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 followingaumhs+3totp:s ;+ dblmv+ 8n6 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 fastest thro r,n,n7eu: dwgugh

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 i n,imzh8p 04bnn 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 wyl; ln:ruo0iv)5bf :+q t n)jincreases, what happens to the velocity of sound? (Assnvi :l0+fj) n)y5lqbrwt ;:uo ume that all other factors 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 velo.kgg 9jyitkw*z y7yl ,liv7 -5city of a 400 Hz sound, the velocity of a 200 Hz sound through air iki.ylv7,*-iyg9w z 7 j5gylkts

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 wavelwic k xz/g49d.ength of a 200 Hz sound igk d4wi/c z.9xn air 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 20,07-qc l.sfl ;tj00 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
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 areq;tvw4uemhtl ,b2n09 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 all direcg,n(vbny*bzzg( i;r dmb un .. +2gwf8tions. If you move to a point twice as f8*.bw(, gi yu.n;zzb+rv (nf bggn2mdar 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 diverging waves, intensity is pz 1t4sp4qnvckl7ex 5r e*k/v8roportional 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 distanh3)pdsi v hy:h1+qabg 8gj5w4 ce d from the source is I. What is the intensity at a distance 2d from h4v+djb:g w3i)5g1ysh aq8h pthe 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 sourcefemloe jw-8; kqp1u;. that is radiating equally in all directions. What happens to the intensity of tp - kf1;wo8qu jel;.mehe sound? It reduces 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
13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from * s(n.y8lsyb sa sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It drops*.yl8 ynsbss( 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 incre n.bcp+q3r b5yea9y (aases as 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 sperjd0a3k) xd m8rrdp 5.aker emitting a pure tone. What characteristic of the sound increasesrkdd. )ar3dr5 j08xpm ?

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 spk9 ll)3ey:2r o mke8egn+lqn, :v*n 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/g 7wn,5bt6f6/ll oo bjq6s,9nv nhwd" of a musical note?

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
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from air into waterhh(r dkbp-1*jr5k3 ; wawjm+ a

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
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wxft6hgc38wttx f65 vv - 3pk 9ecax7s6aves 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 wav-rl+8 5sywsox e on a guitar string and the sound wave generated by the guitar as a result of this vibl + -w5ysors8xration. 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 is open at both ends, tfx 95)2qtwi7 nis:(ufjoi ( 0xqa1dr lhere

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 Lsgd8 ec7ivifk.j -2z,. What are the wavelengths of the three lowest tones produced bs7ik2d. ei , jzf8cvg-y 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 ofwhzj0* 7r0b i3mh cn*pen pipe of length L is 200 Hz. Which one of the foll03wh ncf i07m* zj*hbrowing 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 length L is resonating at its fundamenta/ iexn34 uuu-ce q 1lxt:*dft-l frequency. Which statement is cor xueetu1q3ucn4- f/li- t d:*xrect?

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 clos :y dw:lh.kqh8ed 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 of length L. What are the wasp k(ecf/ o via(w)5k-velengths of the three lowest tones produced by this kv-)aei fpw ((/c5ksopipe?

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 2y7(v880u 7dejafhpvem g th/in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resgmy8aev707dve (hjuft 2 h8/ponate 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 resonatingjm:8km9 t4knm at its fundamental frequency. Which statement is cmkj9n m:4tmk 8orrect?

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. Eaul epm +g+sx 3tb5)*jzch speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. Tu5m+jl*p+xz s3 t)bg ehe 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:    
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
30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beatg 4audv2 )ug*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 so3, a4e jm .srjt /u61fedfxt3ounded together and a particular beat frequency is heard. Whatted6jj f3x.1sme u3fr/ao4t , happens to the beat frequency 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 explain d.1m6ab gsbrlp*c(rg kn w-;.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
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(-fw( fo;aq 9+teiwsi-8yuzb the obssw(i-aq8i(f ;w+e zt fuboy9-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 m nqf:e2u3dnkrfkko336-r d 0observer. The frequency heard by the observer3o d0 3r k:3u-2derfmk6 nkqfn 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 toaqksg ,nx 32y) double its MACH-speed, its half-angle will decrease by a factor of:2ngxaqky),s 3

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 45f- 2mbb 9ncl, idvr6g* kHz in air is 352 m/s. What is the air te2b ivg 6d 9bl*fc-,nmrmperature?

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 :7nuyx) yy,c;v /msgtthe 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/b+ dfzsf0;q7ts, a bat emits a shriek whose echo r0b;tfz+q7s d feaches it 0.0250 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, and hear the echo irca67n3 s wk*sn 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,t60m3qzv equ 1(f ,hgt3jd/we the distance to the lightq m0ev f t uq1j(t6/e,3hgz3dwning 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 )a3/jj c7i0g(cc ;hbvfc. zcms from a cliff 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 hdk +pkkl -ptk,0c0o )year the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound ip-o,0k0pk) +tdlkkyc s 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 t ,4fv*cd+;j m yaavc7frequency 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 at/ur;t vmn+fnq .+ w7ld $23 \; ^{\circ}C$ 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 o:sgqow+d--g7kp.le f ez - t6nf 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 ofmo d4w-p0zl f.m.3 m*x1e dsgv 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 intens.btkk7 t84 mg3qu*mw hity levels of 70 dB and 40 dB?k b3twqh mm7u8.kg 4*t

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 thq f:i/j0ey0u1r hc5(e zbpo-se intensity level generated by one enginejc s-f h/0pb1( erqiozey0:5 u?

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 distan)ydys5x1ykw/ m u +lko*l)rn/ce of 6.0 m from a source that is radiating equally in all dir)kyluo1mx* wry/ /lns5yd+k)ections 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 odv3 f mbdsck* q8:( vci:*dgv8 hd;p.cf 6.0 m from a source that is radiating equally in allci .c:v :kh*m3dv8b;d*dc v (dgqs8 pf 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 assumylviu . s- :;pbt*fu3zed to be uniformly distributed in all directions. What is thv3s tuyzup- ;fl .b*i:e 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 uv2;*.saic44xz fqlf q moas9 :xjo+;is 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical *mc+x;uqfs.ilzfvaaxj2s4:o ;94 qo 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 intensq-)h:tyfbr- l ity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the souyrtb-fh-ql) : rce? 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 a point source is 959*fqv 2xckmw:fh+ a1c dB. At what distance wvccxf2fa+ *qm h 19:kwill it 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 ha)c8pu;+dcd x18lh+ck3lxbx o s a frequency of 1200 Hz. What is the frequency of the fourth harmonic; oxpchbu8k +8dc3 lxxl )+cd1?

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.:;0reu hxomaept zu+ i4q 4 qrn25g3m of an open pipe is 900 Hz. What is the leng x tq r r5;03ou4 zg:i.+2pqnamh4eeumth of the 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
58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate inw / (kju)p dk ayl9v1-zfag g+yo5a70c an open pipe of length L is 400 Hz. What is the voz1 guk)a (-kg fyc+a0p/95yaw7j l dfrequency 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 vh9z z7ea )xqus(:s2yvd0i:o v elocity of sound in air is 340 m/s, whaa7 i)(zod:sz v y0 eshq9uv2:xt 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 the t( yk0uq*9r8nc ai 3v d1o6u5ruriajs nu7v( /pemperature 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 xf7fydpy+a/ 0)x3ns tx0lh-u one end is 330 Hz. What is the frequency of the third har+sp t x7/y30 0u)fyxfnx- hladmonic?

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 closed on one end that will h: z60,mvduecyave a fundamental frequency of 60 Hz on a day when tyz u 0:c,6vedmhe 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 r3: svvstxb6u(bs c)xy+//mssoom 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 imjqt( krw7 ;c /k7qmr6n 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 0.7ap5u6ffgz(v)n-c; 2g nmov(s 5 m is played when the speed of sound in air is 340a(sonu- mgf5gz;)p 2cn(f v6v m/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 dwbnv2 z7 -w+xopen and the other is closed on one end. If the fundament7 +xdz wnw2vb-al frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed 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
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each emit a fre,yxf 3xsoyt3r f 8cqjw*- ;:omquency 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 wouldj-,3:fxs;w 3m y o 8rqxyc*oft 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 drxja,1:n5j: x*iyl-zhapz t b6iven 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,:a :ny j*-pztz,i5jabxl1 xh 6 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. What is the beatob)b;(1)jeqg n1cp7 q sbw0+k s4kijn 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 musical instfk :lkm0 mbt9ju1.d r-rument. If the tuner hears a tm90kmk1- jbf.r dl u: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 alo1(t7ndi pb9re 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when t iblt(od971pnhe 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 ovu)o6 1y uyxj (-n7jlyn 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 one of the strings would brin6(-v1 nu ou7xyy jljy)g 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 speecjgm61me :m8 ld of sound. ej l8mm1mcg:6 The observer hears a frequency of

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
74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequenlxnf1 c *o z1z:nr5;/ nyy,woncy of 1000 Hz) approaches a stationary observer at one-half the speed of sound nzn1: o; lyrw,1co5nynzx/* f. 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 liste/3c: vesw qoj5ner moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed qv/e5 :wj3scois 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 travelio rw+c7 q4nzh/8x/l rfng 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/ nhz48orcr/7 lwqf+ x 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 hearnlrnpi(v/.ob7 a* 5r5r0txea mj: 9u nesm* q+d by a stationary observer when a train approaches with a speed of 30 m/s. The 5m e0a o nlur57t*:jnr*(vmn/ise +r9pxbq.afrequency 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 atis1fq0twt7 c 7 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequewtcs tqfi1 077ncy 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 stationary train. dj6:l3zary0ckr+ e cx* 4t0ibThe train blows its 400-Hz whe 6li 0k+4*bzxcyrjt0rd3 :a cistle. Take the speed of 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
80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you aq7j 6o; sxzv )dp.1xwft 120 km/h. The train blows its 400-Hz whistle.7 p);wd6svj .zoxqxf1 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 k f8n xw7*:u og0 yilu4j.ly9dxm/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of thy9yu*xld.8o n07 flji x:ug4we whistle?

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
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 soundcd/.ubf en1f 33pm a8*jp:lhc in air is 340 m/s. What is the freque./lh c*bejfcau 8 dpnp133mf: ncy 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:    
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
83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train hor;ob a0+w2z/ b/l *efewat1aoan is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard wtba/*za/;+0 e 2ablfoow1 aeby 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 spe;z)1zbj t.-c alhc7tmuq84d aed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assumct)tz.u l-d87;azba4c j 1 hmqe 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 +v)e4ow)mo/ dnu*pe a conical 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 of the conkduagfr38ct0s -g 2 (pical shock 30g8pf u d2(tsgkca-rwave 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 w,m5hmhnwd )huzs nq*bb e;g;-(+vn/ sith a Mach number of 1.05 where the air temperature is +nbm ;nu h n;ewgdb-,z vq5*()ssm/hh$5.0 \; ^{\circ}C$. What is the speed of the plane?

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
  • 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 08:39 , Processed in 1.484870 second(s), 203 queries , Redis On.