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://autoconfig.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://autoconfig.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 following is a f 5j3dilh( fghtr;w4g5hs0vs/ alse statement?

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
2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is conkdlnnt4b(-. lj jeo0n (+ hxl:ducted 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 steel rod?jhca ic: 6g0cy:1u,lu

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 happens to the ve,-w2 m* 3eyvt gz2wbl9dsfku,locity of sound? (Assume that all other factors remain constgy9*- s2w,veuwt ,zm2bf l k3dant.)

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 Hz 3a et2e3gd1gn u p+f3t:wzvi ,sound throug3d2t gw3v3 zupg fe ai,+ten1:h air is

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
6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelengtb3/-n3wxc(y-fi yzswwl w ipq:(9b /ih of a 400 Hz sound, the wavelength of a 200 Hz sound in f(- l3b3y 9nx(w:qw -zsc/wwy /pbiiiair is

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 Hz are callqc7 (pojo (r grw*bsurx74+f3ed

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 frequekp h/-i4wl fu lgu(:x5ncy less than 20 Hz are called

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 uniformly in all directi.2*at4 (du0dahoxqug+ s+iq +q j6kt rons. If you move to a point twice as far away from the source, the frequency of the so oqtsdra+ 6*d+a(kqxhq+gt0i 2uuj.4und 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 divergif b m9km s*)xqfp-7ibezxz -44ng waves, intensity is proportional to

参考答案:    
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 a 82vct:m ns-ijl mr8--de4yxu-)zx tot a distance d from the source is I. What is the intensity at a distance 2d from x moltij8-zu2 sxm4dnv--e)-t8ry :cthe 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 sourcepz v1/ m*mmsmqdje xldp4jjd u37 +7:( that is radiating equally in all directions. What h /7mdzlm * d dm4xmve+sj(pq u73j1:jpappens 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 distyt(df hhx7;869t x8nf:az71 rnv frz pance from a sound source that is radiating equally in all directions. What happens to the intens hvfnx nt 8r7x91dtyhfzrfa8 z6(p7; :ity level of the sound? It drops by

参考答案:    
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 sound becomes lozpyasi b(c2/)h5i j)asw:u.i uder?

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
15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speaker emi j,mac5gy;jqu q(s /;dtting a pure tone. What characteristic of the sound incr a;j;c,djqqm/ (syg5ueases?

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" of a musical g wxflr 8 6*/a9cs7wfznote?

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" of a mussl 1;k/l wat7u2,itw (,pu: o std:zpdical 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 m(2ougmu ti23 jse5fpq5 *yrur-d. 0hp+jrq :air into 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 e e//fm*j1x dwwaves 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 and the sound wave w;*yo6fm4sgk4ab p)w -qdtl s,ygk )7generated by the guitar as a result of this vibration. What do thes-y ) )fy4ao;qd*bpslkg6 t7 k w4s,mwge 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 which ishd8/s-n 3h; mrx;czkq 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 the wavelengthsbt:6qo zud nsytc2y0 5qrc hy,9en: -- of the three lowest tones producebqnyetcy h2:5zn60u s-or d ytc:,-9q d by this 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 is 200 e,(j1o/fmf,ob 4b*nptva(wzsv 0 v j0Hz. Which one of the followinnat/0w, m(oz o4bebvsv(,* 0pjvfj 1fg frequencies will 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 lengthy,he- 5bi7papqoc 0g( L is resonating at its fundamental frequency. Which stateq(ph 7o0-ba 5 icpegy,ment is correct?

参考答案:    
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 other, therewyyn **.kcifpl6532g fkfcnvi 9e -k3

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 waveleyv*z/ sp qvgsa8nk4a6ya .i/8ngths of the three lowest tones produced by this pi .qspani 8*ay g4av /yv6sz8/kpe?

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 icg h5bgp3;ne u6.m*pts 200 Hz. Which of the following frequencies willm 3cut b5*hpn;eg p.6g 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 at one end is resonag9cu;wd* yxu:ge4xm / f bu6q/ting at its fundamental frequency. Which statement iyqexm u6 gx 9b*u/:cwu4/d ;fgs 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 between two speakers driven byw mu1s 7n)n9tg the same source. Each speaker producetsn1wn9)gu m7 s a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

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, thet,aevy2 67 av25 pl2/rquoz ur two sound waves should have

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
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 :2 3lxg +o m 8:rrin4noihlqm1is heard. What happeg mr8nliol1m+h:3 4r2xin: oqns to the beat frequency if the frequency of one of the tones is increased?

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 expla)v ccxncz94 ;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 approachesjf b3swx+vsiqr4*hh tut//9 : a stationary observer. The frequency heard by the obser i9qtsv h*h :wf3tu4x j/b/+srver is

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
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a statiu*mdjy4detk)t/ k.lzl g /*s.onary observer. The frequency heard by the obmgzult4/td*lj k e)/d *s.ky.server is

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
35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a jet plane were to double its MACH-speed, its half-angle will decrease by aesws 2+tm t0+u factoswesmtt+ 0u+ 2r 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 fb2wdwcd :plu19 2v pv*requency 45 kHz in air is 352 m/s. What is the air bv1c92pd wuw2 *l:vp dtemperature?

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 8 8,+k8g5 lfguiiw h)sam:xva the speed of sound in 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, aokft(malm 11- bat emits a shriek whose echo reaches it 0.0250 s later. How far away w1ml ok(f1tm-aas the object 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 echo in 4.00 s. The temperatulsikehb3i69mx v c:2*4ez ni8re 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 5.0a9sk 7swgt9 (h s after seeing a flash of lightning, the distance to the lig hs(79s 9kwgathtning strike is about

参考答案:    
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 tempe zjdavb/a08 00iqo)a vrature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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
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 wejw o6l 4b(nqt+ll and hear the splash 2.5 s later. How deep is the well? (6lj(nbqtw o4+Ignore air resistance, and assume the velocity of sound 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
44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air ei-he2*sdgi.7 a n(ob.rt /tiof 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 woj n 1yjka6fwf;zz1-cb c(72at $23 \; ^{\circ}C$ 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 level of a sound wi2,wgfoq ucf ryi4,j:o 1mev85u1zp8rth 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 or 8jjlhg kl;o0j*t5 7qf 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 r/(+rjye4psmo7 4loj n )w xj.of two sounds with intensity levels of 70 dB and 40 dBnrl)+eo p jwo4s(.jry/mj4x 7 ?

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 10 ris6 d9 j09 +*xtvw7zwlxqk5g0 dB. What is the intensity level generated by onerqj9dlwi0* v 6swx 75z9gx+tk 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 djmspc t*l*v esa4m92 a: -rk1yistance of 6.0 m from a source that is radiating equally in all directions is :s es* lmyct2v*apj41ar mk9-
$6.0 \times 10^{-10} \; W/m^{2}$. 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 distance of 6.0 m 8q;f0 w fcnhe)from a source that is radiating equally in q)fc8 0wehfn ;all directions 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 u in.9p2(qry jk+pp: t8uchl 7iniformly distributed in all directions. What is the intensity level at a diup7c9:j q28t(yihk+ip.r lp nstance 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 distance 5.00 m from a barkinr56kya +e1zc dg dog. What would be the r de5+yz cka16intensity level if two identical dogs very close to each other are barking?

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
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 is 60 dB3z+ cv3(3-r olrvjofb. What is the intensity level (in dB) arvjor (vb3-l czf3 +o3t a point 2.0 m from the source? Assume that the source radiates equally in all directions.

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
55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity level 5.0 m from a point source is 95 dB. mi8qk s/h:w8a At what distance will it be kw 8qm/:i8 ash75 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 ho;rwx*i..vd wta0 ,wq as a frequency of 1200 Hz. What is the frequency xt.w.v0i*owr ,;dw qaof the fourth 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 harmonic of an open pipe is 900 Hz. What is the le)-dyo1i h uzwfg6kumxr ;b7;7ngth of the pho;iwu-x;kg zb 61yr7dm uf)7ipe?

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:trjwz5-9a)gc72qy v2u n qmz pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an ope9vzwu a7gn2j q zc25:m ty-)qrn 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 velocity of sou:gacxyipu 4f;mf(h (4 nd in air is 340 m/s, what is the frequency of the second hari4ayp gf;h:fx(4 ( mcumonic?

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 temperatgo75ow(v i 9gut/ x:pgure is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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
61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequency in a pipe closed at one end is 330 Hz. What is thabwndd*qahc k)i,(*3u+efg 7: 5nskfe frequency of the thiquf(nkkf d,ewin* *ab5g3) 7+scad h:rd 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 pihzh1g y8bb 5 szr+/ijwux f+/4pe closed on one end that will have a fundamental frejzyxgs 5wz+r/bfhbi1/ uh84+quency of 60 Hz on a day when the velocity of sound is 340 m/s?

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 whe k rn t/o;4:6epsis6lhlwhm 56re 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 iss6zjsq jv (l8t,zd9j ovc-s 9* in a room where the temperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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 len(vz*7dh t5uazn 5dvpz mm6:.tgth 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamen (d76av55*vhpm un : mztdtzz.tal 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 f6 3h+0adzpwabr9 -e gsame length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what +e3f0hgzw6p d-9ba a ris 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 ef7urq1 rjo:s o/1twp2mit a frequency of 800 Hz in air where the velocity 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 soun:sp7jrqutwf11 r/ 2ood?

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 drivt: ge t /)- q7hsawp) sbk*sdjlhm*b;y3ai90ben by the same frequency of 500 Hz. If the distance from a person tb 0sd:** -e7;/ t 9)stq)jbihhykbglawma 3pso 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 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 bvd jjqcq1wp9542cf w0ss:vc s.::fgk2c*a t444 Hz. What is the beat frequency?

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 fork to tune the frequency of a musicalg 1leek2 k8/fl instrument. If the tuner hears a beat frequeekg8 ll 1e2/fkncy 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 o8bn/ 2anu+y*c7rjg6 6our6wc*ya of horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity ofr+ o o6 cw6a**y cn2gjonau7uyr6b/8f 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 strings on two violins in an orzcqc. c n9l,g5chestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the stringczcn9 q g,l5.cs 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 twice the speed of sdp . xjf8:k;chound. The observer chxk fjp8.d:;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 fr7 jw jr8jc3stv/v(fj /equency of 1000 Hz) approaches a stationary observer at one-half the speedsjwt( jjc3r /fj/vv87 of sound. The observer hears 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 m4pc ly o;oq7y41sjxhzp,o g 0)oves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/4hljp g4zooo)xq; ,17pys0y cs.)

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. It is travetuqr nz8uiz) ls ;a: -,74rdflttu 0k5ling 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 change of frequency does the observezlr ut:qkstifdl8 )4; , z7u-ratn5u 0r 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 heard by a stationary observer when a tra auxlgxe3b(re*v 9 0hf;2/ jnek nue0.in approaches with a speed of 30 m/s. The fre eux9nrvanke j3( b0*hfuexe /g;.l2 0quency of the train horn is 600 Hz and the speed of sound 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 you at 120 km/h. 8;vu hm 93/p; akhigpbThe train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. W h v/3kpu iabp;g9hm8;hat frequency do you hear?

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/h toward a stationary train. The train w5 o+8tw61ghfz uax9 wblows its 400-Hz whistle. Take the speewa ozh61wug58+f wxt 9d of sound to be 340 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 at 120 km/h. Thh/gcn5 2 kh ys.b)h+ute train blows its 400-Hz whistle. bunh5. ty)/kshch2g+Take the speed of sound to be 340 m/s. What frequency 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 kuo45b2e4mdbl 6 kq5d whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actualke5 k d42lq4 ub6bo5md 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 50,ka vs.x:+rzf0 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency he.v:f + asz,xkrard 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 aid 0 l /.lt1endq9z3rxnr is 340 medlxtnr .n10lq/d93 z /s. What 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 object. A 40-kHz signal is sen9bee-v dyc:* oxdgo6z0mbp,0t out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object movpd y 6v0,o*dcbo bm9ee-zxg: 0ing?

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 conical shock wave pypxw(9cwd6zrv 2x1 . eroduced 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 Machzqu ; i*zhw64hio6c ngj*uu 4hq2++kh 1.4. What is the half-angle of the conical shock wave*z6hu4nqh c * + ku642ogi+qzihuwhj; formed?

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 o6 2 ,7fd7dd5m jvusjzub.8peStates to Europe with a Mach number of 1.05 where the as7 u 5 z,mf86dd.jpjudovb72eir 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://autoconfig.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, 2026-4-17 08:58 , Processed in 0.516648 second(s), 204 queries , Redis On.