51fly国际课程 (51fly.win)

 找回密码
 立即注册

手机扫一扫，访问本页面

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp，上传完成后会在上方生成预览，用鼠标连续双击缩略图，或拖动缩略图，该图片就被绑定至本题，显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片，绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


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

标记此题
1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followin ;fcn *kymh6j6g is a false statement?

参考答案:    
标记此题
2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is conducted fac*i8shheg3: gstest through

参考答案:    
标记此题
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 steel b s ik wfa97)f3h/hl14vieca *rod?

参考答案:    
标记此题
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 happeq,kgjnj 8 o-4/p a4prbk fn8+ens to the velocity of sound? (Assume that all other factoqn/4+jk8 ,kf pn -8aj4o rbegprs remain constant.)

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocitww*u-t1sy(ldx gc 5x:tg +g/vy of a 400 Hz sound, the velocity of a 200 Hz sound through agtx-:+c v /wdt1y(*gus gw x5lir is

参考答案:    
标记此题
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 wavelengthk801pf3t2zpxzv .im e of a 200 Hz sound in air isi2pzm1t.8f3vx 0 epkz

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencies greater than 20,i)vh4h6 fbe31o3 nm1x*zwe r x000 Hz are called

参考答案:    
标记此题
8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations witlk1zw ywa,53eh frequency less than 20 Hz are called

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 a7-8w74z:fr) 5g.mfosw2s jpfs,c3r rqr h jf zll directions. If you move to a point twice as far away from the source, the frequency of the sound wilr sw rojpwrfz47-f.5q827),sh3f m sr :gcjzfl be

参考答案:    
标记此题
10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intensity is propb+8qqvfq: ; +h 0slam5gmjq4oortional to

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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. What 56q *yk b aqerch/f6a6is the intensity at a distance 2d from t6/ *fq 6cqkr5bayeh6 ahe source?

参考答案:    
标记此题
12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound u,u(9ies52eg d oe/ ijsource that is radiating equally in all directions. What happens to the in ig/du29jui eee,5(sotensity of the sound? It reduces to

参考答案:    
标记此题
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 t2uq*ozp6 ef9 what is radiating equally in all directions. zw2fu* 6qe9opWhat happens to the intensity level of the sound? It drops by

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following increases a h k94kcdxr-:nv;;qzks a sound becomes louder?

参考答案:    
标记此题
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 to acmgqx ob5224ne. What characteristic of the 2o4cam5 bqg2x sound increases?

参考答案:    
标记此题
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" ofj vl:5k4q9 /unbpvjl2x. *mfgkx2l 6m a musical note?

参考答案:    
标记此题
17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitch"9 +tecc p0c-hh of a musical note?

参考答案:    
标记此题
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from air y bkhf.)px6m+ q,q* euinto water

参考答案:    
标记此题
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacplct, 44woxs 4+gb)er ej3qp6ement waves are

参考答案:    
标记此题
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 t2: bhe2rhvuy y;;thv t,vnup (. ,ik(and the sound wave generated by the guitar as a result of this vibration. What do t ;pt2 : kthryb v2en.,iu; uy((vthvh,hese two waves have in common?

参考答案:    
标记此题
21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which4n pmde 4krcms3zh,v 6/fmzl)4wbg . * is open at both ends, there

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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-s/o6- fnle: 1 g(s(l)muun5fzwr sbu the wavelengths of the three lowest tones produced by thi-:5(zg n6r1(ulms)we- no ub/ulf ssfs pipe?

参考答案:    
标记此题
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 i wk+1 i(trf9xes 200 Hz. Which one of the following frequenciewxef+k (1ri9 ts will not resonate in the same pipe?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 frequency. r i:ufkj*+v2 f Which statement is correr +*k2iffjuv :ct?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 at the othert7alysqxc,) +uz; sc *, there

参考答案:    
标记此题
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 l+q;jy6eu*hw 6qgo i0h owest tones p0q6hw hguey +oq*j ;6iroduced by this pipe?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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. Whic:h5 dsvn/x 1hc*p dzm;h of the following frequencies will not resonate in that xds; vhn:5/ h d*z1mpcpipe?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 ar:k1 )e8z6hw4 ngxwiy t its fundamental frequency. Which sxw yh 14)wz86eg ik:rntatement is correct?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands between two speakers drivebyut 80bs cxu5*)wplzjm- 93cn by the same source. Each speaker produces a tone with a l *mc8b - jx9tz35ycp0u)wbusfrequency 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?

参考答案:    
标记此题
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 wav3ld0*j*jj-xe8b9x6b q x woxxes should have

参考答案:    
标记此题
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 c 5uow ynlz-ur u;6 *pn8sov: vvm)h)*particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is incrcsr;v wo)u uy8 l)p zvh6u-n:m**von5eased?

参考答案:    
标记此题
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explv)fvy622m 8d+*ayft si3r odyhy01p6f rtj v2 ains

参考答案:    
标记此题
33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a stationary obserz r6 jjoa21)ckp f.e/mver. The frequency heard by the obsjo/a6kp zjr mf).c1e2 erver is

参考答案:    
标记此题
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source depart e3kr,)umz+ hhs from a stationary observer. The frequency heard by the observer ) z3+hmrehuk ,is

参考答案:    
标记此题
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-s9ou f)e:j zs5hty rc*+peed, its half-angle will decrease by a factor z:j9 fuhys)o+ce5*tr of:

参考答案:    
标记此题
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. Whad7;htr y)wo m(t is the air tempeho(wm d )7yt;rrature?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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)ct(*4 slu* ewlf h*epn air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

参考答案:    
标记此题
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 )vk(nqu( g1si9b:l u*gmoa5 )cvyfv)whose echo reaches it 0.0250 s later. How far away was the objvs:mo9ck ubqn5 i* (lga))g1)y( vvf uect that reflected back the sound?

参考答案:    
标记此题
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 ech7id(ejrezoazomt:)i -93la6u we 2 (so in 4.00 s. The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

参考答案:    
标记此题
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 dist: (mcd27idc i uq:n/kzance to the lightning strike icidqn :kc 2/m7ud :(izs about

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 cliffh db85mh;jm5ib cw;4p on a day the temperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

参考答案:    
标记此题
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?

参考答案:    
标记此题
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. How oc.r , 8cwg/cpxby t:9deep is the well? (Ignore air resistance, and assume9y.bwc t c/org, 8p:xc the velocity of sound is 340 m/s.)

参考答案:    
标记此题
44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in ai23c o5xd ervc3r of a sound wave of frequency 500 Hz is

参考答案:    
标记此题
45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in air at55bz 7zqk2i.y ) tfftb $23 \; ^{\circ}C$ 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.

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity levelk8u)1 h,y:0wzu l,8h lqfc kmj of a sound with intensity $10^{-3} \; W/m^{2}$?

参考答案:    
标记此题
47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity 7q/zh 0qfbn (qof a 70-dB sound?

参考答案:    
标记此题
48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the intensities im )3ij5-:dxq nz.jeo of two sounds with intensity levels of 70 dBj).mxdqn -:ei5 zjo 3i and 40 dB?

参考答案:    
标记此题
49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines in ah9skzx ( py )n+ct1(aogc7u cey) u55k garage is 100 dB. What is the intensity levatue75gkccx (yuky nzop)h1 c5)9+ s(el generated by one engine?

参考答案:    
标记此题
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 sourcw.y/vb* fif-8ga. c yndr+c/ fe that is radiating equally in all directi-adv.f8g/i frfbcyc / .+n wy*ons is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of,m 7nk; ogi+kmnc;u xpp57 dg, 6.0 m from a source that is radiating equally in all direct do, knu+,gimp;k ;pm5c7 n7gxions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

参考答案:    
标记此题
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 assumed to be ub( hfep7t8 1psniformly distributed in all directions. What is the i the8 s7(p1bpfntensity level at a distance 5.00 m from the dog?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 from a b re- .;ag0s.icm tl;lnarking dog. What would be the intensity level if two identical dogs very nc; i gsel0.tml-r;a.close to each other are barking?

参考答案:    
标记此题
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 l2 uoci 6kfca:v29bz4 mevel is 60 dB. What is the intensity level (in d2cmabvc i 29 :46fukozB) at a point 2.0 m from the source? Assume that the source radiates equally in all directions.

参考答案:    
标记此题
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 h2qu6ljzr/:w a point source is 95 dB. At what distance will it be 75 dw6z2u:lq jrh/B?

参考答案:    
标记此题
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. Whib5 ,6rl d2gu gh63alyqle0w8at is the frequency of the fourth har 50gluia b h63l2dgl,qy6 w8ermonic?

参考答案:    
标记此题
57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonib ;:2r/f(i;;x6nzsgk vwjxlt c of an open pipe is 900 Hz. What is the lengthj; wxs /zi fnr6(v :;lxtb2gk; of the pipe?

参考答案:    
标记此题
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 400qh8kx(e0 k h+d Hz. What is the frequkxd8hhq0e+( kency of the lowest tone that will resonate in an open pipe of length 2L?

参考答案:    
标记此题
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 en:6j z0fr tt-hrjf)4enj1 m: the velocity of sound in air ise 1e6:fjf4jn0jnz) tmr-:htr 340 m/s, what is the frequency of the second harmonic?

参考答案:    
标记此题
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 roomn1nv5ac y+b 0abdd-9z+mpip- where the temperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

参考答案:    
标记此题
61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequency in a p*qrs3 k83 lwv29 cb: cxlmho5nipe closed at one end is 330 Hz. What is the frequency of the thirdl r3c o l92nh mscwq53*v:xbk8 harmonic?

参考答案:    
标记此题
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 09v7+ydqw 0 hk jtcx 9yti3dvd-dn/g ,closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sou- y 9jqh3 0+ 0dvivcdgtyxdw7d tk9/n,nd is 340 m/s?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 fy5, dz0* r e6yo:piqcv3w zq7where the temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

参考答案:    
标记此题
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 temaf1o q)o:gh 5n7spifypp6lj5 x9: m/eperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 spee*3jrm2 v2jw8-fmsx (y heebvj(+w7k m d of sound in air is 340 m/s. What is the fundamentammk2 ye(w7h 8x-*mej+2bf3jwvjr( vs l frequency?

参考答案:    
标记此题
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 v0f6snm; 9hkc is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is9cfms;h vkn 60 the fundamental frequency of the closed pipe?

参考答案:    
标记此题
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 th mdit)h5smcdwl24v: )e velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of hm)lsv4 ic :d2d)m5 wtthe sources would hear no sound?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 frequencyed1/sh z+lc 5h 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 follow1+h l5 sech/dzing is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 frequenc7 z8eanz+,w4 p4mu l/wjccy/by?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 tzeqbug70f by- uce t d-9-u6t2he frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the iuu 76-ytb et -gf29bdqec z-u0nstrument?

参考答案:    
标记此题
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 v8g s(g7bf no5respectively. What beat frequency is heard when the horns are sounde(og g58bvns 7fd on a day when the velocity of sound is 340 m/s?

参考答案:    
标记此题
72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin stn+8/v+oygd /bih0 zdurings on two violins in 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 o/h +dgd iu/z8yno0vb +ne of the strings would bring them to the same frequency?

参考答案:    
标记此题
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 +/n av hd*kao3source at twice the speed of sound. The o*kad ah/+ovn3bserver hears a frequency of

参考答案:    
标记此题
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 obse;vulr;f tba4 yh gq.wf+kgld+2 w7xo: w7* qc9rver at one-half the speed of sound. The observer hears 4b; k 7*+g q .qo;varw:g xtfcfyu2hl7ldw9w+a frequency of

参考答案:    
标记此题
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 ejcd47o 781gy5 g j0g nvf3blxdqs,c: 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 ms:c0nex vljg85qd ,y3godg4f jb717c/s.)

参考答案:    
标记此题
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.ztf ( uws r91cl/*e(qt1kxw2o It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/stcz1qlts/e rk 2o9(w*xu(1 fw. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 approm9 s*koi6ob(xjuq+x ( aches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of soi ou*(bxs+kmox jq(69und is 340 m/s.

参考答案:    
标记此题
78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward m b.0v n bwsm2qk3d 1pxp2x7 3:rmy*shyou at 120 km/h. The train blows its 400-Hz whistle. Take the speed opm nd23 m.1k y qrvs2m3x sb0:bw7*hxpf sound to be 340 m/s. What frequency do you hear?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 stqzm: zy9 tom86ationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 3408:9ym m zqt6zo m/s. What frequency do you hear?

参考答案:    
标记此题
80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you auun8jf lz:2z* y)xv1et 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you:21ujn)*zuyz lf8vx e hear?

参考答案:    
标记此题
81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away frof- 2+ *xcsgfsfh z t(2w)jxcf)m you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the f zw )g-2sc 2 sfh(x+fjx)fct*speed of sound to be 340 m/s. What is the actual frequency of the whistle?

参考答案:    
标记此题
82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train 0lj 1s qhcn7i+il-xkiv3yt6;5 q aaw *horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequenc7iqatll ixn scw6hy -15k;3 *+jqa0viy heard by an observer if the observer is moving away from the train with a speed of 30.0 m/s?

参考答案:    
标记此题
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 in air is 3, r8-sdov oyrg 8suqomm4wucgy ),8;3g+ 7w yo40 m/s. g uo7ywo4, g88o rmvs w,u-;g8q+dyy)r3csmoWhat is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?

参考答案:    
标记此题
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 hua5j.;qga 4hobject. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. Hq ;u4ag.ahh5j ow fast is the object moving?

参考答案:    
标记此题
85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conaih kjvk* m0*5ical shock wave produced by a supersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

参考答案:    
标记此题
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 ofd )xlj7;o 7f ea5ufcy1rvj* /g;t:txv the conical shock wave formed)jxv/ey5rv d g foj1tx; 7*cl: uf7a;t?

参考答案:    
标记此题
87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the00w05r dkf9fhgn. d l77yiu.nyy(an t United States to Europe with a Mach number of 1.05 where trd 7k flh 0f ty5 gay.0nniw7uynd09.(he air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

参考答案:    
  • 姓名:游客(未登录)
    •
    总分:87分 及格:52.2分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题，此次习题练习共有 87 道题
    本平台(https://autodiscover.51fly.win/)支持练习，作业与考试(自动评分)三种模式，群组成绩统计排序导出，题目动态变量实现同卷千人千题。
    如果您对本系统感兴趣，想加入我们或者想进行任何形式的合作，请加微信 skysky1258

    试卷内容到此结束!   © 2026 51fly国际课程 (https://51fly.win)版权所有

    浏览记录|手机版视频|手机版试卷|使用帮助|51fly国际课程 (https://51fly.win)

    GMT+8, 2026-4-18 08:06 , Processed in 1.139739 second(s), 215 queries , Redis On.