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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 followiip(sca -e3n6xxqsro, 7yxh1 :ng 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 tho+lwe*e (k 1bic)8;qdagzyg*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 3/gp. eh;tt ldsound in a steel 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 incr qaql.y,4r.*xlc /rlkvz h45j eases, what happens to the velocity of sound? (Assume that all otherq4r*y/.l,5c lj. alk4zvrhqx 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-jr,csl 7w+e3e0j*osx ses s 6 a 400 Hz sound, the velocity of a 200 Hz sound through es7s ,l ej0s*x 3ewro-6+scsjair 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 acce au1rtawnz 0* ,k2- 400 Hz sound, the wavelength of a 200 Hz sound in air1*ew-tr,0zukn2cc aa 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 vpurv/k7pa1l;tqx *o)m5aw vnk)xpj a.:6 s 7frequencies 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 frequenmhp2r .knkf -3b2whuiv+op*4 cy 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 emitt60*w gw d5.thi32t9tzw98a sjdx uwrjing waves uniformly in all directions. If you move to a point tw0hw w3rawzt9 gi8 j*t9d. tu2djsx65wice 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, intensi ;nyrt xgd1g54ty 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 is I. What 8s j p3il,*uhgis the intensity at al, g8ip ujhs3* 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 is radw1hoha/6 ) zng3-fo jjiating equally in all directions. What happens to the intensity o n 6/j )-1zhfgwh3aojof 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 fr0mq2x(;z6 kww/3mkegl; tr9t zfw 2 elom a sound source that is radiating equally in all directions. What happens to the intr2;t gmwzzm e 20;3tfe w(w6/ llk9qxkensity 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 followi (q; -8dypvk rwc9gtb6ng increases 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 psb1lw7w; wmtd i xdce8(wy1 23ure tone. What characteristic of theysw1w1xed;wc( 7t wdl28 m b3i sound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnes ke,klw1l q1dd8w.11k ky 1b18v npmrfs" 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 nmil(ts* qt *7sote?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes fromi1fbsjy+x 1s ( 0.mwbh 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 ;zfp)5 mzxxly;/o ywg9,rt i4are

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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 tq. :.sdry 2 qvjn)vd.0 l1qkjr6 fka1generated by the guitar as a result of this vibralj.dvj0fk :62q).y rq1q1n.t sv adrk tion. 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 openrj 4jxtw04 l.fcgg *f( 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 lenpq: )0a qcy( w)6apv;cxqrws/gth L. What are the wavelengths of the three lowest t)pv/rw (aq w:aypq;x cs qc06)ones produced 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 length L is 200 Hz. Which one oa95ezzn(lcm c:);e (j8yfw esf the following freque( )cf9 czaej;e 8nmw(z: syle5ncies 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. yitt gfs9g;n(t vz8)6 Which statement is8gz t;gtfv6ty s)in9( 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 cgdu 0ah )1st e5zk:9aylosed 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 wavelengthsmn35u7x 8gq8bu6w lnn of the three lowest tones produced by this 5n ubnx7mu 68 lgwnq38pipe?

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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 resonaljhjo7:wwde2. 5mh w:te in a closed pipe of length L is 200 Hz. Which of the followijhw:j.w:25led o7hmw ng 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 resonatit16z6 fvpgvb565g,c qy.r bvtfs 87ngng at its fundamental frequency. Whicczfb .ng, 6pqv7 yfv8st1bg5g 6r56 vth statement 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 drivuvab7 3a5p6 m0k;pj znen by the same source. Each speaker produces a tone with a frequency of 200 Hz onk;n0uz aa5 36jp7vmpb 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 waves sho65 f p/uo*abicj8ev(nuld 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. ).:gdr pnba.k What happens to the beat frequency if the frequency of one of p.ra:. d) gkbnthe 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 ex aoo;7n+o5);fbt6pnvzuc6+hncvh4 q plains

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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 th /0wq4dh2g k/ +md6xvb- dag5igap/abe observer 6p04 kg /xgwa+/25qgddmahav/bdib -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 frequency c)caa45-x6mi-qux p ahsv*n; oc22zgheard by the observ2 scvc ag-o4cia-q;u* m)x52 n6hx zaper 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 dbvbd.a/;8 -ehnqws.+9riv ; m-ua4d dij f7wxecrease by a fw 4u9erhjdf s./.vbvx-+i 7d; iqwd - ;8maabnactor 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/s. What is5pav+,.i o lv2/s luyf the air temperaturu lv,.a5 f2ip+sl/vyo e?

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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 sou 0eauese0o4si*+s fq;fnc x/9nd 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 emits a shriek whose o-lm *xmhqbq;,0p c (gecho reaches it 0.0250 s later.loq(bmg -0 c; x*p,mqh 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 hear the echo in 4.00 s. The temperature irz v(sr bz0hc5w.8 x-ys $0 \; ^{\circ}C$. 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 sjqvpefw 1b u1kxvqq 9 frv7+0-p;8-t:a z) fmweeing a flash of lightning, the distance to the lightni9w fv+u)x8 b1q;q -e0v -f17wkfa zv:p tjqmrpng 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 fro4 p-qzps01hn otw/ ,kym a cliff 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 lf5w iy/,-1bn j-bwz vdeep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistaz 5i-nb/v,wyj-1 f wlbnce, 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 sou,hm (pag4zx hyh fn258nd 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 at;wm7n xalrr-uu(k4 3tzoq); w $23 \; ^{\circ}C$ 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 with intensity em*7hyik y4, ng w)5u asr27by$10^{-3} \; W/m^{2}$?

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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 soun0 mvhum ca(*jrhb5vr;g e 22o0d?

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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 sfxw3fcw0-vvypl *y) 9ounds with intensity levels of 70 dB and 40 vv f0f cw*) ypl93-wyxdB?

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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 is88 ohyxyu e-j: the intensity level generated by oh y8uox8:j-y ene 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 s 0y- :6ghjkpfs01ovlfource that is radiating equally in all directios:jkp 10vfl h06g- yofns 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 sourceohn nbya90fe(va2/ 0l that is radiating equally in all v2bay9a e0fh(lon/ 0ndirections 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 about0jgl lx)s 3dk71rl 5ta 1 mW of power, which is assumed to be uniformly distributed in 5tdl1j3ga)70k xlrslall directions. 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 b8; m;cb vvd-qs8 4k trvjn3t 98xkqmb/arking dog. What would be the intensity level if two identica;;4x 9sb vtkm/q8t8c m-nv 8jvkr qd3bl dogs very 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 sozzqtl: )0v4: x k:nvac3olx,b urce the intensity level is 60 dB. What is the intensity level (in dB) at a pointboqtxv :k :lvl0, )a zx4:3ncz 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 wha:0.ayffjxdu2laq 3 c2 t distance will ifdfj0yl 3acau2x.q:2t 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 of5+itb 2p)xac+wq55kw * dlou+3nu cso a complex tone has a frequency of 1200 Hz. What is the frequency of the fourth ino 2*wp 5s b ud)c+a5cokuw+5 tl3x+qharmonic?

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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 g*rrfh*t ,lsor49mrny(t+gv6 2, hpz length of the pipe?l* +gr,r9fz2prh y h,sr(tgvnt4m*6 o

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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 lengx*:lwq+xq q:eq (8kd1 qrvt6ath L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length+tra1lx q6 ed8 qq*qq w:v(kx: 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 lengthftm(-sj na :3g of 0.80 m. If the velocity of sound in air is 340 m/s, what is the freque :3f (snmta-gjncy 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 rooa awkn5a4p 2y2m 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 pibd0iyvn75l :qoqt . ;upe closed at one end is 330 Hz. What is the frequency of tq i.ld0vb: ;oq7uy5tnhe 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 e0ft sep j31c1znd that will have a fundamental frequency of 60 Hz on a day when the velocit sj0ez 3fp11tcy 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 tempeufi 1,t9 9 iegsd/5xzrrature 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 whej d/b ,+q85brxqy -un dmtm1,ryahd6sj22rl 2re 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 qn muj(1)g-qf 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundauq)(j1qn-mgf mental 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 sadz o.xw/f161wai f8aw u6n/n sme length: one is open and the other is closed on one end. If the fundamental /a wo6u6/idxaf.nfsn8 w1w1z 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 where the velocitfu5 2hntgrfdd3rfn .: j* )ewr331sgny of 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 s uf3j) wg 1th3rgsr:e f*.ddrn32 5nnfound?

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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 sid.l b 4cd s6k86a 9vkl4hi oi7wu49mxkge by side and driven by the same frequency 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 speed is 9bvgk .6xuwl 64k9c4a idm 4slh7 oik8340 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 frequencieslt/cbxlc 93+r 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 le9,qhvqj6 kt +5ng+ mtuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of 6q teh+,g9lq+knm vj 5the 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 * gbvz*y/ 45bt4j uys z6rf*mjsd*:duproduced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the h* v6*jzfjbrb dd s:5 s*y muzyg/ut*44orns 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 v4)5e3mk+2 ugrya4 sqnwj80h q r efd7an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentf4g dqv42k+3 7qr )mny05ehe8rj wuasage 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 approachxz pvcl+8z9a0i u5q r-sicq.rn,dp4:es a stationary 1000-Hz sound source at twice the speed of sor-c9qrs u5cniaz. p4liz pq,8 0vx +d:und. 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) app96j d: *nuu 7zmw*osmg kppl(9roaches a stationary observer at one-half the speed of sound. The observe (p u69**:opl9u kw7 dmmnzgjsr 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 moves with a speedz b0k q.mtwnhilp7 ;a2 kt479n of 30 m/s away from the source, what is the frequency heard by the obse. ma4n 709kinqt wb;2phtkl7zrver? (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 i.zs1kwdnyjswt53 8*3n2 e7z e*hdd c 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 roadside. What c*8 hed *w5ntzje3sd . kwi2y3czdsn71hange 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/opm,yi/f i0x m6x+ct y :/ero heard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of6 xypxoi:/ fio 0,te/y/mcr+m 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. 3.yo69 p zvqwc The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. 6v 3 pow.yq9cz 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 g6pomxs)w ). t400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you h mp.os w)x6g)tear?

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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. The train blows its 4ud ;g eg t.uh16igib8300-Hz whish bu.6 gd13tiig 8geu;tle. 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 kv7tcu v7:a5kw5hy v 3nm/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What 37v vhny5w vtk5 ca:u7is 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 the speed of sound in air is py229j++iz1ft )qt casgdox2 izs;i-340 m/s. Whagxzp ;sc)sz1if2ia+d+ 2oq 2tyj-9tit 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 6u ,xeev0nl)v horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observv0n vxu,6)leeer 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 speed of a t ybq u;g/rk.+z4p8sdn object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. k gpq.t8;/ 4+z rubysdAssume 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 t*du6swwk ) hbr9+o ; s0yv/vunqk)8ff 0nx6qby 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 is the half-aigx+mde d,:6y ngle of the conical shock wave ,xdgyd6+e im: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 Ui: noy;kblt.npa e*,f 87gn;rnited States to Europe with a Mach number of 1..* ;g8nl7ft;pn:abkr ien yo,05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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