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习题练习：Physics Unit12: Sound
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 70，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test70.html  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。
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 游客未登录  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 fabh/0a9n)bjs7d b5s8t4 a3j m*o bqsj klse 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 cotfgl 4hj. lw1t, k7nh,wf*igtj 6 3a.onducted 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 mx(ydg-b jkf* v;(q, lsteel 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 :war+ xpo:g o3the velocity of sound? (Assumeagr: op3 :ox+w 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 velol p*xp(q-r/fy city of a 400 Hz sound, the velocity of a 200 Hz sound through air / yp*fqxpl-r( 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 sounh(t2kl .2 fanad, the wavelength of a 200 Hz sound in air .fl ktah(n22ais

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations withq;.wy l*f04rff)yuvs2* 0rgxl1 e q jm frequencies 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 frequency less than 20 Hz are calx52q*w uvcgu)4y uq6a led

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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 uniformly9t 5z+ wi0eial5nwa0l in all directions. If you move to a point twice as far away from thea+l wni00l9eizt5 w5a 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, in8to()ai3l+a,orvy y2i mxzo4tensity 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 thcgr103rxeb3 4 nnyv(3f.s+b thkl b5se source is I. What is the intensity as kl(+3srbrgn vf4 e c3b5xbnt0.13yht 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 from abv1v7y dh/*cc sound source that is radiating equally in all directions. What happens to the intensity of the sound? It rh/7 cyv1 bdv*ceduces 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 radiah;zdf v .mo)am0p/k ,ating equally in all directions. What happensmd/a;ko0h)pa.fv mz, 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 s*y zlb0b-adw9ua 7,w jound 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 0.l :v xw7slzwkg i;y0emitting a pure tone. What characteristic of the sound inc ywwlxi07kv:zs.g ;l 0reases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" oc( cb kb)dy mn/v/5nosm0+ro:f 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 " s;0bb n*cy9hzpitch" 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/ qy8p s/hckz*i.1glwr

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement :z drc;re3 pdid5-o u.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 soz+ v xb x134,x6j,/nezq ikzlxund wave generated by the guitar as a result of this vibration. Wz4 j/ ,v3exbxnz+izxkl1 , 6xqhat 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 atz q(h g4rqil18 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 th,gs uzq;h5 w:gree lowest tones produced by this p,gswquhz :;g5 ipe?

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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 opz)*lhyfjb9 a1.h 9n t*bnyax .en pipe of length L is 200 Hz. Which one of the following frequencies will not resonate ia)by*f 9nal. tbhx 9.1*ynjzhn 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 z. mwfl aa73/oresonating at its fundamental frequency. Which statement is cor7 az a.3/folwmrect?

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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 cl qnq8nc6ltv7 83fr hq3osed 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 ox,h y53pmd2y8b ruu/t f the three lowest tones produced by this p upt8 xhy 23yu5m,/brdipe?

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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 ifkvf; 4o )t7osn a closed pipe of length L is 200 Hz. Which of the following fr4o7 )ksv fo;ftequencies 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 resonatkjrst*f *yx4 .b: ;r0ftp 9jb (ckmv;ling at its fundamental frequency. Whi l4 kj0tr ; .f:*kt(*rmpj s9fvy;cbbxch 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 speakqr0(7 jevjnp ;ers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when ve0q;(jr 7pjn 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 beatsrx-wg06nxy h5v(z0hxdg3n l3, the two 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 particular beb-qejldr* igbo ( n1i)cmm(y:s4/ ov2at frequency is heard. What happens to the beat frequency if the frequency of one rg)2 di14mo( -y*b /n(cvmoies:l j qbof 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 explainslw v( +h1l 0 fttk32v-wfj)wkd

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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 obsapu4- qgj6v+ucvvk12yuy 9 ) server i1y4vpgujsqvc9kau2 y -v +)u6s

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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 fre- bikl+the- r6quency heard by the observer isbk- le+htri6 -

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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 decptw t*sg-whb5z 3-,ztmak6k /rease by a pt3-tkw,5bzk6/wzg * a- hstmfactor 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 ) z1 ,yl4em;mvzx9esk is 352 m/s. What is 1v;xs zm)keyzl9e 4m ,the air temperature?

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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 spee-onr0tmd 8.c0n s /yold of sound 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 speedga8 7h/ja8c bz of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the sound?ajb8hc 7az/8g

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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 t6v (b fcj/9/rkookl e)he 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 flas qv wdlx1vy 83kxn uzt+(.l9e:h of lightning, the distance to the lightning strike is aboutzyt9qkvx8w 3n e+d vxul:1l.(

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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 f,lkyw ekt *t: r5:7crcliff 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 deep well and hear the splash 2.5 s later. How deeg(-pc +v2 kprbk6e3irp is the we2+k6e-3rrkci gv(p b pll? (Ignore air resistance, 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 sound wave of / o)a3h 6h8zkylmh7mi 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 aa 9jlgaifbrznq-9bb3:4 7qb 4ir 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 sound with iu+v ta0 g)bwr2 pxz3yg3e*y-cntensity $10^{-3} \; W/m^{2}$?

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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 o tqrrhm9v cp:5i7npe) p4-5 dhf a 70-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 two sounds with intensity levezwyc8n56 npg:s2g w8qls of 70 dB and 40 dB?c 8w p8sw5yzngqn62g :

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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 is0-b u -r*fx17 jemhoyq 100 dB. What is the intensity level generatuq jr7x1-m0 he-yob*fed 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 oh i,l3ob(ve8gq 2i8qq f 6.0 m from a source that is radiating equally in all directio8e gq2oh3i,i (bqq8l vns 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 distancec:wlscq+skk8) 11 akim/5bep of 6.0 m from a source that is radiating equally in all directions bae51 l 8ps/q)sk:wcim ck1k+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 ama2er 4 kvi,:obout 1 mW of power, which is assumed to be uniformly distributed in all directions. Whai:ar,k2 ve4mo t 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 :f;d+ o6kqay.d envqz4ow*g9 from a barking dog. What would be the intensity level if two identical dogs very clo4go ea qdn+6 zfo.*v:q;9 ywdkse 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 a v7hmm/*a 6fa/pub1pf;z*r em from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the sou ;bmum1/z f rf aap7*h/*aep6vrce? 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 m a8z7aplnw tw :r87f9dB. At what distance will it be 75 l79m a8 78apnz fr:wwtdB?

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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 ph .fx k:gi:0afrequency of 1200 Hz. What is the frequency of fk .x g::a0iphthe 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 third harmonic of an open pipe is 9qew i u;tr /h68ic8-b,cv*zvs00 Hz. What is the lengtsi hcwqrbv z t8c;* eu8v6i/-,h 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 resonate in an open pnbop7 yr4 u;r*w/zve.8z u(hxmp 91naj ji-f4ipe of length L is 400 Hz. What is the frequency of the lowest tone x fj7(pn*jz ibm9- oz8n4u1vr/ry4wepu;. h a 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 le hhzwsos9i,+lgt3iy0 i5572mxs n+x vngth of 0.80 m. If the velocity of sound in air is 340 m/s, what is the fxgi h25 i xyv570i+3won,zts9sls+ mhrequency 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 room where the temperature is13qxf p1l 92l.dnjm6* fuyog h7bmu l( $20 \; ^{\circ}C$. 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 c32m clob9s +bb+xj y5plosed at one end is 330 Hz. What is the frequencob yp+5xjbm 39bcl s+2y 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 pi(m )9qsli0smzj)u e3 sqnq4 r/pe closed on one end that will have a fundamental frequem)ns(q j ri /zs)e0lq9mq4s3uncy 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 room where the tedezus3 3ji6p.s q 9j7zmperature 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 in7 m;4s5ihjx dv a room 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 ifdvrkn* k fl*d2go-; ;f:a4uqn air is 340 m/s. What is the fundamentf2 k r*fa* o:kd-v;q 4ug;nfldal 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 and the other is closw;ovf.k )4x wwed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundam) x ovwf4kw.w;ental 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 H si fra 802*mm1ku2mqya)f k0iz in air where the velocity of sound is 340 m)rimsk0m 8q uak 2f yf*102ima/s. 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 side and dri kj4)e3j8lsqn ven 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 pejk3s)e4 jn lq8rson 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 H rnxinnve-5 e4gb--d: cg7:mtz 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 f*9g-y;nf t ,;ard kxxf4*mbo 3um wyf0requency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what *w,fo u-by0m*x 3axknfrft ; y49;dmg 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 produ5b jin:wn;7 /jrrocgol7 ktrt4q):z,ced 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 velocity of sound is 340 m/s, c5g7;bwozr:4rji/)r 7tkt:jnl oqn ?

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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,ng+ ,cqi7 jl0/rvt hkw8sz,fq.7l sk found to produce,ctn,wis 7q lkf0.l/ ,+ vgjrszqh 78k a beat frequency of 2 Hz 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-Hz sound source apun:))aq7ejf ltv k2q26e v3,xt ums,t twice the speed of sound. The observer hf23 ,,ju7vs qevut a)6 x:q2 )nelmkptears 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 o(x* sn0q8e*pr z cnez6f 1000 Hz) approaches a stationary observer at onez6z(x8 n*qnee rsc*0p -half 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 listensr88iv5 4rsmier moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 mi 5vs8rr8si4m/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 8yu)hc/p g6 z9j00-Hz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes ag6 cu9/py hj)zn 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 whp+y6j tcmyz9wb0 b vig jr:52(en a train approaches with a speed of 30 m/s. jw50i9bpmtbyy v2cz r:+jg(6 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 zj0 k/f 21diaf120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you he/iz1afdjk2f 0 ar?

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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 bla c(-z4 0 zv-m55orzusmi7xfv ows its 400-Hz whistle. Takmf zmi (s 7-ocz5r5a- xuvzv04e 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 8 4weotnvg4-eko/c5b2nrb f*blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whateb2/*o 4kevrf gbt8cn 4- won5 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, an2* dbsyj7df9kv cc t4p t-wu;(d you hear a tone of 400 Hz. Take the sp2k 7vt* d4 -cdsfy;9pbctuwj (eed 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 izs9-fw jc.cryl4o0 tdbjexw* j*n6 *7 s 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is movixlj4**j 6 yfw crtodscnw z0 *97.-jbeng 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 ai p v331jp ,2lavag/ rq)tc,uph9* xttsq q39bar is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speedg*v qa/a pta rpjt1c9bl2xqh)s,puv3t3 9q 3, 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 detuac qlcs();kehu :g+6ermine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returg6hl ;( s+ acue)kuq:cned. Assume 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 by a supersonic aircraft is p5 ybe-p5f ;7qk7ijht$60^{\circ}$. 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 the conicalu wykzn+x 5-4r shock wx+uyk5z4-n r wave 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 z o*d1i1f:yje* xh v2jtjds)0 from the United States to Europe with a Mach number of 1.05 where 1ojsvx **fy)t d zh1i2jd0: jethe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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