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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 false statemtd48 yvd*zauca + )9ygm5 g+gdent?

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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 conduct ,ocsz kj hm-an *q.o15f9tyb+xjg*7ted 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 steel rod?r/)qrg;mp/l p

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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 the7g xwm2gw/: n mcw+k0a velocity of sound? (Assume that all other factors remain awmc2wk: mgn7x0+wg /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 ihcv17msi3 46 p :oty6,jqi ww200 Hz sound through air is7i s1 yp6qht iw4:m36o vciw,j

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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 sge2(n qr1emr2, j.- ic8fgznwound, the wavelength of a 200 Hz sound in airf .jzq nggi2r1 en,2ewrcm(8- 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 frequenciesoaykg,45k,a r8 -zljq 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 call/g;94 xe vqy ai k7f3* gk1qon2qqsg4ced

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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 uniformlyw2gj rs13tfqsxcuy x:g*;:6 c in all directions. If you move to a point twice as far away from the source, the frqs fxsugx:rj 6;tc21wc g*:y3equency 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, intensit0hzxve,0i0wlr va89m8iohcvmf)2 1 x c zsl/(y 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 the source is81ahzvz-ex ir6vk b3; I. What is the intensity at av3 1-a8xh ki6rz ez;vb 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 radiating equ2hu, odvc-+wd ally in all directions. What happens tod+ , oduch2w-v 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 distaou 4pz:hr yyw pl2.8k6nce from a sound source that is radiating equally in all directions. What happens to the intensity level huy26r kw.lp zp:o y84of 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 incr8mtq1l8r/ qpveases 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 tone. What chara)p +swd1z,(wgaw v,a+ c;rs mjcteristic of thewp g vw sa,d+)+1ajc (mzw;,sr 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 "loudnestz,zb: su1c-n mq9q/ss" 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" oo8g; evh.sn4mf 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 aq3)u3jy 6mqpb7 qyski3m c5/eir 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 displacb)9twouc :mg :ement 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 th w 20qdwgr.nr3e sound wave generated by the guitar as a result of this vibration. What do these tw2. wr0qr3 gwndo 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 whi n*fi+yxz+) mpp3 6xo93ot mmxch 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 mljbidmw*vbnwn)x : n.*gr/b/6 *s 9fof length L. What are the wavelengths of the three lowest tones produced bydf: w .lninr j/bxb)msv*m w6b9*n*/g 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. W v9; n;9ub)qhrl tf;gzhich one of the following frequencies will not resonate in the samehtuv9n;;f;b9g ) z qrl 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 itpmeb: 8xe *g(5,jw9aanexh8 is fundamental frequency. Which statement is corregne(ixjh e5 w9b,pma xa8*e: 8ct?

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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 s8w2v skw.rma7wzjt,/ )p 3ef 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 dj*4w v1zzoiaql *hz55z,- dethe wavelengths of the three lowest tones produced by this pi- o 5jhwqdd,1izlz*av*54ez zpe?

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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 resonaufg ro 765t,x78 hceuate in a closed pipe of length L is 200 Hz. Which of the following frequ7t5h xg uecfr6 o78,uaencies 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 resonating at its futiqxjan4 kgplz .8*3d1jk :1k ndamental frequency. Which sta lkkk:dj. t1 ignx413paj 8q*ztement 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 two6bsrc hu;gd, ( speakers driven by the same source. Each speaker produces a tone w s d;h,crbu6(gith 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 sound wavep 6)mx/eho3n;a amf -gyq(yl3s 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 frequevp + qy3nx 92+uq/qkctncy is heard. What happens to the beat frequency if the frequency of one ot+ vy+3/qqn9 cq2 xpkuf 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 explai ylmgnb6 eoe5 0) 9pkq8 ito-qvy7+ku)ns

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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 obs epyamd ;9i-g0ozu5x dv:0ov 2er dyx vz-05ea92o0dpi ;m:uvgover 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 frequency hearo057i1lh(s ek ynr*w rd by the observeh1 kris75( ny olr*0ewr 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-speefm6xvg; x j6b,d, its half-angle will decrease by a factovgf;mxxb, j66r 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 sobg z:er1j6-oj/zjatw, -iw.s und of frequency 45 kHz in air is 352 m/s. What is the air temperature?:jgte jw-o b1.-jr/6ws ,zzia

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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 airy(ul 1w r0+dp7h9ax2y7we.ktr 6djpg 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 w8ab zf,uqa+i cxa-u 5//3a8t mq sk.uemits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back thebz.tu ,5+q 3m a8fxwis/ -acka/uqu8 a 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 4.00 s. Te 7*n;sk+:yj )zsi dbghe 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 diszy-az(wq7q7mybq p7 4tance to the lipb74zqwqz7(m 7- yya qghtning 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 zotjh pp7g 8+c w( ( xklf10u3/ejt1dva 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 sp)9:xrsct cf:l lash 2.5 s later. How deep is the well? (Ignore air resistance, a :trf)cs9 :clxnd 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 ws4r a2-.lwp 8yqkd k2ydwj2+uave 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 amdap,i dwyuwq2vv-j sw s +:(4 4un7l)g88qaf t $23 \; ^{\circ}C$ 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 sound8mt2s;q2l ztd 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-d02 nd 5e v+ldxi(1dvl x49ewmvB 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 intpb9.rkb -zu d6ensities of two sounds with intensity levels of 70 dB an6-bbd pr9kuz .d 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;. .yfke edgm ;r(x/*se+ vfxu dB. What is the intensity level generatd/;s;y ek+f* vexef x(r. .gumed 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 sourt3+,(:tym 0 poiot guyce that is radiating equally in all directionti :0y(goy,t +muo3pts 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 rc ) cg+gau6n7kadiating equally in all du7 ggck+n6c)a irections 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, whicrqzgm b+;ir8 ;.hv1ip9q 6bns h is assumed to be uniformly distributed in all directions. What iq pvgimn8;z1rq r9b.6bs+ih;s 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 distm -bzf x8;z;rzance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very cl -8rx;mzzbf; zose 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 soxgn0:d+/)wjl to ,/oo wsow8fund source the intensity level is 60 dB. What is the io)w0jofn owxo,s gl: +w/dt8/ntensity level (in dB) at a 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 level 5.0 m from a point source is 95 dB. At what d i1saxqh 5) dg+x9dr.nistance wsddr1. qn9 xx) g+ah5iill 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 cq6de+u ,j2x:oslbj .f 72kwd yomplex tone has a frequency of 1200 Hz. What is the frequency of the fourth harmb. o:wy27kl q, 6s2+duj jxefdonic?

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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. Wha)*e7;msfcag h*qj8e q 6za(wwt is the length of the7ja s;whmceq e *agz)*86wq( f 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 Lxv-k 1 qg+: a3pschp,e is 400 Hz. What is the frequency of the lowest tone se k:v ap+1 -h3gqp,cxthat 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 velocity of souc*,59rbh l wr -xs;qqp4r;z vind in air is 340 m/s, wh;sv li45r,p;*hbzq-qw9x cr rat 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 temdadrtr70p u 10 6k,da4-wb zxzperature 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 7 azc pwlmqf3a:u 4+6eat one end is 330 Hz. What is the frequency of the third harmoni6zw+f 37a q:em 4uclapc?

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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 ofobtkxg029 ,u h the shortest pipe closed on one end that will have a funda9og2t, ukhxb0mental frequency 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 i htr6 l4h ktwd//5n2orgidc, 0s 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 room whxw 8leqzrw:6l 6n0ev)+ qlkny 6 x;n*qz/-z tlere 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 0gx)ue**l3x li fpgiv i,/8a70t1upr s.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental frequency /lga)3ru7si u08x 1e*i,l fgvitxpp*?

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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 sab w2lvj9th/ tu4 7r*egme length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 30rt97 jubtw evgl 2*4h/0 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 u n a),6.4xnb jisha9dof 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would sourcei., abn) sx46jh anud9 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 driven by the same frequency y vfq/vkr h xnpnrm2. 5o5bi8g59-0eaof 500 Hz. If the distance from a person to one speaker is 5.00 m and the person v .5b8/f0k-ihmvar 559gro q2nen yp xdetects 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 frequencie 4aowf 1g;h sg5 ys,,vigv0kw:s of 440 Hz 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 frequenco l .+ 3lmayo( e+xal (lw8dq4ci;-iery of a musical instrument. If the tuni ow.- lqm e3a+4( rl ox;yld+l8ie(acer hears a 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 soundip(elvngta p o087 00ey(lnk2s produced by two horns are 6 m and 7 m respectively. What beat frequency is heard whenkyavp ipn 0 0o((g0e78e2tnl l 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 str k7hf gr)j7-*dls:geu ings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is ug 7r7klsj-feh gd :*)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-xq g aqv)7yar73-c8afn7u sv/Hz sound source at twice the speed of sound. The observer hears a fq/ny ga7)3 7u 8rv7aq- xfcasvrequency 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 stationar1v4adxgbjdrh2(w7h2 dodd *,y observer at one-gh va xdd,417wd2jbd2(o dh*rhalf 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 q40e ghpc)h5km/s away from the g 5pkeqc h)h04source, what 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*qa1n b5(jvxy3paqvr7 :q , 5kxqb9fhaveling 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 the roadside. What change of frequency does the observer he9: a31r bq *k,qvjyfq57pvxqa(x 5bhnar?

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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 g:8+j.*si sdv z-n idha 2p*sfa stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed on . z*g8sdd-i vi+2fs* :hsjapf 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 x;cef6g75(qm v adn a;at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency doaemgax6 ;nvd5;q c(7f 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.ej.bhih1j4 rd;opf jy p1/, hr-yo8,v The train blows its 400-Hz whistle. Takb1hjjoyvfy ,-;4or.r,1h pi je8dph/e 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 awa8ofh)7vd em/ ay from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. ) d8m/aevfho 7What 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 pgd-t2jhr 5p q k)*jcn(:-zei whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. Whatj pq c)rdzh2n(g*e: -jk-5t ip 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 speedo ;qdt:2;mosr3.dhg r of sound in air is 340 m/s. What is the frequency heard by an observer if the obseoos; g: htr r.3q2ddm;rver 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 500aeo 9zch;+24eco bnv)v*vwa4 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?n ehvo; vb94czo 2a+w)vae 4*c

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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 squa9 rowi-lp/3nu2 :speed 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 objecslr2/auqup: win-o3 9t 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 su 8fym+a;c -zifpersonic 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. What is the half-angle ofnjadf5:y*tkz 9u s ju 3o:f(e; the conical shock wave fornfzo fstd3 *k:5(u: aj y;jeu9med?

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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 frol wa m4(xo*np*m the United States to Europe with a Mach number of x( n4wpo*ma*l1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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