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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 falsx9r3af ox o tz9s;u 0rnf(+s:ye 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 fastestq)j yglih 2-e5 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 ste;e dszhku8s 3e s k6ijh24yb27el 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 increamc8hx y4fvi+( o8b.ivk5brw )ses, what happens to the velocity of sound? vmf4vi rob ib58()+x hw.y8k c (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 velocity of a 4ch +f-0vbn 7h cc,k.ah00 Hz sound, the velocity of a 200 Hz sound throuh - b+ 7ncccaf0h.vkh,gh 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 soq:e ogv pr*,c5und, the wavelength of a 200 Hz sound in airc v5:r pqg*o,e 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 20,06n(p4 gcwqd qg9 0f9f5p 7avpb00 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 frequed)z18nn(h,m+e 9fyw* nxg)cbt2xm gp ncy 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 emitting waves uniformly in all directi:iik;;; urd*x, i.b; icguuzaons. If you move to a point twice as far away from the source, the freq:*za;u ;d;ii ,iux .cri;bgkuuency 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, int s z0cz)k)lhbe6a*a )xensity 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 frohegesr 5v:4t1 m the source is I. What is the intensity at a distance 2d from tgh1v :5e4rs ethe 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 radiating equ kt3dx3s5p )o3qe;o9f3xil w uy,9jpqally in all directi;f,t9y)jesdlx53x3oqq3p 9p i uk3wo ons. 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 distan: 6lokwev,zrs6c(2yx hm tz 3-ce from a sound source that is radiating equally in all directions. Wz6o swme crh(:t-xy2v z k,l36hat 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 becomel/ x; -glrzn/ns 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 .uou- rx ; u2w.)px9saow:bvqpure tone. What characteristic of the :u. wo9u.roqwps ;b2)uvxxa-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 "loudness" ofs 9dc2*8mqsta 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"86 5ho:mlvpmw 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 wate: izz*nprmw: 8r

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavesm 5l:qzhd c1m2 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 o tt.r j9a.amu5n a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in commmur a9.at5. tjon?

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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,) 4a:qjl ofbd 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 wavelengc ,(pu uvlx.*ce zw3 w*aah;a,ths of the three lowest *u, wh upx( a3w;c avcz,.*elatones 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 rpdc (3ns(1ldum3ho 9 nesonate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in3 md1(o nh3p s(cl9dnu 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)pz(xkfs,(h f at its fundamental frequency. Which statement is correcthxf (f,ps z)k(?

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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 ao+andb( cos).72jtmdg c7p ,u t 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 lengt e801d,k)*hq txv dicgh L. What are the wavelengths of the three lowest tones produced by thi 08ev dx*ckg1t)dhq,i s 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 closed pi)w suv b+rlw/-glpy2/pe of length L is 200 Hz. Which of the following frequepw )sl/ w2+-vlg/rbuyncies 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 /4awv4 zek/qs/ g t,p-gtt7d cm5v5suend is resonating at its fundamental frequency. Which statement is d stg -zustt75 vp ge/,mk5cq/av44w/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 tf4panc3e-zp ue9 oozi m70 w3,wo speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when to ozp,f9pc3a n0me 7zu4iwe- 3he 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 shou 0: fu)scc.+8uhxbxy (h8wl2 xtv:es fld 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. 0t9ytbgovhez0 ,4+ so What happens to the beat frequency if the frequency of one of the tones is incret vyt,9bg00o h+s4zoeased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explagm1izsw(73y3aooq0a ins

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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 obssl gath z(d3)i:kd(pwrv/4 r54fn)oq erp4/r 3rk (d)f(5nogqw4h)sdlzi:avt ver 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 frequencg *8)t vfc4whuy heard by the observer *cwf vh) 8u4tgis

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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-anglwx( 0u(m6 3 vheyb*n(v3phv ece will decrease by a facto(e hwv h06u((ev pcbxv*3y3nmr 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. ztsbm . c+qufo)1kuv)- )xme . What is the air tem) sxkvctb)q m.z).- 1o u+feumperature?

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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 i b5 oedxq3l v+xv0 trt4t7kgf ts(k48.n 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 airl9))x c ylb9 ek;9kdww+5uxjv is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far awayx)d;yvecx)+l99 jbk 9 u5wkwl 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 4b zdhk)l-(u6+5qkvkyl (a.0eo x hy6t:+tvwn.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 li)opk . g: bibypnvo(-aj1o.s;ghtning, the distance to the lightning strike is nbv1 (a; okp oisg.-j y.b:)poabout

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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 temperat6dkc tvy6yw. panl71( ure 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 well and hear the splash 2.ojw) *r+sq5yz5 s later. How deep is the well? (Ignore air resistance, and assume the velso5q*w+j)y zrocity 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 8 m:/jwp qq n ,i-p8xlkt89hrd92qpctfrequency 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 vn :m kjr jqind2j8+it6h5:;bat $23 \; ^{\circ}C$ 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 intensitva+pk,acl hik a2w2qza9349 u y level 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 7028-,ai7boru4jxb7n *glm p xn-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 intensities of twv 0wjqys,oa8 m0k3,fxo sounds with intensity levels of 70 dB and 4vxm80,jokw3fy saq 0,0 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 intensit(5 -dgig ,xh :bxpv7gmy level generated by xhpgd(: vgi5m7xg-, bone 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 radiab eo4vidqx- ;05mbae5 ting equally in advq0aeb5o xm;b-45e ill 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 6.0 m from a source that is radiating e4(lggmd gp p45qually in all directio4dpmg 5g(pg4 lns 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 is586-om-ti f gx / kjvtob6y3lx assumed to be uniformly distributed 5 f yt3v6toj-x gmoik6bx8-/lin all 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 barkingdf,+2;1cbts32 vy3kw/ s)e uscgduq d dog. What would be the intensity leve /1cwf3;dq t32scs 2d)e+skb vgyuu ,dl if two 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 inte t fp1y4y4,ky7:i2jbqopf5xxnsity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directi yf5 i,ft7jo:x bk14qp 2p4yyxons.

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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 5awyj:j db1d3mw8v ;(w.0 m from a point source is 95 dB. At what distance will it bjmwd :8vbwj1d ya;w3 (e 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 fr6 nao4fa( 5thmop5b2k3ab-uzequency of 1200 Hz. What is the frequency of the n 5aabh(53 umo of4b26k-ztpafourth 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 of an open pipe is 900b ni,/ gzlli70 Hz. What is the length,i0/n 7gzlbil 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 resonat4;a c(q ru+rw.d s2vv+gpd0rze in an open pipe of length L is 400 Hz. What is the frequency of the l .0dvgr;r2zcu +r(wqad +4spvowest 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 yuvq v ib-hg -/117xyhvelocity of sound in air is 340 m/s, what is the frequency of the second harh q1g/yb1iu hv y7--vxmonic?

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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 roo lu5x7 sdz q*zc9v-x4nnc6;qe m 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 Hz7nx :nyyo)y8e . What is the frequency:7)xoyye ny8 n 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 on one end that will hajv )f ,+1xaqvbw ;4takve a fundamental frequency of 60 1k4a)t+v;xvaq, wfbjHz 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 isnf .w3zzytg77 in a room 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 rowf cz9 hydwtq. :6nv:*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 soux6vd3, v1u(y9khmxi hnd in air is 340 m/s. What is the fundamyvk1h,mh3 9 vx d(6iuxental 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 s3a,jwf vn3v ()lilp-mame length: one is open and the other is closed on one end. If the fundamental frequency of the openpvaj( - lf3lnwmv),i3 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 frequenc:zwy2l ry42 t.f3zn yfy of 800 Hz in air where the velocity of sound is 340 m/s. w3f24 n2tryyz.l:f zy 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 sideafh,l -o3y lra-;kmo 3gvu2 .e and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and h-3rm e vuloa y-3,.2og af;lkthe 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 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 Hz61m0 k-5clwi9t m hcj/ zyi wv(xuen7/. 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 tunmnjo,a(6ba+s p6ha.ning fork to tune the frequency of a musical instrument. If the tuner hears anj bam(o6 ,+ana.hps6 beat frequency of 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 s0w/zitelev+ y6*j kn pl:yf +wj4g.r *3o5og founds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocijkw3jw+ /y g:olyrz oegfe. 5ip*604lv+fn t*ty 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 strr 3i7ve5a 4f+uh+* ni fcfnwo2ings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What perc+nhff24n3ioar7*+ufcev5 w ientage 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 atx o:u/up5pu8n3gd91, oefqz stationary 1000-Hz sound source at twice the speed of sound. The observer hears a fr:f5, oux /n9do31u qpzgtu8 epequency 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 ro )vt 4 6kuiuh0(lv7eHz) approaches a stationary observer at one-hal0 lvh6)ru4eu 7 oivk(tf the 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 speed of 30 m,io u hzm /*l06x p3mpzck*6bdzmcnz9 t.j*b 8/s away from the source, whatijm369co0 b ph*zzc.xpl6 d8* b z*utk/z,nmm 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 tr*;() oq qvssllaveling at 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 os(l;q l v)s*qis 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 approa/) a lnbhzx95fches with a speed of 30 m/s. The frequency of lf)hn zbax/9 5the 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 120 km/h. l7kr:j z3gqf,r2 4jxvThe train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?vzf:q g xkr7rj34j,l2

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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 dikqf.o 1t0q++wn r3p train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency 3r+pw+qni0 q.1 okd ftdo 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 blows its +syqc,j,s.84k tzppov 6 wb2m 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you heaj oq,y +zs2pvpw6 mc4sk,b.t8r?

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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 ;qc7;fb:) m0y haa q7j+s.eg/enltnp you at 120 km/h. It blows its whistle, and you hear a tone o/ p f qee7n +s.)7acajqmg:hn;0bl;tyf 400 Hz. 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 the yv/9c1*otg k 2uhm csfd7l)7ispeed of sound in air is 340 m/s. What is*7 o)ufvdc27 9tsil h/gkym1c 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 horn is 500 Hz. Assnfr//jb k6(d (vngvx -ume the speed of sound in air is 340 m/s. jx/ngb ((k6 d-fnrvv/ 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 speed10-s 6xfwdlaf* qvk hdgzj424 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 is the object 2a4g xf-z016 lsqdjdwh k4fv*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 i51 0m9 1 ee,nt;smirbgrrg 5ibs $60^{\circ}$. 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)zfs.b0 lmu/7 f gl7ps.4. What is the half-angle of the conical shock wave forme70s 7umpf /zl s).bflgd?

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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 h+0d 0 vkvdb*tEurope with a Mach number of 1.05 where the air temperature is0+d bht*0kdvv $5.0 \; ^{\circ}C$. What is the speed of the plane?

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