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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 st4b-o *enls)5 wf(cq yxatement?

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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 to;+tzq bt; tqi,7qd* bhrough

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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 steel rod? qp ldhtxb4*6m kj1.l,

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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 7o) dn,mxvay(f:r6xc of sound? (Assume that all other factors remain constant.xcv ,xfy)7:dm(anr6o)

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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 ,ce kf *-wu s*bsk(t7fkq-dt3400 Hz sound, the velocity of a 200 Hz sound throu,k tfc-k7q-3k*fb et*(w sdusgh 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 so1n+(vmirn ocal;(t(9 (x6feyxe vz6 wund, the wavelength of a 200 Hz sound in air iow1xen;a(r lc+ (f9(txem v6zi(ny 6vs

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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 ccqnujdpvut692w cosl q9wy 88857,p 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 frequencyu eq+0f 2s9+ hsflx/dnrfh b66 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 wafo.o +e15o6 fwh+30e rpsmang x0btv0 ves uniformly in all directions. If you move to a point twice as far away from the source, tn 0a 0.wef+g oo+rtf30 ev p1bo5hxms6he 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 divern0;j6 hqgv4w2 kuzod )ging waves, intensity is proportional 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 6 0 .lctsqwoz,qdb(m7 s(c/3vd jv lt;the source is I. What is the intensity at a distance 2d from the so6;s c vwdodl zsb/qq.tm,3(lv 0(jtc7 urce?

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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 froju5 lljglh7. fj:*gk3 wk-fe(ig w 0l+m a sound source that is radiating equally in all directions. What happens to the intensity of the sound?kj5lg0w.fw7lj j u l +-hlgig *(3f:ek 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 e1 e;)x fs-jjnbqually in all directions. Wn-;e bxsfj) j1hat happens 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 as a sound becomes loude os1w49kwp:bf r?

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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 sz5f5djxh;i)i peaker emitting a pure tone. What characteristic of the sound increjdi hix)5;z5fases?

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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 musican: qh0lxcp wbp*rc.4 e/(x2uihcf*,al 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 ) wyte,+mgpzv 1mm9 c(xgeo*0sical 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 aya e-3,fow/p/a+f jsor x16 pgir 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 displacementx; ga cagg8(jr6:0a ee0 kut:p waves are

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standin xhjh;fu2oa) q9a 9kf4g wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do thha)fu2a9xk qfoh;49 jese 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 ib(s)l-ag bkb.(43x jol nj/abs 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 th q*mf 5z.ej9(dnkzyw *e three lowest tn*fqy (m* 9ej5z.dwzkones 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 is 20mmtbl-875 n gl0 Hz. Which one of the followim-8 ng7 5tlblmng 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 resonating at its fundame1s( so. /zbzbqwil 6:rntal frequency. Which stateme.qbl6/ z1biz: rswos(nt is 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 onpf 93imrhw f:,4x ipmru6, +qv.y2zol e 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 lie/ib.l ixzo5k08,v * t 8zdfqength L. What are the wavelengths of the three lowest tones produced by thi*.o8/0b8f5videltxq , zzki is 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 rufk:* gy7u9; dkk2)fth. g eabesonate in a closed pipe of length L is 200 Hz. Which of the followif; bk:kuat2d9y hkug)7 eg*.fng 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 e55/awja hm:) dml+janamx4+ rnd is resonating at its fundamental frequency. Which statement is c ra/5)mmaa jax:jm5 lnd h+4+worrect?

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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 spe8f0 / b9foqzg(gaoan- akers driven by the same source. Each speaker produces a tone wqo/b-gaa fnz(80f g 9oith 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 two sound waves shouec n+rw xxq7/j ie(sm96z8kfq)5wy ;u ld 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 to ey8.(axfjy g8gether and a particular beat frequency is heard. Wha8gy j8ex(y fa.t happens to the beat frequency 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 exre u3i eccr4 wfpm45a)9 fq:m*plains

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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 .n (fq)qzn9v nheard by the obse)n9qf v(n nq.zrver 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 ob/zxy9r5zmd: 4tevs w912 qlx0 t;oj ujserver. The frequency heard by the obsezwro1zs9 lyqemx/ 04j:2 xj; 5dtv9t urver 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 do;27 ok6oqpk oeuble its MACH-speed, its half-angle will decrease by a fa 26oq7kkoe;po ctor 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 air is .nkibt6q3-ruvr. .w acvv4gxg e/6,rf q4 mv+ 352 m/s. What isx cq,tr.3/4f + vr4n6reakig b- u.v.6mqwg vv the air 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 the speed 7siuvb2s vx6q *zvsb5 rc*- g7v k*fp-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 bat emits a sqf9x f; su;wf)u5)s0()z ds h pvkmc:phriek whose echo reaches it 0.0250 s l0shum q9(fzf ))cws p:;vup;5 fd)xksater. 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 4.00 su1 h n)n)ta(b7di3xdu. 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 ayggn tvw59( ;cfter seeing a flash of lightning, the distance to the ligvy5 9ntcg; wg(htning 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 clif fa3tsl.dit:;jpb 3v+ f 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 /cpney y*tvnvan .q:0w+7 +w:4. jx a,uoq dqawell and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and ass nuaq,4:qj no /e+x.n+vya7dat v.qwyw0*: pcume 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 freq)va nv-9 :*) y)ucmjm yzlze9allgi*1uency 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 ail +jqikps8 dcm5p0l/9r 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 ofh:delo4c)ho y.6 3 nett iz.h;,d- clc 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 npgxw qw:/1f3sound?

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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 sou)dm6v(2v w( gtzgg0/ax* ;xfah3kpvsnds with intensity levels of 70 dB gwvx)*a0 zd3p(v gt2(shg;xv mk/a6 fand 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 gar4oyk kc- n4x*lage is 100 dB. What is the intensity level generkk *4xl -n4ocyated 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 radiatib1 v z7*c4ocqnfdc ;w7ng equally in all ;f7c*qzcdno 74cv1bw directions 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 ist3z br 27cq:du radiating equally in all dd 3 cb:q2ztr7uirections 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 be uniformly f.azhk) 3-*z.b ibry g0s2qjvdistributed in all directions. What is the i.bv g.i2-s0rk yjz fz*3qh a)bntensity 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 fck:qads(/7a vrom a barking dog. What would :qda7s(vkc a/ be the 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 from a sound source the intensity leve+( os- qwamhj.5jce9*ni zj5nl is 60 dB. What is the intensity level (in dB) at a point 2.9*ojij q-n +.5cnzjah s(5m we0 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 level 5.0 mr8g* dn ie6 a-;4qcg*+(fk: dnjnd tew from a point source is 95 dB. At what distance will it bekd6cfde( d+nqg*:i 8new-a ;gj*n tr4 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 t1;um8 heqv6 pkx 9f- oxk0ki4sone has a frequency of 1200 Hz. What is the frequency of the f -vh4ixpmqoe1f0kk;9s k86uxourth 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 abpt6 06k(h zgd97 yhsfn open pipe is 900 Hz. What is the lengthfph6d7yg9tz 0sb 6h(k 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 7o.:;vgfbrc 0enl.edin an open pipe of length L is 400 Hz. What is the frequencyfe.eon 0rdcgb7 v.;l: 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 ends has a length of 0.80 m. If the/p y-d 1zqdf*1frv6hz velocity of sound in air is 340 m/s, what is the frequency of thed*1zydqvr f p-6f/h1z 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 i :seeaxx98p -ds $20 \; ^{\circ}C$. 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 closed1ie0v-:yngw 9f8lx hy at one end is 330 Hz. What is the frequency of the third harmonic-v9eg81y l yfxhw:ni0?

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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 shortest5 .daf, 2.b3/cj1wmyei scp qy pipe closed on one end that will have a fundamental frequencj1mb 5fi.cc/y pasw y,.e3 dq2y 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 l4ec1sae1jcr i,k65 i $20 \; ^{\circ}C$. 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 temperxmdgl199 bavmpjp /dyx i*889 ature 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 in ai .:-ovy+pras vr is 340 m/s. What is the fundamental frequenc va:o+ryv-sp .y?

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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 le42 x+h* mh*zwh 44 mq.osuaqmvv-9 ntdngth: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz,oah.-4hqm*2vvn tw mh 4m*qu9ds +4zx 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 wher abcb 6y- wp2(axqvt4f)2w t:re 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 wouldtw(pa 2bct) :6v4 b ay-rxqwf2 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 sidw7w* hydt7sa8go ni ;2e 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 a2hi7*; ygnowdt 8sw 7detects 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 49xbq+9l,+bo4vw*-iu kd xfov2 un: ht44 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 tune the frequency of a musicalf+m)(l9ogrzk + frjg8 instrumerl f8z9r o(gg+m+fjk)nt. If the tuner hears 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 produdpjd:+5gbtk 97 ,adrnced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are so+rba d5kg :9jdp7,tndunded 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 om ywg8xxh+ad j45 no*)n 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 ofn5yao jd)gm84 xh*+wx 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 statio/mw 9n5 r:. ejtf m9uudn+(9n cwhxp+uad0)oynary 1000-Hz sound source at twice the speed of sound. The observer hears a frequency of/u a5pwm.wr: 9n9ud0jx dfhu9n+o( c tn +mye)

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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 stationarqtszy/ b1 nq)*ofv;g +zhu51 ty observer at one-half the speed of sound. The observer heao;f) *15/yb tsu1 gq+ htnvzqzrs 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 /c rcp8f/5m qqh6iiq3Hz. If a listener moves with a speed of 30 m/s away from the source, what is theq c ri5 chi68q/qpf3m/ 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. It is tr m4nc20:w2 czoipr3u yaveling 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 frequency does the observerpw3c ym :z0ou2i c24rn 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 stat c.:sck;(q6tcmhaua 1ionary observer when a train approaches with a speed of 30 m/s. The frequency of the trai csq ukat. a;1mhc6:c(n 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. Thenmg-l* bu;xp; train blows its 400-Hz whistle. Tm; xgb u-lp;*nake 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 tow9wntnfcl :e,k+z.l7gard a stationary train. The train blows its 400-Hz whistle. Take the spn7g.nzcl+kf:elw 9t ,eed 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 travelingy y rg6g1m;ujlxzj1+ 2zd d,)k away from you at 120 km/h. The train blows its 400-Hz whistle. Take the sxd 1gd,l6r gj2z; zyu1jykm)+peed 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 at 120 km/h. It blows its whistle, a1:zoo,dtq gsm3 2- asg1lu9 lf4 5gtland you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is theoa q9lg,zd t4:tsgg-u2o3 f1la l15sm 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 tra +9/ g (nb4fhx6cxpgudin horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the trainx+ (c dfgp6/n4x ub9hg 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 theaq*7yhayl7sio8b cm zh7t*: 4 speed of sound in air is 340 m/s. What isyq *:m8 ho4az7 *ltchay77bis 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 determine txx+6fra so.2kzf/i-pc(m fq 9 he 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 object movi rc6pf./(9 +qfi xx2mzsfao-kng?

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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 sho.k.oyd2 hxrbl.g fu34i o;h/ nck 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 ofv2fq;ita6.g+rs05yh1zxlf x(g y.i t Mach 1.4. What is the half-angle of the conical shock wave foi z f1g(sfg6 .ylq.ixxa20t+ h r5vt;yrmed?

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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 s7; fonpn 7ltc+u*3 rxwith a Mach number of 1.05 where the airp7xcrtfl n u o;*n37+s temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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