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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://mail.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://mail.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 faq 2 jz- 9ktcnmz97rn(vlse 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 through(eyvv2*oslficj37 y)um7 v2 y

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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 s,.,mm/;m ;ivm4qx) w,rtgclfqzfss 2teel 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,tvk4 /mht+d0e8hd rb( what happens to the velocity of sound? (Asst0( v +/hehdtk bd8m4rume that all other 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 40zbw.vx 5zt f/p8i5i rw0b0 mx/0 Hz sound, the velocity of a 200 Hz sound through r0/ zzbtxxf/w.i8550mvbi pwair 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, ther+u ntduyqq a gf 4.) 6ct7e;9b+0tpli wavelength of a 200 Hz sound in airf. et4+rt 967nylt0ab;u)u+d pqic qg 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 ki te830gv9b tfrequencies 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/sz ak6bg:5bcejb (g4equency 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 sourcpv *dqm nbl6xz 16 u27r6awfq1e is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequ 6x1n67w mruq1pal6fdqzv b* 2ency 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 proportionqh1h4 duw u.j(neky ayif+a)0g7 zm9qv 0*k8nal 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.x4 d euqst1w6 d from the source is I. What is the intensity at a distance 2dw64ux1.q etsd 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 i 2ei6wcro-(ba sound source that is radiating equally in all directions. What happens to the intensity of theciiorb(62-w e 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 radbfzxly +z;7.fiating equally in all directions. What h7yzfl.xb;f+ zappens to 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 increases 1n5ibxgfaa8rw( k-1ea8h5e n 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 chvm2yl1/kn nm ,s-o w7mt zj;-cf)ds/ iaracteristic of the sou wi/cnzojd1tm7l-m2/s;s m f, v)kny-nd 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 musical03 5tl-z- ysiy, dq p-ida15 mq8crsko 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 musica6jgkg-:qckld6-qind2r *+s8 mv 0akkl 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 aclug4yzk00lm a, 7daokd h+, 0ir 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 displacement w.6ok(4*r b/ndjtcl0wzg r0+ jj)ni 8eb q g9hmaves 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*vo dte3,4u a0dl2lc ge sound wave generated by the guitar as a re*0 d ,gel32t oadlvuc4sult 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 whichu)fp 5x37lss ei)q4/ tehe:nf 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(hcnx ( u2 c3ev(nrsnqq2ii-0 lowest(- h(c 3 qi(nv20nsnu rqxe2ci 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 gsm9 k8o 8k gd(rpg 4e*mfkt0(is 200 Hz. Which one of the following frequencies wilo*mtg(r8 kk4gf98gedk0m s p(l 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 resonatil0 lhohce)et*7frsf6 4u7q,q ng at its fundamental frequency. Which statement islf tqchulsef)reoq7h*704 6, 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-()u pq/ ij m)mqs,hdl 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 the wavelen * zezm2f47hi il7)pqrgths of the three lowest tonz7)iie2zhq mf4r 7p* les 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 j;3b0s si0amv Hz. Which of the foib3s m;0js a0vllowing 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 a(w6e8/t wrqn r16 r8wwr (empend is resonating at its fundamental frequency. Which statemen(wwnrqp86 twrree8/6wmr 1 a( t 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+ic+ .va52phi)shqb5 f3k s cu the same source. Each speaker produces a tone with a frequency of 200 Hz on a dai3h+c p25hs +sci kf.qvb )ua5y 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 soun9 dzn/n(on jpt n0+ /rzfba8c-d 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 togeeg o* ju:4zw(6py i1tcu3i :ytther and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one u*6wyte z3i (o g1ij::tpc u4yof 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 explains w0.7 egz(rvg( jnlv.q

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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 h+ :c t-.tni(-i oeqsmacla95by the observer +h-5a i -nset.m qilc(ao t:9cis

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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 observea69 a .bqb+hl;f+u vvkh 0qdt,7h-arzr. The frequency heard by the o+9vqr 07 ha+-k,t.lbhb qhv af d6az;ubserver 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-spee4ggqb/ t45byzpms 7 /id, its half-angle will decrease by a factor t q4i4 /sgb/gz p5m7ybof:

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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. Whemh9n ogx42) 0m;mmyrat is the air temp;0m mmhog 49e)nrm2x yerature?

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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 ig*g/ jxmi;hc gku qtuf4n3t*f2 7b6g,n 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 w,k f2dw3q z;c)f inq(.o5feokhose ecfkw5don,efqkz(2i.c)3q f o ;ho reaches it 0.0250 s later. 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 4lh dg/j)a7-v3ytcb /x .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 z8ymf(8r+; t -fta-i i)f f:qjdzcpy(after seeing a flash of lightning, the distance to the lightning fq-i(tfdmap8t 8+ic;: yzz( jfryf-) 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 agf,lz f9 ztkzqd.fu7su. k:5- 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 splas 5s4*8pn ct*wbmg7loyof(ub-q9p2b oh 2.5 s later. How deep is the well? (Ignore air resistance, and (2 ps94qct*nu7o8mywobfob5 - bl*gp 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 wave fpelc08 ptyr/;z8 h8n 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 akic rx16ft5.e f1 yd.uir 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 (r;gxuo5f6uac86 kphintensity $10^{-3} \; W/m^{2}$?

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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 2,t(jxgqp m;)z pete 4a 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 souip bwi+4wpl- x(mo:l; nds with intensity levels of 70 dB an impwb pwx4l: +;lo-i(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 et7r5saimm;jsg ;- , ly1 r7qigngines in a garage is 100 dB. What is the intensity level generated by one engine ji7 1l,;q5gm a;7rs mrtigsy-?

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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 qah 0f/jzy f0.that is radiating equally in all direction/ qz.0 fhjaf0ys 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 kbuw2d,77n)rbhea k ) from a source that is radiating equally in all directions ie7ab7kn,d2u h )rk)wbs
$6.0 \times 10^{-10} \; W/m^{2}$. 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 to w+nul9.)m rk3gw3xvu7fbkq,5 tz d i: be uniformly distributed in all directions. What is the intensity level at a distance 5.00 l m5:q3bwdu.3 v wkz 7x 9gu,ir)fkn+tm 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 diz5 bdezzbd+p ;rf/ s .a*l(shwf( ;mg:stance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very c wf:lsz;b5 mh.z(z(frea+;/pbs g *dd lose 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 soufdkj:08 5m5ugit tj1 tenuh,*b w,s)nrce the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assujnj, ,f)5k8h umtt 0:tubn e*5 sdwi1gme 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 distanjcrqmn 7 /8g+oce wi/ro8jc+m7 n qgll 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 q4m1/n : q)t,sne 2b3wahdim ztone has a frequency of 1200 Hz. What is the frequency of the fourth hwnh1ze:3b4 2a /i qqmd,t)m snarmonic?

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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. What 3yiwe)2 /ekm jybr.0lis the length of the pipe) 0rijmebk3/. y2ylew?

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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 ly7w k5v8 kbu8zength L is 400 Hz. What is the frequency of the lowest ton v5ubkk8 7z8wye 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 haext-eq ,qus 52s a length of 0.80 m. If the velocity of sound in air is 340 m/s, xtueeq-q2s ,5 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 ; quya7 1osw*cm;fx z-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 330 Hz. What is the fr)az6oao*t,s7aihs, d eqad,o7,a )so6s at*ihz uency 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 that will (-jagm : gj*tqhave a fundamental fregj * j-g(m:qtaquency 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 the temperaturi3fbdhp-:d qt8oq8qo qz8 5 u -4l,uhce 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 is3szm g5 ;ksc8v 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 b*. 8 /1jcop*vo)t d di2inguqspeed of sound in air is 340 m/s. What is the fundamental frequenci1o.b*pddgqut i j8*c2n)o /vy?

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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 of x ),t6tg:lyon one end. If the fundamental frequency of the open pipe is 300 Hz, what is the yl)x ,ft:o6t gfundamental 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 frequencym.p9h8 9 duqno of 800 Hz in 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 front of the sources would hear no sound8u. ond9qmh9p?

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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 of ;crkfi08bbjo+1 ,q ( ;ygvdmt500 Hz. If the distar (b kjyo1tf 8g0v q+bdm;c;i,nce 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 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 the beatdioo 3 ps856eb 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 fol4sb;8+eyur p0 +epgu rk to tune the frequency of a musical instrument. If the tuner hear;ps4g+ue0u+ y rbp 8els 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 sounds pryzuy a23n /yy-jepv5n8 6so)uoduced 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 velo5y 6y 8nny)ezjp- vysao3 u/u2city 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 strings on twozy:fe+tpv ; .m( p(ypp 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 +(mzpf y;(y:ppve.tp 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 1 r4s 98lvo-i7ccqt o *uml8a4d000-Hz sound source at twice the speed of sound. The observiltvqmo c -44r 8sa*9u87dcloer 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) appro3wgp8,pw 1 f87csj zdqaches a stationary observer at one-half the speed of sound. The observer hears a frw 8sdg 13pjqc,8p w7fzequency 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 3t5f9qmsj ,)t l0 m/s away from the s9fj),s lttm q5ource, 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.ewwodu.) f:r+mo cr331r- oz-fh 7qwa It is traveling 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 freque7ch-3-d3owuf. a eomq:rzw+rf wo r)1ncy 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 bn (l 2rbpcwfpvppi: /;n.e6*)+nwvplm bd 5 7by a stationary observer when a train approaches with a speed of 30 m/s.ve/f* i mrn5nd.b l ;pcb :p(2p6bn)vlw+p p7w 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 120 km/h.wqrcl: iu p/ y4,cci4;mx9v3r The train blows its 400-Hz whistle. Tayx3ciri9 4rlc4/ cmuvq p,;:w ke 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 stfd5)m tgm 4gx0ationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m5mx4tg gd mf)0/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 traiu2qfi 2y9 0udin blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequdu2q 2ifi9y u0ency 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 whijl681p /ciqq)/m tuzb.(uphs stle, and you hear a tone of 400 Hz. Take theiz(j ./pq s168hmuupc)/qb lt 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 5z7h71)il)y * ifi gnqa00 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an obseri) 7qg yf7ia ni1*)hlzver 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 somj8+lt b7(swdund in air is 340 m/s. What is the frequency +md7b8swtjl ( heard 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 of an qxlyci6*q0u,-g 0*yg sn el)m 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 object movqgcy 0lg n mu)-yxq0e*i*s6 ,ling?

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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 supersonic aircraf 67l7jbl9lmslt 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(h1uyzoi cxz8by-g.o1tb z64r (gv 9e of Mach 1.4. What is the half-angle of the conical shock wave formed?11xz e6(9 grg-obziuco( t.yhyvz 48b

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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 Europg*vt6f.7v,rrux0mx q q7e+ c le with a Mach number of 1.05 t +ecr 70vv,mluqg x*67qrx.f where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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