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
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  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 following is a falso. p/fn,e,wy6a5dkca e 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 cewd7i8(d 8m82npamxlws) bt8 gk8y;monducted fastest 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 stee.kwod (( 5r2 b+pzh,atekdz;hl rod?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 happens to the velocity 9fnr:od o:w /2flblhj7 e+ 7beof sound? (Assume that aldfo:7n:elrwo7e 2b/b+fj9 hll other factors remain constant.)

参考答案:    
标记此题
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hzc fa 6lfa9k7 5kid0yt( sound through air if6d al 9i0fktya75( kcs

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 s;uc 9z6t9w*z guwe 76iv( rgnsound, the wavelength of a 200 Hz sound in air iwe6u gn;zz v9sw9 r(u6*i7 tcgs

参考答案:    
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 20,000 jgo9) h7s ycgk*5rscj16t3y-e qi(cfHz 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 with frequency less than 20 Hz are calyv/ /et/ r)c7ic9 6 aw5vmuboaled

参考答案:    
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 unifo0/coixxv7 jz, m;.i6 :pai kw(7r kjkjrmly in all directions. If you move to a point twice as far away from the source, the freqjroxxvjip,0i;(wai76 7 kkkj: m z/. cuency of the sound will 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, intensitg2*j qpo7x9g zssv )3uy is proportional to

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 i8.5zsa h cvpfchhy83 ,s the inz vfc.c3 ahyshh858 p,tensity at a distance 2d from the source?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
标记此题
12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distani3 81auice gm(oif: 0ece from a sound source that is radiating equally in all directions. Whei me uao: f81i0cgi3(at happens to the intensity 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 dist:(uq wwx8.v zrance from a sound source that is radiating equally in all directions. What qxz( wwur.8v:happens to the intensity level of the sound? It drops by

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 as a soun1jcecs sn4xul. b334 md 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 tone. What ch d nfkkqw2.19 og+kxs((xrp(uaracteristic of thex u91dkofknqx2rw (p((s +gk. sound increases?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
标记此题
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" of a 5s.y8j plvt8i 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 ki ;k)c/obfs 85w c7th"pitch" of a musical note?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 k3u ytc-u s/x/ +e gx7k;h1ejyi :g,j17hvcebinto 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 displacement waves3pepjo h9y.x5hnj72w are

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 stringoj5-zl8tv +s ncsy 2xm)(,yd m and the sound wave generated by the guitar as a result of this vibration. What do these two waves xv co(+yd mj,2 sm5lt8ys)-znhave 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 which is open n9v 4 eueos50pat both ends, there

参考答案:    
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 areensjjgl*.w2 ( the wavelengths of the three lowest tones produced by this pipsj j n(ge*.2lwe?

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 reso8 ji5+c 8cqlqpnate in an open pipe of length L is 200 Hz. Which one of the following frequencies will i8cpl+8qq5 cj not resonate in the same pipe?

参考答案:    
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 re*:9e bems v9ehsonating at its fundamental frequency. Which statement is correct?* hsme9:eb9ve

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 whicop9kh vbk( d l.4s/qb+h is open at one end and closed at the other, there

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 area(eqgz b -va92) vs7ku the wavelengths of the three lowest tones produced b2vzg)qk79 ua(evsa-by this pipe?

参考答案:    
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. Which of th(d*zst6 he60vws q2.u ( vgzfye following freq( s2 wg ve6yhu*ftz(0qsdv z6.uencies will not resonate in that pipe?

参考答案:    
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 aoh3/0dh3v,dw :0zt-6y2glnn iz mfi f t one end is resonating at its fundamental frequency. Wwfmt-lvfiznh , 3gd:no 20h63zy 0i d/hich statement is correct?

参考答案:    
标记此题
29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands betwe 1pz lfmd+3gz6 w9(ymben two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when tg19pdm +m zl(f6z wy3bhe 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 beat-ank ch zi hn8y74+.spfys0/ ms, the two sound waves 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 togemgjdv j8g2 9.ether and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increa2gj jg.8d vm9esed?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
标记此题
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explai9wpn0kv.l nn ;ns

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 obsexg 2 j91e;)ip kndq9uerver. The frequency heard by the obserejqx2 ;udpg9n )e19kiver is

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
标记此题
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationaife5:8x)dudrux;(v o ry observer. The frequency heard by the observer isuxd(uxo5fr)d : ev;8i

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 a1z:2e xsfl,h5gtto3its MACH-speed, its half-angle will decrease by a factor a1,l:s eft2g x3zhot5of:

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 w2v*, etfrn0dt w 4og 59zgmk5352 m/s. What is the air tg,5*25g 0 mf od9ner4wk ztwtvemperature?

参考答案:    
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 irtyv uh/w(rt 8mx,; 0cn 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 emirldi ejontt *+8u 6pk9usoo 1v/io858ts a shriek whose echo reaches itur uo8j/to9k8isvi5 nl1d6 oo+*e p8t 0.0250 s later. How far away was the object that reflected back the sound?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 echo in 4.00rap:ubc r.d(ko,,,z*i *cfvn 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, tcm;s/2u9 q1. vfmt6rf3wccb ihe distance to the lightning strike is c93;v1sc6wmf i 2t/ c.fqrumbabout

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 cliff on a day the tem 2/kbip gm:l;cperature 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 deep t 7)jkytk2fl.is the well? (Ignore air resistance, and assume the velocity of sound is 340 m/s.))y tjfk.2t 7lk

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
标记此题
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 50i8wucdxp 24s ,0 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 at ,7x:r njiuym vye10.l$23 \; ^{\circ}C$ 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:    
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 level u(ln, l+qnc w v/,l 5aip t5d5hk,2irzof a sound with intensity $10^{-3} \; W/m^{2}$?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 r*9 ii(ji0hu51bpnbh of 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 inb9 c3mfe qq h7ysip 0xuvlrd;p.f:3r ,4+aga;tensities of two sounds with intensity levels of 70 dB and 40 dBpffqhs,p 3 97 rl:3;rx0g;+4bed. may uaviqc?

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 a garage is 100 dB. What is the in7dtu(moyoc7ydx,iw 6- )o2w vtensity do mc)oiy7 w-tw 7xu6ovdy(,2 level 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 sourceyqhx83qpu 6.brx h/ r5erp a7gi0/-zk that is radiating equally in all d y58u / 7xikpag -xqq63rrhh.0/ pzebrirections is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

参考答案:    
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 distan4mv u.r 5rnq;*v2jpavce of 6.0 m from a source that is radiating equally in al p4v5 vjmvr2ar.uq*; nl directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 uniformly yko/r0:t .2u*gszno q distributed in all directions. What is the intensity lz :yg/s2qut* k r.oo0nevel at a distance 5.00 m from the dog?

参考答案:    
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 di0s r:vjnh;rzim jn4d+1e37uustance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to 0n1sh 3er4 zudj; i+u 7jv:rnmeach other are barking?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 sourc fvkd(11ukp,xn 7byitk -)ewj *y.k. we the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the s1kpe)bi jw( t.,yu1w k knxky.fv-*d7 ource? 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 m6v /ll: rpw:n3rtk jd, from a point source is 95 dB. At what distance will 6:prltk w,/l :3djnrvit be 75 dB?

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 frequencyf + 2pawuv/.zi 8)z53g glljtw du)fp( of 1200 Hz. What is the frequency of the fourtf )d t+vplzuu/a .j5(wg)8zgl2p if3wh harmonic?

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 haif + /l/r7a2 *0obfv,yrop4 kfwiwb:t rmonic of an open pipe is 900 Hz. What is the length of t r0fikl2fa7/v/rw+ fo, pt* b4wy io:bhe 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 Llu 4aze38g(xb-o +hbr is 400 Hz. What is the frequenl4rb38eg a-x(ubh +zocy 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 the v:afr4z3 ( o)ly-mb kf+kjs,mrelocity of sound in air is 340 m/s, what is the frequency o azykrjr-)+ ksbf l(4mf:m,o 3f 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 room where the ,uylql+a+f t+ngw 1o tjidsk oj,/6*, 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 pipe closed at one en 1c.7cwf.x0)l 3wk (oif yglio 8xh9grd is 330 Hz. What is the frequecoi.8f(cwx0fo7h.ggyr 3i1 wxl k) 9lncy of the third harmonic?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 closed on 3 acgt4 yjav+ bxhd5m8c2sj;-one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/s?-jyhjc83+2a b 4mv5g xdt;sac

参考答案:    
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 where the temp5z yn0 :;mpv.ii j kv**n3g03vtlfu qcerature 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 temperatureq( *px,0f 7/h)uy rtwaqdtez3 is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

参考答案:    
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 lengt p)bbn lr8w,f1ia)l2m h 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundp2) mi 1lbl,)a nbf8rwamental 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 thb; ;q+s9vukt1 r)on ip7nu ,y+hyh5 hxe same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequnusuob;1p, tvqkry7n5+hh; 9iy x h+)ency 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 the veloco+dlnmvgc ti4.;(s s*kf2 +fcity of sound is 340 m/s. How much farther back would source 1 have to be moved so an mi+d(4 o 2nkfls tv*+ccsgf.;observer in front of the sources would hear no sound?

参考答案:    
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 aneageu28 n5gy3c)/m j(n xc.uhd 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 the cye)g2 m5nah uc e38gj/x (nu.other speaker? (The sound speed is 340 m/s.)

参考答案:    
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 frjnl7r5 p x/t, jiggd*uq f ;7dap*t:-qequency?

参考答案:    
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 fh4z5io )nq.wz ;60he s4ffrywork to tune the frequency of a musical instrumh so5;e4.)f0wzih6 qf4rzwnyent. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?

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(fq2g+5q+m :p2 iimt9h clykf4aw/t u 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the im2c2iy :ft q9 +k(p /5gfqmhw u4+altvelocity of sound is 340 m/s?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
标记此题
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 f v ll.1q2b9ppnn-6je an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660-lpj 2be 916qnvnf.pl Hz is played. What percentage change in the tension of one 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 source at twnti qp9/m 1s +u 4g(jj)sxgn*gice the speed of sound. The observ jngutxsg*j 9 p1)n/(i+4gq smer hears a frequency of

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 obs3d lj41t4i ,aa jytgf7erver at one-half the speed of sound. The observer hears a yjf, a3 1il47dtjt4agfrequency of

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 wi5s tz(gsi20mbth a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 ms52tiz0 bsg( m/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 8dsc**s33xu 2cam-pq:nyaai+ tyv) 0l 00-Hz siren. It is traveling 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 standing along the roadside. What chanynx :3*a a*tv +pauci qc23-dssl 0)ymge of frequency does the observer hear?

参考答案:    
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 hees nxs +;i1.ysard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the1s+ ;s.ex nisy train horn is 600 Hz and the speed of sound is 340 m/s.

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 you at 120 km/h. The train blo6qydcim y1o, d; n 2lg.)f8;kz :mkfaqws its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?dakcdiz)6 .of8lk2:;1yq fg n qym ,m;

参考答案:    
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/hg x5nt cyg4t(n9b 6if8 toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/ nty6 49g5biftx(8gncs. 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 at1bk+ xaawpg /hj p4-9u 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frpa- u+4j/xbk1 w 9apghequency do you 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 from you at 120 km/h. It blows its whistle, an+no;0 r:dgwb d0wc2kud you hear a tone of 4:d n0; db0 grwockw2+u00 Hz. Take the 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 horn is 500 Hz. Assume the speed of sound in air is 34lh 14kb p;2hbf0 e6ogh0bhhoeb4 gk10 ;lf p2h6 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?

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. Assum xublr40g(*pzfmte ;yl+ vu 0o/,w*zqe 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 speed of 30q/, p04 l(lz oy zut;mewrx+u*0gvf *b.0 m/s?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 vph.8lbf z-*n) /-; fgltgh izan object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound.8; - t) pg*nh-gfz/iv fzlblh is 345 m/s. How 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 conic 2+ry-ea (r:ae7 dkhbaal 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 b4lu9et6evx- o,i)rsdd 742kpmw.i hjn7o +p1.4. What is the half-angle of the conical shock wave formex7d+4vib7-two un 26s hrkd4lpej9p .)im o,ed?

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 the United Stp 51qp3bhv:g . mzbtb)ates to Europe with a Mach number of 1.05 where the air tempe5t.p :zhp)b qg 3bb1vmrature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

参考答案:    
  • :
    •
    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

    试卷内容到此结束!   © 2024 51fly国际课程 (https://51fly.win)版权所有

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

    GMT+8, 2025-5-8 08:24 , Processed in 0.476568 second(s), 204 queries , Redis On.