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习题练习：Physics Unit12: Sound
本习题练习试卷来源于题库网 (https://tiku.one)， 为试卷打印版，您也可以在网站平台(https://tiku.one/)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://tiku.one/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: admin  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 followidfe9d+*f 0gq1c upax(ng is a 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 conducted fastest throu e) v22nq rsa)1 basbt-fic5j2gh

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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 stbkudnc*7e 6( beel 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 happ*ul, nhh 5d7ueens to the velocity of sound? (Assume that all other 7 hlu*5hed,nufactors 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 200fbcycbv)cyd .a8( 6 q79jx7us5ahzu + Hz sound through air iqcfx+(7uyb5c8 )s j .bu9vz7ahd yca6 s

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelej:0/g.1i4rmqsyvu qx s r8/sangth of a 400 Hz sound, the wavelength of a 200 Hz sound in air isamrr:.1y 4ivg0q/xju/s 8sqs

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with fre ax;+kpq*.xgn3 )qfi 8u nuoe9quencies 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 2n1gnma/(;s gik .6o ap0 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. Ivoj+p/ z:0l agf you move to a point twice as 0:v+l ogzj p/afar away from the source, 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 wg;tr(foedz 9jc 9yp17 ljik,:aves, intensity 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 qb jl4aucg(c60pn m +6v1 -a(pes5az yI. What is the intensity at a distance 2 j6alncg4-0m(+pab6e5q cvuaz y1 s(pd 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 fp:3uomeq 4 22bj:/wxjyhivy 1 rom a sound source that is radiating equally in all directions. What happens to the intensity of the sounx jy/yw2:3pqve12hmoi bj 4u:d? 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 in a8 -;/yquuef (qn2qz6 gpuw pz/ll directions. What happens to the intensity level of the sound? y q(zup gu/w;n-q/ep6quz 8f2It 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 irj)sg*q 9p( twncreases as 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 emitti (1 xlpv6xgtjli3qz.ai3b.3 tng a pure tone. What characteristic of the sou1xpiv( tj. la3bi gt3.l6 xz3qnd 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 musical vh qj+,4wnehy n h5)9wnote?

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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 not;+ybwn*12 vxxu.chdm8o 1p gme?

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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 we dm -v qs1 8t vpv:56k 0y20fw9alrbaw-aql;jater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wave+hn gz)0 78kyw 6xhc -wtwamdkikn00*s 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 generate**yvcezo4i m m1+6 crud by the guitar as a result of ve6cryzi u+1o*mm c4*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 open at bohro k+k gwv 3tldy.0.1th 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 threeqkz.v l 5fwib.w)x:70yx )wq r lowest tx)wb7zi :yxk .q5.)fl vwwr0qones 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 24qfa4*oy-n a- 6e 5xtmu.boxg00 Hz. Which one of the following frequen.f b*-u e-gxo44yanox atmq65 cies 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 bpuk c4n 85n.l,dvzl229 pssbresonating at its fundamental frequency. Which statement is cks ,s puzcnd45 8l.bp2nblv9 2orrect?

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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*ndef: 5t.t5cdn+ pii; pbcn9 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 thpjo 9s69p5 og ,hjewy5-aqejanh d): 0e wavelengths of the three lowest tones produced by this pi )yephj 5h0a69d -5aqjn 9ogosw,e:jppe?

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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. Which of tmw)/0(olcz7:peb x7 9cijfyy he following j)(ycb 7y p9oxl7wcm/e 0f i:zfrequencies 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 resonating at it.i 5((xrt)3yab(sm v)a h /xxcm p5wnas fundamental frequency. Whi5crix/mbta .a( (5xnmps))xw yv3ha(ch statement 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 source. Each ;)k lby0l.4bn;wut 4b emnj ;tspeaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. Thebn jl;e ;ut;y404mnb)bk .lwt 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 gllxg+(6dg,:nxgf d2 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 fr smzg ,-7 j0ks)xio0p 0nsip;eequency is heard. What happens to the beat frequency if the frequency of one of the tipgo0,zx i 0jsskn;p 0m)e 7-sones 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 explainsv+ m:d- /bygczim8 , is5tvl9n

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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 7 2,le7uz uzy-vil3ufheard by the observer3u u yzf-,i7 lu2ze7vl 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 frequenka*ppr. y8ww-cy heard by the obswa -yrp.wp 8*kerver 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 hal-v ,b+ a iig8lw,o1tgq xjt29qf-angle will decrease by a factoq ,wi8 v1 q2+jgobtl9i-t,xagr 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. What i)6b g ar5v.x t-0 k1cbwmt3jafs the air tem1.-j tmvf5bt0r x3 6bck) aawgperature?

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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 th pn-e0e.j 1zn:s77 ikamfoy:n e speed of 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 is 340 m/s, a bat emits a shriek whgm 3i)/b8 c t4becmgn/ose echo reaches it 0.0250 s later. How far away was the object that refnmgcb83gt) /ebci/4 m lected 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. Thslqam(s 4t+*4/gsd 5xe u-cn-xc b yl+e 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 st1t-dm-fpa4.l s07m9ny,pefyx) op b after seeing a flash of lightning, the distance to the lighyoe.0mf ,f-)dn p1xa ytp pm4l-7ts 9btning 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 a day the temperature /5zld( b5:r rwxgz9fkis $15 \; ^{\circ}C$. 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 dee:r1hs wp-0 ,n6qqmqggc /ac6+vl /v ehp well and hear the splash 2.5 s later. How deep is the well? (Ignore //1 ,wvhn-qga0evrc:p + gc 66qslmhq air resistance, 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 wave of frequenc-r5yh+c:reil* 6ma fb xtv7ud;kk 4m) y 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 at 9kt(4k 8 .vli,xcpri i$23 \; ^{\circ}C$ 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 vnvg:js :jp )z+ve x68p c1mr2intensity $10^{-3} \; W/m^{2}$?

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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-df1*ej .cmoi 1nB 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 soue f-y5 5yuyaz7;gw z/pnds with intensity levels of 70 dB anyez5 ;p/u5ywfa7 -y zgd 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 gar2e,/xbo y *hubage is 100 dB. What is the intensity level generated byux2*,hy /eo bb 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 x:; -.y h m-hpsy7hsut vhm7jrfdqh9+0p.1 ku m from a source that is radiating equally in j kurvf+s7-hy7 m. :m9sh1- ;phhuxd0 q.thpyall 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 from a source tha7 cb a*qi9; yymr:ytu60lub+ qt is radiating equally in y079ymq br; c6 +:a ul*biqutyall 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, whwgbsq2089.d z c/wkl0/ osx kvich is assumed to be uniformly distributed in all directions. What is s8vs 2.wwbd/0/q kczo9gk 0xlthe 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 fro 705ob*d52wuhtilhg 8ik nk8pm a barking dog. What would be the intensity level if two identical dogs very close to each oth o n*ht5 ulh 028gk8pk5bidiw7er 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 s/c,0atw, xms (3w tenxource the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sourctn,/s,c3 a ww0mx(ex te 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 9.jdpn;svtl .-33hef+h+ bov ( l6 fiui;-hxzt5 dB. At what distance will it+zjis3v f;fb-th li3-d .(h+ 6th;pe.uon xl v 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 c8 8h3kuu 6x )ful2rgebomplex tone has a frequency of 1200 Hz. What is the frequency of the four lkb8g2r3uf )u6euh8xth 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 harmonic of an open pipe is 900 Hz. Whsf6m *+rhvra-v -.tk bat is the length of thrh+tv r fv*k6-absm -.e 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 is 400 c:w) k atz o1wtqh1(k0Hz. What is the frequency of the lowest tone that willk w1z:1ahkw0otct( q) 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 lengrt/tv7fd3ik g7+) ohh th of 0.80 m. If the velocity of sound in air is 340 m/s, what is the fr /vdit7o)f7rk3 +thhgequency 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 sg 8txwru 2p8.a 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 end is 330 . -djg+bnu gfkeffdft/ 1( 7l1Hz. What is the frequency of the thir/ 1d+7u1gf(fbtf -n gdkl.fj ed 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 sho u;hmlu2c2 3ub/jik4:( b gavnrtest pipe closed on one end that will have a fundamen / 4l;ngu ja(mvbikbcuh:3u22tal frequency 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 i ;)9buew 1v(jzmjyfv*s $20 \; ^{\circ}C$. 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 temperat6 gvhu:+ n5;sve8xopkure 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 sound in air in j ob;6y;+slhg msm h(c2b)x;1r2lx is 340 m/s. 62 jolgc bsx+lx ;mb(n sm2y)1;;hrhi 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 d gshwzksz71wm,za5 61 5loe4 closed on one end.zwl451 s, eo5md67gwz 1kshaz 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 a t 3bsgz(u7vauo1 nm3+ggp*q 2ir where the velocity of sound is 340 m/s. How much farther back would source 1 have to b7o gnz+(t *gqbp u3mau1s g2v3e 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 k; k-tjc;/- gg)plkbzthe 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 thekt)bz-k;-;j/gc plkg 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 frequrymhk lb2f7 1gjv a.h*5l5*t eency?

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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-s+a u10:otqabb:z(z vHz tuning fork to tune the frequency of a musical instrument. If: zsaobbv0 a:u+t1( qz the tuner hears 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 thdc2+;ccixkglgl5j :50j ch)k zak -d5e sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is hd ljj kgcl5c)dc25x+ z5:ikkc 0ga-h;eard 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 foundgkvy o*c9 sd 2e6m4:nh to produce a beat frequency of 2 Hz when a frequency of g4:scdo yhekvn6* m29660 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 stat3fyo5;icqdrmn.cd9zux*:44x ya .n z ionary 1000-Hz sound source at twice the speed of sound. The observdz9o.u ciz5n4faxc.* my :43ndqxry;er 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) approaches a stationary0zvgd.u,;kig1 p i(pl7o /emf observer at one-halkvu m g;p/pigid(lz 0, e.17off 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 100lsv 3ixuv kj5: 7ozx8/0 Hz. If a listener moves with a speed of 30 m/s away from the source, what is tlx/v zi875:kv j3ox suhe 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 a day l7 ajri+-8 ovfwhen the speed of sound thrv8f+aj-o r i7lough 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 te97kvy90d 2o rfwy1ysrain approaches with a speed of 30 m/s. The freque ky d y9se2r7vfw0oy91ncy 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 you at 120 km/h. The train blows its 400-Hz whioku 8d*u*k,tum/o zy 3stle. Take the speed of soud*uk z */o38uu,k oytmnd 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. Th w6jervmo6c*27g 27kreu f yxq4 pk*+be train blows its 400-Hz wh 6mcfvbk4k x 7py*e+wrgj2 ou27e r*6qistle. Take the speed of sound to be 340 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. The train blows its 400-Hz whi(bjbt/erba.r jcn9td.0yek-3 3 evt- 3wyj s/ stle. Take the speed of sound to be bc-sejry-njr/39. 0dte /vj( tbw. t a3beky3340 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 120 km/h. It blows its whistl a l)qqc;dsq-x/ *k4 afn5,yloe, and you hq)qaaf-y,lx nkos4;* c/l5dq ear a tone of 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 Hz. Assume the spewwhji )ezzfu: 81-kob 0vey1 9ed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the traz1b:wew19hju8 0f yz veik)-oin 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. ;n,1fcvj mxa .:hr4jtAssume the speed of sound in air is 340 m/s. What is t;tr1 fcjjmx .h4:n,avhe frequency 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 signphlrl; y7z ,+8zwt7 nval is sent out, and a 42-kHz signal is returned. Assume the speed oh78, vn wzytp+l7r;zlf 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 a-7 1d *sbyvryi6pyp3 dircraft 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 rv5 nr). 6jbdlis the half-angle of the conical shock drb . vn)65lrjwave 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 frofl11l5 xo h;pqm the United States to Europe with a Mach number of 1.05 where l5l11oxp hf ;qthe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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