题库网 (tiku.one)

 找回密码
 立即注册

 

      

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
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test70.html
 作者: admin  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 ih/ovu3 fw-+um s 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 througg1.0bjh)tk hwuo,7 wih

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 souctfga ,,oqgl 5z5n+)a nd 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, whauhebz p( 7oq)7zs h-e5obxg58t-ddx5 t happens to the velocity of sound? (Assume that all other factors remaino5hb7)( db7s8g-5 xxp ezz-e5utqoh d constant.)

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of adu ctog1 3)3nu 400 Hz sound, the velocity of a 200 Hz sound through ai3d u1)tc 3oungr 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 wavelex+):.x dw )cjqbrlyb9) -myh+vy:tvfngth of a 200 Hz sound in air i+t:x+hyr y ) -9jy)d .qcvlbx)m:wbvfs

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 frn n4)s iavvkq59 pe*q0equencies greater than 20,000 Hz 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 Hzx8kdf;umuv:y xef .p 20 0de;al:tk8h 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 direct zd 5b9ca*njqxlt;1. cions. If you move to a point twice as far away from the sourcb j59nc qlz.tc*d;a 1xe, 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, intensb(0u g*ymt9sfr flwmf-i4:.)uin ip f );z7kmity 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 so+ xm fd 5jhes+;iod88(e)y ofource is I. What is the intensity at a8d x 5 fomoh+o(i jfe+;e)8dys 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 in all diradtaa u,)2m(; 3kwr trections. Whaa , m)tr u(2;td3awkrat happens to the intensity of the sound? It reduces to

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound :u)wplbjz6yds ;8xw m c k2m wpo(w-+4source that is radiating equally in all directions. What happens to the intem8m-kl 6wxb(:2w)pyzdu w jpc4so;w+nsity 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 loudoty3r iv+w emh2g5c*;er?

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 gwzte esy9:i+(*.j ad1 flnuq3,jh 7ca speaker emitting a pure tone. What characteristic of the sound incrqzntj3:dauf 1eghj +c7 e*9i.ys ,lw(eases?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 musical not-3ork4,x n 2pc q w,se-,-xqcxffl5w pe?

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 "pitx q: j3u ).hd/xl*imod.1 mqarch" 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 aj)op.89 yqw y9lspfon3a :g;3nn +oru qf1 7rfir 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 wavxhtm)h0 d(06ziteu 3 ces 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 wai*ta) :t y 7tqale7d,zve on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two wtzi:aq 7y *etl7,)dataves 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 fslir/ j4 3n1uwhich is open at 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 are the wavelengths of the three l6t +g; vjoshrchs j,1(owest tone ;jvh osh1t+,6sg(rcjs produced 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 Hz. Which5swos+yfg*r-ks g* c: one of the following frequencies wifs*g5*+o gs s- r:ywkcll 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 ar.6rwhkt5av1(uobk( -m.: e) espmhfundamental frequency. Which statement is coo6e.m( sa:) w-m.tr a5k hukhb1erpv( rrect?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 whichxf6 (q 34vszip is 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 of length L. What , gv wulx(v*y za9kd3 /;y3fgbqgl -a(are the wavelengths of the three lowesy9db ag;3x zv/y-lvkw*( gluqf(3a,gt tones 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 tz 9rgg(q2d.nof length L is 200 Hz. Which of the following frequencies will not resonate in z(9tgn2g. dqrthat 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 resonaduyf 1rjfffr * . vltxi4+paet;tz-)0;7 4wqzting at its fundamental frequency. Which statement is pi - faz; *vtdez)wujqr4l f0t7.4f+rfyx ;1 tcorrect?

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 dm5 kv+l j,tzm 7riyt3 9-*ofvsource. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed om3*t vrk vm,7dyil-f95 tj +ozf 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:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats, the two sound waves shoul z+g)qj-gz;4 zvs6s9rosgyi: d have

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded toget rzrd+i 8a:sr9her and a particular beat frequency is heard. What hasz8:r+r9 a drippens to the beat frequency if the frequency of one of the tones is increased?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 explainsz gas qj- fyu. m;k7dcnc,n.(:

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 oi5+x y+2 ec 6)h) bog;i(6t itqplrm6s3sxxllbserver. The frequency heard by the obspoglit q3hxc2xxt ls5 ;yb6r6(6)+em lisi)+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 fre- 7eb0)jap66gna6j6zdfjfz gg dc37 gquency heard by the obser6njp j63 d7g)gagj-0fgc6f b e6dz7azver 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 MAi v wzr38i(qy(8whz j sf 0o30b89lsdwCH-speed, its half-angle will decrease by a factor slwfzbro88h0 jqsiiy9zwv(w 3d 0(38 of:

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
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 ai-03jaw,sww clef5 sz;s yc6cr g 3di92r is 352 m/s. What is the aissr 5cd92-z; y 033cw fia,wg 6clswejr 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 h jp)2u po2t(*n(lv4uks, b/k.g+4kijjy obtof 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, a bat emits a shp8btjqr9 ldji*o: 1k:9ab )wtriek whose echo reaches it 0.0250 s later. Ho8:bqp*)j1k9d i ta: rlw9otbjw 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题库网 (https://tiku.one)，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 4.00 s. The temperature9;gu -( c;a3t/tst, nyyuygil 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 dwr2*-/ad c7hbtq 7 g3jzv2o tcistance to the lig3ovtb27wc/c*rtzag-j hq7 2dhtning strike is about

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 kxmpa2yhq,h j9 7*6dia 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 hear the splash 23cee8k -g2elb .5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of soubkeg3le ec -28nd 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 waa)c6c fqsv3xv v za-3.6vs7v eve 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 airz,z36xk8 5t r)x, v6bmupqjtm 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:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
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 weeub39in; lo+ ith 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 of a 70-dB so1ls x kq0qk2g:und?

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 zfpmq kqg/mwie -1h023n/ k/ hwith intensity levels of 70 dB and 40 d h mz gni0-fq3/hp1k qe/wm2k/B?

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 enginus,iyes+(ad6zt 2 zxyl2.l7a es in a garage is 100 dB. What is the intensity level gener+s6. z2 2ye d(xutis7l,alzy aated 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 dis2ediz2ba w,9x ;am 2x8cva :qatance of 6.0 m from a source that is radiating equally in all direm2bv9zi ax :wcq28, ex2daa;a ctions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
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 that is radiajj5hxv k;o o*/ting equally in all dik *ojo;jh/vx 5rections 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 assum(hkumn,+ ms7lij 9 b2c99)tarf igd n1ed to be uniformly distributed in all directions. What is f, i2+( 1nm)7mg9k9brhlc aujt i9dsnthe 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 6 par:u66l(b *cd128 sxtj ecxz5 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are barpaxjzd ct8xs661rb c*e ul2(:king?

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 fromvv u8(vaqh 0a+9uft54 vky+iqcm;4 im a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radivuvi(4ak5qiyc t+mu8+v ;fv0q 9h4maates 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 95 dB. At what d//rt juvw.3) mr:d ueristance will ir3w u /:jvtr.r) ue/dmt 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 ofreor .d)b js39u3a kt2 27 rk-ytlrs.t a complex tone has a frequency of 1200 Hz. What is the frequency of theks. oer r.7bdsr2ttl23ju3 - krtay9 ) fourth harmonic?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harc7m2m lq3eab .monic of an open pipe is 900 Hz. What is the length oe.qb273a m cmlf 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 2m:uybr);r/0p hhs1wyx8 cq lpipe of length L is 400 Hz. What is the frequehbm:hurx0srcw 8; y1y/ )ql2p ncy 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 velocity of soutv t9m 87 7udd0ho u-,;,rltnrbp lh-und in air is 340 m/s, what is the frequency of the second harmo9uot7bptu - udhl0,tl n m,r8v -dhr;7nic?

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 wkr-3(h+cn r din a room where 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 a pipe closed at3 i n *9rtp2qnl+3eney one end is 330 Hz. What is the frequency of tnq*ip yn 2ee3 n+t39lrhe 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 the shortest pipe closed on one end that bu+i2gi3pdmei*1u j ;will have a fundamental frequency ou 2ii 3pme+;guj 1ib*df 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 where )3m 8exaeps5 othe 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 is0n4p hkm7de, m8wa5sq 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 speed of soune-v30jv/h rez7 ma;fc5h7hug d in air is 340 m/s. What is the fundamenta /vhj ; eh-zfgecah7rv053 m7ul 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 lengjptpjqd0o4- q(hi:j1n3 hxp .th: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, whan- pjtqh 1:jhqdpx04(i.o p 3jt 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 frequency of 800 Hz in air where the vel4,pp6yv h,pek ocity of sound is 340 m/s. How much fartye 4,ph6kp, pvher back would source 1 have to be moved so an 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 and driven 55dbzg(nj*bx.sf:d7 rvdau e h )*v3 vby 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 fromdabv b37)dgh:v*su(en vdr x.j*5f5z 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 beat f-convolhc3, j3 xk.z8qs9x, x requency?

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 form3aq i.5q.re fk to tune the frequency of a musical instrument. If the tuner hears a bq5r3 am ieq.f.eat 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 7 m respectew.8t agsigkjfq0), 4ively. What beat frequency is heard when the horns are sounded on a day whengq,fi4 s0ke ja8 g).wt 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 a8 p ko(fyaoq)hhq ;fx- .t;;xin 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 bring tho )8p hqyh.;fkaqx(f; ox;i-tem 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 s3mh q+eld-/sltationary 1000-Hz sound source at twice the speed of sound. The observer hears a frequency om /-qslh+3ed lf

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 of 1000 Hz) approaches a sq1zact,:vx93 z6ux7 jqx p w2stationary observer at one-half the speed of sound. The observer hx: 3xupc7x sw1z,tjzq q9a26vears 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 of 30 m/; nfmp,arjw,d ;z-9/t3oxcic s away from the source, what is the frequency heard by the observer? (The sound spacid on/m-r, x9zj t; p3cw,f;eed 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 al/n5tc8isuer de 3m ,:t 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 std 3 5l:mtu/8ernce,isanding 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 hear rx8 p*nl23zgqd by a stationary observer when a train approaches with a sppn rqz82lx* g3eed of 30 m/s. The 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 train bl gc;m x6t,g*ngy sbt4;ows its 400-Hz whistle. Take the speed of sound to be 3406 mgntcgbxy4s gt,;;* m/s. What 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 trai7fq4r(r9;hble o f4ck3eyz s47o vqq(n blows its 400-Hz whistle. eo(lhyqc4s7 fz 3bq7(9 o4;e rq4 kvfrTake 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 at 120 07a3v x+rc opg:lzn;f9lgj. ckm/h. The train blows its 400-Hz whistle. Take the speed of sound0gr:nczva9f 7xol lg3jc. + p; 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 /gc1z9 i g,ig 3z)lwzucj*5gmat 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed ofc15jg g z9 ugl,g)iw /ic3zzm* 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 gi.p4sik+w6es 7(yn cg)s +ij 340 m/s. What is the frequency heard by an observer if the observer is moving a(pyg.4w 7 s+cg+jinik) is6 esway 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 airg)zl;jo wa okyzo1 u)aq224-f is 340 m/s. What is the frequency heard by an observer if the observer is approaching the trail-qo 2z u1 j4aw;)f ooygakz2)n with a speed of 30.0 m/s?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 an object. A 40-kHz signa rayi,;px46 mst9t*n dx: +ue65yzknbl is sent out, and a 42-dpy,ix+sa;9 k : *tzyxmn54un6tr 6bekHz 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 wzp i9 n7dar+*vdp55uaave 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 conical v3xytn0 :zl- :ad; djjshock wave j :-;z:d tx ajyn30ldvformed?

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 Unitediv*/ a1g mng;d States to Europe with a Mach number of 1.05 where the air temperature is 1*;ng vad/gim $5.0 \; ^{\circ}C$. 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
    本系统支持习题练习，作业与考试三大模式，作业考试自动评分，成绩排序一键导出，可设定动态变量同一试卷千人千题
    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!   © 2024 题库网 (https://tiku.one)版权所有

    浏览记录|手机版首页|使用帮助|题库网 (https://tiku.one)

    GMT+8, 2025-8-16 19:35 , Processed in 0.591632 second(s), 195 queries , Redis On.