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/ in5*3xf+eaqzy i6 xk 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 condu v8kx)nz ki(*b1ky ej jpg,,9ucted 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 wj-i p7d-.z:4ed 7ospzc z ddr:qjh1+sound in a steel 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 happens to the velocity of sound? 7v 3hcs0miaz 0 (mva szc03i70 hAssume that all 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 sujxd bi;01- ulo:g/v of a 200 Hz sound throughuj vilu:b /-0sog;x1d air 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 0ay+1e,c dlk6cp m/a nsound, the wavelength of a 200 Hz sound in ai+/, 1cdmp neka06la ycr 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 cal 6q 4qpw*u*8pljlbl)mled

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 (4 +gz)su7kr h,a cl1.yzfyrpvmuy/6called

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;f pgn .(j-exw-o fnu* in all directions. If you move to a point twicof wuf. pn g(n;ex*-j-e as far away from the 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 diverzr,tw 0.f rfa3le8vw2ging 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 source is I. Wh.*ax/zd)dybe9x x 2 ugat is the intensit g.xuxxay/ddz)e92b *y at a distance 2d from the 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 source that is radiating equally inxr l1fg )8-b1ntdpe8e all directions. What happens to the intensity pe1bxl)g8-ftdr8 ne1of 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 is rn9di b czm(,b+adiating equally in all directions. What happens to the intensity level of the soun in+ cbb9m,zd(d? 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 fzc 85s *f:kkbsound 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 characteristi.an0q/tj wr( dc of the souan.j(t w0qd/r nd 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" of a muxk5f4 mtybp7mb.a8 v )sical 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 "pitceq fft))mm/5t lx8vvj+yw )rvh*j+ l9h" 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 into water9pb5: m xqhvj.

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 displacemm6q*rwil4e 0jyg /l o(ent waves are

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
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 generatednw9h6f qb5jq: by the guitar as a result of this vibration. What do these two waves fqb96 :5jhwq nhave 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 at both e)/ndo9gp: xd lnds, 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 are the wavelengths of the three ,.l p yl0f2c4/tjd c;dtpbb.gydv94 elowest tones produced by /jl,ydcf 90y2v e dc 4blgt4tp;d p..bthis 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 Hz oz(nrkc1fcuqw c erv,z.k/j8-(n o25. Which one of the following frequencies will not resonate in the szqe. jrn cz 5vo1kc- o/(8rwu (n2f,ckame 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 frequbpk;mkqho7pgn h.3 day52 4lvu*l-n2ency. Which statement 3kh4b 5u l *ln2mnk;v.g7adoqyhp 2p -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
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 at1 n7 4ipt0o /; ik,t)kolkzacm 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 of length L. What are the wavelengths of 7 l9icg3tfmh2utr,/awck w,vm/mq /. the three lowest tu/ltr3wv/2h, qk tf7gm .9, wc acmi/mones produced 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 Hz7zvgifuv;pf, ,9 v nkruc m/2:. Which of the following frequencies wp ignvu v2cm,r9;f7 vufz, :/kill 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 fun,m;adt( daow43 rggg9damental frequency. 4 gd;9(m,wd3ggata r oWhich 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 between two speakers driven by the samevvuhf6+m n9ko0roj f-z1g 14 v*vz(zz source. Each speaker produces a tone with a frequency of 200 Hz 9gonvz vov 1-(fh*vzur0+zmk1j4fz6 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 t .xmf v6d(2hylb9y gf)wo 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 pawb e,g5lm2jdecr*12 articular beat frequency is heard. What happens to the beat frequencya w*r,e5g2mbej1d2c l if the frequency of one of the tones is increased?

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
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift expl.sy o;-(euy kkains

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 tya )zh7b o92gyjngkv p5e:c;qjvxyh+ w 4y.,6he obs )k: 2v.5gyxyohpbweg ,j 9yj74q +yv6nca;zh 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 departs from a stationary observer. The f*xx)8bre13z 5qaq :jw wp/, qilyy9korequency heard by the obj1ap/8*:eqq 5qly)i wr kzob3xy9xw, server 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-speed, itsgu .+g( mqf,mc/ 1eje7wg 9n l,zn8ash half-angle will decrease by a g 7m/cms u 1n+g.l,zg j9af (8nqhee,wfactor 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 gyb4ghj5p,b3 is 352 m/s. What is the air54hj b,3 gbgpy 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 ofex*v ouf t725z sound in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

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
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 emitsga54y;d5hq ce*n2:h dix.l gj a shriek whose echo reaches it 0.0250 i:ndh25dl .xh*g 5ac 4;yqgje s later. How far away was 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, a0c3 42xaqzfssn;s8tddbzl kz0l(: x .nd hear 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 of lightning, the distan14wlwlm1un )j ce to the lightning strike is abo4ju nwm)l11wlut

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 o 7ybid6lnxsicfa *4:dgq9 +f 9 cf87xen 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 lat/ds4 q(8ekt4k.nh9fjm+a hie ma )6k fer. How deep is the well? (Ignore air rt )m.h4 dsej / k9amh( 48a+nifkekf6qesistance, 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 r7:re 2uegkgqb85g;uof 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 ak r*fttd+ai93 :ne1foir 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:    
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 intensimv gmka34k1s1ty $10^{-3} \; W/m^{2}$?

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 2jmhy,cvw 3 o/ddaf5 )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 of two sounds with intensity j6bzn4-s /nzglevels of 70 dB a4bg6 / zjzn-snnd 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 eb.mb2gro ) e:,dgst:sngines in a garage is 100 dB. What is the intensity level generated by one engbgm. ):r s2:t,sdbego ine?

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 souu u8-7nj(;gc9kw dxdprce that is radiating equally in all j pwuxu89dc nk;7d g(-directions 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 distance of 6.0 m from a source th kyo19z 6kyv/su xc;n v-sjin2;6q6uxat is radiating equally in all directionky6 1ic;o- sq9jvzyu6 v/nu xn6 ;xk2ss 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 assumynx9m/sbebh)g, c u,( x./juped to be uniformly distributed in all directions. 9 hygc,emxuuns)j(/b,b x /.pWhat 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 barking dog. What wodt dr n8vp7tz1mkogsg 3,: /sc;0n7xk uld be the intensity level if two ;kxz,kdv 0ct7s gmd3ogs/ tnpr8:1n 7identical dogs very 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 level is 60 dB. What iw-tg8j s i13:ycz*y tccga7 ffs3+9azs the inteyc z 3s:g8* i7az-ts13j9gy fcwctaf+nsity level (in dB) at 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., vx;zg2dlxz8 At what distance will it be 75 dBzgxz2x l,8 ;vd?

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. What is the,gviep t m-,.u frequency of the f., tmieu ,gp-vourth 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 pioh4ke+ 5ix5adw fgz 05pe is 900 Hz. What is the leng4kd 55zwaiofx5 h +e0gth 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 iavtj57*a8 p 1e qmk9wc mq4xibz.x y+;s 400 Hz. What is the frequency of the lowest t1tj 7k4ap8;z*xmv5a9e +xq c.wi bmqyone 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 0.80zb6:go (b)2d*jfud;k:gol m sn*-foe m. If the velocity of sound in air is:;o* fbnofzjbg-e) dol(6*g d:m2 uks 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 room where trupel 5utxch6k;.9k9*d,k is he 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 a fdja6 y/m--qu 1a,5mjmouzpwp9- v 8yt one end is 330 Hz. What is the frequency of the thijq-p j oam 1z my6y/5fpw vumu-,ad-89rd harmonic?

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
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 one end that will have a fund5y02pztc(ebp.xh9 bcbh .xciz8u3h )amental frequency of 60 Hz on a day whcxb 5 9. 0e).z2u3pc(ib8xhcp bzyhhten 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 i87 axz*lzydp5s in a room 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 is in a room whez2;vpab9 kc9:k kgvz)re 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 o9txcu2)aply s1o b *jf3u;(pwhen the speed of sound in air is 340 m/s. What ip* f 2utlsx1b o;3pcou9j (ya)s 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 and the othhuytyahj s +y*k:;*s5er is closed on one end. If the fuy t5uysyh **hk:;aj+ sndamental frequency of the open pipe is 300 Hz, what is 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 frequ1 ppoitf+kx252+ldx v ency 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 fr2tp1xl +k xf25o vip+dont 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 and driven by the same frequency of 500 dq /qhnj l5 zxc915-phHz. If the distanc- qcnhhqlz9jd5/p5 1xe 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 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. Whati,ovjqkiv/g3g1- h6 o 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-Hqb04wx ))dtc jvwce73z tuning fork to tune the frequency of a musical instrument. If the tuner wv0tx 7)b jq)we3ccd4hears 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 m and 7fu 5-v1urj 0ma m respectively. What beat frequencyua j-f1uv0r m5 is heard when the horns are sounded 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 strings on two violins in an orcheb5gq4z wt7 ss *rpnw;:stra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage chzs 7tsrnbwp w:q 54;g*ange in the tension of one of the strings would bring them to the same frequency?

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
73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a35/:z b0j f,ras rzd v4swvz8f stationary 1000-Hz sound source at twice the speed of sound. r8z/ szsw ba34zr5dv 0,fv:fj 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 (normal frequency ut-wlh vm , lw,1q;z gwa+5ts5(j6ajp) vj-qaof 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hewa1hsjp5a-j qu (g;,am,l-vz+tt vwwq5 l)6j ars 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 flds 3r2/ys i s/g0ev3tv0: joof 30 m/s away from the source, what is the frequency heard by the observer?dj v l03y/g:t0 /sosv2r 3isfe (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 siren. It is traveling at 35 m/s on a day when then/pdm2fc 69+qnsh llv)o)0k o 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 frequencq mhsl)o2k0fd l9)/+pno nv6cy 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 statyhob j0j3oa w5:0lm :0) yzovuionary observer when a train approaches with a speed of 30 m/s. The)o 0owjv a:b0yzum: 03oj5lyh frequency 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. The trainn7 :dflra3k f6 blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What f:d7 k6 farl3fnrequency 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 statip i2 (1ubxyv f1q4 cq-uber52conary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. 1 vy -2cbquer(i1 x5 q2upfcb4 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. The train blows its 400/m yy2 6s;0uo/ vth-k( 1c(bp0k+fywwwmdssd-Hz whistle. Take the speed of sound dm-bc/w0k0 yw fy(vp6st( uw sm21syoh/k+d;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/h8mm+p0 ,,ge tjpwwo its whistle, and you hear a tone of 400 Hz. Take wp 0 emt8,mj/owpgh,+ 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 /- ;9-ldy honqvz6upcin air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed of 30 z l-ov/qy6c9- ;dhpnu.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 airhlq16xsi 4h3v is 340 m/s. What is the frequency heard16hxivs qhl34 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 40gif a,eqxr g7ain:1), h3z3yv-kHz signal is sent out, and z y h1 xr)fgq33viaa,,egn:7ia 42-kHz signal is returned. Assume the speed of sound 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 conical shock wave produced by a supersonic aircraftz+ltg9y: 3yoyf 4bp; i 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 halfy(e e9v cis *hun79ml* n0k*mt-angle of the conical shock wah (*0um *i9k7lnc* e mnvs9tyeve 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 States to Europe with a Mach numbem4dq 4n7txw0t r of 1.05 where the air temperature i4xt4nqtdmw 70 s $5.0 \; ^{\circ}C$. 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 2.218912 second(s), 203 queries , Redis On.