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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 state;jxlnkjh7i-;m-ac 1e0kfx,w ment?

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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 conduc0rb 8g6cmf(ibepe-i(a tb2cw. u9cq,ted 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 9rikx /+l 29wd2(ru/jyjgvejmz 7kr- 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 increases, what happens to the velocit.aebb ytird6sdsrf3 690 c* *uy of sound? (Assume that at su ciyrr0ebd6as3b** d 9f6.ll 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 velsbbka+q. mp;+ocity of a 200 Hz sound throug;.k mbps+ +aqbh 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, the wavelength of-9-g mld:tll v a 200 Hz sound in mtl9l: lv-gd -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 greaf5ug;c v z :m4l qp j*u(8+e;1sjchstzter 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 freque;njticna d5p 3xd919f ncy 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 waves uniformly in all directions. If.iq7xwae.1 ov you move to a point twice as far away from the source, the freque w1i xq7ae.o.vncy 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 r;6ltgt2gp;-(gdbxt 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 the source is+lit(6- v guuj0i0as. *ud szc I. What is thtaduzu 0lvsi0-u+ i6 j*.(scge 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 r :fxs*hrqj9s9u:;q yhadiating equally in all directions. What happens to the intensity o j 9 9xfy:uhrq;:s*sqhf 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 tu ,s bk1kjc0.;gd55yi szx jb+hat is radiating equally in all directions. What happens to the intensity level of the sound? It drops bs5kdcx5;k,yb.gs b iu 1jz0j+ y

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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 becs kvv/ c:;aex/omes 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.soubw do9kzhq 3 xy9 -2/o)mr/ What characteristic of tkq9/soh -3m /oy wo r)29xdzbuhe 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 a mf1iqf5o02kmvm,:b 4p*vc sftusical 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 musica(h+d/w q6d0(deptwt ui0w( qnl 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 wtf8r./y; ioy2ap p2a ar )8kzyater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement3shjp:8yd*(nix 9ano6w96sbc 8 lcty 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 standing wave on a guitar string and the sound wave v8fc1oa:g zxr). iud-fnk0b4 generated by the guitar as a result of this vibration. What do trf.: azku 0x8o- )dbfg1 4cinvhese 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 issh3/x lzym0k c2.; pcw 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 azdnk1*0hayf(4o t y)cre the wavelengths of the three lowest tones produced by thi)*z y cfo41yd(ka 0thns 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 re mx+ v-as 48s5qdngy4gsonate in an open pipe of length L is 200 Hz. Which one of the following frequencies+ g84 xa5-v gqnysd4ms 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 reso)34 wwifud yb+l5kf 0inating at its fundamental frequency. Which stat)wwlu+y 0f4d5 3kfii bement 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 wibd s* kf))q vfn0g64lhich is open at one 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 length L. What are the wavelengths of the three low8xjhi f pl7h;rw7 vj.4+i.unmkn7n5vest tones prj.n7n ji;m5v lnx77r48k.u wvi+ p hfhoduced 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 length L is 200 n 9 1s8eicyvjfpzyspg +a a9;u,eo- ngin-58/Hz. Which of the following frequencies will not resonate in that pipfn 8jz/sa 1e59voyng pins g -p;8y-ei,c9+aue?

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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( ec8omxq5 :aa frequency. Which statement is correc:8a m oe5a(qxct?

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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 sadt3-yd du o2)yme source. Each speaker produ y dod)tu3yd-2ces 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 beats, the twy6m8 0w wtpjihai9a4oi :e/5fo 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 pa u5n.0t r6qkpirticular beat frequency is heard. What happens to the beatutr pkni65. 0q 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 exp* py/ w1qywzys(6xht( 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 frequegr;)qqx4fua mbu+ 92 4yvh yg2a0 bnx1ncy heard by the obser 2;)h41m24xg 0uyafg+ay9nqv b xbur qver 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. 3kehc; 9q4(s+vvwojj The frequency heard by the o k s jve3jwv94oqc+h;(bserver 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 wix ;gin2 +xwe;;-zz8wns oq3 hkll decrease by a fgk38z;n n;oxsi+ e xhw -zq2w;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 air1 a,/em9)sib9dkyq dk is 352 m/s. What is the ai, k9dbe)q mk /is91dayr 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 of sound i *pn(pp+4k 8hfe6duz - fztlt.p4w;sohvpc8* n 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 shriek wtrb gi(3lyu 1:hose echo reaches it 0.0250 s later. How far away was the object that reflected back the(:irg t 3ub1ly 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 tempenb (/k.doqjjj8h zp m 940:tmjrature 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 a13:jhd.o rls5.0 s after seeing a flash of lightning, the distance to the lightning strike is al1r3.as:hodj bout

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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 /h ir ngvi g(h,-krpng 6b5zit7(02ek from a 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 late+ -pm f+sapvgc f;0f*yvb,ef.r. How deep is the well? (Ignore air resistance, and assume the veloc0apv-fmy*s , b+e+ff .;vp cgfity 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 sou eeh4idaf)w 8(/4blxbnd 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 air at0,cl15m,v5f vcjv( ;qo wb* liueted( $23 \; ^{\circ}C$ 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 bm--2 k1ersd3w hv/mva 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 7hc42lqzp 3tl.12th jg0-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 i) +1rd 8lr)gf7bfr klqsn2 jkio2xe (;ntensities of two sounds with intensity levels of 70 dB and 40 dB?28 r (jq+iso;xr))7krglkffe ndl 21 b

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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 thzvcjt5xr06 )oe intensity level 5jtz xcv )r60ogenerated 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 from6ww; * g.dadu xzs 8j8i)qpw1h a source that is radiating equally in all directio 8 sx6jd)8;gwp.d* 1uziah qwwns 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 txs0s fc4k538 b ac p07d6j/ssmnbhu1a source that is radiating equally in allc50 hss s783kfj tbbmd0p1 6nc4u s/ax 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 is3aj6xl;ouzejktb 7e rvu.8 3phgh 20,;i nn j) assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from ti j8h6leep3anb)v 20.jg3tk n,7ruz ;ou j; xhhe 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 atzowof6xwwy 2i- -w 9utv 5bf06 a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs verywzi wwo56v-wx9t6yob- 0f 2fu 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 thelrig tl6c*jfz/ + .yy6t.;jxk 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 ftr *zc glt.yj 6;i+j/l6x.yk 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 poi7 9fhfaa sw48rnt source is 95 dB. At what distance will it be 75 dB?98ffrash7 4wa

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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 zl )td9u7npms c 7(zo6a complex tone has a frequency of 1200 Hz. What is the frequency of the fourth us7l o 7()zpct6 m9dnzharmonic?

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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 900 Hz. What is the leng, ,t vf+e6 2glxrici4om1p( or:.duhb th . hd(xoevcrbtol u4m 1i2pi6g:f,r+,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 res9ny)) j51-ysp wftii conate in an open pipe of length L is 400 Hz. What is the frequejyp 9iys if)-n5t 1wc)ncy 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 og4 wqn4ni)8t g .xjsh/f 0.80 m. If the velocity of sound in airx4gji th4wg).sn 8/qn is 340 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 t8 mdu0 guaehmfy;iq9hahqt95 6 5::xfhe 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 frequen6v/5a6o borv rcy in a pipe closed at one end is 330 Hz. What is the frequency of the third harmoo/5r6v6 rav bonic?

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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 will have a fund znlozp9(u1,9)ovl+;hwh k viamental fre 9 lh1 )ku;v ,w(nol+pzv9iozhquency 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 ;wukb n - pp 4,enrevn(,+j5no, i3rapis $20 \; ^{\circ}C$. 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 i k8mpa//e f*dws 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 sounjhuw/3w3 bkm9d in air is 340 m/s. Whbww uk933 /hjmat 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 and the othso/ 7j,( 6 bv5lwk locn l0p;/xgvt2pyer is closed on one end. If the fundamental frequencytw l y,bo( pj ;/6vl0 l5vsgnpkox/c72 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 80uhmqfm/*j9 e o; ip*1b0 Hz in air where the velocity of sound is 340 m/s. How muj;m 1bquo*/ feim*h 9pch 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 plak1;4gb 8zqg1e mwm5iz ced side 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 detects liti1 g k1 4;qeb5mg8wzmztle 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 frequen1c;uqaz5 pe o6cy?

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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 tunts6) e*saj1p ne the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the f*p6t naes 1)sjrequency 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 respectki7lb7 b wqh z937xy u,kgt,rt.j5yn8 ively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 3ing yljzu. kbq 8xhbw7ty ,rt,539k7 740 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;v*t mqe1uozxz)+0cl c q5o8n found to produce a beat frequency of 2 Hz when a frequency of 660 Hz nclz) 8vmquoqextz1* +0;o c5is 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 approachea +ht)0 5:ln bmmuu:rsr(dq (qkul3o*s a stationary 1000-Hz sound source at twice the speed of sound. The observer hears a frla d3m r+q :tm:0)loqur(k u(sn h*bu5equency 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 (normtb aitlt(t68.g diu20 al frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears b2 .(al8 gutit6 td0tia 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 frequeccwovoq :kt 29 ;*xs6ancy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s.6tx;ov9w2 skoc* qca:)

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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 c* :0 c- jpktmzq*geqep. ,x6n800-Hz siren. It is traveling 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 obseqj,z* tgq*k 6nce:0.-e xcpmprver 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 approan.ec1z-hpn 7 t8k4jdz ches with a speed of 30 m/s. The frequency of the train horn is 600 Hz pn-c 4j k.d7nh t1zz8eand 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 b ;qsg3w0h ah)s f-g d+vn9lb,toward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed obqla-v d ,+3)b9h0fssgn;h gw f 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 toward a stationary train. The train blows its 400-H9 pi:hnxs, x;lz whistle. Take the speed of sound to be 340 m/s :ih,;lns9xpx. 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 km/h. The tra,5aqf sqe3 *pp2v wdzl-3z1 rxin blows its 400-Hz whistle. Take the speed 3dq,wzplveq sr5z-* fpa 3 21xof 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 1vm(id1 kw . cowvk1pa4m1 b:a/adu o-(20 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 freq4 1w p1adkaov1ocm -dv(k :iba.um/ w(uency 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 ilp/ 6vy6mf9f ks 500 Hz. Assume the speed of sound in air is 340 m/s. What is the fre/6pfmly9 k6vf quency 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 Hz. Assume the speed of sound :g tqz 4x0fs4ein air is 340 m/s. What is the fr: 4qx4tf0gze sequency 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 speed of an object. A 40-kHz signal is)bh:yh8tarxf,7 3 oowt jbn)5 sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. Hxwto,af b: 85)t7)hhn y3obrj ow 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 xd47u5h+w4. p)y hm uhlugj o8qw(:lrshock 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 8ugvxmhug)g1 8 z9r-+0ra1e xyqta9 b of Mach 1.4. What is the half-angle of the conical shock wug1)r1m9hx8byr 0+ z va t9ex8u -qggaave 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 S1.ggpu1 me/s p ov: :o g,,wqh;btzo;wtates to Europe with a Mach number of 1.05 where the air tem e zgg g :vs1qb o;,owp:mo;u,w/.ph1tperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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