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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://tiku.one/test70.html
 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 followingj-v7 bil:f( uswjd7h 3hpg :w5 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 con)lip+fc .hm 2rducted 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 soundq/5f 3spzb7om wb( (de 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 increases, what happens to the velocity of sound?n0t -ujz9 p7an (Assume that all other factors rem7n apu90jn -ztain 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 z w r+1a;s,j(hdbl+uh 400 Hz sound, the velocity of a 200 Hz sound through airuz+1 (bhjlaw+h,rsd ; 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 200 Hz sound+ q - m4nkxjrxty/s::g in airs m+qtr gxk/nx: -:jy4 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 20,000 Hz are calle.nzy5 twl h7dpu/3c dry63.qb d

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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 20 g*3;xg5be-xdcv*j 9qlm1k 1m rq *iayHz 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 oy vny4 5ku lod ak-l+5,qu1q4waves uniformly in all directions. If you move to a point twice as far away fr a,o5q5k +1lk-ul4nvd q4uyoy om 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 divergin+ q3(u)ep x; t8rpcqz a u:qww75(vnrpg 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 .v4kbfei*s nr:8 b u5 3-xqdzusource at a distance d from the source is I. What is the intensiuk-dv4zq.s xn 3:bu8r ib5 e*fty 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 .b)v .hq(7gzbyyt4f 5nvc2 h0wo jg+bfrom a sound source that is radiating equally in all directions. What hapghbvw y.(.vbfjtg52n 0h4y7+q)c bzopens 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( nh6tk nln3e* from a sound source that is radiating equally in all directions. What happens to the intensity level on*(tenn3 k6 hlf 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 in )d/bsbvc+-g ocreases 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/ z2s.o*zug zgstic of the sound increas*z/u2.s z gzgoes?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudne4lqmh8.qjsv1) rl nna*3t a)vss" 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 a6onphi /f *kw( 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 wat/05 xbrw6 xh sizamy/ej)4fk9er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displac(b xayxqz k6 **yu)ejyc3gu089lng:y ement 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 on a guitar string and the sound -gmm, f.cde*d wave generated by the guitar as a result of this vibrd -fd ge.m*,mcation. 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 qet 2wv(9plj.j hu41rends, 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 0/x)s 1,v xtqzcmzoq8 lowest tones pr0c/s tq81,x)zxmz vqooduced 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 pipgumfm 2v;1 d3se of length L is 200 Hz. Which one of tusmdv12;g fm3 he following frequencies 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 fundamentalpwcy ,l8xe03jv5z vg4 .b/ (enbq0h py frequency. Which statement is corb, he08gb/qyjvcl3w0( ey zx 4vp. np5rect?

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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 knxo ,e/; 6hjgother, 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 wavelkkw; w,6c6h zhengths of the three lowest tones produced by z, kh6w;c6hkwthis 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 closoi: y.wt; r tn(sf8kh0ed pipe of length L is 200 Hz. Which of the fon(8or;kwh tfist:0. y llowing 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 resonating at its fundamenta1-wa 7zqieolmkwk0 an,s6b:0 l frequency. Which statement is col6ia s:nkkb ew01awz o-,0m7qrrect?

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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 sbwcb g:k+ 9q).6fc sxyame source. Each speaker produces a tone with a fr6x+ kb)cqs bgf:w.yc9equency 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 waves u48,lod .si -no7(vanaih8xdshould 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 parmgpf6 di*dl9 h0;up y.x cq.b8-dyvd1ha91rcticular beat frequency is heard. What happens to the beat frequency if the frequxd q-96 alh1pvcypu g dybd.mh1r980df.;*icency 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 expl+1gx ;zqh 3ihpmb7xurip 70 *uains

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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 onzr r;m*15+poet mzr wx8g+m xey59z ,bspn* +;wy+9otmemx 15 rgz re8,x5zzrm erver 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 sta/qgof6o ea b:i0p9g3(lmik l :tionary observer. The frequency heard by the observ :6koqbgel9/mgap (oi i:0lf3er 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 decrn5tea tni3)1h7 zvp+ zease by a factor of azetv+i71p53nhn )tz :

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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 ultrasonicj9-bi oz4n-lbreuh 2gj ;,*yi sound of frequency 45 kHz in air is 352 m/s. What is the air t,2nzj - - ou*y 4jbi9hb;gleriemperature?

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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 aup5/mg dmwm- 0jhmv)ma)7b a7ir 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/h*wf*/p ij/g u9k/xiws, a bat emits a shriek whose e f9wi/iu/jp/* w*hk xgcho reaches 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 hear 9dl,x,1z ef- rnf se.bthe 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, thegn4*y ii4d 5vp distance to the*d4ygv5 iinp 4 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 cliff jl lyvwm.uj 80f;*ow;f6aizvna8q/1on 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 aobd vn,pp 5f+; deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume;o,+ pvdbp n5f 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 4za wy5czh;uip*i a,5wave 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 a6g s3*j-.qj7( s9cuy3ya 0layly-fta c dmn,ct $23 \; ^{\circ}C$ 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 levelt bmu5wmm8 flh4yto ,t3)0*el of a 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 oeqo9wi9 gsr(+4y8cp70-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 intensiti-wq .j +:f9u n;eacnnwes of two sounds with intensity levels of 70 dB and 40 d.:q wfu jae -wnn9;n+cB?

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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 th:6klv3hj0. o.ck(hbb ( inlxfe intensity level generated by one e0 hxo6 3k. lbk fl(j.(icnb:hvngine?

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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 vt rjav3,t948r: qdedequally in alldd8,r vqv9j4tr:eta3 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 -v05 ugj -2qzsj fio s6ivi5*kgkcq 476.0 m from a source that is radiating equally in all d0 c7z5fsq4jo 5 giuq*sg kjv6iikv-2 -irections 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 akz tds0e.cbby/ +s;gq.( 0zewssumed to be uniformly distributed in all directions. What i .gb bszqec00;+( y.wetz/skd s 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 k t-q:(lzn ej ; cl-+r-bi*qmobarking dog. What would be the intensity level if t-n+i;t:lo( lk-b j-qr qzc*em wo identical 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 source the intensity level is 60 dB. Wha ko* /)q1/zq s,ctmz+ b0fepcot is the intensity level (i/kfpc/z+e, q0cbtqoszm *)o1 n dB) at a point 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 levelz ,v9yj5 iw:8toxiyfm 55o5nu 5.0 m from a point source is 95 dB. At what distance will it be 75 d5i,:j vyzt8ooi5 mw 5n u5y9xfB?

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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 wgfh. 79w2ho sof 1200 Hz. What is the frg2hwf. sh7wo 9equency of the fourth 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 thir9nm2x2ubf j; ed harmonic of an open pipe is 900 Hz. What is the length of the pipe?fjn; exb2m 9u2

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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 r/4dl (v2hp j5f5jm7xgrh o ih5esonate in an open pipe of length L is 400 Hz. What is the frequency od/gp54o 5mj 5 ri7jhhv h2xl(ff 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 lenggv26z9ehy 4sh7yvvj ; th of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmo 6;h2vhy evzs4g7y v9jnic?

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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 icj: 9s//nt cdds in a room 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 at one end is 330 Hz. he+vql(b:o4gz9yp2wl- jtf* What is the frequency of the third hl- 2 9hp(qyjvzb* ft:elgo+4warmonic?

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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 piht0 -x:mqv nz7pe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity otm: -q 07hzxnvf 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 r)8r 5uapgkjg 9 :7vfwvsx*i0f oom 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-k/ q2rr8mg mqs4 ymsce;l:s3 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 thy 3t+dfd.v7xw e speed of sound in air is 340 m/s. What is the fdvwd . fx3ty+7undamental 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(v;yi 88 tiiv lrd606j. gpjjn and the other is closed on one end. If the fundamental frequency of the open pipe is 30 tl;jp 6j8igji0 n8ri6.y vv(d0 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 frc8a0-h(j 2o )+wl pi ,asqxdsmequency of 800 Hz in air where the velocity of sound is 340 m/s. Ho)j, -8 id2sosl(qpmh xc+a aw0w 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 samexbqs* o+l4m:1py axu8 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 3 8q+*aux: syobmlpx1 440 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 v40cy*esru)rt4 x8fc 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 uk2wyuafj(c m -q1vi e:o*nwj),w/fjq7/u2v tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency )wjqwak 2i 7/cvv j/uu1-:mwen,ofq(f* ju y2of 2 Hz, what 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 msv bfuew.w 8*i )6bk0horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the ve bsm*)w vb6wk8ue. fi0locity 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 found to pro3/y ah lssw-77e*nddoe 1es r*duce a beat frequency of 2 Hz**esw 1-l saey3 d7n7ed hrso/ when a frequency 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-H47s2 qe5o 4nuleavn8 cz sound source at twice the speed of sound. The observer hears a frvnu7 s8ca 2eon e544lqequency 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 10yln ai s, 2c;;3mlcro200 Hz) approaches a stationary observer at one-half t;c32mo ca,rs ; nly2lihe speed of sound. 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 listener moves with a n:-y yr.duyaedr2r/e- w8o ( sspeed of 30 m/s away from the source y8a/es ro(y r-du.de:rn w2-y, 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 ajyuc5p;- p u2yt 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standingp;yu5 c2ypu -j 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 ayqotr;l :/.d(q0khy when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and thdyaqo(0.;/ yr tlqk :he 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 1ug;xakumrngexw( mr-2 825/f20 km/h. The train blows its 400-Hz whistle. Take the speed of sound to b( /-a n;mwgru25f kgeruxm2x 8e 340 m/s. 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-iyfu)x/ x7v h stationary train. The train blows its 400-Hz whistle. Ta-fxh x 7ui)y/vke 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. The train b4 cdar5v*n/ i*cwz7lo3 c y)wllows its 400-Hz whistle. Take the spe5alocw7nv y34crzl)/ * iw*dc ed 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 its whistle, aniv6b a.1 9 t)ezaq0ybtd you hear a tone of 400 Hz. Tab)t.1aa tbv zi6y09eqke 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 Hzg+n 9x0- -zicnucm d2c. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observeg-cncmixun +dz2-09 cr 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 is 500 Hz. Assume the speed of sound in ai3:v;.ta en crqj *x)x7ohx*bo6z/jzs r is 340 m/s. What is the frequenxaeno hq /j7 .*r*sx:zcz; )t6bjxo3v cy 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 speed of an object. v;boxv9;fz;t rxi2p8 (n*b9p ihu1xo A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/;rbz(i xv 1fubxniop;9tov2 p 9;x *8hs. 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 the1t f,ygs0md 1n conical shock wave produced by 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-angle of th (d wkz2p: (ari/pvs;ce conical shock wave formwcp;:zi( 2r d p/(vskaed?

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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 3m v/+iez1e)uceo7-d in0d xmthe United States to Europe with a Mach number of 1.05 where the air temperatui )d13o -/e7euxm eicdn0vz+ mre is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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