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习题练习：Physics Unit12: Sound
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.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.5edu.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: admin  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 followii*uq no4g f+0km 945hsez+pzw ng is a false 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 conducted fastest thr/njuw a ggq 5ck/0k( 3*v2tjeuough

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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 ofo xdn xhsuez3 h7k03*- sound in 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 increas 6g8 *jejv7aq,tgxs+ ves, what happens to the velocity of sound? (Assume that all other factors remain cons8q,6v gjgxja +*vst7etant.)

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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 4murhh aegc8 ejl+ al(4 z9ywvvj,(*4400 Hz sound, the velocity of a 200 Hz sound through 4j,4w *ul4m 9y( c+zh(agej levvrha 8air 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 s7ghssaf7:s vi0tu6i -caxxd7 -((l5fude. pv ound, the wavelength of a 200 Hz sound in air vil dx. du0(vaf 6uise:tp-a7cs s 5f7g (7-hxis

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequ vdl93)ky(m gpencies 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 frequenczw:(ht 0l3b-mfd sc 5jy 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 uniformly in all dwp4jwq.pk,cd 85qul 9 irections. If you move to a point twice as far away from the source, the frequency of the sound 59pq4 lpju,qd8kcww. 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 proportionan19 kn q.exuc5l 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 xjoje;; x/hi47ipi n6I. What is the intensixo 4jehi76;xji/np i;ty 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 rao oc;/hg/utf mi k.ta c)jum7:; :njb0diating equally in all directions. What huom.jf :t/;khgm0c; b t7a:ijoucn) / appens to 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 distance from a sound source that is radiating.nys93c m.vs v/*ut a3b3 rfhm equally in all directions. What happens to the intensity level of the sound? It drops byfs3 r/ . n39yvm*svc.aubt hm3

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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 ink pw1w k.3zn84t prj)ocreases 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 emitwt jiiuz/ ;c;ya7l6b:ting a pure tone. What characteristic of thil; : ycw;76aibt/zuje 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 a musical note? aij.0+r1knu:kpw - pp

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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 notd+t r 4f,r0h4sm/foq te?

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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 watetxg 52tdwgjc l0m+o 0h6k4b ;zr

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wa9p(rptup h 4r9fw1w (yuno+g8ves 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 sound wave generated by thx 1hjd1u l-(cl/guj1b w3ul4 mjwl1j1bhm (34ugudxl1 /-luce guitar as a result of 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 at both enfs jzqboha3 :ei3,g6/w +:owz ds, 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 lowr2fkg*w rk;: iest tones produced by this prk*frw g;ik2: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 open pipe of length L is 200 Hz.1lg+0bw3my+ -hbzr ci Which one of the following frequeniy+m03grhb1c-b zl w+cies will 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 resonating at its fundamental frequencymv ii slmf7q:(2* mht)5l if7x. Which statement is 7)(x7 qmisht25 mfii:fm lv*lcorrect?

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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 they*mh5 km.hm 5m 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 of the tqceiu0u9czl7l 4g3 rp(sv xtg/ h1;w+ hree lowest icuw u+t31lqzc vpsegx9(r ;7g4hl/0tones 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 mdcg* vp+vv0 ymh.eck,o 1*xo .59ysr200 Hz. Which of the following frequencies will not resonate in that piv.c 9m ops0kego5x hdv mc*v ,+*.r1yype?

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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 fundamental fuimf :g7d: djd90 2rgfrequency. Which statement f2gr id dgfmj9ud07:: 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 twoal rv0tg h/,rtgw.k1 9ib3llt/r.sq9 speakers driven by the same source. Each speaker produces a tone with a kqa3h l/i w b1tg./09 9tgr,ts r.lrvlfrequency 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 waves should4f y0s5uk osn1 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 frequency is hi di(ai4f.z8qeard. What happens to the beat frequency if the frequency of 4.qz i f(d8iiaone 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 explgm0)66 gyc c )hnu7cfdains

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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 ha a5pu q0wg(s6eard by the observ upq5a0gsaw (6er 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. j)e9)f l fs:gq dwys+/72wwqaThe frequency heard by the observer is )lfdwjs2q :syg+f 9aqwwe)7/

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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 decrefc;is8 txc9 d hqp6 )bikc(+ et2y1df9ase by a f x dhd)16+(2ifkiyef99qc btcs;c8p tactor 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 ai /r0mf p0klhom ):9hqtr is 352 m/s. What is the air temperatur/kl)9 mfq:0r pmh0 othe?

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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 q8k:kd v x7y 47sndys-)1jr8mko: iqqof 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 cd5wuv,est3/28g 9onmlh: i b a shriek whose echo reaches it 0.0250 s later. How far away wan,9h58mv el gudo2t:s3 /cw ibs 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. The temperature is 6dhw5j9.o f3ko;pcgg$0 \; ^{\circ}C$. 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, t5 (lqodo9sj nd8gz4zk0 hk;*hhe distance to the lightning strike i;8sloh*zk4k j5o( 0dd ngq z9hs 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 l cnxrj5sk11* opfi (6d )j,vfs 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 later. How deep lf1d wr9mhnq siz-5lf f5//u4is the well? (q1lin rdl5 fhu9msw5f/ 4zf/-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 airu.ko 8bq0aov -+il;vu of 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 aiv( p1eu.rwtz 5et ha90hp*easq)a2 ifm7+3agr 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 intensitg.:a l;5pcx(oy y lafl:tm5 *my $10^{-3} \; W/m^{2}$?

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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 4*k sfv18kcz7j.ofh4pcnel3sound?

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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 leve9 4nq4iub4bp)xqf1 pa*g; sej ls of 70 dB and bpxajf*b4us n1;iq4) e 4gp q940 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 dB. What is the intd:gna,so 2rppu. 7n 8b5 3epxiensity level g.n rp,gi27ebnp pxd8o:u53 saenerated 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 thabmd scw16s* mn q,v1z0t is radiating equally in all direction60 cdsbv1znq* m,wm1ss 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 a3uv hz0oxg1n1 source that is radiating equally in alu1zh1vg n0o x3l 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 aboutq5r2 hmw4:jos inn./9zh d tl- 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distanc-5h z rsnltjh2i oq./n:9d4wme 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 3e9m84lt/kqdtl7 m 8pbl ev+jm from a barking dog. What would be the intensity level if two identical dogs very close to each other are barkit 7+3etdk/ ljmpv849 b8qllmeng?

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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 dBfrrnoh/ e5r09 papw),. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally inpr0wa, / o)5h fn9eprr 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 poixj)j bvt zvjq1ig4e 9i4w2n 94nt source is 95 dB. At what distance will it be 75 vzwb2 94g44xe1)qtii vjjn9j 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 frc*rszf2y k3go6fjqtjn -21.vydd - aaz698ia equency of 1200 Hz. What is the frequency of the fourth harmonic3ran2o 6f8jv. czfgj21- id-6a sqdyztak9 y *?

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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 thir+2xg2vtja0 rzd harmonic of an open pipe is 900 Hz. What is the lengtgrj+ 20za xtv2h 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 oz: y(o:w /d:4iepuj +li-cil df length L is 400 Hz. What is the frequency of the lowest tone tha:dc4-yiilu+loj ie/dp:(: wz t 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 h 938nm 6g5;pd jxeeq/)vsu5kx+5zblc4 o regdas a length of 0.80 m. If the velocity of sound in air is 340 m/s, wha bdez gd58 x5g;35vj+eousxm 9cn6)4kp eqlr/t 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 tem.:tffze yol51b;3e-z rd+edpperature 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. What *d r33p he/a*xumq t 48vo2pjdt75c msis the frequency of the third harmonic?chm/ea47d **3pjq3tutr 5 2svxo8p dm

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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 shortes6;m ;x chgzd: pte7g-wt pipe closed on one end that will have a fundamentwzmd 6e ;: -7;gthcpgxal 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 is in a room where thenw3:g1enwa pt5 .g7 gpmm(1p.iy h4ze 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 v wuj 1z2zah.lt8x- .mroom 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 i, m)nfyf hb.7ks played when the speed of sound in air is 340,7fy ).nh kmfb m/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 loq f-, 42fcrasength: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequenc4 fc2o,fs-qar y 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 a6z(mnn +9; pnxw1dbfn ir where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so axp+bm(9n nw16 ;nznf dn 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 sid)5 urrp23qy; ,upvmere 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, which5qprreu3;p yrmv) 2u, 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 anrpj y z*wn(1/md 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 ipbk:k3s: y7qqqz;w /fork to tune the frequency of a musical instrument. If the tuner hears a;qqpy3:bkq7 wiszk: / 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 sounds produced by two horn xggn 9pz;xm(q+v(:v rs are 6 m and 7 m respectively. What bear9xgv+gzx :(p(nvm q ;t frequency 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 violiq4:k mx-vw:u hyw;j/a n strings 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 would bring them to the saymka: wuhv4q -jw/;x:me 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 souao( *oku d i-5wnbb55lnd source at twice the speed of sound. The ob- o(l55 ob u5*dwiankbserver 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) atta m8.k/ t89 )zhytljerd-* lpproaches a stationary observer at one-half the speed of sound. The observer hears a frequency ofe-t*98k tm za lth/t d.)y8jrl

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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 8,xq7 gwn2ioyx (o y0bof 30 m/s away from7yw b(0 xn,82yogxoqi the source, 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 siren4o1 cvqe 0l0zb2qns4y. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approv1e2 so40zylb0q 4cnq aches 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;mkh3hp j :2 ej2iddy8 by a stationary observer when a train approaches with a speed of 30 m/s. The frequeih8pd 2mdjh3je2;ky:ncy 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/hfdtbc*ct yg, :+c4l/v, 8wxrb. The train blows its 400-Hz whistle. Take the spet8,4bcx, lfyccd+r:bg/ vw* ted 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 kz/tq0i2 lu;fonq4 js 6j5 6qbkm/h toward a stationary train. The train blows its 400-Hz whistle 5ub6n06 ; fqi4 qtzsjjo2qkl/. Take 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);m*wc mu 1lgezi;wx;uupb 2jub5 7z2 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 2 1*zwwlbu )mp5z;e2i7 uxg bm u;jcu;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 a*81/uwerfciqu.t+a b way from you at 120 km/h. It blows its whistle, and you hear a tone of 400 f/ucu+1*8b aetqi r.wHz. Take the speed 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 is 500 Hz. Assume the speed of sound in xo5n:;d2 ob vo 2poz:wu69easair is 340 m/s. What is the frequency heard by an observerx92 2ovbo5o :n wpeauod;6zs: 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. Assume the speed of sound in air isp;/rpq . tfrof0g9-siwcx: 5o 340 m/s. What is the frequency hea:5.op0rsog tqcxifw 9;rpf/ -rd by an observer 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 +2y i g2qdnqm3of 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 isn +2m 2y3qiqgd 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 coni pny zd.4*7 .9ivqe-upb:pltvcal shock wave produced by a 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 Mach 1.4. What is the half-n6jia ;;txcblkn5 w+3angle of the conical shock wave for6k3n i ;txjlb 5wnac;+med?

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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 b;pc rd j2;;yoMach number of 1.05 where the a ;;opryc jb;2dir temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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