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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://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://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 statedq*ag : jb8 o5d 2es/ycr 28fn2yo6juwment?

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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 conductjnigeu p7t)s):j8h j) ed 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 ste/8hbk oho nt:r y)9(cbel 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 increasgg 84v6 pddn*xes, what happens to the velocity of sound? (*dg46p d v8nxgAssume 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 velocwyz.:9 1ne *y,dbd3lnd ezau:l w +ey/ity of a 400 Hz sound, the velocity of a 200 Hz sound throug.blyla :wzny+dez d*e e3uy1,:d /w9nh air 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-xf0ga0vr 93njkg uf kr0 p2c6 400 Hz sound, the wavelength of a 200 Hz sound in air isf kfr jgn-apcru6gk00x v039 2

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencies greater tf5, oqpn0z1kg han 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 u2yjd hy6d t9+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 direcn;mj *u,a5b-yq, o byxtions. If you move to a point twice as far away from the sour5, ;bo jx aynmy,-*bquce, 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 propo s*mo;*v7ypk9lzqxn .etdwhb*f) 4g0 rtional 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 poicm.+dfk nm- s*d w;xy3b9/q cdnt source at a distance d from the source is I. What is the intensity at a distance 2d from3 sdfqb9xk *d mw; /dcyn-+mc. 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 equallys/lohx; yjev k:5p(x( in all directions. What happen(hx j(:ps; / 5lexyokvs 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 9n37b lfltz es+.ie+cequally in all directions. What happens to the intensity level of the sound? It drops t +n.sb9zelc7 l+3ei fby

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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 osnbaq/v f0a2(yz .+63 6vdgse yvnc,al+8dxa 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 characteristic oh fzscu *l.p37q ebjaoq3tm*8v8+ bu9 f the aqs+vlu*qm8h 3p 738 ebo. uc 9zj*bftsound 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 musikg d0tb,8p52l m+l1wggi jti(cal 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 musical nolw*j2n9) k8 dj2qsrpd 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 in2orv4a.n 24wu:mk d mvto 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 waves areb:ox3lj8f xpx)xub 4 9k)yze3

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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 b rzamg(y0i, 7gy the guitar as a result of this vibration. What d 7r,zmg(g0yai o 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 v 1d txus8w21mic,w o/which 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 w4t r9wf, kz*tvavelengths of the three lowest ton49,vktwrf t*zes 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 resouqgn x8u45 a(a r)l yg:)g7pqenate in an open pipe of length L is 200 Hz. Which one of the following fre(:4agnq ylauq)7u8g5gp )rx equencies 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 freqqso) y1qf7tgi:( *b00gi )o5irpwp9a ndoc 2duency. Which statement is i2)gbwiq t5 yqdcor0)9a0 1n7ipgopf:(do* s 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 one end and closedyzv( b5u6 o7qv 6t2zts 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 e43bv+land + o 5syc9mf3b.vuof length L. What are the wavelengths of the three lowest tones produced by this pip+.n9s 3ofb3 ume yadbvc+4l5ve?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 reso)-fvka5x/f2j 31ny j /q skpfunate in a closed pipe of length L is 200 Hz. Which of the followinva/j ff2s3 1fxnp j /-k5kqu)yg 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 resonaos 6mo7z 1fc9eting at its fundamental frequency. Which statement fmse96o z7oc1is 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. Each lcxtb., *b - 19 jkn83jyd:prgi(icxvspeaker produces a tone with -:xp89jrt i13,vjnxc.bc k b*(lgydia 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 souyb1- vurp5. izt-4(xximg )tj nd 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 frequency is heard. W.gvv9- *6t4y f0u ti9.zpq1djqrmxr hhat happens to the beat frequency if the frequency ofd01p -mt6yqriv9v.hx9gz*q4 ru . jft 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 expla.1xquq,9l9 lx-g2fvcji ) opeins

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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 fw cs0x*: m ilqkl+w7y7c.al i8 /ewp/drequency heard by the obsqis0*l8:m k7p/w. l i+w7wdlcc x/ yaeerver 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 heard byqv6 fszp b*d;5 the obse;b *f6qzspv5d rver 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-speed, its half-angle will decrease by .0 : bd4kurom2 rs)weya fas 24or: urkw.yb) 0dmector 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 pei zt*c ihg92shba.mh64 r 4d q3lm5:45 kHz in air is 352 m/s. What is the air temperatu3c9ih5 4ltq rh2.d gmp:*e z6hism4bare?

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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 o +zip,t4zjlxyt+n 7j0 9xg-a 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 emit cgfa 1uc*dxt09r uoyhp4o4,(s a shriek whose echo reaches it 0.0250 s later. How far 4 ah19ox( yfg0 4rcot,cdpuu*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. The tx6 aj-k pzv/r-+b:jk remperature 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 ,x v5m77iws/riq/iny 8e1bg xq-n:xx after seeing a flash of lightning, the distance to the lign/1 q-nq /y:gei xw7xs ,v7 5ir8bxxmihtning 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 fhs9 agh4g*b5grom 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 theep.i/0y+x+ * et l )jotcc*tgg splash 2.5 s later. How deep is the weegc0*ep .t l xgoc/ jy+t*)+itll? (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 air on3eafbe0:z1y p(bl(b f 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 air at iu687qbv8agoqo8 )d ,xpxd+*mqd:ax y u s,6w $23 \; ^{\circ}C$ 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 lever kxl5d3t ;c*ll 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 70-dB sound?j7; jg 3etaka(./dpir

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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 lx+ysr763kyyg 7xs 2 vjevels of 70 dB and 40 j3 2y6 kxrsy+vsg7x7 ydB?

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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 th/es/ yxj+.z-;e zixmk)aj+y s e intensity level generasz/sa-/xexym) kyij+. +jz;e ted 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 equally lm*.gz etf k5i.d;i3z rw;hy1in all directions w k.dl5 z;rgfh.t*3i y1imez;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 sni2/wsd (hu s9ource that is radiating equally in all directiondsu/29insh (w s 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, which is assumed to qh0tm4odp*-w be uniformly distributed in all directionq 4 p0*twhdm-os. 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 a distance 5.00 m from a barking dog. olasti w;- 7.oWhat would be th7l o.t ia-sw;oe 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 f 3paq+c1.dvx, w3fhuh rom a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all direct qc,p1.3huvxa3hwf d+ ions.

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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. op433 orwbulbng274p-. zwlvrr, s/h At what distance will it bepbos , lzlv.34/w 37ur42rgn-brwhpo 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/whn ;peyl;r. y;-hb j frequency of 1200 Hz. What is the frequency of the fourth h/; p; . nel-hrj;ywhybarmonic?

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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 is2 qbrbe*phm) , the length of the pipemhr beq p)b2*,?

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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 op;(lu eu9 50ftntx .:d 4ezk4fw ;ayesden pipe of length L is 400 Hz. What is the frequency of the lowest tone lte as(n ty04 fz5exw;d;:kfudu9. 4e 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 length of 0.80 m. If the velocity of soj.z3z6-duxg(yhq 5z(/1es i:vqo utmunotx1(- .qjdv6 uzuse(3 5yhzgqmi / z:d in air is 340 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 temperature smr5n2 eb qcg9)4kg9wis $20 \; ^{\circ}C$. 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 zwc;j (um -at9a pipe closed at one end is 330 Hz. What is the frequency of the; j( tazwum-9c 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 w hc;h +,s2 3st2h,jvt4,o gmztkzcv6n ill have a fundamental fret2,2ctvgchnz,sm+; oh4 3kzv,6 t jsh quency 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 temperature is,-yd14 b q1wlyh g9bi(ns fgh6j(zo0i $20 \; ^{\circ}C$. 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 fsk+.gw ft3w-wba,+o 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 speed of sound;(44vkpi h mu z(;-y :mfntsaw in air is 340 m/s. What is the fundamentak im p 4:uhw4y-v( ;;zats(nmfl 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;d.kseh6s o y) is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the close;kso ydesh6.)d 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 8*1ktbz(4w ztj00 Hz in air where the velocity of sound is 340 m/s. How much farther back wo 1tz*z(bw4jkt uld 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 drrf,ty+cnw5 z0iven 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, which of the following is a possible the distance from the person to the other speaker? (The sound w5nt +zrc ,0fyspeed 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 frequenciesp9 +tnww l7)1bu +fcx9no4e (tx;kajn 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 tuyedp*m.6+2 twhc;kof ne the frequency of a musical instrument. If the tuner hears a beat frequency of 2myp w.2ce*h d ;6+tkfo 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 hornp/8o zzvp k/mh9ig(r al(nh:-s are 6 m and 7 m respectively. What beat freghivh m rn p (-(9klz//ap:zo8quency 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 violin1 1 tcmo+vqyi3 strings on two violins in an orchestra are found to produce a beat frequency of 2 Hz 1cv3 + m1oqtiywhen 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 sound source at twice the speed of s jzq 4 zgjdjx-h/n0npzknwp;6n6 :,4k4wq e 0uound. The observe 0zkdp gxnnk4ww0u46-pjen ,qnz ;j4q6:jz h/r 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 f rlv5:sd-6qarpn g;2k))exk1g l2khu requency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The obseug2rkn k- ;5lah) vl2xq6ps :ked) r1grver 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 wq;:4-cicwwesz2*z*)btid6/ co ero hith a speed of 30 m/s awcdw z:;)*c2 e/46b q*coerthsz ow-iiay from 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 ql+7 xpbixe 3b)bu.1osiren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car appe.b x3 1b)l+qiox ubp7roaches 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 vsw:lga2:+;ca ga;r x observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz xlgcr aa;: 2+;sgv:waand 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 by19a7n 1uyx b3p gnh)you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sounyu n1bx37yb 1 ahp)gn9d 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 train. The train blvp7pm )oa/ :rb)f 2vnnows its 400-Hz whistle. Tafn o7b)p/a :p)mrvvn 2ke 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 120 km/h. The train blows its 400-Hz wbit/,nnn wjl3qe6nz122 yd4p8.akl t i7 wk (xhistle. Take the speed of sound to be 340 m/s. What ,x( k iq.1wdbnw 72kt 6lne t8zip anl/3n2y4jfrequency 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 yo bpkg qw;tbwwx0 ;t54;e4m+wru at 120 km/h. It blows its whistle, and you hpwr 4twwx + g5k4bw; q;b0m;etear a tone of 400 Hz. 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. Assumh9 e.z7ag h7pze the speed of sound in air is 340 m/s. What is the frequency heard by an obse.9zpeahh7 z 7grver 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. Assr.3 s9stx4k, ,vgnco i b4sc7dume the speed of sound in air is 340 m/s. What is the frequency he,vs ct47,br3k i gscx9. sndo4ard 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 object. A 40-ktg,m(mpo)2m ; ae tam4Hz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast 2a4o tt ,e p(a)gmmm;mis 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 produa7h2r7iamqbx. ; vqq *ced 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-angle of tp hauz0; .5u*wnw izkj.kz5u. he conical shock wawi znph5z w a.uu*k 0.kz5;u.jve 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 a Machy uxs o2ibu(e) -sf:f1; w*x/js/60kttu sobp number of 1p1x-u 0f s/osw /*t6;sjos2 utybk: )e(ifubx.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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