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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)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://51fly.win/test70.html
 作者: physics  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 statementzmra38f gg q*)?

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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 thr 5lcn8 ;ljenpwdv: ;.wough

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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 so/5klg19ym su ktx(nn1cn:7 j3ehcu m:und 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 f9, /vua3mru( k a00ysqe;x,njswxj a,:ig:chappens to the velocity of sound? r k9 w:mv0jyieq: ,(a,3u xuc/f,sj0; axgnsa (Assume 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 velocit+ l9+pkdcu n+ee7q1 cry of a 400 Hz sound, the velocity of a 200 Hz sound through air i9+rcpkc+ dleq 71neu+s

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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 waveleng-4 im mgl3i-2fjhclp(th of a 200 Hz sound in alglhc4jm -(3p-2 iifm ir 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 greater6*5b -zbkw*zlbu9fsd. cuqs; 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 frequency less than 20 Hz a/qc(b6b zcn3mrl+nk22i k dyp:kn04lre 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 dirxqb3 58w-vscm.kw +ydections. If you q+3dsxwvm8wck y5b -.move to a 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 proportionakac7umy.v)) vfri9 /2k x1p kcl 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 t3ub v)8 ;f swjb:kcf-khe source is I. What is the intensity at a dikvcusfk;w8 )f-bb : j3stance 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 fths l-+a-; d6nun o/fndh/(xfrom a sound source that is radiating equally in all directions. What happens to the intensity (//hun;+6lsnd --f ofda htnxof 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 a sound source that is clya8+,x *k;wzv, zu cradiating equally in all directions. What happens to the intensity level of the sound? It ,al c+w*yxz ;,8 kcuvzdrops 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 becxq.rs) 0jq9grv6mgt)omes 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 characterw q0+7 n4xdjb /e kxtjacq0j,/s.fom /istic of the sound increase/0sa +m qqjw/nfdx ,/x.4 t cjj7bo0eks?

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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 musicaap :w7c;72xzf d3cou-xw +i tae81vqf l 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 zo1 h9s)aqcw+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 airnbj vqw6,4;b/yqav 7 n g,x3uj 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 wavi*pt/r nn7h9 vga,bte9g5p b k(0jqo+es 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 generated by g0uvquu bqcf403v)k47log 4ea i) 9qrthe guitar as a result of 4vuo qq e4iqg3)0 uck f4)9u7gvlab r0this 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 end k6bhc6n+r v n3*bpu.xs, 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 thrf.q g .;)8b1pwwdekcr ee lowest tones produced by this pipe?;ew)dwp.8f qrgkb1. c

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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. Whhwxw p9 2(gct9ich one of the following frequencies will not resonate in the t 9(cxhpw2g w9same 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 frequen8:pl /x.q fc3 nlm7ywrcy. Which statement is cqx7 lrpy /83lw:mf.ncorrect?

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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)4 .hdlvc 5g/gc :wpy vybh9 rop)e3)vp +/fpx which 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 thy c 3::)f9ckbkij ;pjpe three lowest tones produced by this pipe? cjcp9k b3fy k)i;j:p:

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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 reson;f p k17qhdn*vate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not rekq vdn;p1f*7h sonate 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 fundamental frequencq*c2m a2w;vxky. Which statement isa2x*ckvwq;m 2 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 theo+px4nila )+v same source. Each speaker producex +ip)4 l+navos a tone 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 em/nyxh q*o x-ye u6()sound 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 sounded together and a partic l,y n,uvnnq(k.*oo fz-e,8rxular beat frequency is heard. What happens to the beat frequency if the frequency of one of thk,rn,v o f,yqnnul-8*xo(. ez e 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 explainsax* t8qq 1i2co

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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 obsex7 562qy hljnirver. The frequency heard by the obserq5hi2jn76 xy lver 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 observerwa i+: mz/pf4hrk/im0 . The frequency heard by the observer+ra/z: /pm4k i mif0wh 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 idqlk3j8pv 7p8n5baufxs ,*l1ts MACH-speed, its half-angle will decrease by a factor of: f 881kla7npj l3xbv*duqs,5p

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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 w,obat3xte )ka71 w tvdj0:ip .dr/+ vair is 352 m/s. What is the air temperajapwtbekrd0v /t3ia ,wv:d1tx.o)7+ture?

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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 air .rjo 3r7heh627 gqm8 hd pwhn4at $0 \; ^{\circ}C$ 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 emitsqfx kf97 tr4/cw6 8wcq a shriek whose echo reaches it 0.0250 s later. How far away was /tc r4 ff8 kqc76ww9xqthe 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 ecwiswa9+ d*i w+ho 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, the distance3dgt vo )2ewk) to the lightni3egk))w ovd 2tng 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 frombwvi pr9ez)n560vz* i 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 intm mi..5u p8:wp:icrjz:iyxt6 o a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocitxzimy58j : ir 6m:.pit. cp:uwy 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 frehd;sj3 9gx ,g8uufqn7 quency 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 at00-wp19z01rhdk7ji pli n yair 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 sourmrs;dncpw7 r)+ 3/bhnd 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-d kvib+ wr0+ sh./bt;osB 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 i( mzdg1o t;twroqp+;: ntensities of two sounds with intensity levels of 70 dB andmt:ztog+od(wr q;; 1p 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 b)1*fw ahz ju8phdsyi 5 .rc8s:ni2)cdy 15 engines in a garage is 100 dB. What is the intensity level generated by oneicsd)y*2i5 8rw:.u 8ph j)fzc 1anshd 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 ,o+mqiao aw:q 5l2/bq m from a source that is radiating equally in all directions iow ,m/ol:ba2q 5aqqi+ s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 s :n+ptvzu mpl+qy+f6u2bx w g6jl 8/y3ource that is radiating equally in all diretj6ulnqfpmg ywpxl6z28/ yuvb + 3+ +:ctions 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 assumed to b,xlm 3inf- *yld)zr 3eakl z(.e uniformly distributed in all directions. What is the intensity level at a distancefm.izx e) da3 3r(n,-llly *kz 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 barking dog. What woc)n w;y5 sue1auld be the intensity level if two identical dogs very close to each ote;)was 5cynu1 her 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 souohbdodmt(14 3rce the intensity level is 60 dB. What is the intensity level (in dB) at a point 4othdom3(1bd 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 u0 krmsig j811from a point source is 95 dB. At what distance will it be 75 dBu8k ijs 0g1mr1?

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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 comi 8.up i0ab:o0j;6awgm.oicmplex tone has a frequency of 1200 Hz. What is the frequency of the fou ip0iojag .o0 m:86a;.cmwub irth 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 thirdr n,2ee3(- cfdd,e9u r mxg,2l5uirqr harmonic of an open pipe is 900 Hz. What is the length of the pipe2(d,x,uqre 2drgrne -u l3fm, 9re 5ic?

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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 Hz. What is iw-:c)vzny;zo cdi( +the frequency of the lowest toidwo-c z:nzy+ ;(ic)vne 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 768r :xgqrg g/mvgm*g both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency ofr * v/6:gm8g qgg7xgrm 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 rpkizqwj p7l u:4+mis ,*b;e4boom 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 onelz.);mybzl5; y8ghkce- /r;b e .itfa end is 330 Hz. What is the frequency of;lka/bfz )ce.i-m; .;g5 b8rle y ztyh 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 have 7)ff b yp7:o bzpywr:1,rb5pnr hk5:ya fundamental frequency of 60 Hz on a day when the ,nyyrr b 5)p5:zo rw:bkpff pb7:7y1hvelocity 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 thej1 7mv w0a oak(zq8m3erzr 2;hd5k*qj 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 whereoju* lj17(mfd 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 0.7ab);gpq:k a z+5 m is played when the speed of sound in air is 340 m/s. What is the fundamental frequencyqagzp:;) a+ kb?

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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 )6k rujie5,-wgih ny91j2dao the 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 oe2krn ,ij-)a5y61uiwjdg9h 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 velocity oh*u*ysci5 i,dvj-sr6n- fue 9f 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 c*isirn yd6e hs5f, u u9vj-*-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)kgl3 ,8- unubev*hpj by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects litt3-ep*8nvjuk g), ub hlle or no 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 H1qwzlm7** 6i pqa+ojhg./a wuz 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 tuning fork to tune the frequency of a m/yuobjg e/)lq p; 7qha0w 3o9lusical instrument. If the tuner hears a beat frequency of 2 Hz, what is the ;hlj7)lgw9 paybeqo /0 oqu/ 3frequency 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 twske qcqul dmqu1t3l q/(j01-0o horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a daqj13u0usm(q 0 ellqc/d-q 1kty 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 an orchestra are fouc y/0f)atax3tnd to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. W /a3yt)0taxf chat 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 9iuquh9nv;*w source at twice the speed of sound. The obser;*u9nv q9 hwiuver 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 stationary oj, 0p nw o) igszx85kvs51q,wabserver at one-half the speed of sound.kgwn,zs)5 aq8p0 iswv ,o 5j1x 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 Hsv c az k)(tgz,7t+ -t7kxd7cwz. If a listener moves with a speed of 30 m/s away from the source, s7c 7dz,gc7t -a(+t wv t)zkkxwhat 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. b/n dag2ti8x/It is traveling at 35 m/s on a day when the speed of sound through anid8t x2g/b /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 when a train appr r.yz,o)+,fw)*i5 r gyhg5 brravqcq2oaches withr5b qa5+g wq v .y)oyih,)*2,rgc rzfr a speed of 30 m/s. 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 toward you at 1201q1( uhfft9io km/h. The train blows its 400-Hz whistle o(f qu9thf11i. Take the speed of sound to be 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 stationary train. The train blows it*p/;kvtr at4d8a/ )8 z* c sdxf4lkotos 400-Hz whistle. Take the speed of sound 4s o/attodrxpz 4k*l*vcf;a )kt 8d8/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 nafawf :)fb2l9b s3+ hblows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What )f s9a+fn2 a3b wblf:hfrequency 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 +tyb ntv(4*wuc b1 t+mat 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual freq(umn 4b wyb1+t+tcvt*uency 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 f6d2:1civvy)d-ka 8 k nm ylh7500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if6ya c)- vhd8 1mv k:fydk7inl2 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 airj 3qy3bzg97a i is 340 m/s. What is the frequency heard by an observer if the observer jgia q33 b9zy7is 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. qap9dau x n)m-bglsbl3i,2(myx+w9, A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 2 w-a,nsil( m xg 9,3bxb)yqu9+ap mdl345 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 supere4jo r2j3w /blsonic 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,rgl s* ; d2udld,3bhslq89jf .4. What is the half-angle of the conical shock wd 3l;9bdsd,8jf*2slgr h q,ul ave 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 Statesc t e6qxh4k+c* to Europe with a Mach number of 1.05 where the air temperax ce4tcq+* 6hkture is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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