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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 falh0i*rt5.lp.q de: ys zse 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 condzr8 jsn u8:b7aucted 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 soundc3e5.a mqi 1yk in 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 velocity of so.. un)1iis-)txd s61 l;gfeip v/ tobpund? (Assume that all other factors remain constantlvg ttfo.p1)s.6i i1- unb pse /x)i;d.)

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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 souc twk cr,gtfw*-pwc.yckd ((2291 mo wnd, the velocity of a 200 Hz sound through air d wy2gp( w2w kwc-,c.tftm 1k(*9rcco 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 Hze du7lmsa 0(:ubw5k 2grmo 4h) sound, the wavelength of a 200 Hz sound in aum7b2s0muwe4(5 da hl): ogrk ir 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 20,000 Hz are3u,2p ggwg,mdw v+-m x 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 20ow*9somr tlc wzu-8r1 m7hka8 k*/ xk0 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 emitz ae hofxnep33oq-p+4 ;hm: l1tv*b2rting waves uniformly in all directions. If you move to a point twice as far away from the source, the frqfez -*3 pnmva ;1ox+h et2:blh4 3rpoequency 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 pgt;cmwkuxs k6,6xv8wy e* (;kroportional 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 souv ln*p1) 6f:+cxtpy itrce is I. What is the intensity at a distance 2d from tt)f6ci pt+y px1vn *l:he 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 ise,dow(vt emu02kiy 1 5 radiating equally in all directions. What happens to (01y,d vu2ekoit 5emwthe 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 distx-gb,7 vza8.oq6)ly *xp:m8p rg nwkh ance from a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It dropm k*n,8g)a8lx-b6 yo:7 rx.hpv wpgqzs 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 asz igogeri1r7k/2 jk (y 6lwdqx5e1l/2 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. What characterhr ,j..2lkl0vgjkj*f ad2o j(istic of the sound i j,l2vjd*lrko(g20j . .fah kjncreases?

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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 non bezz6n5y3u3h i6v8 i4 nyt 9;xfmrr6te?

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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 ndtc35ml/m+ o n d1av2cote?

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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+4qs9 onx/ fin w1srl) 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 s8hzag )2ao :8aht xz0waves 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 guitami3hm fqf2- 6ar string and the sound wave generated by the guitar as a result of this vibration. Wqi32 afmf- m6hhat 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 wu hc nwg 7;e,8z*wmm(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 thvz.ky37w6(rcs oo sb /e wavelengths of the three lowest tones produced b.3vs 7krbo6/s yoz (wcy 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 i2y6kd1f4 uow w;yalh ,n an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in 6k y o2lw,fywa4;1dhuthe 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 res8b mn 1sdlhx 5z xa2+bzjg9wq /s((m2jonating at its fundamental frequency. Which statement is corbz(jls x2+qzmw1mx 8j 5agd(n 9bhs/2rect?

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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-tc -g pzl42mh 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 lp*: :ehv d,dh7hna 1exowest tones produced by this pipe?:h n7dh dvxe1*,e:a ph

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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 inn- qr)tylvj 1b+*tk5z a closed pipe of length L is 200 Hz. Which of the following fr 5lzb )jvq1 k*tr+nt-yequencies 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+w w (u 62jn*: /tygicn3ub6(gk kquch at one end is resonating at its fundamental frequency. Which statem b/ iy hct3j(u(gknw *:n6guqc6w2k +uent 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 same sev+ +y0ioh5 lkource. Each speaker produces a tone with a frequency of 200 Hz on a day w+kie h0vl+5yo hen 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 beaj *uk 8ggcu13j.anl7 tts, 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 is hea48;r q q+wczp ejfteos0c9* ,lrd. What e,ql e 80qo;w*ptz+ cf r4cjs9happens 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 w8y4dwqbg+, cs

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approacs * o7mc91xij+i;uugniut l :8hes a stationary observer. The frequency heard by the obser uoni8cx ugii:jl7us 1;+mt* 9ver 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 ob9hi3m -vnh y1ci/upk:*dh- :zo. amnsserver. The frequency heard by the observm:*3i z:nhh km9yd n/.v u1-oisa -pcher 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,il lg :4i5ws v7pu(ul+ its half-angle will decrease by a facto i ps4vu+wl:ui5lg(7lr 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 inuy.wl/v xn95 z6 -khzm air is 352 m/s. What is the air temperaturnx./w6-hm9uvl k zz y5e?

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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 at iev5+79 ud(jdpc *ock $0 \; ^{\circ}C$ 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 soun duub:g9a8nx1 d in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was 8a1db9uun g :xthe 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 tempe c57hr9n v(ciumm*e2 j+*)c(bnf im vurature 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 distance to th5 xe sq2n:yhk9p7k/toe lightning sh/kynt: s5e9p k27xqotrike 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 syp19j 7j gi*,ywhvjp- 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 d6qj0blqr -1h 2:c;5ypab t( g7 xuhhbdeep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 345pqhuxq( -dat h7:j6byhg br2;l c01b0 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 frequency 500 Hzll-b-q/xpnb2to 0 z/ h 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 36iicseo )kv /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 intec,m;5mxc-xztgffdsh x: r02 4 nsity $10^{-3} \; W/m^{2}$?

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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 l:7hic8 p6jyznwy *5 asound?

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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 0s nmc(r5uj a(kwh)b 2ai05r ithe intensities of two sounds with intensity levels of 70 dB ana05mwj)as25 (ic0k rnrb iu (hd 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 the intens,7/td6eii pw,p.x ddoity level generated by i7d pde w.ptio6d/x,, 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 from a source that is radiating equal r31di8qsoaz- 3 :z vfvx1pn5b(zkbs 6ly in allrszoq3zs av:bvz5b (pk- 1dn18 i63fx directions 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 fro l::dg0;8vnd g oaf)tom a source that is radiating equally in all direct 8;: g)g0dan vl:odoftions 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 assuma c/0one-es/ a.fa/iz ed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the dcz fis/./onae0a/ea- og?

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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 a psi;w6dzr9hu 3l1bty+i6 kd 0t a distance 5.00 m from a barking dog. What would be the intensitwb91h uktdd y06;6r izl 3s+ipy 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 ur1,v*z4dn)ugy;ztn 6e x+ niz5w b)t 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 direcexzw,nz*n) 4ib;nd5rt)t gyuv u+z61 tions.

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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 poin9w-j8vyju/:.1v pa*fdu k/q:afgfz jt source is 95 dB. At what distance will it.:8d/q f:a9j-*g jvpzkuau f/1wfj vy be 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 12qp6qk0scg:qs,k ,v m z 4f3zvq,pl+4 gyb 3lt000 Hz. What is the frequency of the fourth harmo s: kqct34ks+g lqb z0vp4z,6vf,pmqq30gy, lnic?

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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 Hi :im,g9x.lx7xqz le7z. What is the length of the pip:i lx7lmzqe9x g., 7ixe?

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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 resonejd(d 8silvkjkx*82 9 7m5dxwate in an open pipe of length L is 400 Hz. What is the frequency of the lowest 5kidkjes* l2 mw ddj8x 97v(8xtone 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 of 0.8umi(i 65 +j0(uphekyi7w cv g)0 m. If the velocity of sound in air is 340 m/s, whawj+icuiehv(u) y07kgm 6p 5(i t 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 the tempera2ni ap* /rq,b/ txk-r *7vylxqture 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 end is 330 Hz. What je ;th**q, cwo2e,w, bbe7kt ais the frequency of the thik7bc oe *w ,q,2;awhtb,ej t*erd 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 r o; 3duco-m,4mvj+ txshortest pipe closed on one end that will have a fundamental frequency x+mmoc4u3,t j;ovd r-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 r + xtyi25nk8aooom 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 temperatureyl(e ;8ow7)n bgiy3w1 td;y fc 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 sou r.wfga* jl+pj, 6oi6p/* zh8hks0 e.e *npdodnd in air is 340 m/s. W* z pwee 6fo pjd..,lj*/hih6r nag+kos 80*pdhat 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 clx f o78-qob/.qsuj 9fwosed on one / -jq9 ofwqfsx7ou 8b.end. If the fundamental 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 velocitoe *e; /lc)7zo+lxxeq l5ye4j y 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 hear no so/eeqex4 5 yoox7;*+ze jl c)llund?

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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 s+9 t1 mt u:2dfjn*eokoide 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 little or no sound, which of the following is a possible the distance from the person to tmn+eto uj:ft2 9k1od *he 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 Hb q)0. kka;ydkz and 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-Hz tuo/nc,p urd,k4q49im vw ek 87sning fork to tune the frequency of a musical instrument. If the tuner hep8ki 9 v,7,u w4do qrskm/n4ecars a beat frequency of 2 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 t6 9cu(ypw ka; fha7z0lhe sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day wh(zup7a6l9wha 0;yfk c en 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 inkcnd.m3kk1 efp cv;w:+u ev4: an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. Wha4k m n;+pc ve1v:3efc.ukdk:wt 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 statid9co,kx2 xq ud6yg3 b8ae)*m yonary 1000-Hz sound source at twice the speed of sound. The observer hd2yqg *kye c6xd,ma)ou9 x38bears 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) approaches a stationary o*q7vlqx h)s 6rw k,m2xea 7n9sbserver at one-half the speed of sound. The observer hevk*9la77sr, q )hx2s nxw6mqears 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 of3ymogqy88ro b8y y mtc/ .u//f 30 m/s awa8mogqf.8b 3y/ umry//o8tycy y 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 travelingeskfsibx 5e *j;:j*i3(iq.ho kje4 z+ 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 ssj3* qf;ixk oi5jbezis+:h k e4(e.j *tanding 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 acy )zt, g9(fhb6xi ,fwpproaches with a speed of 30 m/s. The frequency of the trbh,xi c)f9 w6tf g(zy,ain 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 you at 120 km/h. The train bl;4nlz r d3 c2-*vi* rppvff.deows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?;4*- 2e .cp ldipzffvdvrn3r*

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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. Thl/ga d ne;qg,5y8iz,o* a:bxje train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do youo*axey :,,d8nzga l5 ji/bgq; 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 train blows its 400-Hqg6as d;w69cz z whist6q; 6dcz9sagw le. 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 4ey c9vlx6 p o8y5rpje1z(1dzeeuv82you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed ofrlz58cze8e u1 1v9edx6(y2jpyp4eov 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 Hz. Assume the speed c,h zkda7 s 61bo26tmtuk/xv9of sound in air is 340 m/s. What is the frequency heard ,kd t o9t6c6b1/2su vzha7mkx 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. Assu. :lvg5(-pwbn gjo0 neme the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a -:e .ob 5wgp lgn(0vjnspeed 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 ofzdg.2j, xgx9acs* a 2a 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 object dca xgsgj.9 za2*a ,x2moving?

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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 supersoni d- xe b5s- /s,w g7q6rfkgb.fcq4x:vmc 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 1.4. What is the half-angle o6xuy.rx +et07ucgq-ef the conical shock wave formr0xe-x t 7e6gq+.yu uced?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flie*7 2fivox4qb2wvrg 1a s from the United States to Europe with a Mach number of 1.05 where the airr2 qgfaxi1v*o2 7 v4bw temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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