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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  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 s8gu7t zt2ngh34x af /qtatement?

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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 through9g +475 y:d,mdzmkvxije5ua u

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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 soundpjots ly j6a+ ,8wl++a 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 increx znf ec8ukk28*8 jq*uases, what happens to the velocity of sound? (Assume that all othef excu8k2 uzk88*jq* nr 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 400 Hz sound, the velocity of a 200 Hz sound throl wvdns-c hd 11of6xgx(0, gi0ugh air isgw dlhx( fc,gon0 x-0d1vis1 6

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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 200 Hz qoe4-im3(m72 giwbt9 g jccb8sound ic-(igj9bcto3bmg im4 8 7ewq2n air 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 frtnbv+:n(-dyw p4v/l3kk l/ rgequencies 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 calley ) w4.vw, oqb6kjq7xvd

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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 di s0q )yq j w3awyqph3:xey(sg1ey*fk-5*me(t rections. If you move to a point twice as far away from the source, the frequency of the sound 5*t*: ( 1yfjk3 exey0ampqyww(gy)q 3e-sqsh 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 proportionay:0bor:; bwn/ aj 3y(pvb f.awl 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 dist;hmp6;bakhyf 4rbo 52ance d from the source is I. What is the int pa o5bf;y4bh m6h2k;rensity 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 ig,rst oz z*c5 1mg+0jys radiating equally in all directi*0,+tz ocgzrsgy 1mj 5ons. What 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 soundcfgu v7k/.0p zh,zq1 z source that is radiating equally in all direct cz kzh,p /vg0u71qz.fions. What 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 becomewb pasb,468r5jy3xap s 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 eml3: 91ptwa0ao7htpt; n ttq+qitting a pure tone. What characteristic of the slpa pw79qo+0t qt;n t:1ah tt3ound 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 musical note?lm9w6p:l nru y4(ipk0

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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 x: ,tm-rvybbx:3j o d1note?

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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 into wat gr00ctpfwnz 4 n 8xb75nn1rg*er

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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 ar+.kz; q pcvzt6e

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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 gui,0r,x hxlc2m,:gnqkb1dyu .x (0 dupftar string and the sound wave generated by the guitar as a result of this vibration. What do theldnxf1g, krhx0ymb p2,ucx ,:.(u d 0qse 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,*b9wm 8bhgqd)(pp; k a 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 wavwb vlv0p+*0qozawv:b p90dvi *2ppn.elengths of the three lowest tones produced byvnv9.zppvb2* +0wopid b:w qpl0 0va * 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 200: +aufv:o7c2.tn , a7qkfssqf Hz. Which one of the following frequencies will not resonate in 7+ faaft7ssk,: nqq:2vcu.fothe 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 i l6r(d5fi3l 2x.zkx0bes a r-uts fundamental frequency. Which statement is correct.f20r lzxrel u5 3sd(a bkxi-6?

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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 and3xg shz0ifir295s e d4 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 wavelengths oi5dfx o35tn ,t2m +fehf the three lowest tones p 53eft +h,idmtxnfo 25roduced 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 xqch. ,fr(t:v wj2h4gclosed pipe of length L is 200 Hz. Which of the following frequencies wqr(j x. v,ghwf 24c:htill 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( i6d n)k8h3cd4 jp lpgxt5wd+ fundamental frequency. Which statement is c 5 xi(cw8ldn+6p gkdjp4h d)t3orrect?

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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 speak 2xo*od .r6zrmers driven by the same source. Each speaker prod 6dz*xr .o2rmouces a tone 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 beatsvrn 04/ut,gv j, 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 frequencyqvv,4 ao 5rjw7 is heard. What happens to the beat frequency if the f,4v 7wa5rvjoq requency 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 explagpku.wc/;ly5+;n jj zins

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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 frlpzu;kx.+ jr8*1t 0vce ah5xs5 l)z5y qugl/zequency heard by the obsza)xzy/l+*1u 0p rc.xvsej k;5q85gh ut5zll erver 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 obserdk au;/iel 91lver. The frequency heard by the obsu 1dl;9aelk/i erver 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 halwjzr7q8js qow-iqp*f4e7 m /5f-angle will decrease by a fa -8zq47sq5 7fq rijewp/m jw*octor 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 352 m/s. mdw6zl.r kzx g5x/ ksd16/j.fkeq 5 1gWhat is gr/5ks1gkkxf zex d5d16. l.jzm 6/wq 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 ofb vx7ze3;1/q0 3w)hoqkq.bhqbpyq v uq4j0y0 the 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 8x3big1tu 8t1i oox/5a88flcl5og zq/d r b0wm/s, a bat emits a shriek whose echot8io8z81b q/l3b o1tg r5o8/ l wxadf0giu 5xc 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 cliffz6b(l m/.c,sw dgx9 7kvd9yd y, and hear the echo in 4.00 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 after seeinkh6n3)j xpk 8rg a flash of lightning, the distance to the li8x3p 6)njkrkhghtning 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 the temperature isgke*v;l e. pgjv,j e16 $15 \; ^{\circ}C$. 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. How deep i)siogqbui/:b bm9z x3 .zm7d9s the well? (Ignb g9qui: )d 3/xomi bb7m9zs.zore 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 of a sound wave of frequency 500 ivestn2b 5) z;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 af+lqwr-ge2,ir8 yx8b-t ce7 q ir 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 wi9 rx 9rl4fl-,f:gxqd)ge8+:h w thmpgth 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 7 d4hf kmou6q0 o3yrrfp2a)9.d0-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 intensit)u8qshb5 a(8pvb p ml*ies of two sounds with intensity levels of 70 dB and 40 dB 85(8 *uaps vm)bhqlbp?

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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 the intexq ,: 22mwvb0h sn0eiiqjv ,2qnsity level generated bqxinv22sej0 0 2,vqiq: m,wb hy 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 46 jv.ja:-2 qktsxs+k0xbf kjpnx-n ;all directions :jjkpx60tk4knasfj+.s --;b nxvxq2 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 radii)0 0vdnk2wb iating equally in a0 knii)0dw2bv ll 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 delivers about 1 mW of power, which is asfz nq,n;fe,z 3o .l7ggsumed to be uniformly distributed in all directions. What is the intensity level at a degz,g;on3 7q,z fln .fistance 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 fr c8u;sc+any8d om a barking dog. What would be the intensity lda yn ;88+succevel 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 level is 60 dB. What a++d knora+( xis the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directadxn ++ oak+r(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. A l)c1ew; 6vydqt what distance will it be 75 1 yq)v6wced;l 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 Hz. h 0xx ek+43n6t qd3uti What is the frequency x 3hti+u k 3dtxq640neof 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 pip3d* e7jif5 x,8v hjbgoe is 900 Hz. What is the length of the pipe?bjj5v3* hg 8io d7xef,

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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 length L is 400 Hz. What is the;n.s, b0qrp;psbw -mr frequency of the lowest tone that will re.,p;0; rwrs-nqs mpbbsonate 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 inm7bucw o-4/ ;lvo65d3ydc u*r2 ukm the velocity of sound in air is 340 m/s, what is the frequency of the second harmu5mkdyowdu;v4i -ol7n62* c 3ub/ c mronic?

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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 zl x59a) ueje(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 wo 9uy mox n9z9,a:px e(-is5 fu8.vtythe frequencyi9ve ozy o9:af5yp muw-s(9 .nxxt8,u 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 exukd e96ys68fnd that will have a fundamental frequency of 60 Hz on a da6dsk 8xf 96yuey 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 tempe(lnb jw pg1ai2*bb;*xrature 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 nv:qbmr1ln: e 826isz 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 speed of sound in a9 xjokcx: :p.km.v f+wir is 340 m/s. What is the fundamentkvx9c::xw.mo. j pf+kal 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 closedzo5:+ fyo mza( on one end. If the fundamental frequency of thmyz5 +:ofo( zae open pipe is 300 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 frequeqruptq7tb 7)( yy)s/(x n9pwnncy of 800 Hz in air where the velocity of sound is 9/(nq) tus rtyb(n)w x7q7ypp 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 dri5vbdr 3 0/s2ykf vmd2vven by the same frequency of 500 Hz. If the distance from a vv02 y35bvksfdr2/ d mperson 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 d.s w a7s+wv5x1-tud 2bzxy7j 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 tuningjq (5ok5u1i/ r 3vferk.gbhn+ fork to tune the frequency of a musical instrument. If the tuner hears a beatknvg qr(o .31 b+ hjuie55/rfk 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 s,* i6ulu; eirzggr3nvde,1e66y a bzk+ 9hhq(ounds produced by two horns are 6 m and 7 m respectively. What beeqeniku,v hrb693+( ; z 6 giehr *z1u,la6dygat frequency 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 tn;, jw7dyp)mmg5b :e ,r a6myywo violins in an orchestra are found to produce a beat frequency of 2 Hz when a freqya:w6ygr )m;,,7en mjypmd5b uency 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 stationhr yr)i b, -u00f/e tcyr)qz+zvra36a ary 1000-Hz sound source at twice the speed of sound. Th0btvyz+, czy)rar-ar 6h0)qr/ 3 fuiee observer 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 (norm9 y) pfuhwa/iaory- 44al frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. Tu )h w4aio/fypyr-94a he 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. If a listener moves with a speed o zi,cz/mq(hlp: 1)yyo f 30 m/s away froyzyi()o zcm,1l/ ph :qm 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 siren. It is traveling at 35 m/s on a day wh v4 pbfw ug/a)v.s6plk(/ *ybcen the speed of sound through air is 340 m/s. The car approaches and passes an observer who is stan.g/6 b (p)s /aflv *pvc4wkubyding 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 /2,vaonzse9 fi d17lhm8gft a1y- iy4 heard by a stationary observer when a train approaches with a speed of 30- e za48o/y7fhl sa1,ymi9f2git1 dvn m/s. 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 yo v(.cyiofaglhn;zy4p92g- 1korg0 v+u at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency d 4h2(avo9+ggz1.ky i0onpcg ry vf l;-o 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 tow4up3pqe5 vt/bard a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be pepbuqv/4 53 t340 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 pt-96 a4lqj hvnh)uc1 from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hea- a9 hqnt1ulvhj6cp4)r?

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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 el0 jt5t:goqlmt 7(s:you 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 fr tt( lmloj:t:g07es5qequency 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 iscm+r ig9/qc,n txtd90 340 m/s. What is the frequency heardt0xcc,i mq9rtng9/ + d 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 train horn is 500 Hz. Assume the speed of soundsss:k57kynej6gp o : - in air is 340 m/s. What is the frequency hepkej s:yg7-ss n o56k:ard 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 speedt)1q/ v57ix gajh5fzn 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/jq5n5vx 1/hi)t gz af7s. 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 shock wave pr2xdyk v6p7)zq: k:w4 iu av/laoduced 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. Whatv62pv9p jlbiqq16c /o is the half-angle of the conical shock wave formepbj6/ l co2 9vvpqi16qd?

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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 Mach nugx)ne8fj (uh/ mber of 1hf)n e8xgju/(.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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