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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://autodiscover.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://autodiscover.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 staelz9wg 37xt1v tement?

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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 cy(oyz - -cww;oq0l lot.s- dc/onducted 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 sn pz 4bcu-nr6ho7988c pu)uoc jn ;xw:y6ugx .teel 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 hap p*-jxz8lns+ mpens to the velocity of sound? (Assume that all othnl- +jp8sz xm*er 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 Hzcsyk6:r1im) n lqa( 8tk1gt:h sound throuktr( tl:a): 61skhmcy8g 1inqgh 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 8)2 cn,burxl iHz sound, the wavelength of a 200 Hz sound in air xlb 2i,ru)cn8 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 acs+3hkn8a +irk707 2 wltxwdfrequencies 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 thanu.b jx6w)gp+k;v;4 jkrcclm; 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 un, otdd:gr5x34 dy*7odkbsy ;)s.zx kaiformly in all directions. If you move to a point twice as far away from the source, the frequency ofxtka5 gdrk:d7bx*y ;34)sd,yosz.od 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 pr5hm mq-)dr3l voportional 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 diy97kj3e/tt q vx27r h3qr c+aistance d from the source is I. What is the intensity at a distance 2d from the source yre2t/9c7v i 7qkqxth +3ra3j?

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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 radibrmx2akg. cgu m z /7ayvq:9unzz ( 9trr/08x)ating equally in all directions. What happens to the intensity of the sound? Imgzxu./x8) q gzmv0zb/ r 7( t99ync:a kau2rrt 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 gxg: ,vb8yfj7source that is radiating equally in all directions. What happens to the fb 7xgjy :vg,8intensity 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 c2og ji6sa0 2lbecomes 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. Whaflaij +p 8h;:(l)leqs t characteristic of the e:fl j;a lh8)pqis +(lsound 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"m;* d1p;hia: nqjou, n of a musical 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 musical notegi sx/4e*ybg 4yet .:g?

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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 intoj(. vvu lw:hvc u55zm 5i1/ttx water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemekp((qa bl1za j)2: d)wbdkky- nt 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 stri9yb pnv/ji;i g2+ mj -i-ch6dwng and the sound wave generated by the guitar as a result of this vibration. What do thesibh 6ijn/ig-m2y9 j-pc; dw v+e 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 7itb1v9opvgx1(r qc-s0 j4et 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 three l ,sv/-pvf4ks towest tones produced by this pis4pfv,/k s- vtpe?

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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 /,sxdz8 hq f3;oy zeuh.;qdptp(4k z3of length L is 200 Hz. Which one of the following frequencies will not resxqeqhs4zu,h .ypz8oz/ t3;3 d ;dkp(fonate 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 fundamental frequs):ohvl )qid g4j4p/j ency. Which statem)iq/jlv4: j hsgdop4 )ent 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 one end a * t;z* 2ie,y sbi,y//-)fsucki. uekltayyg 5nd 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 arhbj n1hi3l5a c 88mp6ee the wavelengths of the three lowest tones produced nj3la 8 18m5h hipc6beby 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 resonaecs/9btu i; w5te in a closed pipe of length L is 200 Hz. Which of the followb c5w/t ;eu9siing 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 end is resonaua xr*30cf nnl ie2:1 gfx cbmh-gi+,,ting at its fundamental frequency. Which statement is correc1egi g0,+,:-*xuxmcbna2f rcl h3fi nt?

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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 thehb anmv irqe qiq5vt*y:4 02,2 same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The persa5 v4q0,qbimv q:ty2hi* nre2on 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 shouj/* xy d+8xw:, u*dv0yp /stupbnq6p zld 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 sounde bdu a +h:,hea.tsx+d(d together and a particular beat frequency is heard. W: ,+dhe(buxa+ta.sh dhat 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 explain 6cux yi:d+d /y,7uaves

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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 heapd nrt7j*k;-q rd by the obsek ;7jpndq-* trrver 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 stationas de:zsa omoh+96kv q.bm5e 11ry observer. The frequency heard by the observer izs 1 ao6e5+sqk9m:db m.o he1vs

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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 has-q zi *+ezop7lf-angle will decrease by a fase qo*i+-z7p zctor 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.lshny0 t)bqx9+0( slp )neba+ What is xb9ls ys )n+q( 0tph+le )an0bthe 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 of sound in air ab,jab/o sx6 0i(r8og)leb 0n ct $0 \; ^{\circ}C$ 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 who;j ou+d jzaa,i gy77/t mdgt2+ 8udc4tse echo reaches it 0.acymdggj z/o7tju,84 ad; t+i27dt+u0250 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 cliff, and hear the echo in 4.00 s. The temperature7-noyfd )7sly qt o5/w 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 lighxls2aecs7 i/ /ikb()t tning, the distance to the lightning strike is abous(xc b)t l2eki//asi7t

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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 -6326 mk w czmuyp4wtefrom 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 later. H*i54 9mon/8 hgl als 2bkfwj0kox,vl-ow deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 l2bl-kwk0iah g8nml5js4 9*ovf,/o x 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 a31 dnpkq( 7scisjfx3l*nc, f nrf0f)8 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 air;nxa 3anojqjq,k- xrfk 5)c )fq3, d:r 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 levelkf re-5a-a.dq 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-dB soun8vwpb qlqig1i 9o*:;x2r(ztad?

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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 intensitie2dk51 abgmo q we2n*r7s of two sounds with intensity levels of 70 dB and 40 dB?grand21 7*5bkm2o wqe

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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 intensity ws7 r t pa(sv0 cx2 np+idw;:o1;wj(hclevel generated by one engino0icwdt; vj p x: ;sswa(2 +wrnh17(cpe?

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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 radiacx8e1 xm +48zjnrhvioe7+7a lting equally in all direczcr+4nix xee78mj 7 lh+ a18ovtions 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 ra ucf0b2 k+ l0x :yv3baja/4/ik6cxyuldiating equally in avukk /b+f34:2x/ica y60 lauycl j0bx 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 abx:6nno,lyeq8oybz9dt y xexd2 . m97) out 1 mW of power, which is assumed to be uniformly distributed in all directions. What is tnz2)exym en7,o9dq 6d:9ytxxobl .8yhe 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 distance 5.0y3w(8is jv27 /bnx4q rgvmc 0e0 m from a barking dog. What would be the 82j3/b7ewn iv vy( 4 cxsm0grqintensity 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 level is 60 dB. What is3i;j; m65fscz ikqx,y the intensity level (in dB) at a pointcif6q; 5ksjmy 3zx,;i 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 level 5.0 jyorps3v (f32m from a point source is 95 dB. At what distance will it be 75 o3fy r js(v32pdB?

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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 12w c 8n5(rkhf;a00 Hz. What is the frequ(5akhf;rc8wn ency 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 (xdpnf 4e2qf/ harmonic of an open pipe is 900 Hz. What is the length of4f( qn/f2x ped 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 open pipe of length L ee *c2 k,eoazh)3epi2fwu5i/ is 400 Hz. What is the frequency of the lowest tone that will reson pafi2ec,)eew h*uz 2oie35k/ ate 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 t edukh uwy/fp(z d8e,.j/ lv;mup f741he velocity of sound in air is 340 m/s, what is theu;u f/.f8 p7jye1d h,(/zdvleuwk4p m 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 the temperature8ilmbs2 m/)v p 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 pipqn/goq sp 1ox j5.e8h-e closed at one end is 330 Hz. What is the frequency of the third harj x/ .q1hoo8enqps -g5monic?

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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 funda5 lm,3z c/g(bncmw/fp: lcxcq .d.d2o mental fre5qoccfd,m. l 2.: /cd (p3nbwx /lzcgmquency 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 i56 q z;ra7 z(ej1 hm:fcjllsy*n a room where the 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 temperature is sdy: (ljj3ck8 $20 \; ^{\circ}C$. 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 ofxwo7e ) 7 ddhj)w9ko:a sound in air is 340:w)ddk h7ewa o7o)jx9 m/s. What 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 other is closed on jl9gt(ystv( 0(c*zh e one end. If the fundamental f*0ev(t( gh9jcz ty(slrequency 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 frequencw; f,)6ya 9jpnlj9q niy of 800 Hz in air where the velocity of sound is 340 m/s 9 npq)ya,;96iwjlf jn. 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 driven by the same fr uoccmrr51(qne.i/cw(rj 35yequency 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 fro5ynmc c c1r /eowr (qu.(ij5r3m 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 frequenc pw+oqkc0pw 4)y?

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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 55.17h(o- d+j3deozro q pwb;oh 0-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of t.orho;7eo 1zbhddqj3w+(-p o he 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 adho+a8gw/cw7 nd 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?w +dw/g7 ac8ho

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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 j0m 9n 9uo/: dpwvkku9bi*g,jare found to producmv 0u,kdi b kjo9u:gjp9w9 n/*e 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 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 1000-Hz soundv)ft n jdz9h 9i6d,g-p source at twice the speed of sound. The observer hears9g- fn)d6,v9i t pdzjh 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 (normal frequency of 1000 Hz) approp.pwz6koyh51* y rk- g .n0frnaches a stationary observer at one-half the spee1 fzh5r*p. -gwo .0prnyknk6y d 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 frequen pfrz.8f , dd6yqh)fr 8,jk1yzcy of 1000 Hz. If a listener moves with a speed of 30 m/s away yy1f.8z jf8rzhrdq, 6,)pdkf from 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 x9u4oo:1yvhkt(o6ap aa j;h7 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 roaxokatao9:; vh1y(7 6o hpu a4jdside. 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 st, xv7fyh3n2(yza59szotu )v9o forc5 ationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of soundv(29z st oy nar5 hvfz o59c,uo3xy7f) 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. The train bdl pg0x7e/ :qvlows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yepgqxd0: v/ l7ou 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 towai-w 4ywkzz; 2crd a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be wi ;k4cyzwz -2340 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 from you at 120 km/h. Th .)npwn zg 15 y(vtu5;sidmq*ze train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.5(p* nunsyq.;md w 15zig) tzv 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, and *fkbmq yba/9n 7g ezl+,io/c+you hear a tone of l7 ekba c+f*oqbym9g/zn/i+, 400 Hz. Take the speed of sound to be 340 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 Hzcs fkadx5;+ef;)m yiw*b9 i;r. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving awai+;5fwifsc; )b ky d;m*re xa9y 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 traindu t q89-t4ggn horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer inu 4tt9-gd 8qgf 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 deter:s 9b5vbils 6fij2s239p ktbd mine the 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 oblssb6b9: 295f idstv3 k2 pbjiject 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 supersoyfu(kur 29k p3nic 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 1.4llh*pa sr;8zu)*)b j y. What is the half-angle of the conical shock wave formeysa zb)u j)lr*l*p; 8hd?

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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 gsd2:p kty7f+1n l qz8United States to Europe with a Mach number of 1.05 where the air ft+y87g:sn12dl qzpk temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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