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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 statemen9e mn 1vkek 1a-kfus4cx a55:jt?

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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/j,huyc pb co9artkgl. :2ulj34m x56ed 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 steeyx+0xhxy 7- -f flege(l 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 increase1 ,n 3a2xlmfqjpw;a :-5mhxg5, nkxlus, what happens to the velocity of sound? (Assume that all other factors rema5-aj ;lq3wp1xxx u2mk 5:ha,fn gmnl,in 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 200 Hz sound tht 5(b-km 4gljtl*z le.r*./:dy lajltrough a/tl- jl rgm 5dlk*(l. :btyaljz4et *.ir 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 ngvhu:*gauif, ,jy bs1*z 3c, a 200 Hz sound in air iv g*y,,1j:nhbf*ga 3cu,si zus

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenciesv qx*sf0dz0el i.8i2s 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 fr b 93ckv/d*jbpxs6,lqequency 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 unifomw3a)ow3/o 8kv5 t ts-l1 m/gpt )xvjarmly in all directions. If you move to a point twice as far atgvo-)wms 8lpv )ajta o/m wx135k3t/way from the 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, intensity is:usx/q0o /os- 5ocdzl 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 is I. What ir/tt)eivhm 8/ s the intensity at a tv/mr/hi)e8 t 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 s jlf;ec6 )cgztulye;a79o g 61ound source that is radiating equally in all directions. What happens to the inlo 6f g9yclg;)a6tc j7u1z e;etensity 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 equal2c ,) mbke7qz:e40jkmbj y rv,ly in all directions. What happens tqbkv ,c0e k2m7b:),jeymjr4 zo 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 increasec 9v .co(()khm3cqw cnp t)t;xs 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 speak0we+ 2)ciktjser emitting a pure tone. What characteristic of the sound w2) s kt0ei+jcincreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" :e0rao6 i n9pdpz,) .rg x4bpmof 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 "pitcnw sx0 vjp)hl wx 0iuy9:vukf:x:;k ++h" 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 i arvs1uqxj8csvh6ov a;8.l:0 nto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavw- l,lhyx 6eb 0l/(ev:q7rja7 x4o vsjes 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 strin1ikt o)p rbe;5y,yzy0rzk qw1. lg0kog:, gi 5g and the sound wave generated by the guitar as a result of this vibration. What do,y tg z brp1kok,5r:o 1i g.ik;gy0q0ew)yzl5 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 pq)exn k3,ftoh-oz0 )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 +l2epdu *iyq ;t.v x;xt ipj45L. What are the wavelengths of the three lowest tones produced q 24et;xu ijd*.ixyvt5l ;p+pby 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. Whijubr.aj w+0e* g ry, +fv13imf4aq9b sch one of the following frequencies will3w1 b.jiu4br9+r+vam f fgyas ,0j*eq 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 Lulwy2boigzhl- 2e;) 8 is resonating at its fundamental frequency. Which statement is cl;ow8z ehl2ugib)y- 2orrect?

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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 cr-9b)2*ej obwtc uw g 2p;virl(9 rd+which is open at 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 length L. What are thl uz,/o:5ph+ yd*vvfhe wavelengths of the three lowest tones produced byo+dfv,p* l y5zh:/u vh 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 ofbumrct8g.3 fas scz-m o:39 cx.-xh,s63enlz the followin:fsgm3ct- x o-39 l sr zue3nh mzs.cca86,b.xg frequencies 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 fundamentadjilh)5sq /70 ch (jvv ab-*5kgtw1 izl frequency. Which statemenh i chs0qg7)wtz(jv- lbd 5*j1i/vk5at 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)lsvu 9gl zm*-. Each speaker produces a tone with a frequency of 200 Hz on a day when v-s9gl* )uzml 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 xm m op2f.;(8;yboa nzbeats, 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 frxk m/v-hi+x8ed yxx6wyj7 /+lequency is heard. What happens to the beat frequency if xx8l d y/+y7xmjhkwvxi/e+ -6the frequency 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 explai pn kv0l(5 5l9en-wun 2iks3sxns

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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 freque 3.dykxm:by ,rncy heard by the observ3bm y.:,xdrkyer 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 obserplh ky; jce-: *m0wt6pnlfa87ver. The frequency heard by the obser7wct h0*f p ke6m-panl8lj:;yver 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 MAC.,jjpmotct /xf1k -+ zH-speed, its half-angle will decrease by a fcj -t om1,fzkp+.tjx/actor 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. Wha6zzjft5 c (wd0t is the tjzcw6 f5z0d(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 speed of sound in air ak. wrk(df9 azn.pjk zd h1l7/2t $0 \; ^{\circ}C$ 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 so 5:,bpv 1/ ng-sf2bfbh0r6- lrnzkx isund in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s sigp kbznfbn/lbr r -,2 v60-5:x1fhslater. How far away 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 4.00 s. Thbu ;0cnbnuozn-17x.i e 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./bbl 6 9 jk9ad,7mcveo0 s after seeing a flash of lightning, the distance to the lightning strike ic oka/j9meb dlb796v ,s 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 tempera tk3vp/vm:o )uht7b* mture 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. p8jvjq8 .td3o How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 m3. jo8pjtvdq8 /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 freqdijnwu f,bo inh4(9g)rz43 7suency 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+s/x-ft /p )tay4g0tkq dm2 un 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 lev 9;unxh6v mf/pb+eu9del 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 70bkt ovrco os*sx9( /,.-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 th1 yz :6rvy :tsr.q8buoe intensities of two sounds with intensity levels of 70 dB and 1o usz.q8b6 yv::ryrt 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 100q8go: le h klifaaa6(n*f, 45i dB. What is the intensity level generated by one eohfigf4,il :e6a 8n 5(akla*qngine?

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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 equallye6- 80fsuv-qhkmcw x(p /b(yq in all di/qex(pc u0q6 wsfmkh- 8vb y(-rections 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 distancf 7yho*uc--wqdes8(o dvbtx+6t. n+l e of 6.0 m from a source that is radiating equally in all 8d-voyt +t76w-obfl.u+ (nxec*s hdq directions 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 mWlzecddb ea 60pf )jim 2*c*f(2 of power, which is assumed to be uniformly distributed in all directions. (2c*aecedl iff*0 mpdz6b j 2) 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 (5i zgid-s-ji gk)9tn a distance 5.00 m from a barking dog. What would beij--( gkz)dgi5t9 is n the intensity level 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 intensity level is 60 dB. What: u h3v-vd k107pz/4trzdrqrn is the intensity level (in d :4-rzudzpvnh317t/v rqrk0dB) 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 distance-7hdm 0pxv3vm will it b3mp- xhmd70vve 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*h +a)ij- fx(tgpewu6 complex tone has a frequency of 1200 Hz. What is the frequ xi*hp 6fgea w(-)ut+jency of the 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 -7s5cm;obsjqthird harmonic of an open pipe is 900 Hz. What is the lengjqbc;7m o 5s-sth 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 is thhr ,1jevi q3ih/ 27cl,xvo0ice frequency of the lowest tqv/0ij3xc ohcirvli7 e, ,12hone 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 len2vu.xv,2k ,pv+ki qa agth of 0.80 m. If the velocity of sound in air is 3avv,ui +ka. ,pqkx 2v240 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 tempp tt 4mq5 294eyn xyi:+dykx mt-x(hu+erature 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. Whausb//t (ac71dvr; trat is the frr d(1tv7s /a;cr/ atubequency 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 tas)p s b )ca9zx3c7(xvhat will have a fundamental frequency of ()aa3 v pccszx7s)bx 960 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 rja4)c3 (n kr.afmnlwx +w0z.hoom 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 g5 ;*,5qyz9m/ ieysbt w wvs,buvdt77 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 0.9hn kj5bxb.0))iztdf9*ugqz75 m is played when the speed of sound in air is 340 m/s. What is the fundame.x9f)h zij btnkq5 0)* gzb9duntal 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 t ltk9+qh bz6l*he other is closed on one endqbzh*6 k+ 9llt. If the fundamental frequency 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 in agsgal nl-rx(q6pcc8 i-4dz ,4ir where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an c( nxir,z8 g-spa4c6lq4-dl g 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 place ue ;3mf631xy 5txxm9cd:zcr gd side by side and driven by the same frequency of 500 Hz. If the distance from mcge x m1z3tx6y9x 3d;f:r5uc 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 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. l93y dd)n3pfwWhat 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 frequency l+pe 82pbzsa( nu9q3qvwxz(c) )t)rg of a musical instrument. If thlxzu e sg b+)9tw )(aq38qc2prp(z)nve tuner 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 sou/e1rw-(h.;kcth h) rtjpt 7 aonds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sr/tew )7 k c;t a-ph(hj1th.orounded 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 stringw+a0jmps;e- ; u n6a+e9tzhros 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 tensewz0onuj;;e+s r9 hm ap+6 ta-ion 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 1nwdvmg08v b hh28r9x:000-Hz sound source at twice the speed of sound. The2vmrx08dv n9 :bhh8gw observer 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) approaches a stationary efy9 ce l)a2rjo+jsbw bpl7)(m*+v,mobserver at one-half the7p jlmlje b+)fysvom wea2,+*rbc)9( 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 +05 5y *edauk xcwl9t* mawgr-nd7(idcq0. qllistener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (Theg u+*e.*(5kddtn0x i qa0qlw5am-dcrc wy7l9 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 traveling at 35tcvfd,jh06 4p m/s on a day when the speed of sound through air is 340 m/s. The car apprt6fjc, p 0h4dvoaches 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+bkjl,eq (j 4a when a train approaches with a speed of 30 m/s. The frequen+e,jk4abj ql(cy 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 120 km/h. The train blows its 400-Hz whistle3eqkkn- 4x2jq.- qek3j2kxn q4 Take the 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 stationarad8op i9-omi ni31r77jnr, fty train. The train blows its 400-Hz whistle. Take the speed of soo7r pijfot,rni 9a37mi- nd81 und 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 405d (mashp6kp .0-Hz whistle. Take the speed of sound to be 340 m/s. W.5hpmdpa( 6skhat 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, and yot5us r6u u6hd;u hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency o56h d6uu;u srtf 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 ; 9cdr) gzz.kb54bhwd7h9j q rspeed of sound in air is 340 m/s. What ibw79)4d.b kjh dzg;rr5 h 9qzcs 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. qp y2t3z36jb xAssume 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 with2z b6xqj 3p3ty 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 of an object. A 40-kHz signal is sent d jq umt2iy37v/bv; y.out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How/d .2 j3;q 7miuvyvytb 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 a0jfu5. .i l sqvn5g.uk supersonic 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 M 8kna4 4h3sxztach 1.4. What is the half-angle of the conical shock wa x8z4nath k3s4ve 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 from the United States to Europe with ah)qi9)h epnp67 :77 yhew0ku var zz6a Mach number of 1.05 where the ai6:h h0 v kha7pw)7ze 6p re)yz9aiq7unr temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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