8tc7346 s,u c:-gjr idgasij 5)hfan 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 directio 0rmcs d u1bqvtn z+eh:5zq+1(ns. If you move to a point twice 5 z m st1u0b1:vhcq+de(rn q+zas 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 proportionjkxa(qa1: 8yo al 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 distancezkl9t w*)tj4 k;;00pnbmpo nw d from the source is I. What is the i)4npkjn twm k;9t;0b lowz*p 0ntensity 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 distanc3fyr 2eqlm59 ee from a sound source that is radiating equally in all directions. fyem59re3 l2q 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 distancy 6t5u/0 e/ wtugq jiuny92sm3e from a sound source that is radiating equally in all dire0iujns9wgq /y23t /5euu tym 6ctions. 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 increases as a sound be3 s5 ly07qtv3h-b *c ml e6ovvtez(1afcomes 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 rm-g:0* xh1bxsg,xg f speaker emitting a pure tone. What characteristic of the soun- :mx1bfg*x0 gxhsr, gd increases?

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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 strwemgyinm3 pwv/z 266 /8 a1note?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pit 6/+bm*4gyt- 7wfnklyoch yv4ch" 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,v :at )ltvpam 1h*k5xi cdf.. 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 wavj1wnb6/-jecta4 xuv o:2vm:pes 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 8+l2 )x.k srkzz7nz fh qm: a23drw3ogstring and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in ck gr f xzawdn83z:k )zos .q2r2h3+l7mommon?

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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 whi 0e2ko,by0zgkqb (.njb7xuj *ch is 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 wavelengths of the three lowestvqt 0tii6 *c ouw)z33qiv(ye 8 tones produced by th6e*o(qv3c)iyu z iqivt83 w0tis 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 lqpdit) +s-un/ e.t67e(bmu 5 6 cydjxaength L is 200 Hz. Which one of the following frequencies will not resonauje/t+6xu6 dn dcqt(7- ae.5 m sbiy)pte 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 fundament:cey1oa ) we3ral frequency. Which state)oy ee13a wr:cment 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 otherh kmg(mi6*v9b1oxx* y , 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 ar5hf 4z ;-m 1onofd.vlke the wavelengths of the three lowest tones produced by this pi51f;o -kdo vzmnlfh4. pe?

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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. Whqkkuf 90gc fk4p 10i.6dl rc96)qonuhich of the following frequeuh09u6kq)96pf gqc4 0n l crko.difk1 ncies 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 cqot :.xp b.hfir hn70 uz,;ln4j9m8bii;,gztlosed at one end is resonating at its fundamental frequency. Which statement is corr;iuih70o, l b; n. 4n9h.mrttf:q,b pzj z8gxiect?

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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. Eachlpb gn mc)le6:r5 ol, o2mv1)l speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. Tlollvmpe) n :, 2lm5gb rc6)1ohe 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 su;sl:p j f,,t+i day/oound 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 sounnrfsb /,h3 v7kded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased7sr/b k,nvf3 h?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift expluik)n z06m wwc 7q8.eql *mws3ains

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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 stationarypz - v+l+p frhye2) /giml0c8k observer. The frequency heard by the obs+rpim/)0fl veklp2zy-8hc +gerver 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 freq zy xp*j(e:kcv27mk472bt0 n yw 7jddsuency heard by the observer is2pz2bjxjd wy:s k0mv (e* n 74ytkc77d

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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-speb (g81:6 0vic px d4ao-thpkoied, its half-angle will decrease by a factor of4b- 0:6xvia8p phk( got dc1io:

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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/;w nuljyl9utmt :0 .alyo 4pctk1(;1bs. What is the air temperaturb 4k1m;y ;puctn0ly. wut1jt:l( aol9e?

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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 aifk*o8q (yktc+7r ,o wtr 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 v9c*di w.6 ii:k+rsp5 l-bzdb sound in air is 340 m/s, a bat emits a shriek whose echo reacheddivb5wii p:+ks-l .c r b*6z9s it 0.0250 s later. How far 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 hearrlh /p/76xpak 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 after seeing a flash of lightning, q/7wf g u6 vs3vx v)4wivt,0kathe distance to the lightning fvq37wvw0i gx kt4 6 )uvvsa,/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 cliff on a day the tempec,w9px f rijip -b09l+0 se/msrature 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 welsl n2q:u7ha t0zxlxb4n 4m(1sl and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assum ( 1 44bu7x2ls:hxnlzs0amnqte 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 of frequency 500 Hz it,gn6iry( 7ls s

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in aqb*(wtf7 il-aci l2h 5a pez61ir 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 a *p1w*q7yi oiu3wrxn8 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-d8 un 8*dtthze++)mwuc6e g -ceB 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 wi-braa q+gnol.q/q)k+5 dvc/nth intensity levels of 70 dB and 40 dBgaadvnc 5bn k q).-qr l/qo++/?

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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 qc/lidc:uxk2 l091ix 100 dB. What is the intensity level gli10xc: ldc/uq9 ixk2 enerated 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 from a source that is radiating e p dyql73b,:zbny(j 5wyn42sxqually in all directi dy(xy npwl sn3z,qj7y2 bb5:4ons 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.adpf,* 80x,1 5sgnb bs2rumb z0 m from a source that is radiating equally in all directiobd,u* 5mb rx0f apbnssg 182,zns 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 abouf nm3wbn9/cp-y.f)umt 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a d m. mf3)/nu9ncp-f ywbistance 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 ayf b7 j ylbc3 e3uv bwmbeu)..iey),7/ barking dog. What would be the intensity level if two identical dogs very close to elbeub3ifjwy.v y .cu)7ey7/b3m e ),bach 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,5cdyp xky h orkx6k*/q-4m f- source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m fdkkmxhp5 qrx -k*/o4 ycy-f, 6rom 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 aems 58fig;a* h point source is 95 dB. At what distance will it be 785af; m*sh eig5 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 1n .a.nq40 jzf32-yfn8 eqomfw200 Hz. What is the frequency of the fourth harmon3znq. 84wnfo.ymqe a2nf-f j 0ic?

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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 the cw 6ds wj5c,uhnc8*t*length 8nc5 **h sdw,c6jtcwuof 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 H2jxo2*vuh,fi:cxsv 3 z. What is the frequencuihxfcs,x o*22v:v j3y of the lowest tone that 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 veloj1 -7bq8lk6yq;2u 79 otiurlybz-f upcity of sound in air is 340 m/s,qt1p7yy6z i; lub u-7k9bq8 2jflo -ur 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 r) egofqh 2fp7bkg6vq1)bz7h8oom 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 closed a+-3 k1gg4vk jyjq*b:cgi a)qf t one end is 330 Hz. What is the frequency of thj qba-ickgk+ g1 : yfjv3)*gq4e 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 closzc;qjntj x)ym5h/ -t,ed on one end that will have a fundamentanqy 5mzjh )xt ,;c-j/tl 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 ru*; z5l1rf49 dkg dqc:dkfby9oom 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 rot016lkbmy(sk om 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 i)22msg n.6 qakzstb) an air is 340 m/s. What is the fundamental frequen n .s)a)2ksab62gmqt zcy?

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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 t0gmhfk 4s /:cjhe same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the ff40smj:k /chg undamental 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 w4q. xv.(om((; p v 1*idorrtajvznpa2here the velocity of sound is 340 m/s. How much farther back w1oz2q (tv4d pman. ;.xirpoa( v*j v(rould 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 sa+x (nnen(yc 7ume frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no cxynn (7n+ue (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. Whamp3em 3:kytmzra(6s1 omkx(*t 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 ofrfi75- bowy0 y a musical instrument. If the tuner hears a beat frequency of 2 Hz, wri 07f-bywo5y hat is the 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 sounds produced by two lj:il:lqc4y fl;y+g 8)wqs* a 0t7kllhorns are 6 m and 7 m respectively. What beat frequency is heard when the horns are :wl:cq8ga 7js;lq l0i)l * 4+lkfyyltsounded 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 violinmttt.vpg5jq6 v8/9p t strings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency/p 5qv m9tttgjt.p68v 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 1000-Hz sound source at .va k9hp( e-,nj -rhretwice the speed of sou(ah h 9rervpj,enk.-- nd. 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 frequency of 1000 Hz) approaches ax.js4 nu63gve4, th cf stationary observer at one-half the speed of sound. The obs3 cfx4unsej ,.4 6gthverver 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 vsbe4r w,v2y5moves with a speed of 30 m/s away from the ssr4,2yve 5vwb ource, 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 zsaqouo707othd1y9)x : . abtyaa2t; when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing alh7 :)x09z .uot1dyottysa7;baaa o q 2ong 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 train appr9+/xcn07ci;zbwn a ta9+zx t1t sr3 7xln-nlz oaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and nxt saacx7 nt;n b71tl+z/l+3r c 0xwi9 z-n9zthe 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 40j33okmi/fzx:; pw1m8iwk(an bt r z88 0-Hz whistle. Take the speed of sound to be 340 m/s. What frequenmn81kz8; fpm3kz3:btwiox8 (/wj ria cy 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 sh208 +przihdtoward a stationary train. The train blows its 400-Hz whistle. Take the speed ofh pi+zrd0hs 82 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 awn 4xszvf x ab;s63p kp;9(-glqay from you at 120 km/h. The train blows its 400-Hz whisap6;gzxxb p 4 qn(lfk9-;vss 3tle. Take 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 itmgc(pze a0o/ 1d w3.acs whistle, and you hear a tone of 400 cezamdao (pc1g/0.3wHz. Take the speed of sound 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 -bru949s z42dyl4 dg v ;c5d pt3adsjrthe speed of sound in air is 340 m/s. What is the frequency heard by an observer ifd;t4 j pdacrzdvb3ldsys9gr94 -524u 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 ib)g 2 e**pzflgs 500 Hz. Assume the speed of sound in air is 340 m/spfg )z*bgl2*e . What is the frequency heard by an observer if the 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 lkjy iu :5kw,- nngg31speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast isi ,j 1 ywk-3u5nkg:lng 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 iy -c 2s oh (jfs8ee.h zh0z:ckkk5:wt)s $60^{\circ}$. 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-dw0m :sk (ao7 szbdj-a8pt 8h. What is the half-angle of the conical shock wa70 -k88sjapahob :swtz-d dm(ve 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 States to Europe wh+(m z8(k) sp zpes0akj,fk:x ith a Mach number of 1.05 where the air temperature)jezx skszpa:,kk ((8+hm f0p is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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