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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/asm,vgii qb79zg z75 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 conducte)lb6nze1n+ yc, sftsz .ke4d0 d 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 off u,)v,h3ld 0hgakwuu- x +/il 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 increases, what happens to the velocity of sounb fdw)o/tof./u e-ds1 d? (Assumu./w-d )s obfeo 1d/tfe 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 w-t06lx y-b p r.e3qzbhoqn75of a 400 Hz sound, the velocity of a 200 Hz sound through air izxoq0w 3p-lb.tq7-n65 byh er s

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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 2v /; 16sbkb9ea1wi mpgjk5m, p00 Hz sound in aikaisjv/bp;b1 m 1p5 ,k69mgwe r 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 frequencih)8nj7k6lv2uo9lbcro0 p bi )es 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 calt .pmaed+f3c4 ys)d*oled

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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 allgi:u+nf(8 ero ma1pk0l :oqhhc*,)ug directions. If you move to a point twice as far away from the source, the frequency of the souahc+h )pe0:u fgl:q m1goo8rkun i* ,(nd 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 prog;q t-ord -4.fu/kh njportional 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 kr 79 v79rvykhc4a up,rp2ir+is I. What is the intensity+ urcir92 y4r kp7hp7v9vka ,r 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 radik + lwho*7ntw:w xk;pk2f67xlpz g3 .iating equally in all directions. What happens to the intensity of thel : n6 wlkt7px w;hgf*o3wkz+2ixp.7k 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 radiatibhnbt- 75, buq ,cn pz8sfu*gi*ls, j;ng equally in all directions. What happens to the intensity level of the s,q,h,jt s*n -; psn*b c8b7lbgfzi5 uuound? 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 as a sound becom0.tum0 x 3xrhbes 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. Whatz g+mcd4dph3a22f1cphm2 wt, characteristic of the sound incrmf aczhd 2 mdh2+wpp2cg4, t13eases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" ofe6rbt/ 60fj ou 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 "ph6q,ewpmv/l-+ hq(b4o tc r5xitch" 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 fr(ybfwgeu3x+-c f8zv 415xhxd om air 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 waveg o5w;nhx;*mngkx/5ws 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 stri 1g qw2qdpgk),(l0hzzu2z 4fq ng and the sound wave generated by the guitar as a result of this vibration. Whq p)wqkz(12 quz,24df0hlggz at 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 opet k;9jkvn al37cnsg* 8n 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 z4vzq/ 5p;wfqof the three lowest tones produced/;f5w4 vqzzpq 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 i( s +6 m,yhm:+oexgpicg iv4x-n an open pipe of length L is 200 Hz. Which one of the following e myo+ ,(csii4:+pgx-mvhxg6 frequencies 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 resonat e33hriqyo fs lsqh 1t6*+)cuykp o24)ing at its fundamental frequency. Which statement i h q62or t3i sfq4+ls3)1cohueyy)k *ps 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 o+wu* h.. nmmb av/yvb.ne 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 ar9npqnc 2g;w n.e the wavelengths of the three lowest tones produce 2gcwn;pqn9 n.d 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 Hz. Which ooldx qnlri 1oboo, y6l438me4-l bmt()8d+n sf the followilo) d 1d86x o nyb(mr3lenll 8bo,qmso4-+i4tng 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 aba;2 2f/ m8tv*vau dtft its fundamental frequency. Whic*v afd8mv2bt 2/at ;ufh 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 sour,m /zxs5 whtv-ce. Each speaker produces a t 5zth/wmx,s- vone with 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 twp7owp q ggq38oq n :pg993uw4yo 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 parti yq c9zynr;*: awrd8;vcular beat frequency is heard. What happens to the beat frequq9 ydyzawrv;*c:;n r 8ency if the 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 exssv 5zextut0y .z5: *jplains

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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 obsertofv d(0,-q(7e peu nm2ww 3sjver. The frequency heard by the obserp,(2n d7 teo umj(3fvwwsqe0 -ver 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 observ k+gu1l o4f:gxer. The frequency heard by the observer ikufgx1o :g4 +ls

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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 2+c*r ao:xzt;yj zu 3idg2vk0double its MACH-speed, its half-angle will decrease by a facto0utcaozrx 22 :v;i3 +*gdkj zyr 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 ultri*kax8xo,* v .: ropqnasonic sound of frequency 45 kHz in air is 352 m/s. What is the aio,pxnka.xo8:i**v rqr 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 t *3:a*t 2v txiu26phq gm3q+u ydscb7nhe 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 bzk k.irhz9h5 9at emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the k i5.9z hhrzk9sound?

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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 temperatuxo(:pfvxkf 4n6i,e / +3ftmvi re 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 d,u.k+c1f) ny cepetb2 istance to the lightning stri)cpck, fnyee1t.u b2+ke 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 pysc)5 bg4i4r 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. Howdk (j gdrf1/x) deep is the well? (Ignore air resistan/kj1r )xd g(dfce, 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 of a sound wave of frequency 500e3geh;p zdhg5rve 1 03 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 an6qo k,pqtco -ks +v9ttwb -2)nju2s7ir 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 inten/9tt0jm jh 8vo(uo/h bi*2 iaasity $10^{-3} \; W/m^{2}$?

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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 sojc nd5x/ 0lq2hv,7k qound?

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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 levels of h;y0a 9mm7/g:ozp zgm9 i2p sd70 dB and 40 dB2h9isma90z y gpzgmo/ m;7dp :?

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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. Widn1rny; mj6vj ) w4x:hat is the intensity level generat ixjdmn)4;wn6 v:j y1red 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 equido)wxro. 9),q7,p gkne;h xhally in all dir,x9 d)r h.7w)k,hog oq;iexnpections 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-hqn;tc9r 3 jiul *.ev of 6.0 m from a source that is radiating equally in all directionvc 3.tu9q rn-i*ehj;ls 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 pjefrwegwp(23 oi0 jak,e*n- 3ower, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distkp, eow3ij eg3*( w-jearn0f2ance 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 m from a barking dog. What woulj15,u9vi01 w0 znaal mh;zqhf0tr2nj d be the intensity level if two identical dogs very close to eacfnur1vn2tz1h 0mq0l 9a;w 0ji hjaz,5 h 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 0fx *-v/jrywf 60 dB. What is the intensity lev/vx f* -rfy0jwel (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 levaqfyezunu9ysn kp+5 5 d523k8el 5.0 m from a point source is 95 dB. At what distance will ikypz9q u5uk5dfe5s3 nn28 +ay t 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 tone has a frequency of 1200 H*0by y-rzl3wn k bc3w0z. What is the frequencykwnry-cy3 z 30 b*bw0l 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 third harmonic of an open pipe is 900 Hz. What :hhhxgk)*.hve y: s 4tis the length of thsy)ghh*h:kt xv. :e4he 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 o;vizc 7n0b ,ejup qlf+a7r9kwwo8:2 ff length L is 400 Hz. What is the frequency of the lowest tonl;w na8 cfuie:7b+9rkqo ,w0z27 fpvje 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 gvrvtu) v.+:n length of 0.80 m. If the velocity of sound in air is 340 m/s, what is th:v gvvur.n)t +e 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 pv 6y3ly b 7:urz(mdy3temperature 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 cun v4b:fyx+m( losed at one end is 330 Hz. What is the frequency of the thm(:y u4+xnfvb ird 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 closec2+s h bhnb0y2d on one end that will have a fundamental frequency of 60 Hz on a day when t2nhbs b ch+y20he 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 temdkkhw3d1* q3v perature 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 where the temp u+y5q bgcb2yj*la i+7erature 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 plglbiys5s3s6 *2c i/4n 7hlz mpha6q.u4 dmag4ayed when the speed of sound in air is 340 m/s. What is tplm44qizg7smcd.4*6h/ h aiu2 a 5ls3nsy6bg he 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 on8)k4pjrd2dp:ya t l/hea0g .3f/k r pye end. If the fundamental frequency of the open pipe is 300 Hzgkd2ry) t8/el/.dj 0 3pphp:ar 4kyaf, 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 air where the velo hkcko:amla +g u30-0hcity of sound :a0uhkcm+ -g3kl0ao h 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 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 79dtnxc ,jb8e-r q/dbfrequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects litnt7 q cd89x- b/,ebjrdtle 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 beat frequenyse b9*7m-syrcy?

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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 of a m*xd g8z9d7i gg)ambz3 usical instrument. If the tuner hears a beat frequencyi xdbdaz8m)g*z 7g93g 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+c q v,yrwxe(/ horns are 6 m and 7 m respectively. What beat frequency is h v(yr+e/,w qxceard 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 violin strings on two violins in an orcj-hec 7)kkm4 shestra are found to proh 7jke-4 ck)smduce 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 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 soun6f/q 2c (osdwz81kw 1bva a6tad source at twice the speed of sound. The observer hears 1v8tob aaq(w61s afz2wd/6 kc 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 observer 5 nzk( rlir4x4at one-half the 4l(xrn5kzr4i 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. I tx+j a 3 r.dz(jrd9019zuhwatf a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound s9t 0jrat +r3wazx19hz (.duj dpeed 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 a :yb,)xju, iloz k8u4f tgh2/pt 35 m/s on a day when the speed of sound through air is 340 m ph)2,kf,by uj4 x/guzti o8l:/s. The car approaches 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 he /;i 1haq/dbpn-h2 ichard by a 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 of sound i/ n-h/;iqbaichh2 dp1s 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/k z:ye kf x0b6/m nwo35t8vt6mh. The train blows its 400-Hz whistle. Tak 6z:f/vom ne3tby8k5 mtk06xw e 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 stationary tra*l1skl kd66y ain. The train blows its 400-Hz whistle. Take the speed of sound to be 3d aslk*61ly6k40 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 ld *e.,.6 -0 lncclne(5;ern1m1ritquvfkky 400-Hz whistle m 5t(l*vk; rley.1edinlkncq1n f6uc.0r-,e. Take the speed of sound to be 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 away from you a5 e ,j+gb,ncsbn 4q(er.iff:st3 rc: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 actual frequenc.gqrr fs:c a4 ( s,cbn:3nj5ef ti+be,y 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 airww:g/8 v l,89upwqof k is 340 m/s. What is the frequency heard by an observer if the observer is moving away fgq9ou8 l vf8wp:w,kw/ rom 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 spee em)t0: gnuwwf8e8v5; eekio2d of sound in air is 340 m/s. What is the frequency heardfme eonvi8tue;2) : egww58 k0 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 speedqz1 xf805sec7; - utcfghdn0 s of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 34 ch;ndc qszt051-08s fxfeu7g5 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 sh(zme 8-dcp b55/keodcock 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 isv :xwq hd/ p3se ff6fn3qy*9*p the half-angle of the conical shock wavf6:q/w*hfxnsf d3p9v* ey3p q e 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 Urr*psrkm( hyzs7k-/ 5 nited States to Europe with a Mach number of 1.05 wherks/ yzrm*r sp- (hrk57e the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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