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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test70.html
 作者: admin  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 im,h,n6;nhlz1j 9, e.qotaqem s 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 conducted fastest through-wn1/. avembq (idj;k x q70pxkycm-;e, wmi 8

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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 a6*xpxo )x)r95 pqhork;fku ow:4tku; 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 increase,e n,)*iarfymxda :7jf ou*3 ws, what happens to the velocity of sound? (Assf *wf:a3i7, y njmud*axe,r) oume 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 of a 400 Hz sound, the velocity of a 200 Hz soundy4j bwkn03zkq8* .raag23pa f through air3kwf0p43*jzq2n yaa ga8. kbr 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, the wavelength of a x;hi l.5*w 8jl9e:hvp e5lpkh200 Hz sound il55pl*jhe.hep 9x hv:l w8ik;n 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 frequencies greater than 20,000all a-x *3/wav 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 l0 biv : fbjq+bu/jo7zhlpi4 , lf+b15bxa-;niess 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 wavesps 2yyy; ++ *-bng+hzbbw-j wf uniformly in all directions. If you move to a point twice as far away f++by;- yjwphw + b-z2fbgnys*rom 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 iyw rx+- ;+3) i12ncls+zar0sdjrsgi6xnt h q3s 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 ab8s(i3plu:k a distance d from the source is I. What is the intensity at a distance 2d from tha8lbu(pi3 :k se 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 g1*t hlwyl3l(equally in all directions. What happens to the intensity of the sound? It reduch3w (ltg*y1l les 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 thatw.q;v t+zqkr( ;4evt)xb7 -mslkj .pd is radiating equally in all directions. b4klr;d7m; exv qt-.wjst+(qkz)v. p 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 increapn z6*n-a(p nises as a 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. zic;qmt u fmr0,4y(/xjb55nb What characteristic of the sound i ,iu(55;/bmx b0jnf czt4yrqmncreases?

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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 mu 2 jl9wzpox,h 2exu2w+sical 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 2jxs. 6qb3kr m"pitch" 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 from air into watetv lk7x)wa 7wvcdtso1d 5.;h(r

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavesjf10zyhr+t2 s 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 oneyago nfrbl(m(8213bfd 9t, k a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves havf2(9d l ae,r3kotfyg(1 b8 mbne 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 whiu ;jy pw:bh9/ich 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. 8;cr q4xo ee1j55 3bs*nj kmmyWhat are the wavelengths of the three lowest tones 54m ejxje5sy3rb*1km qno8 c;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 200 Hz. d 3x fj-+ac4dcpabp8- snf*n(Which one of the following frequencies will not resonate in the p-(+fa n* s-3djp4f8cc banxdsame 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 o6 a1a2 /k 6htj-rtcqufrequency. Which statement is correct?tuko1h6-cj2q r ata/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 and closed at the other, tn btky 6d,ow9y2(s ujil:/e9 mhere

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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 wavelengtheg8 nrh6v)u a0 jp+ y1-en6ykms of the three lowest tones produe ve )8nm+yhja6 16ukr- pngy0ced 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 length7 hzm-7j92)arm c ci/fjing2d L is 200 Hz. Which of the following frequencies cfjc a2i2nr-7 h im jmg)7z9d/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 yqp xn:m,v0w5at its fundamental frequency. Which statemem,q vw:x5 0ynpnt 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 sfe-eet8 eza:cic,+- t-vpn,zame source. Each speaker produces a tone with a freq v-izce,e tenca f,-:+-8pe tzuency 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 wm-d2lc -:gu.dsy ph7a aves 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 ih39ek/cv (woc8bip 6 ds heard. What happens to the beat frequency if the f 8c/wo3k(v9bipc6h derequency 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 explaa r8/w lwi:mifutf20 7ins

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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.a1+yb ycp /isp 1-+hfo The frequency heard by the obsepibc+ys11f+p oayh-/ rver 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. yu e29b1tz /+s5 xiudm7ekjt4The frequency heard by the obseri ejy 1 9t4utsm zu75ekd/+x2bver 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 *f6v4 v-aumqd71klilo-a.o h decrease by a facv7vo-ha* iuo l-a4.kf6dqml 1tor 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 ultraso3wujp 7*o2 ,ewwoin0g nic sound of frequency 45 kHz in air is 352 m/s. What is the air tempereu i7,n03wgpj*2woow ature?

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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 spexf, .rv. kfufis-vug; )m(+o ued 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 speedbr.wst8 i ( wu;wvq4tom)4-k a of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away sr;mu4wwk a .qbot8(v )-tw i4was 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,-io gvi sdutc x8,+*j+ 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 seei 2iultwhqo,a c349,s/ysolc .ng a flash of lightning, the distance to the lightnc9oyu2t4islc/,.aq ,hl3 wo sing 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 fyg,)q91b as1habzc/6mubr 6a 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 gp;x5r3 oqf uz,1e* oes later. How deep is the well? (Ignore air resisfqr oepz oex5,13u;*gtance, 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 aiabfhnzzt*m+5fh*xq /yo, ,px 92c u3kr of 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 airtmxpy go lh z x/kk*x)a n(7*r33ir1t6 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 wit./bhik0 ) yvmjb+ hzao98 s.plh 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 sou:b6+hfc8cf q4gzl1 j wnd?

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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 intensitik3 bv r,w/ ;s8f qkofveitg)l ju(6w4.es of two sounds with intensity levels of 70 dB andv gb(wr isk3v;8/j, )fw.fqloue t6 k4 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 100 dB. 4wb bol*f 90stWhat is the intensity level generated by onebwlsf* 90 tb4o 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 sourcr-3f4m/ksg 4d bb4t*o h/ilbse that is radiating equally in all /tbbri/s *k4sl 43gbf4-mdhodirections 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 radiatk0 :lo (w t8qtdafc5) byvb1t8ing equally in all directio 01o8kvt)5q abbctdy lf( t8w:ns 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 acpa:g1f oj0v+ bout 1 mW of power, which is assumed to be uniformly distributed in vg:1f0o +jpca all directions. 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 distana /nmta,bk8x-*uwtc5ce 5.00 m from a barking dog. What would be -a58uxcw b/t*,maknt 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 on j +46mc,m rb+)dt :7yw2svwj iuy;wfrom 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 directions n7wtj++cymvwjwimor42)b,y6 ud ; :s.

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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 pointn:huk0 p;-zgu6faperb 2w (.j,d uf3w source is 95 dB. At what distance will it be wr:a(p ugun f6uzw3dph2e.f;k,-0jb 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 Hz. What is t7cs 3uj enjwvwhw(5 f f.58;xnhe frequency of the fourth harmo 7nesn3w wx vuf wj58.f5ch(;jnic?

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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 90(2 n)tg*nr25ry3yj g; 0 :foarmhafvz 0 Hz. What is the length of the pi2nagvfm 0;r)t: o5r2z*rf3jgynh( aype?

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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 am/09qww u+.zdbu a5 gcn open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate iwmz aw+u5q. 0udg/cb9n 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 atri +/ hjwm4e krh7rp(fr3 l+9m both ends has a length of 0.80 m. If the velocity of sound in air is 3+ h emw3m 79/kl+rhirrj fr(4p40 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 thehff w.p1j.qd ,2wtz c7 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 en9 68lratnlid;5 rrb5zd is 330 Hz. What is the frequency of the third harmonic za8 ;ln5b6l rr9trid5?

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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 wil8qe/gc3)l c whl have a fundamental freque)c8gl3cw q/ehncy 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 ir,lfrhu2ta;s/ afc t 3c(p w e302-jm:1 myqjthe 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 in a room where the tekrk 1l k0zr,n; ;)lsg*ie1 crtmperature 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 sp.lro9z3/znjqds ;8 : vvgx dsi9k :kr;eed of sound in air is 340 m/s. What is the fundamental frequvq zi9s;:og.;dk:8j/d rr 9x znvskl3ency?

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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 t-yk5f mf ychuh*xcd 2*s:gm:(.p/ k1vlydo7ihe same length: one is open and the other is closed on one end. If the fundamkm h( *2 ym ospg* :yfc5hiv/xdf1d7 .cuy:-klental frequency of the 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 frequency of 800 Hz in air wheraijc 5ik .*m0 fkgol64.on 4lne 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 would hean*k0a nf l6oo4mi5cgj i4. .klr 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 sa8g-tn +apk x.o5 t,ziqme 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 speakeringq+5-,txtzao8.pk ? (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 frequez l/221klrd:wj xog7mo1 , nncncy?

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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 q1 6m9c3o mwlmjqvg;6musical instrument. If the tuner hears a beat frequency of 2 Hz, what is thq1lm;j6vm6m gw39c o qe 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 horns are 6 m and 7 m respectivel3 gv ;5sau s,do4tx:twy. What beat frequency is heard when the horns are sounded on a day when the velocity o;x3t5du a svg,:stow4f 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 e/q3++vv+ m(; ipde qf:bmagestrings on two violins in an orchestra are found to produce a beat frequvbe qd:g+fe; m 3 (/i++vpmqaeency 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 sbcdpf0z7cz6 2a1 gp7 1000-Hz sound source at twice the speed of sound. The observer hears a fre a6pdsbczg cf z2701p7quency 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 observe j a(*i pk)9 00kfas7eqq5ykpjr at one-half the speed of sound. The observer hears a f k)js5* a0e(ypkq qfkj07p9ia requency 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 with6a)w jh0f0 c* dnoz h2/u3tldj a speed of 30 m/s away from the source, what fn ho)6aujwt l j3hc200 dz/*dis 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 o g :wri;i, e,(hzswkr8n a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer whikez8(w:h r,,ws ; igro 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 observe9ueh*mr)s. v t/4 vh. xzku3ua0i,o0ilh+kdqr when a train approaches with a speed of 30 m/s. The frequency of vr/0*umuelx3.4o, z.hh +vasuh)kd i q09iktthe 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 fckgfzoufuu:;12p-1 you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 mf-2g1fcf:pk 1 zuuou;/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 tokf+;yv ;h:r-sd0q ma vward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you h:m;+dv0k v;aq hsr-yf ear?

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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. 1c6.u8qi 2wl ajet x2vThe train blows its 400-Hz whistle. Tq68.2i1wl ue 2v tjxcaake 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 at 120 km/h. Ilby+wk, 6yf(s; t- bm h2iovo)t blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actuall,b;m o(oy-+wtfb2)6hi y kvs 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 342: d)bnutdbuv7n+ek/0 m/s. What is th:2 /u) tudknbeb+d v7ne 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 train horn is 500 0 iuk4(f d+z6k6vzsnm Hz. Assume the speed of sound in air is 340 m/s. What is the frequency zz4u6fdm 0k iks +n(v6heard 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.+la,vr:p c oyt,lm8w 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 thel8+tymcvp ,: r ,o.awl 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 produced by a supersonic aircraft+-n* bv4bt0y) zotz by 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. uu mht gyh2o;x/-4c1pWhat is the half-angle of the conical shock w1 htuy2 um-; pho4gc/xave 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 Mach num5w p szluz*/:wof7-bmber of 1.05 wherw5: msb*wpozf/z ul- 7e the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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