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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://mail.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://mail.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 stat 6l- k0fg,cri0ukui0uement?

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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 condxf kd -as4(afu4n7uz4ucted 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 s z ,m0aatry/.1od kf u(45tmzdteel 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, wn +pkj0.8scegonek 27 hat happens to the velocity of sound? (Assume that all other factors rema +.7e2s0conj8pnk egkin 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 4008 ham* 3yyja1akn ad:, Hz sound, the velocity of a 200 Hz sound throug 1:*ma,hn8 yaadky3a jh 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 40qygvqt3k l7900 Hz sound, the wavelength of a 200 Hz sound in air igkly3 79q v0qts

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenck/ va* ,dsdj 9-jonwr9ies 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 yi s 2ktu p5dv;s+x)7wless 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 emittune k2v;54 xh1 neino+f;l3bfing waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of th34unvefnx2 nhk ef5bo+ i;; l1e 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 fg)i b7r2yrs1,wlq/c ri)4gq 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 I. Wz4gd/qi7nt ;o hat is the intensity at a distance 2d fni g;z7/ q4dotrom 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 sourceqq,*k tfi j4b; that is radiating equally in all directit*qb 4qf ,i;jkons. 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 fro3 wa8x q+-wawniby48b m a sound source that is radiating equally in all directionsb+baan qw3y84ix w- w8. 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 becomet)3mq ,f pn27zav f.a.ay lyii p4uf4*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 x m0a 8:j/jolespeaker emitting a pure tone. What characteristic of the sound incrma:/el jjox8 0eases?

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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 noteeeg78:(pf hke?

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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 notem) .gk78 :wmh,gp pje p-ird;n?

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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 w2vk1( qx e6kv6 )nubwrater

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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 a1x:hipm is1d w81h 0lhre

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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 strwfgz fnfzqndg(d9q*9c m*)fos +* v03kuk()ving and the sound wave generated by the guitar as a result of this vibration. What do these tfg+qf9u0 o)zgdsm)ckqf vvdnw3** 9*(n (k fzwo 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 whichad;/qg y wx;fsz:0y7 p(jc1k ot u4kl7 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. What are the wavelengths of the three l6/4v7yush wrdowest tones produce7u s4y /hv6rdwd 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. .uxj9zs lrjc(n-l u/3 Which one of the following frequeuuzx(r/s j.3-lnjc9lncies 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 resonakm ,lqsu 3vb;hs;vt:u 6/kxh .m6)kt mting at its fundamental frequency. Which statement is 6v km .tqk6b;svmx:;,lmh3t/ uuh)kscorrect?

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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 fbfy0 chiq5 cr 6)g3b8open 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 wavelenlb5xfsp- mv8m ayx6) 2gths of the three lowest tones produced by this pipvybsx8maf)6 l mp5x- 2e?

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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 )79+ldx qhr)vr ;; tzj wk4vxu3d3saqpipe of length L is 200 Hz. Which of the following frequencies will not resonate q+z4rtdvrj7u3 dxl; awx ;3h k)svq)9 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 b a omi4wp6o6:7u(mxyat one end is resonating at its fundamental frequency. Which statement io6 b6x4am(pmo yiu: 7ws 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 v.vfj6a x)d l9speakers driven by the same source. Each speaker provld9v6)xfj a.duces 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 two saq )m4l1m2 wxih c9t/mound 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 paib w eo/b9+zm ib..8omrticular beat frequency is heard. What happenei b . z8io.bow9m/m+bs 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 explainsj 1vipmgew053m 2ib: s

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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 obs le 1c08lhk,.kvtev;x erver. The frequency heard by the obs kevhev,1.l x k8lc;t0erver 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 frequency heard by m;8gfdzzu+u bs,e/*f the of s;f/bz+ue8g z,*mdubserver 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 decrease by a b kcs)8m ;m-bn bm;nksm c)b-8factor 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 o dh9pkb0vrk /kn0 q;s+f frequency 45 kHz in air is 352 m/s. What is the air temkqsb;0 k +/hpvdnr90k perature?

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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 *o .)c czi7klag9d)ls a+p6pe 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 ird;;e p/e0)mlmr5 8 1 fc x+,xlwczvjzs 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object ;pr+jemr,w df z);v1 5mze/xll cx0c8 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 temperature is ge,4duomi7.yztmef:0t+m5 y qr9sj5 $0 \; ^{\circ}C$. 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 s- 0 l+ 5jl:k5grg*8ql--zony ticlkyg eeing a flash of lightning, the distance to the lightninq8-0krzo l ggi ylc tk-g:-lj5n+l 5y*g 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 i+ro 1bni9(,w o7 1k6hylb qqea 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. Howf: * q9nc(d(q; ptyokm8pwwf* deep is the well? (Ignore air resistance, and assume the velocity of sound is 3409qw c*:p* nt f8kfo w((;dmpyq 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 fr er*7rnt.q b)w ,-zo.u(9tl llkzclk9equency 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 airjbgjaj7.8b/* z3 y u +rpljx6z 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 with i e;ub)y*u gg gsy+- 8hlplz04xntensity $10^{-3} \; W/m^{2}$?

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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 i ih/vk +d 9s8sc+k1wqa 70-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 intensities of two sounds with intensity levels oezmqcp12 wamx48is vg *f;-j9f 70 dB2i m zcq*-ms; 981axe4wjfvg p and 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. What is thesiqj ps2t6o/ z; g/kjyu4;dza:2q8w m intensity level generated by one engiw2t; /ip; a: zs2d8ogs4jy6qm zk /uqjne?

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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 radiati 5qao l -v2omfjl3/+p.cmzro 4ng equally in all directiojom zr2-v 3aol/lof q.m4+p5cns 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 thatwc62 lqy7t1d8fh toe ( is radiating equally in all direl(qehy 8 d1t67wt2oc fctions 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 ishs-)0hmm1jq m32 xwl/covm 1p8gwx2r assumed to be uniformly distributed in all h m1 xwmjo10ms 2v8mwh/xlcrp)-3 2gqdirections. 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 distance 5.00 m va2)zib9+v foyxq9pgg 9 /ii+ from a barking dog. What would be the intensity level if two identical dogs very close to eac9+v i99zf poavg2/+yi ig) bqxh 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 tvjmyj) ry r/;*he intensity level is 60 dB. What is the intensij;/ rry m)*vyjty level (in dB) 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 level 5.0 m from a point source is 95 dB. At what distancem9b p u-:(pkrhc3 h/iw will it be 75 d:wh3(kmi / ur-hbppc9B?

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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 the)brgn qcb8cmaxm 2 0,8jd/yb 8 frequencyq/8 c m, dymg bajbrn)c08bx82 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 hadxx2 gi/u rn74a0oxeph1 z05armonic of an open pipe is 900 Hz. What is the length of tux1 x5r0paga h/xd0ino472ezhe 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 8j78lngr ;pm* 9.rgmlj2 myjz (vc7uupipe of length L is 400 Hz. What is the frequency of the lowest tone that will j9 mg(*pjjnm7v8z cy. l2m r78u;rgu lresonate 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 avn i e/2qd4wr:bpw8pl5(b)fft both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the secondwl8vbe (4d :5rwnf2)fpibpq/ 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 temperature ily7w:v vz03bfwr ex +u ;xp3i/s $20 \; ^{\circ}C$. 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 tenn: th3d3l +m5 0vnljhe frequency of the 5jn+3n nemv 3t d0l:lhthird 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 closegpw(ha2c(:i hkc:tjb6nit6 + d on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of st wchthn(:6i+cji(bp 2g6:k a ound 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 t(j zv5 vqkktmm-2ii- 4he 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 uw 2haz/2vbn9in 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 spe *zx)x m zbsarl.o7t:/skl izc02(tx s2oq 5)ied of sound in air is 340 m/s. What is the fundamental frequency z)0(z7s5qt2o2zl* iicl mk)x. xsroab/t :sx?

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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 ye6jo7ecf6w5cz1 p c2 vi2 jb2py1aw,other is closed on one end. If the fundamental frequency of t22aj66pjv,wc1yey7i fwp 5e1 bozcc2he 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 d7g 0i(rs 8yhisue9)y 800 Hz in air where the velocity of sound isyi )( i9d8ye 7r0uhsgs 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 driven by the same frequency of 50.ckx4g jb2h0z)1 kp ek0 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 be k0ck2jg zhx4.p1k)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 frequencc(j( tco qe5rbql ,:d,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 550-Hz tuning fork to tune thejba 5+ymkv:tr z oj8dc.5dx+ x4:(dhd frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the fre h x5c( :8:dk+dzd.mbj4t+y davrjxo5 quency 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 produceduf8xuctqq; ) 4 by two horns are 6 m and 7 m respectively. What beat frequency is heard whentq)q8fc;x u u4 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 inf)7;oq:dvpytz 8- z n .iser.p an orchestra are 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 7ir e:f.zvdstz;p 8).op -ynqwould 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 bn5ncfv;kh9;ajdq:.suwy0d 5z6 s 0 lsource at twice the speed of sound. The observerw h 0yss c q.:d;k055nvfl9j6nbadzu; 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 (normal frequency of 1000 Hz) approu c(lb.y0p-s p 8b;*rrrmlls ni4 4xi+)mjca)aches a stationary observer at one-half the speed o;8.lsr+ppirci xlm4b0n)j*4r mal)u s(b c -yf 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 moves with a speed of 30 m/ c 27scjd3dl8fuj.c8d ywnt:*s away from the source, what is the frequency heard by the observer? (The sound speedccuc wfs .ty8dl7dj* 8n: dj23 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 daj7-klh4(cxluw s id6b 2yt:ex:k fu*9y when the spe xud*uek9:b6 k-f i7ty:2 sxllw(jh4c ed 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 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 traii2efjoy(9 c9pn zkll()hgt9 0n approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz p2i0 t9yg9lof hze (k (cljn)9and 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 you at 120 km/h. The train blows itsym- 8: 4k7 gy0cxbaxxz 400-Hz whistle. Take the speed of sound to be 34ca4- 8bg0xxxky 7yzm: 0 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+d i o23ikg9d;hf n.c0ks; kjm79zzni. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you h; nk dhs; k.cdmi 3zg0k7n z+jf9oi92iear?

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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 train blows its /qrp9 909vh;;hzx-l bh gb gtn0yd9dq400-Hz whis dt9xdqy 9glg;9bh0/qr0h ;vpz 9nbh- tle. Take 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 youp +d5 yeclek3bfzv ,07q pv:.v 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 frequency of the f v, v7bd.c0k5vqp:pz+y3le ewhistle?

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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 in4uypgca cr:z ). z6u3l air is 340 m/s. 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?u :6uca4 zylczg)3 pr.

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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 w g. ao(vx-l;wis 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an obsewv.wxg;o a- l(rver 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 anc2kvq7.f-y7 zpqw4 deitxi z// mh9*q object. A 40-kHz signal is sent out,7ii7.* dqq2h cqzp/z v/x ew4f -tmyk9 and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. 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 j(+d9ct:m us 7j gu21rdi 7lval-hd9n 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 Mac9txwkm,k8zy )j ;r1mih 1.4. What is the half-angle of the conical shock , jyrmztx)wkmk; 1i98wave 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 Eur:wash0oa 8f ;q ihrc7(ope with a Mach number of 1.05 where the q;awchrh oa:is78f0( air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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