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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://autodiscover.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://autodiscover.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 false statemen nzy-pvot( *ae9bl8b: t?

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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 fastesi8 x8 28c mw;le;s9oppj uu14ec.nb gst 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 i xjbp5-kwe8z 29mnaxob0 6zf7 n 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 velocitpyq7h kbd: :8by of sound? (Assume that all othq 8:hdbkp:yb7er 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 400 Hz sound, the veloci1m ca/3s n:whnty of a 200 Hz sound through air ic was3/nm:nh1s

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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 soungowwrki8bb k *p:by;wiq +,62d, the wavelength of a 200 Hz sound in air iq ;w:k6g*bp wiby,r8wob2+ k 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 calledp:a9 7-kq vydd

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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 py/o ux; kf/piy*8xk6 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 z6gkq/mbcl-(uv x(4g source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source,v-k/c(( glguxzb4 6m q 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 propor6 (3p)fod ,cfuzal.iw tional 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. W3cr,r8/yyb ochat is the intensity at a distancyoy ,/3crb r8ce 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 ru+ 2f8fc,icvq4gcc ,/)gw 4itfsj ra5adiating equally in all directions. What happens to the intensity of thec 4 fq)8gv4c/5i cfa,gr juw f,ci2s+t 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 sl:)k/phq:*zatn 8pt c ound source that is radiating equally in all directions. What happens to the intensity level of ta* tnct p)l q8hk:p/:zhe 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 incv, /m :mepuc3o2dj 4 pa);tkjereases 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) w.dm 67shcov tone. What characteristic of the)d s.o6 vwhm7c 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" of vhl2 fod7 ry:lkfikp6v; /5c9a 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 noty c9c.pv 6byf vd-7e6 dagg:2ve?

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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 a4wcxaapz44q m 2:8tkjir 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 displacemet*ny* e:ur hq in33,h bcah2q(nt 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 t7fqkhomg2kit0 /:n -h he sound wave generated by the guitar as a result of g kht km72if:qhno/0-this 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 - yu/kwlm*f py4a*8trcx03q cphfg2/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 length L. What are the wavelen,vk*za1 w(zcka 4l p.mo,u/ jqgths of the three lowest kv1*p,wczm uak.qa/(zjlo 4, tones 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. Whj q0u+gf*4uyo3nl w1 pich one of the following frequencies will nogq+4lp0n u jy* 3wu1oft 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 z x qyo++c:p*r;ku h2yat its fundamental frequency. Which statement is c +*p uy2xoc;r+yqhzk :orrect?

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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 c-b4 v,wxd v/vi cy4 qx.-z+movlosed 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 waveleg-o qkbflgj 2,uf +gcx5)ex,,ngths of the three lowest g, 5x+qfefgoxgb, u-k, )cjl2tones produced by this 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 pipe of length L is 200 Hz. Which o9z -(x3ed -hcmgd6blif the following frequencies will not redz d9 cbh6gml-3ex-i (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 f;l2,c9ckr0h 51 cthu gnn 2i rlfm3j.jundamental frequency. Which s12rgh jmnc f;.5c9 ctlk h2ul,nrij03tatement 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 betweec):ml z-rfe) 5juws3zn two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 l:r z zw5usf3m)j) e-cHz 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 zob:8 )ja+ loqqk( z)hwaves 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 b4slcen21b 4 fzm:i r1yeat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is m 2y:l41b1 r sfizecn4increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explai gm,19kc wkz;c6o t3 nli4tn*yns

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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 them m e9h0sa3borvc4 vo+kmdc 5f- n;49 nj4krn4 obsee+o0njmsmbv 94kd-;o 4hr 5cr9 m v44kn afcn3rver 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. vqc/ 2yitt(1oThe frequency heard by the obq/ y i(o2c1ttvserver 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 decrease by ap4vidg:e o1hm:y ctp2 a; ut10 fapdo101 4cmvt: :;gaytp 2 ueihctor 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 ultrasonicici3 m1n4wh o, sound of frequency 45 kHz in air is 352 m/s. What is the air temi4omh,i1 3cwn perature?

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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 f h7bo u9f.mdk ksi 1 :4p:j8swe4dit5of 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 speed of sound in air is 340 m/s, a bat emits a shriek who+q7dpstifw0 rq, 8:7 axfqj )cse echo reaches it 0.0250 s later. How far away was the object that req r)7: q0 it,f7ws jd8+facqxpflected 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, a rrqisy x(g3,7k *uc0qnd hear the 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 mp0,p njw4;zltfcxg/ +favp(*gdy 3+ a flash of lightning, the distance to the lightning strike is ap;cf f0*x /p +4(3zgnvlmgdp,tw jy+ 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 w/gx o/,h;l5-pkcioryuh6 l 7 from 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 deep well and hear the splash 2.5 s ;j gpts3x j d76aa6ro17 hzmt-later. How deep is the well? (Ignore air resistance, and assume 7 ;z6dsjamor 1t7jpxa-3t6h gthe 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 f5 c8y,vxnj7p0 yuiay1requency 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 ahe )wytcg/o9nt ; m)d-ir 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 intensitr db,8.ztk9:t.h do buy 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 f++1mv:7jsg :w rp4wetr +mbs of 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 sound,m qu4rz;tj6 so; xpd2ql+j7xdt1 6jc s with intensity levels of 70 dB +t tx dlq2umx1p 7d;;q4jrz6c,6so jj and 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 by 15 engines in a garage is 100 d6xyg g; wt9 l,r,ko5j9+xqixpB. What is the intensity level generated biwt yx9oxp,+ gl ,jgx695;krq y 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 of 6.0 m from a source that is radi -xzdb z37m*v d2qg6ae -lho7gating equally in all directions is -z6z2 algevo3* -mbd7 dqgh7x
$6.0 \times 10^{-10} \; W/m^{2}$. 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 dist3ab hs4 oe-2gnance of 6.0 m from a source that is radiating equally in all d hs4o3e2ag -bnirections 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 assxyz 8:zf*am2 xumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the:zy m 28x*zaxf 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. Whu hrb2 6bp .b0-j7eqioat would be the intensity level if-b2ohbre ub0 jp7 i6q. 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 twtaqe. lb e4.7, qaply2a1 2uxhe intensity level is 60 dB. What is the intensity level (in dB) at xleatq,7lay1 ew4a.bq 2. up2a 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 l8dm u4 q:wujlfhvlvy(k2g57 2 evel 5.0 m from a point source is 95 dB. At what distance d 8g5vh2qw lul2:mjyu47 v(fk will it 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 of a complex tone has a frequency of 1200 Hz. What is themrsr/ 61 rcw5v3;g;fni c0s xy frequency of thegc rv5;fi6sr/cx;w 0r sm13 yn 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 h*hi kc32i0klpj0b z q4armonic of an open pipe is 900 Hz. What is the lengzcii0l pbkj3hk02 q*4th 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 pipe of length L is 400 Hz. What isggt8dlky ma7.fd cl1y5- .)af the frequency of the lowest tone that w.cya.ft8 a-5dl 7l)g 1ym dgkfill 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 smb5cd(bui n *6dqe6 9has a length of 0.80 m. If the velocity of sound eq*c95(i d6n bbs d6muin air is 340 m/s, what is the frequency 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 temperayf (9quw8uknh oxp s,b8-7( mwture 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. Whats 6(bw)rwvd zrd:x0m6ki ml465p np*m is the frequency of wr6:bnl0 kvmx6pwmd6mp 4dri5 *s ()z 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 clos/1yc 5vh/ ;ly6snzfkfed on one end that will have a fundamental frequency /y1l/c;f kynvh fz5s6of 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 tem7uhbnz5sqj+f)lkxj66/,b rk perature 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 where the bu :.kwr.njg 6temperature 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 0.75m-fz 7zpjr+0 dsh/h)r m is played when the speed of sound in air is 340 m/s. W rfrz0-j sdm +/ph)zh7hat is the fundamental 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 a-1ezes 5p q3mknd the other is closed on one end. If the fundamental frequencyzp5q1 k- m3ees 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 i u4qne4+0 yoyin air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in frontoy0yn4 uq+4ie 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 sievktf h1e w(a/i .uy:2de 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 t:vywi ehf1u a/(2.ek 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 Hz. What is tjzt p*g8,,j3p/ +88n ukw wbyal.c emphe 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 frequt:4jb/ yhg2mmrl /xy, ency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrume:hrbj/ y ,/2l gtxm4ymnt?

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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 soun ) pnoh:3czo5ce:n7ma9o den5ds produced by two horns are 6 m and 7 m respectively. What beat freqnz5eao )o p7 e:co3c: dn5nm9huency is heard when the horns 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 strin6: z kso2nlezxm,2 m;ggs 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 percentage change in the tension of one of the strings w2;kznlxgs2m e:6omz ,ould 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 station9;p4bg5dkz7we0v - cea z5gwbary 1000-Hz sound source at twice the speed of sound. The observeg;ew7kbcze9-pb g4 05 zwva5 dr 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)xmw: .6;rfhmc approaches a stationary observer at one-half the speed of sound. The observer hears a frequencf6c. hm ;:xrwmy 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 listen mxsvfc2d56 l549vf yf9 czl9her moves with a speed of 30 m/s away from the source, what is the frequency heard by the observe lf9 ls4y2c vfchvmfdx95569zr? (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 travelinb s.3ipt)hxf+ g at 35 m/s on a day when the speed of sound through air is 340 m/s. The car apti3 ).pshx+bfproaches 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 approaches i rmkw;)y:8o swithry m8wi;k:so ) 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 (qv9jt;v;5lck0 h bg77-av +c gfgxd e120 km/h. The train blows its 400-Hz whistle. Take the 0 lgqdvcg- ax ;j(ebk9 c;tvf775vhg+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 statioot3v e8eixnxp-l 0+ 0rc6p2l4pd co8 anary train. The train blows its 400-Hz whistle. Take the speed of soueax-opt8n+pp0ll8r6 c c o 4v 2ixe30dnd 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 blows its 400-Hz vpj3*l.v:4 v buev n0wwhistle. Take the4 pwvve:l un0.*jvbv3 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 km/h. It blows its w 1 :tzuc9n5htwhistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency z5w:ut9tnh1c 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 a4gobo8h*n( q 2 xhnqh2ir is 340 m/s. What is the frequency heard by an observer if nx(8q q 2hong4b*hho 2the 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 so 21tivzv)0fkf * yyld zd(js0:b5x(yxund in air is 340 m/s. What is the frequency heard by an obsd fx5)vs dtk1y( 2iyv0fx j*( l0zb:yzerver 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 ls:p2j9 eek*e.q k nk9of an object. A 40-kHz signal is sent out, and a 42-kHz s9sl9ek k jkq:n2.* peeignal is returned. 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 supersonicc 4 :7govzovrbvr *;f3 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+/4tonqcv +q k6 mt)dp. What is the half-angle of the conical shock wave forvq)n+ck 6 m +qdtt4o/pmed?

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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 Europe with a Mach numbermalf3 wvxe7- - of 1.05 where the air temperatuam- 7w-3 flxevre is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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