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://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://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 falsevpazw tff*,.e *uy /l+ 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 fa x 0r: rm 6sfeh0*+o2vinkdw4ved )w0istest 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 st;h6. lx,qjtmz/ . xqbueel rod?

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
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 s4cn31qbpr+s q /r3bwrio 57u sr)rml5ound? (Assume that all otherqnp574l5uq3b r )br/+scr rwr1iosm 3 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 o* ,l .7)0bwe b l*rkmqud8ublcf a 200 Hz sound through ai,* wecdbl*u)l 07.lumq b8 bkrr 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 wavelength of a 200 Hz sound b,kqomswr.(l : jd8h).wufe:lp7 b7kin al.b(8bsfrk:d,l7o m ewkpu . 7wh): qjir 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 callh ful+z3vly*8ed

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 tha. zfa o0-9 p74kfiuvwrwk.m9in 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 dir;,vs/j 9xa)7rg rm;fpz)l jarections. If you move to a point twice as far away from tz9;af l7 )jmgrxr v r;ja,/sp)he source, the frequency 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 ib;7rov 15( ,iuczirn 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 at a distance d from the +d61 defs;nni source is I. What is the intensity at a distance 2d from the source? in6 sednd+;1f

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 sourppv q67nom(hr7v6 5fn ce that is radiating equally in all direcpn7r57vmh(6q v6fpn o tions. What 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 distance from a sound source that g)37nyl.i : akxp ypufpl9 d3:aj3 y(tis radiating equally in all directions. What happens to the intensity level of the sound? It dropsngi:tp(3l 7l9 j3upx y3kd:yyaf)a p. 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 l44ik19;apc1 yxnd z coi)vm9fouder?

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 emitting a3qn0iy +pgkwxq cod8;u;/h j.p h73d p pure tone. What characteristic of the sound increase .qgpo;ju7p qdhd3 8k;/ch+ pxi30nyw 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
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" of a musical notiq 4zrfl)3q ,ee?

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:tn)gx x(0q(ktrsek 9 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 int do(cg) ayh6x;o 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 displacemenv1ae2((qnkc q+raef(q 2 so5fevdr: -t 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 and the sound wave generg)gf(nvbuv; 7vc 10m/kes ct ;ated by the guitar as a result ov/;0m)gvt(7c;becs 1uv ngfkf this vibration. What do these 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 istwem6 t;9 7o(dgqy.mdh-ari4 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 pip x scarj4fid9ystbhp/ln6m 0 o4use)m), a /)8e of length L. What are the wavelengths of the three lowest tones produced by this pipe?l 0p 44)mhi s8n/jya xeub)ta6fm,c so)s/ 9rd

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
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 Hz. Wh)9yd 1pltsyk;e/-d ip0cnsn 65ae; jzich one of the following frequencies will not resonate in nsnp)j/6a ;l ed5pyzte1d ;90 icy-skthe 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 resonating at its fundamental fre:.g/zem *t 6fq 2qxadl,t+rpfquency. Which statement is co2,fe.+q qf*ta: pdmx6rl/ gztrrect?

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 i,m.; -yxka+ su qxbhk6s open at one end and closed at the other, 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 g8 c)nm qz5tmd9yd x35(* wtorof length L. What are the wavelengths of the three lowest tones produced by this pipeg*d9 ctxr55dtm8ywzqnm)o 3 (?

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 isdku3ei /yu,u( 200 Hz. Which of the following du,(3 y ueu/ikfrequencies 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 at one end is resonating at its fundamental frequency cst/ mokm1bm* bo 2z4;r kvklu2i6,v2. Which statement is correcm /ot kozlmbs1;viv4rucb2,6 2k2m* kt?

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 by the same source.oa;oio3uj:xz9kn3 l, j6b 0vxe fa,j. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The perj xa jjbi,3 zk0xeuv o:n3oa6l.fo,;9son 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 : b 90j9xfmvwrb5.po i* g,ypvfnu+b0sound 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 together and a particular beat frequency is j2jl2, dni tn8heard. What happens to the beat frequency if the frequency28tl,2jj nid n 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 exu w42eh4 6nwvrplains

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 observer. The frequency heard by the obhhsdykg ./ )o)sx(bx mse5/ i.serve.xihm/seo s)/gdh y.sk( xb)5r 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 departs f vz+di*g4q(v krom a stationary observer. The frequency heard by the observer isdg*vz ik vq4(+

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 a :g+bk 9 1w+vp+iks:4 dzqxtvnfactor o+b 4i z t:: vnpk1v9q+wd+ksgxf:

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
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 kHzu1, 0uzw. aa .r-b/mr0y+ioq evyc/ze in air is 352 m/s. What is the airyr.0ea, i1cr zyub/0vaqw+ze / .om-u temperature?

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 sounds9u 3bdi3 ftwx s1wo+/y93d us 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 i:qnh9(); dv qqbm knw-s 340 m/s, a bat emits a shriek whose echo rq)9h;qmkwbv d(n-: n qeaches it 0.0250 s later. How far away was the object that reflected back the 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
39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You shout at a cliff, and he0kfguqa. t7b*dw-uv .ar the echo 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 off148 +kyvfo mfnl. ii+ lightning, the distance to the lightning strike is i fmf1viony f.4k++8l 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 cl;td flsr jo4i2ihlad6 2r ;;j2iff on a day the temperature 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 well and hear the splash 2.5 s lanw 1s 97v/gruwter. How deep is the well? (Ignore air resist/vgru7 s1nww9ance, and assume 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 air of a sound wave of frequency 500 Hz i+dw6 nj:9d xrbs

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- .nfgwie2rap/in) r7 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.

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 with intensit +qzrcapg /h-vyr0a gcz64 t-*y $10^{-3} \; W/m^{2}$?

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 of a 70-jr2- syb pqd7,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 intenen7 scf u vln:4e2u7;wsities of two sounds with intensity levels of 70 dB and v7wn; u4efs:l7nue c 240 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 a garagz9f3f0f g8a sse is 100 dB. What is the intensity level generated by on8ffs 0 9zasf3ge 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 source that is radiating equally in xm14on;s7 8fzj7bigp0j; y*.rhk gmball directionzso.i yb 4f bjhr7jg87; m*gpn01xm;k s 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 distk,9 cs3wq rck oeir8+.qlv )2iance of 6.0 m from a source that is radiating equally in alllqk, e k3c9swcr+8 ro2.q iiv) 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 pd; ynm946 /n,pfrkc3 ,e oc ujtxv*5xhower, which is assumed to be uniformly distributed in all direchd/c4,3p6fx; ,vnxyt on9ru 5k*m jcetions. What is the intensity level 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 distance 5.00 m from a ban k65y8b)8dky2t kl -g bd1 hbtsd4bg,rking dog. What would be the intekkbtgbs1y8 56 h 2ln)d84y-b g ddbk,tnsity 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 dB. What()vj qgt15rx i is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in jxqv(g)5i 1rt 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 a point source is 95 dB. At what distang o a-w-c(hx2sz6ujqs w :r8n-ce will it be 75 dcx: 6anjr2 wuo-q8wsgh (-zs-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 12kz;4:wjme) s;b gte3h00 Hz. What is the frequenb mk;wes3 z:4hg;e)j tcy of 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 Hzv w(w5fq4 :mak. What is the length fv5qwmka :w4( 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 400 Hz. What is thgf(m3u5ro d 96m e75ieg0jbdde frequency of the lowest tone that will resonated53m6u i5 b (om0d7d9gfgjere 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/mps0 88gnsii m. If the velocity of sound in air is 340 m/s, what is the frequency of the second 8 pgsnmi/8i0sharmonic?

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
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 wyp/ .9yw m:j u/oahc1yk4c, hlhere 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 ak- /jzvwon f8* pipe closed at one end is 330 Hz. What is the frejvn* kf8zw/o-quency of the third 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 th r)k jug xfizia56qil3lf7,;7x3a wh3e shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocit7 5 u)lfkfq3ix;ia3arlgwiz6j3 h,x7 y 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 roha erexzix5u q6u-/1 +om where 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 io(1wd5 ygtqa ,g5cna.s 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 length 0.75 m is played when the rs-3l 1 vfw+jwktz.xt9j v5dfp:2e ,g) umd:g speed of sound in air is 340 z j9+jkx w.d3 f::1,wg -p5udt vrlvs f)g2emtm/s. What is the fundamental 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 aw. e)5gd 3bhblau5vd7nd the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the ah7 uwgbdb55 dev).3l 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 -bcm 0pm wwt0q.(f4scair where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in bwtcqc psm 4 fw0-m0(.front of the 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 tlo0x+z01 qy x0mg )hqby 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 littlo yqhg 0t+m01x)z0 qxle 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:    
标记此题
69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies2 s(z5bo(zj xn ;uek*m of 440 Hz and 444 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 tg4o zbc+x4kw7h cy7u,xkx 8 xba21zttws (4x9uning fork to tune the frequency of a musical instrumekxgxtcu( c7bky7 49+sz,41 8xaht wxb oxw24z nt. 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 6 mku1 uft*+bg xt 3aj.p9 and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity ofk3bx +a 9put fj*1.gtu 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
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 orchestral:v50s *cdmltxq, g)s are found to produce a beat frequency m qc x5t,)ldsl0*gv :sof 2 Hz when a frequency of 660 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 ,zwk b-+gq 5fe1000-Hz sound source at twice the speed of sound. efg wb-+zk5q, The observer 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 (normvw3 6ywuf(o5 9snkh9pal frequency of 1000 Hz) approaches a stationary observer at one-h wyvo(69 npuh5s93 wfkalf the speed 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 moves with a speeqh k,+zjfw n xz,,6jy)ybjl-8 d of 30 m/s away from the source, wj yb8xkqjzz, w,h ,6njf )y-+lhat is the frequency heard by the observer? (The sound speed is 340 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 800-Hz b . 4 /;6yiv2vp4h fuvz8cclerm3)gxj 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 pasb2/ l6x4;iv 4cfmzj).3ygv e p8rucv hses an observer who is standing along the roadside. What change 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 heard by a stationary observerrmv68b;w5)e zmxk(ea ln; x 3d when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 ) w5v;l;me3bz(endaxm68rk xHz 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 176rpe8d rfgsop1 xva4(yp zi0,ue )v you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you heax8 prpae16s4 ev1zgyofv(i0, d p ur)7r?

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 ao,/xg/c0ck e75tdg b x stationary train. The train blows its 400-Hz whistl/gckx 50gc,eod/tb7 xe. Take the speed 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 atzg c;fn;+pfr4 6t fb1q 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frebq4+f nfcrz1p gt;6f ;quency 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 mx*ycm9kq6/88k cmh aaway from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. c8y x9mmk/q ach8m 6*kWhat 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 1keh8els 31hremy66e 340 m/s. What is the frequency heard by an observer if the observer is moving e36yre1semh 8e1 6hklaway 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 speedr y r3-0ik-zrma3hd+x 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 3m0k3+ d-zhi3-rarx y r0.0 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
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 j 0:m2q.c-kov hbclx; 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fv:. xc ;0 obqlk-mhc2jast is the object moving?

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
85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conical9th;do/n j+ bo ag4j.4 q8-7nyjgvmsj 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 isy 5/ kjokult60 the half-angle of the conical shock wayo06jk/l 5 uktve formed?

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
87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies frl.m)hs9 evt de8g 4n)rom the United States to Europe with a Mach number of 1.05 where the air teme) 9ne. sth8lvr)g 4dmperature 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://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, 2026-5-6 19:19 , Processed in 2.238827 second(s), 203 queries , Redis On.