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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.iit6oh8j e; oas,lc )qvg7r + 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 conductedlr.+ 2bsr+4xvjgs/d q 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 steeo7nia/b v l-u9l 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 t) 6b(sbg o+rwuhe air increases, what happens to the velocity of sound? (Assume that all other factors remain co (osrg6b+wu )bnstant.)

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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 velei2e* 82trbh ogkb2 32m zjjm4ocity of a 200 Hz sound through air is2m42zmr 2* hejb8iet2 j g3kbo

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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 Hztcugl946a64as5 hwctem .r4b sound, the wavelength of a 200 Hz sound in air ir4 egu64as4thw. c tca 5l9b6ms

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations withvruoe/ a*+psd en 63:b frequencies 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 c5x s*mzoj7/qyp;cimtz6 kl0:alled

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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 e,/pcb.sj5rsh dwqrp4rd a2r v.w/ 2.56jrsy q mitting waves uniformly in all directions. If you move to a point twice as far away from the soqjr25s5b/w. 4qpa.ds r2 jv/ryp dwcrs. r,h 6urce, 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 p/o)wkoywht1e f32 1r hroportional 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 l6k jgo)l3r )hsource at a distance d from the source is I. What is theol3)h)glj k6r intensity 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 is radiaehkc7 co*g*k1w,nb(1 n a0 wwyting equally in all directions. What happens to the inten1hb1n 0kan*c, cgy*(7kw we wosity 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 inqbzs: tba, 8r88, eyvq all directions. yr8b8,zq q ,atbe :v8s 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 sm0uxy9/ oc pe01pg6md ound 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. Whak h17)6tmi 61il3c 2hichdeikoal m474 t w-ret characteristic of the sound inmo74r ic 6ihh-k3)ei7e4hi1a wl k 2mt 1lcd6tcreases?

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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 no2ckyw;cmnzjd1 2 p 7n+te?

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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 noh 0o/ +eqtdrb8x*pn4t 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 fr+kos65zr- ildom 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 aredli+1d7r: uk g

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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 ny 2 a , g1/bb3oqeukw :5ay7z*va-pxdsound wave generated by the guitar as a ra a wbp*q1:-z7 /ebg3xau, onyk5 2vydesult of this 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 ophbs6g ,ql)m5;e. h jlpen 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 the threea z bgapmgue0:8a3/ a. lowest ton8uazgb. 3:ea / a0mapges 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 H*lh8hud t+ yxx7zrip*m6; -yggn8* r kz. Which one of theuyrzxdhgml* g8 khy7n6ix*8- t * ;r+p following 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 fundamtx/x4/pmdp lg7 , tka-ental frequency. Which statement is corx7txdkp// 4ap,t l -gmrect?

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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, 6t yx0y p6h* ivzwa*-tthere

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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 of the threev(8;, wuq*molg9kl31t e2 l eeu ji.jb lowest tones produced by thi ,btlqjkg23ue*i l(1ve 9;.8ujlowmes 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 200 Hz. W 6j((:hj ypa/jkfzhicd 1m25u hich of the following frequencies will not resonate in that :1y faupkjh/6dhj(i(z jcm25 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 u4oj+lyfj. 7aluu t zri 497m2p89a iqat its fundamental frequency. Which statement is correct?l.jo7z4 japi9u 9iuma8y2f tu+ql74 r

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands betwee pynn+ mf)4/q c3a -w-i1v*)rjtyodeun two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 moyet-u c)+ nrp3dw/iyq vm 1) j-4naf*/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 bv9b w9u)i ge8eeats, 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 frequency ,l:b6palo m-m is heard. What happens to the beat frequency if the frequen pal- m,om6:lbcy 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 exp hwes3f7az)o9 lains

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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 st ;h -p*adym,the observers,d; hay-*tmp 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 exp5 a ,*;scjc8g9n7o+eby.ql8 ylbk frequency heard by the observ;n* ba7,e. p+8lx5k bjyqcyls8gc9eoer 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,lv -xl-w(s yu,1zrm+j its half-angle will decrease by a factorzu syrx-(j+v m,ll1-w 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 i+b)j; dr lh 5f54yhtr3utabme9y:l b;n air is 352 m/s. What is the air tempertml 3b;t 94 hry5 ;ef:hurb dayjl5)b+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 speed of soundk gah0e0mcf xr+0p-wk,6 vb o* 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 bavp5h ohaln)-/t emits a shriek whose echo reaches it 0.0250 s later. op/ha -5nh vl)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 hb cph,dz+5 7tiear 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 seeing a flash of lightning, the distanw,k e9c6xpkt- ce to the lc-kt e6x pwk,9ightning 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 cj*u1 ;lom3j1 kqm dco3ja 2* a2nv(tja 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 s later. ahr+7vq+wgxyz*xr2;9l rg ) fHow deep is the well? (Ignore air resistance vyq++ rlrr7zf);ag2w*g hx x9, 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 wavejr0m x 7),o8 tjp5otxr 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 atu3r;90fcd agf $23 \; ^{\circ}C$ 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 levels qws:1:a og9v 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-tl123z19h s pl v8tsjxdB 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 two sounds with intenri d ;,ujqu; if.5;lki71enw wsity levels of 70 dB audwu;lf; w jk75,r .1qeini;ind 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 g oro8ez 9xp*sgy2s51jarage is 100 dB. What is the intensity level generated by 5spoox *y srje2g9z 81one 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 framyzahd(h(l,k 9 qn84-28rexwc :tisom a source that is radiating equally in all directions ihslnm,echdx2i 8 w8zq-a9t y:ar (4 (ks
$6.0 \times 10^{-10} \; W/m^{2}$. 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 9*igiaha4vv- source that is radiating equally in all 4v-g viih*9aadirections 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 di,dtp u-- h 8gd)j-ee 3-ffahmjstributed in all directions. What is the intensity level at a distance 5.00 m fro-jeph)m fd- -fja-d3uegt8 h,m 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 barkit)cnv15ou cki;3z0i boz a( v3ng dog. What would be tho5i(z)t1a z0; bk3cv ovui3cne 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 inte;bc rz. nbvr+m,t.ndi+ pf2xx 2nd(r(nsity level is 60 dB. What is the intensity level (in dv( zrnxb df(+,+dtnx2;bi.2rnp r.cmB) at a point 2.0 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 lqf.4y5uy gno+ 7zg1ti evel 5.0 m from a point source is 95 dB. At what distance will it be 755og+1q4 z7nuy ig. tfy 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 thep ;oupyq 71:lan exws2ac.u*2 fr2wo c:2auyql7p.uanes1*px ;equency of 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 h m/agbuwbl8(03b kr zjc:v1/ earmonic of an open pipe is 900 Hz. What is the length o:w c(vm0b 8 3bz//ge1jbulkarf 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 hwxyu3h3.7bjgg fig q aa +- nsm94fd.16odn3open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resbo43n3fq gs3m .gh y .gjd ui 7a+haf9x16-dwnonate 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 thjbr-k7 5.rpni q,l4kjr c49ake velocity of sound in air is 340 m/s, what is the frequency of the s5 qk pij -r4bk47cnrk.j,a9lr econd 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 af kon e.)gcryfa8v qbd;35d .- room 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 p; )rw, :pvmauvp e.u*end is 330 Hz. What is the frequency uv.p )mpr *:,ep;wavu 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 nyr,gr78f.v.l2 iisb/ v ) oglshortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a d.v8fn .vb l/7,riyo)2 lrgsg iay 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 the1 xlhxonh g* sl1vl8/+ 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 .:i6cinyufd5 .pnacjr 6t59bin 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 pyq.yd(v+ g b,rk)9xtb layed when the speed of sound in air is 340 m/s. What is the fundame(.y9, xrgvy qbbt)dk+ntal 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 otr2z/*d;m 75xhmmf 8 bs.mrpnkher is closed on one end. If the fund .km 7rx mm5ms2h8d;bnf/*zpramental 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 where the velocs ) opw-a nex tp1k19+3tgu0liity of sound is 340 m/s. How 1ws9ou kt3 ptg+na-0xe1pi)lmuch 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 driven by the same frvr6k5i 6 s -a8q1kbmgmequency of 500 Hz. If the distance from a person to one speaker is 5.00 m an-s mkq5ka6i1 vg6bm r8d 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 ancyx+b /0fud7:9 hctme lml**ed 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-H,ea uv,gqz/bpmc))o 3:juqz . z tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2b)q:zuj 3g)emcav ,p o.qu/, z 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 horns are 6 m an ;n*eyi+pa 1ezd 7 m respectively. What beat frequency is *y+;1pz eaine 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 an orchestra are 1+cmhy8j e8+b-lw xzu found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings wou8 jclbez8m hwyx- ++1uld 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 tln4kh-t7j 3cn c(h (gowice the speed of sound. The observer hears a nn-l7h3c4 tkg( h o(jcfrequency 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 obse w,4ym +zdwzy8 3l.ffyrver at one-halzdy+y.4y3,8mz fw fwlf the speed of sound. The 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 moj 21mk nkkn6s,ves with a speed of 30 m/s away from the source, what is the jkk k61n2mn,s 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 a:qql xt:t9y8 6jw fu-xt 35 m/s on a day when the speed of sound through air is 340 m/s. Thu : xtx:6-jqtf8w l9qye 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 stationary observer when a train approaches 0v8n9lyhqrpd exl6m+(t7 ot, with a speed oxm vr+ntohyd7 ,9p(8lq0l 6etf 30 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 u+yg t. 7o8a9a3wwskgyou at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wh .t yk9ws7wg8g+3 auoaat 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 km8i0wr b:r 8mhe/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?hi w08m rber8:

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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 23jq1w)k.y0(qlh vx/-wkf ppb 8g ummkm/h. The train blows its 400-Hz whistle. Ta /bp2vmmw(0f w-3u.g8kyqx jq k1lp)hke 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 az, hiukwsf* hw 0506nqfx)4 uwt 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340ufshww5 6q)k 0iz0f4hw*n, u x 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 speem tlxr knp. 92thws.:9d of sound in air is 340 m/s. kh 2.xs9nmlt9p.wrt:What 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 train horn is 5uo)mzap7y )9fgs 84cre0uj v000 Hz. Assume the speed of sound in air is 340 m/s. What is the fcmy4fe ru)a)pg9v0ojs 8z0 u7 requency 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 the speedq ya,rjw ite5/q2( xuw:dnx( i4(bhj7 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. dxe: w(h(ajqqjuxiy,4w52nrt/( bi7 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 produced by a supersonic aircme n/ipg0sg5+2se p ;braft 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 ox2 e2ily:np4bf the conical shock wave formxb 4yp 2nl:ie2ed?

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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 S;lm un5qypi ;5tates to Europe with a Mach number of 1.05 where the air temperatuin5;m ;5 lpuyqre is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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