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
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)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://51fly.win/test70.html
 作者: physics  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 is a false statement?zz1 7y-o lel*p

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 conducte iwl: ci919pk+abv;1g cg s3ecd 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 sjcj0 8mr :hn+hteel 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 ai 1 6iy +nid1d i +y46b3xr)1q gxcpkyifq20evor increases, what happens to the velocity of sound? (Assume that all2d61i)rgi4 1 y cne0yvqfop xbdki1+ i+y3q6x other factors remain constant.)

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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 a 400 Hz sound, the velocity of a 20vy/)y,7wgnd1i bu3kc 0 Hz sound through aikn/vub cwd,7) i 1yy3gr 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 soun9dn(euwvmw *3o 9(altd, the wavelength of a 200 Hz sound ine dw9ul*ot9 m vn((a3w 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 grea5g ax;vq mv)3vbmffro,6u ( ,fter 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 4c)k0fgpk u+ a20 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 yzxm(;aw x6)0/ ha 2rvitt*otemitting waves uniformly in all directions. If you move to a po)yta;tm*t(0zaxh v2/r 6wx i oint twice 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 diverging waves, intensity is ppe9;g,e-ed zw roportional 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 pr4o ;awix bf-9ug wo*ka*+.x loint source at a distance d from the source is I. What is the intensity at a distance 2d from.9*g-+okxo4u fbw;*w a xl ari the source?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 radiatincn1n rn0if5 (z ecuv,9g equally in all direction u01f5c i9(v,n eczrnns. 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 d .zn56/lea/1kibvfuis radiating equally in all directions. Whaik 6 f//n du5v.ebzla1t happens to the intensity 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 a0 d -6e8so6dpp:ko 2draal qo(s 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 speaker emitting avpjcri tpx3abmd)1+b ,x4 ;(4*tan kp pure tone. What characteristic of the sound p4bad(;x 1n 4 rxa3tc pi*vt+j,) mpbkincreases?

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 musicwfg9fwl 0( )0+ cjfx(nss7wlxal 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 lcm3y (5op5jtx9j2jl "pitch" of a musical note?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from air i9n ihxru )mvv31ti 7 q32xj,wonto 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 displacei-bg1:,wrub1-;zda h -vv y flment 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 );i;cw/p gfnh5p 6 rxeon a guitar string and the sound wave generated by the guitar as a re e/nh); pp;wcgix5 6frsult of 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 whicqzqky.6 pu 0t7h 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 ofx. i-h;eb+zct length L. What are the wavelengths of the three lowest tones produced .hzt xci+be ;-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 H2a buz uk4es;,z. Which one of the following frequencies will not resonate in the same zkub;2a, eus4 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 frequency. Which snrpw3 r:o 9wr3tatement is3w 9prwr nor3: 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 yb a9uxdk8iu +*lwa9hy )hv7l- yn08pother, 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 the three low 3wiltx6lzq td 3+pl69est tones lpxqtw3 9zidlt63+ 6l 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: r(9k2wabz 6gyyqb5c of length L is 200 Hz. Which of the following frequencies will not resonate in that 5bg2 yw 9k 6(za:byqrcpipe?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 6f.93fx qo n u6aqpg-hend is resonating at its fundamental frequency. Which statemen nafh.9q66o3-p qux fgt 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 same source. Eachrf*v xrv13/yn-/kg/ fke+cwfyw )r xi*n 1xj, speaker produces a tone with a frequency of 200 Hz on a day when the speed of souyfk/ix + wryg jnk1f nvvx*1/3 )wcerf* /rx,-nd 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 two sound waeb:j zl 2geo:+ f08ggoves 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 -by.p ix :l8tqand a particular beat frequency is heard. What happens to the beat frequency if the frequency o.8 b:-qx ilpytf one of the tones is increased?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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 expla xk ss h+ia,ux hf;u30yxux*1/ins

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a stationaryxnb*ohc+ ndj5*u 51tl observer. The frequency heard by the obsexn h5ol + ctdj1u*bn5*rver is

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs frootz eoe rg7t,r t:h;58m a stationary observer. The frequency heard by the obsert,o;otr etzgrh:e87 5ver 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 dz6trh 2j (elqct90fe a ;dm,o9ouble its MACH-speed, its half-angle will decrease by a facthmltjo tr(e q, a9zcf69;d2e0 or 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 is 352 m/z3rktq35 nng9 fae4uo,kpm .0 s. What is the aznaqueop34 9 g30rk,f t nkm.5ir 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 sf7wi)4ph 6rv gpeed 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 spe1gbmmg( s41) ro 0jarned of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected baj1gr) srg m4nmb 0a(o1ck 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 e:p wi1i shmo2(cho 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 96/nn7k 7f bs3z,qmf s4vea mr5.0 s after seeing a flash of lightning, the distance to the lightning strike kanz/ r n3fb7 7mq46ss9fmv,eis about

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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 a cliff on a day the tem01g 5ew btuax;yu 3g9iperature 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 xn7 03;e a;fi59ck1ntrcgo xqthe splash 2.5 s later. How deep is the well? (Ignore air resistance, and asstf5 xg 3ci;enxc9a k;1oqn70rume the velocity of sound is 340 m/s.)

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air of a bfeb m+ t-mxmvy-( z09,w5fzm;o) ba rsound 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 at t27)uf o dnfr,$23 \; ^{\circ}C$ 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 soun z.x3,k qqzch8d 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 of a 70-dB soun u8fitws6.3i rd?

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 levelse q(;t 7iz7s t u(4anaif7ns4p of 70 dB and 40u4 (ztne777p aas(ft;s4niiq dB?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 garagesq/ 0rpb+k uw/ is 100 dB. What is the intensity level generated by one+s/ kb/qrw u0p engine?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a dist-4 c 5otqo4)x)fnp mmwance of 6.0 m from a source that is radiating equally in all dm-opm4t c5 foq4 )wnx)irections 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 that is radiating equally in oovrl 6 +ieb0hh6;0yeall direc ;hy+0iv le60obh oe6rtions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 p(js2trz2 e) wuniformly distributed in all directions. What is the intensity level (tpjw s)e 2zr2at 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 8se.y+ygc)f *5ib7q4ycji5rat a vc* a distance 5.00 m from a barking dog. What would be the intensity level if two identicaiyi)qs e85 ftcgy5a7y. vc4b ac*rj* +l 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 z9(ljczh7tes:b4t:v n ;fag.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 radiathta lvt;:j s9b.ng (ef7z:c 4zes 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.x2mcs1m*vjtgg 6w 62e At what distance wil6ecxw*v1gjm 22 g mts6l 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-h ob)k)k8hebg.) guz tone has a frequency of 1200 Hz. What is the frequency of the fourth hargg.hub 8-ohkez)k b) )monic?

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 open1:ff pahd(.x tvch+a) pipe is 900 Hz. What is the length of the ch+aff1xvap :) td(.hpipe?

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 3qqel8jsq744tv aarr y8 ja2) is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length )yqe lr7s44 2atj8jq rqva a832L?

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 sz2k3j)) d rroo49 gd 6qmxw4uuound in air is 340 m/s, what is the frequency of 44rqz uxm g6ok du9j3)w2od)r 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 thctcl- )w xj-o/km)b g3e 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 at xnjy5pn2/ n 5gw1m+mnone end is 330 Hz. What is the frequency of the third n n5y 2mmxwng+/npj15harmonic?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 fu./gi,3,zpfagh/ p y qmvz5d e.u4p8xi ndamental frequency of 60 Hz on a day when the3/hqpxau,zf . ivd8p i.p gy/z5e,4mg 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 the t 74qwtv( nzas2gmc+r4emperature 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 whernd.bauj ls8 -0e 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 sm4 d: cn*:sjk.ccqbo 8ound in air is 340 m/s.c :cb mk84q* s.:cjnod 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 lbw:ri 5 5tlzd,ength: one is open and the other is closed on one end. If the fundamenta :55bzwri d,tll 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 .xw d 1j-j y(jvp1(cev6um7hn each emit 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 obserd11vjjex- pmy .(vw7j6 unhc(ver in front of the sources would hear no sound?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 freque*vlo4, q) 6tu(ctp:pqtnz) zbncy of 500 Hz. If the distance fromo tz)cvztlb:6p*( q ,n )qput4 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 frequenci ts (c+ozwic+:p:dn8les 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 tuning fork to tune the frequency of a musical ins4 do l*u qg;.w,yatkr,bw:y ffc-+s6gtrument. If the tuner hears a beat fr6kf d;t:wlg -,q,au.y+yb4 w f sgoc*requency of 2 Hz, what is the frequency of the instrument?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the sounds produ 2yp 9hb s9mu.no1e+x4 velgb0ced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sou s9ubepm.b1290nel+ g xo vyh4nded 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 xa74 0.f/c7tifhn tmtviolins in an orchestra are found to produce a beat frequency of t ifm0nttx.7a4fch/7 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:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationary)tm9(l2fxt oj zh;r(l 1000-Hz sound source at twice the speed of sound. The observer hear(ztm 2l)ft jxo;9( lhrs 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 oes7k8 qzqkxny *7z v(7f 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observerz7 eqk*n z(sky8q7x7v hears a frequency of

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 8;j 6oa ellrlz-mm266/jt fdg m/s away from the source, what is the frequency heard lgl8 mj -md ;jl66ertaf62o/ zby 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 siren. It is traveling at 35 m/s on a day wkid3b:1,/vtyd l tke0hen the speed of sound through air is 340 m/s. The car approaches and passes an observer who isi l/tk3dvy: , d01tekb 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 stati1op 9ibq ,hof,onary observer when a train approaches with a speed of b,fo,oih q p9130 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 y*l dqj mk7z8hmo *+e;eou at 120 km/h. The train blows its 400-Hz whistle. *h7qj kzed8e*m m +l;oTake the speed of sound to be 340 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 train blows its 400-H,gud s-;ojdw lh)i 7p/z whistle. Take the speed of sound to be 340 m/s. What fre7 wd,hl/g- so djup;)iquency 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 l 24g3ofn q/bf q:exz/from 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 hear?3b l4gexoz/qn2/q:f f

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 12t(jea-m mf1s,o+x ; zl0 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take thm lj;,(+axeoszt-1 mf e 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 xt0w8mewxf; jc2z shpw6 t1) th-ey +.+wa;cvhorn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the tr.6t-zwhx; +ac08 j ve+x f;wt ycw)wesmht2p1ain with a speed of 30.0 m/s?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
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 spee2lin ,.znvbix/m 54kfgb- no+d of sound in air is 340 m/s. What is the frequen5minkxozgf-v4b +. l/in2bn,cy 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 ankrb.x4m e3btr4gs8 m k05tik + object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object movi4r .ikk e0m43xtb 5g+m 8strbkng?

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 bys7:key 98 5yujarpr *h 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 shock y; y/ v9p , zlu rpyj5m0vt17x,r;aoddwo x;zr7v a pyd0;y,j5ld9p ,1u/mrvytave 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 Stateschk lboecfgw9:nv/,q.j 3/m ( to Europe with a Mach number of 1.0,q. wg( blkc9ov/m hj/f ce3n:5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，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
  • :
    •
    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

    试卷内容到此结束!   © 2024 51fly国际课程 (https://51fly.win)版权所有

    浏览记录|使用帮助|手机版|51fly国际课程 (https://51fly.win)

    GMT+8, 2025-5-8 07:01 , Processed in 0.435429 second(s), 204 queries , Redis On.