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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 is a false statement4dxc - ttos:/e?

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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 fastr2u -ec zwab9e4i4t/lx a3nc5 est 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 srzd 2sp ;1h,.: xlsnplound 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 -y7lseeta; :uthe air increases, what happens to the velocity of sound? (Assume that all other factors remain constayeeua :s;-7t lnt.)

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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 52/zyrksxq s (a 400 Hz sound, the velocity of a 200 Hz sound throu z2s/x5y(q rksgh 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 400 Hz sound, thkn (nn0wep52j ni8*8-o /tpqbsyo2 rje wavelength of a 200 Hz sound in air n2/ nyp k0(o-ijqpsn8 rt8j 2bnw5eo*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 frequencies greayas:h ej 424-awhk ,jzi53dzv ter 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 caldo:g/ukqve ) dos-zsm x29-y7led

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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 sou(s3;/ omfbysv rce is emitting waves uniformly in all directions. If you move to a point twice as far bfmo(s/3yv;saway 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 proportionalrt/ie my11n)s 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 sourtx3 ojvu,* 0tj4 zpq1dce at a distance d from the source is I. What is the intensity at a distance 2d from the so,4 j jodvp tq*txz3u01urce?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distanm08 /k2qsorxom) a2r) ,sni*d8o b ayxce from a sound source that is radiating equally in all directions. Whaard2nos o) xxro,8mqy0m *ki8/2ab)st happens 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 equally i6ym tgszg. f,6n all directions. What happens to gts6 y.zg mf6,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 as a sound bx)p7ycm79j.kc o,xuswxyskk j- r2(: ecomes 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 characterist cm-pgmh+1;hm y vm,a(ic of tmg; hp+,1-h vmymm( cahe 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 av1fd9kpjvy35a4 4y-isy jnd/ 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 "pitch" of a mu *zaky-n2el6/oqdunh 9ebsx92 4k )j;l-d vm fsical 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 fros7*/vcoxdme (ru6pmrjh6 tt 0 u-k(n ;ks+ds6m 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 waves iclryvn7 l /ce7g3.,udrf(* eare

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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 so8 r04ixz bfyt:und wave generated by the guitar as a result of thitz bxy i:r804fs 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 ends, t o3drh:amqbjtgv t u 67q4 0l+ex-q/b-here

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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 lybv+ 3vjbjz;oaif ++, ength L. What are the wavelengths of the three lowest tones produced by this +avji,+o zy j3+b;fbvpipe?

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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 Hzrnog0r0k,eqvos 2 p-s*.p1x v. Which one of the follow or2v. s0pxepnrk* s-1oq,vg0ing 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 re3n v ,g:nys7jqsonating at its fundamental frequency. Which statement is corre,q7:js3g nny vct?

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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 a itcqhi 5w- ryav(3*qg,;yc(g nd 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 lengthynfkx;4gg)fsbz 2 0f( L. What are the wavelengths of the three lowest tones produced by thfsk g;f g)fnb x2(4yz0is 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 200o 5vn3epoh6. wm-j(b n Hz. Which of the5mjw- p3 evn(. 6onohb following 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 fundamental m0ti1m7kdu/)wpcr4(9nxw s o( cw.nxfrequency. 0t(4um.o7c( nc rmdk/ x n9piww1x)s wWhich 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 source. d 086uwu- zdhmb aq(b rfo4tp58r;e0e 0c flk+Each speaker produces a to4 bhwl( zak b d50fe8md60qotp;eu8rr f+0uc-ne 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,:depl8x22/dawv xj+ka*w 8 bh 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 i*rg m s82qqwkro.p75frequency is heard. What happens to the beat frequency if the frequency of one of the rwokpr s .8q7* m2q5gitones 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 expls ; k(ay4 iqjrr*g-5uh))nogtb 6eao-ains

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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 by th) -30wcq8 diwkvpp bl;6ryr(ce obserp-8pcd)6q0 3(v;rr b cwwlykiver 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 4i y*ft 1xdoyxu,:6 nia stationary observer. The frequency heard by the obs i:6 yy4ntx,o*1 xuidferver 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 by14x66 ,m: nlphd*lwwk0jmde e a fh,6:pmkjn4 dxew 6e lm0*1lwd 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 an isgz.az5x3/ 62)dkq xb9nyt ir is 352 m/s. What is the air temp5sqz 9)btny3k2.g6xa /di znxerature?

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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 spehr9vuhx r +nlyk1l (6(ed 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 speevrybqzp-yb*d af s9:/ rv(/.zd of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected bacz (/d spbvb:f/.*vryq zyra9-k 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 9eop.44 sj ev/skavdi0(qbo( 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 afteaokgy w8qv41: r seeing a flash of lightning, the distance to the li4 gw8avy:o 1kqghtning 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 a cliff on a day tex der.n-2sy oav,bbp ,0 9l8yhe 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 de/h7kk(kmf yos7f 3hw( ep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of soundf7(fhko kky m7 (3hs/w 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 frequencs.i/8qa ff2mgsn 5bi 7y 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 s8f3pem r 2)g0qjyo+yat $23 \; ^{\circ}C$ 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 ; zq)ujt5l.wm(ow aj ,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- 0acz8 -o.jpxhdB 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 twoy;i+hu , gp:cp9 nx3izw:nxv8o tkm64pei +c0 sounds with intensity levels of 70 dB and n8xpge:k ix o+hmt9:yz+p,c3w4i inuc ;6p v0 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 1z h6ruw9 4m rrvf-a0w;m87 upe00 dB. What is the intensity level generh8pe4;-97zmm afvwu0 w6r rru ated 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 in 0uv n1 kq;f l2ud* a-gnt9smyz6-7k jjall direc*yjnt 1zv96gu ma27 lu;j- fqsk-knd0 tions 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 source that is radiating eqq5u9 /pi nh 1kmvi3i(vually in a vip khv5ui9 q(i1/n3mll 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 delive u yr,rzfp/8x1lc8i,mrs about 1 mW of power, which is assumed to be uniformly distributed in all directions. What cx f8,i/ ,8rpuyrml1z 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. Wa2a/(-vyk taphat would be the intensity ltk- y/p( aa2avevel 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 aimo 5tm:7tas190 mt+/tf rgvp 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 radot:tgs9m 15ip7ft 0atm +r /vmiates 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 poinue 9s:nwn/5 ryre9 d*nt source is 95 dB. At what distance wirs ury 5*9nd/9:wenen ll 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 complekh p ,dy1n5ib0x tone has a frequency of 1200 Hz. What is the frequency of the fourth k1i d,5bnpyh 0harmonic?

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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 pip7v1i :y y7.lsd9qci:bcur:pbe is 900 Hz. What is the length dy: ibics . 7yvr1pl9 u::qbc7of 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 ofe6nu rv dw(h-/d i x,k7-dr.va length L is 400 Hz. What is the freq, ivd .7a-wn6dh(reru - /vkxduency of the lowest tone 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 enqd,+tnu 6ioha88;0wh e sn w p;5qthe,ds has a length of 0.80 m. If the velocity of sound in air is 34i8 , n;w a0ou+ sted eh5h6nw,;thqp8q0 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 roo ;a0gedff(6b2;yay fx*jkx )vm 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 gf ,o4 5c:,tu*7*tbxclthdmmpipe closed at one end is 330 Hz. What is the frequency : c*mh 45 tdgtt,f,boc7um*lxof 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 shortes qd)f63l qdir(t pipe closed on one end that will have a fundamental fr6d)dfq 3(lqi requency 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:sq126ol6 qpxgpdv+fox78ka a room 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 ijg/ynm 9(ibs:n 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 speed of shzhl,: -a u*s0b w+idoound in air is 340 mo dbw:i*slhza+ u -,0h/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 length: one is open +5 fosasqjw3, and the other is closed on one end. If the fundamental frequency of the open pipe is 5soq+asw,3 j f300 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 air w,f3vcm 3l33gtq; idl rzk*bn ;here the velocity of sound is 340 m/s. How much fv* dc ;tn3mgzk 3 li3rf;,lqb3arther 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 frey3azs:h-g z/(g.dqerlk he -:m.-j cs quency of 500 Hz. If the distance from a person to one speaker is 5-.gz :ssz hkj3qyh-.d: em -ceral( g/.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 beat frequency?rp bz o j5tfy*bg d9v/ao//d/hg,9n ;i

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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 550gsq)6dkwab /5-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrugq a /s6kdw)b5ment?

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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 ymb 0c*v 9bj4rhorns are 6 m and 7 m respectively. What beat freq*4v9j c0bbyr muency 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 violin strings on two violins in(jtre+1bv d5l5l g 0ze wle76m an orchestra are found to produce a bebmlele v+55gj17zdl tr0w6(e at 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--vkx 3mq b+tza(gxq; 6Hz sound source at twice the speed of sound. The observer hears a frequencv3gqaxkmt- +zb6(xq ; y 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 (normafua q +*+hqksgih46b)a;) iikl frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a freque)kqau+)qs6g i f*ik h+a ;ihb4ncy 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 30 mho. (uron0px,od-n 6 j/s away from the source, what is the frequency heard by then-6 j.0ohxno(dpu ro, 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 4oixyuk o5:nu/ xo( ;t800-Hz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 3;(5o 4 yu ikxunoo:/tx40 m/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 heard by a statiop r vi(:(0 diu3 6baffgqnt+.xnary 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 fdf ui(.g(0 6r3vxb:tpq ai+nis 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 44nvdd-.z 1m+peup:ktc9 v84 v gps/tb00-Hz whistle. Take the speed of sound to be 340 m/s. npd pkezs- gu9p1+c 4m.v:/dt t 8vvb4 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 st9cp9p )zta4 m9n+1pgbuhkuz 0 z gkx59ationary train. The train blows its 400-Hz whistle. Take the speed of sound to be ct9zk upu95p9+4hx1 p0)akm n z 9ggzb340 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 k0y3 ex27urjdm m/h. The train blows its 400-Hz whistle. Take the speed of sound to e73 xy2rd mj0ube 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 at 120 km/h. It blows its whistle, and you n yo1h*i00vqj*b/ btu hear a tone y t 1nbuboji0qh/**v0of 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. Assume the speed of sound in air is 3t d6nsn*uh56qt8jbq35+kp0 ) hhxxr c 40 m/s. Wcr hn+t hqt6jpk36n)s5 bh *qux58d0xhat is 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 trafycfopty oe(w ppat *6(0r 20de3r2yz pi) i28in horn is 500 Hz. Assume the speed of sound in air is 340 mf2o etyyde rpw t2y(i 8 zc6fi) 0r*a(03ppp2o/s. What is the frequency 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 determiu5we v bku7;oyy984oacv;kc2qve6c; ne the speed of 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 is the objeccvc; yqo;k29 7e awkv6 uvy5e4;8ou bct 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 a supersonic aircraft isuwy7/e:ms5q *g w; xplwm nq65 $60^{\circ}$. 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 isoxs x)-s3kp /crk(jz/ the half-angle of the conical shock wave oskk(zcp3r) j/ /x xs-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 ae f+hd (o;3ns;c(iso ere;w:x Mach number of 1.05 where th(+;o;irhfd3( xe so;c:w seene air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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