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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 statemebkj*rq tx4 5)bm *3txrnt?

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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 faux/xsp pw :j /qyl-:g ,2knx9ystest 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 inj(ut*gn tqbp6:n4 4zo 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 v6;a xrur-jy e;h 1t2unelocity of sound? (Assume that all oth1n r;2earu -;uj6hxtyer 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 velocity of a ,)hs-oo+/ 3lkbf0cdyht 2ib h 200 Hz sound through a-k) ty3hhf/i0 ocbs+,l o dbh2ir 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 ep;n duk9i; am,euky(+..i pc200 Hz sound in air u(ce+,;k9epadin;ky .m p.u iis

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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 areyjt ix zke: 53g0px+2g 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 fzhc8ohm 9 swtqlr+c++4 2sw,nrequency 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 emij qxa4-;k7epjtting waves uniformly in all directions. If you move to a point twice as far away from the source, the fekajqp4 jx-;7requency 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 proportional7.l+cdvw) oqp5 n8twl 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 v-; gww;qpd;tI. What is the inw;;gwt-v d qp;tensity 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 from a sound source that is radi;ef: 4kdp:0z qs)m4 irwe x0qnating equally in all directions. What happens to thn0)si4 q xd:er;f0k ewm:q4zp e 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 from a sound source that is radiating equa6s/ts+a ruye- :vit,zs h+: gwlly in all directions. What happens to the intensity level of the sound? It drops bygwevh/+ -s :+i ,y tr6ssu:zta

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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 0*qthh)(enu *5zzu bj9f ue/obecomes 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. Wha:-nfck78dop 6m qh.btt characteristic of the 6k- nqpbd 7ocfhm.t8: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 "louclf;1m6yf-3 pnh*fk.b6)p y ax:wo zudness" 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 a m0 yvcnu8s 8t twf:yeu:3t.1 lousical 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)txvavq6 75w* k3 ghtac7xkl) water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemejb-wt:5 mog*rwh 6ys+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 andalx t cz k8377( kem(+:ccvqsz the sound wave generated by the guitar as a result of this vibratczeq:zvk3 8k( s+macl t77(cxion. 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 whichkl6n -7* bzy4 m7dzaxv is open 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 wavelengths of the three lowe;63 o4kmkj fdest tones produced by this pimek ;djo6 fk34pe?

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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 pgpl xn- r)6 sk:k7q8wj.3x/kiddr2w200 Hz. Which one of the following frequencies w2.r 7dxj6 psk wpd kl8rnxg/:ik)w q-3ill 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 resoh84+t 7djgy5kd5xq1b p9ofm l nating at its fundamental frequency. Which statement l8qhgpjf b7+9o5ty md45x1d k is correct?

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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 thou 8n l-lyhy /./mhjx moy404eng(do7)oz7vwe 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 wavelvw2ib 9rh3( 8a1,aal p5 sajzlengths of the three lowest tones produced5whal ,av1 b9( i8 sj23paarlz 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 l0ha;jhev o/pns-oe-3 6xju5 aength L is 200 Hz. Which of the following frequencies will not re6o /hsje0pv jh e-xu n;5oaa-3sonate 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 at0h1efnp j0 spy22 v6av8ha;vo one end is resonating at its fundamental frequency.n 6 po;v2p2a ja 0v1s8yfhvh0e Which 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 speakers driven by the same source. Each speaker p7f ec0rqw e(*troduces a tone with a frequency of 200 7(c0fwe*rq te 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 beat-ld5 3jvuili2 vs(k46ebm xt 0s, 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 beat frequm1i1x88 hrel s)l5a.m-ayly b ency is heard. What happens to the beat frequency if the y.m 181)rx yelalhl5mia8s -bfrequency 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 explaig(j,q/ncwc) /vi,x n lns

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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 ,ie qd(ia/ orrht; o6)observ(,o ;r6/o rqaihd)ei ter 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 frequew p(x1o) thg7zb nvjpf3r0924 k;wiwk ncy heard by the observeph jbo9t2 wn3)k7pvx; (krizgww f104r 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-angleg vcb+r mdea0k8z(+z ms- ;f;h will decrease by a fachrmzf;(+; 0d +- eack b8zvgmstor 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 irqxp q/1w .iu0 sfm(1da0t z9iqye0 8ls 352 m/s. What is the qiuy11 t/qdl89 p rs0mf ie(0 .xwqa0zair 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 dfm(idnm r -cq/en6(6 cftmp(p,x* 1lthe speed 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 speed of sound in air is 340 m/s, a bat emits a shriek mbxq.ryu7jh7.8 93jzn pgk g* whose echo reaches it 0.0250 s later. How far away was the object that reflected k zygr.7.q8*gh jmu3xp 7nb9 jback 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 4g.i*5n*zfg ja .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 oa tzx*w7wum1v/-t-f s f lightning, the distance to the wv /a-ztf1utx-7s w*mlightning 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 on a day the temperatu)yi9ohl0xb aum5fjh .1 nxg02re 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 ww5) cel5*kbu 6;gk xebell and hear the splash 2.5 s later. How deep is the well? (Ignore airlkw e;*b 55bkgxe)6cu 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 ofyu4:q qm(xb( .,idds j a sound wave 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 a rc) bfc4-dhy6t $23 \; ^{\circ}C$ 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 level36 f-w /bn6u6ahz w u1wwjr4gy 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 70-dB xv: o+ j/tdu*kk 00ynesound?

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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 intet5:y mfm+wo 9p;b2 hzekub:(t nsities of two sounds with intensity levels of 70 dB and 40 wze 2tb :yfh9po5+ km(bm:u ;tdB?

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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 f zxb.rgg33vo9bq3r ra9pqj+e 0*/f hintensity level generatehef g+ *gra3r099 o.33rjbqpq/xvf z bd 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 of 6.0 m from a source that is radiating equr0 u fx lzcw7n7yzl 4;v:9iqgsblic (6++0rokally in all directz l49vzw 00ccn+iigorrf7x;6qy k (llsu+b:7ions 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 acs6/iz;iqo y 29 w92kpa5kvbl source that is radiating equally in all dirkwv z9kb2qy;2a69si 5ilcp o /ections 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 6t y;o b3tlv4ipj 7c8bi0/ umsto be uniformly distributed in all direcp63i/c mv j ty4btulo0s8; i7btions. 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 distanvhb;(fy cs feo6+v 2)cce 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are barfv(e)f sovc6b;+ hc2yking?

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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 pe3qtzx+c kw)(i kqlt z5zpd,o 07)2 jis 60 dB. What is the intensity level (in dB) at a point 2.0 m frzjk2,i))c3 qq zt(po z7t5 0wdp+xeklom 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 from a point source is 95 dB. At whatl7qo 3 m1lb3cmb ,z-vo distance will it be bml1b m 37o3- cv,ozql75 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 to,v hkum ,l q+z .66puukgj05xeg2.x)fbutlo:ne has a frequency of 1200 Hz. What is the frequency of the fuh xlg 65 :ez),f,. .kbxt 0qkog+lmuujvp2u6ourth 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 900 Hz.yhrn ex w(doez 8h,*6; What is the length e8dew*rohn(;yh x6,z 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 resonau8h y-l;v-pwip*kypx 2d3 : xxte in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will pykw3lx2vh8*d :i-; uxp ypx-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 .d2 6hz iij.sal7sa2i0.80 m. If the velocity of sound in air is 340 aj.s76 d2 is zilih.2am/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 i5cklneua4)g51r yb*fx6h; jm s 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 3 :cvks-o an 1eg-z8, s.9njvrs30 Hz. What is the frequencs8--a onn vskzg.s9rj:1 c,e vy 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 qne1een 0:6zr end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is ner6q0 1e:ne z340 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 theohag410 ;c4es aqn2ei 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 ish;w.-ln5a c4 wum3oftb r:/s s in 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 9odb,l s/jy0rin air is 340 odl9b0 ,j/yr sm/s. What 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 and the other is closed on ontv un2dlo9 60ee end. If the fundamental frequ lt2 de609uvnoency 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 emittzksu3 :o5 1q7zchg -z a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to beqt1csuz5 h: z zkgo7-3 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 placo.xyso3ctfa+m78fr6bx 5)w:rbiy4 zacu ;0 ted side 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 a possible the distt.b7 rmsc8 ) 0if:zcyu4y oabxf56;awor3+ xtance 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 t88oqm45gig31y qa 0b4e wuyg - f+qeykhe 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 5 arlz7:r4sfwjaz9 l+i4 jud;:50-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency lra9z7d jw4 :lzrif j+:a4us;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 p:zq1 it rh f5 .opw1hqu00f9:m5)ckqd osj+uaroduced 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 f0oca0 w:uq1h.j fdir+hq1uz 9tpq)5o:s 5mk 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(czuiha4/ f q a64g;ho violins in an orchestra are found to produce a beat frequency ou(cif4z;/ 6haq4oagh f 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 jd8 qj ,8q )/x*nbdpjzfy31ipsound source at twice the speed of sound. The observer heard p*1fjj 8 xid/pqbnz8yqj3),s 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 10roqs7z j t7j3.00 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency orjj.ostz 73 7qf

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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 frequeqij0xm g d8o-;e hr:8fncy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, hmf8ejd: -x;r8 oq ig0what 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 tx pu(fumvki,4 n0n+:* 4cxzaaraveling 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 is standing along th, :vk 4um pzanc ifux(0+a*4nxe 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 apprn9klj2i-) x qrnq yz-4oaches with a speed of 30 m/s. The frequency of the -lqz inkr9jx)4nqy-2train 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/htjbc;ppv4f98/yim n 5gzu(3y kyu,3 n. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fre;jzv , 38y 3pm4yb(9ucup 5nin/gf kytquency 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 its 400x3ugn9x5r f o:;4okk, m fs2yy-Hz whistle. Take the speed of sound to be 3402;x u,5kf ooynfgk:xry3m4s9 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 awa :jit-/kugu)ky from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?tkui/ g: )k-ju

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is travelingwerns gs7c;) 61how-d away from you at 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 acshd w7 1)sgc-or ne;w6tual 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 thr8gpah13/ xo.n scay2ky hq ,2c h3z-ge speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away3nhgk 2y8,cxraap . 2cs1qz/ghh-o y 3 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 souy9eh8; +vrnht nd in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with ae;vyh9 n+8rht 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(b5k3;h0l gab ydo (m j.fefo;. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of so f(;b ojkbm0 ;. dl3g5h(afeyound 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 superson* yc suo s3xwz99+ pibz736xqfic 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 spesycss)4 .r-l:k kxb2i ed of Mach 1.4. What is the half-angle of the conical shock wave fos)r sc-i. kk2:b4lxysrmed?

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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 Mbflslmrz5 v 9tb; l:-9ach number of 1.05 where llrbm bflt;-9zv5: s9 the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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