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://autodiscover.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://autodiscover.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 false sta ue(h54gwux 3etement?

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 f3( o3arm yj5wo59abcaastest 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 steel rodxjuotxp c s+8*g5e9c33mqka )?

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 iy; /j -jqy4bihtkh e;d,sif*9ncreases, what happens to the velocity of sound? (Assume that all other factors rema-eh4yi/q,j bfk;;dhsy* j ti9in 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 of a 2:soi :ufbzmba dw.n 6z(5//;1nyrki x00 Hz sound through air i b(ys:/kid6x:urab m5n.z ifn/ wzo1; s

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 ij hfjt5e7y r5mbis)c70 y .gs6n air 5sj0.7tm6ye5h7biyr cgs ) fjis

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 frequenc5cg;e dpxf /w5pnp/9 ties 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 leix8y 5ie)v3-b6vk k7l8k r dsxss than 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 directions.)xnv nb: m4 9swqy,trz1cw; x4 If you move to a poi,vr y:x; b)mc1s wwn9qxn4zt 4nt 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 divergin535gxoy5h+jdq 6, (w pyer(ub; ewbuhg 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 poig42 dc6b v+ngvnt source at a distance d from the source is I. What is the intensity atg6g2 vvn+4 bdc 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 in dtwuye( -/gvb*hjelm+j e; 6p4 9w:fz all directions. What happens to the intensit ee p4zw /wf; tyjj(u*h:lm-+gved9b6y of the 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xxxxxxxxxx，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 a sound source qdgnh,.o4clqgqq ,g 4/ev i 03e osq9/8s+mosthat is radiating equally in all directions. What happens to theqe eq,dg3nm9i4, vh+/s gsc ol.soq40qqo8/g 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 increase -nuq my8ve-6gs as a sound becomes louder?

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xxxxxxxxxx，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 a pure tone. Whayp+5b9 4x+/5gk jw ev9lpfoj ct characteristic of the sound yp95f5 4 9klgj/o+jevbc p+xwincreases?

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 musiu*b bsphzf8p k5 .pnujoh 2 .g-oh;j57cal 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" of;cu1v82idp vco+bap4 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xxxxxxxxxx，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 au;0lxo m hu3.qir 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 z2rzpa -ht6a l 0:zk7dwaves 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 gs8ljube2j)nt1 wjvu 12n-t63+ dcke sound wave generated by the guitv 2ee 8tk+ 1c-d2ju3 1n6bun )jsglwjtar as a result 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 which is open at both ends, therecd 69 m0f3,f;irdnt+nwgh :nr

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 wavldd+9q8l (wzkp 1 wla2elengths of the three lowest tones pq2a8lz 1kdlpw(+wd l9roduced 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 lenemt)my,0 .axm*e j ,o3d+vc anw33olxgth L is 200 Hz. Which one of the following frequ3etmmnx) a, wy3*d3mclo xove+ a0,j. encies will not resonate in the same 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xxxxxxxxxx，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
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 iteeo:4c,tepq* 1.nhe d s fundamental frequency. Which statement isdet.*1ceqeeh p,4no: 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 o, y22eb+lloxniu ) 6(*nylo 7qlzjop* pen 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 x y.2h2li:cmb length L. What are the wavelengths of the three lowest ton2yc: hl imx.b2es 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 jc/kv +d(36 gte2x pgma closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that p/vxkj6ggem+t(2 3cdpipe?

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 cloon*q bqvx1f1 a4 ,eneu42h5qpt9fc h -sed at one end is resonating at its fundamental frequency. Which statement2nahufq o vx11cbp 4h,e5nt*q4 fqe9- 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xxxxxxxxxx，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
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. Each speakero.f mx b*w1l9qxzm10 yxks9:qtan8wdz1k s.9 prodxt1 w :.x09skznm.sz oak91f1*xlqqw8md9yb uces a tone with a frequency of 200 Hz 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 85tc c+ *2jpuxjubue;, 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 sounded together and a particular beat 0ix7 pwr7 riz2x9/dwhrt g ;h7frequency is heard. What hrt0h97ir w wi/zdg7hr72 p ;xxappens to the beat frequency if the frequency 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 explarp 4dmak8k3-)qk 6zoaadp 8r+ins

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 7ay9h2 x dn-ljo u1xbpr6z8 q7by the observzrlyj nh6qd1x29ua 7-p7 8o xber 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 frequency heard by th.vl.q( oha9+e ppqqe+e obs (++qaevqo lpp9eh. q.erver 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, its half-angiqcuso 4q q:ip6*6a5hle will decrease by a facq6 sqiq 4*ohc5p6ui:ator 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//e3u5+eopi j/rs a s5qs. What is 3jpse5 a/sre5uo+/qi the air 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 o1r9nfw2td7 a/j ) p3yjblwde,f 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 *et wq6-shtyv i2z18 ga shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back theiz e2qtwt * 8sygh61v- 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 heah vqyv-vugaq9c :z+3:r 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 distu;pskbeb;(0a 8rdt0 ea(p ip -ance to the lightning strike isp deaa0 u-p8t(;b ksbpr0i;e( about

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xxxxxxxxxx，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
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 temperature tr9 8xx( +pt.yalhpk2g;7in y 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 de a iv/t,-g+x2p upirbqq j5e2- 7 t:ib,d:ssffep well and hear the splash 2.5 s later. How deep is the well? (Iqf/:x di-t2 fti ve,b7+-suapjq,b 2g:5 sripgnore air resistance, 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 lgvu2:tr/eo 8 (cso1 p e-m;f.k9hjbuHz 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xxxxxxxxxx，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
45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in air-f ym*3e,1q:hrwqora 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 withv as3r -g,mo/v 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 sou5m)ei kwi,fx3shy )e 1nd?

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xxxxxxxxxx，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
48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of7v2q 1ianelg, the intensities of two sounds with intensity levels of 70 dB aeg72lqn a1,vind 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 engines mgeg k ttba6 i(-)w:r )c5uyx(in a garage is 100 dB. What is the intensity level ge wcaeiyt gtmb(-6 rg))k:u 5(xnerated 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 distance of 6.0 m fri3w5vo(9jex tdj 9l s(om a source that is radiating equally in all directions 9l (9dxe(tv joji3sw 5is
$6.0 \times 10^{-10} \; W/m^{2}$. 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 4n)*m/zpn fcn38 fm lvm from a source that is radiating equally in a*cnn)nz lvm4f m3 /f8pll directions 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xxxxxxxxxx，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
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 8y pr,ho.jnnp3 x rcd,n.tj ++;/yixeuniformly distributed in all directions. What is the intenxr,nphc/+nn38 topj+ yejiy.;xd .r,sity 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 dBc9lb-ep:b w7h at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogple-9 b hc7b:ws 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 frz gmcw8)r5. rkl 5k ,xazdne.5om 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 radiates equally in all lz8g55xc rk.rw)dn m5kaez . ,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 tsbs w 3k2dv0.distance bwdkv 0ts.s 32will 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 has a frequency of 1200 Hz. What is the frroo)ij wb40rgwl,3 t 4w- cfh,equency of the w rlt,cf)w4b 3ih -o 4gr,0wojfourth 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 a4ppq4 q22i* n ljacy01m me6fis 900 Hz. What is the lengtm0*jip n 6lam4f q2ae1yqc4p 2h 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 hg(r- s+ ltiyzx6 q: h;)d4ctvis the frequency of the lowest tone that will resonate in an open pipe of lengtli-)c (xy6dg ; vs4:hzt+h qrth 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 le no4 hm,2fwt)up0(hwqt *9wzsngth of 0.80 m. If the velocity of sound in air is 340 m/s, what ( hw0)nqm4*t h otspz,fw2 9wuis 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 tempe:bq cl5grup/u 0+npd( rature 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 one end i/acomvsq34dgg:0q 2*x mu)d ks 330 Hz. What is the frequency of the thiq: * 0vumg/dkq2xmgs 3do4)acrd 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 3n)6dq95as iqfiv x,oi+vpa1 will have a fundamental frequency of 60 Hz on a day when the velociqoixvi aqid,)nf53a 96s1+p vty 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 temp3uvo7d k/cna 3udz12o/ r yqp-erature 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 islix3 c8w9lm.ti a r;q1toa8h: 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:    
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xxxxxxxxxx，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
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 sound ino vp m o5gtm*3j4i: gbxw;5r*a air is 34gg;*irbt54j 5ov* mw:x 3op am0 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 same52jg7 :dwxmr. zstt+w length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is thjgwt+7 dw2szxr5.tm :e 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xxxxxxxxxx，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 sz3h52lvo wh*a/(wqtemit 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 observer in front oalo(3s*w5vh q /w 2zthf 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 o 3y,dw-skb3jq cb2 0ronooh9goj;o cz .r1)i8f 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 from the perj;82o k)nqr0bg r.3cwz39o b d oo1-o,cjyshi son 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 x: u/nv27m*hlf dq py)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 szc7 c(7i 9kks .ali1pthe frequency of a musical instrument. If the tunklp sc 9za(.1ks 7i7icer 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 soun+ a0 mctr+t7y3 4c4rw;iykzxnds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded 4xn0m++carr;t7yzkwi4c3 yt 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 vio; mkd6gxr7a 5glin strings on 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 i5k 7agrm;gx 6dn 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 approachb.d)4dyesn5 q es a stationary 1000-Hz sound source at twice the speed of sound. The observe5ds4nbdq ) ey.r 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 qk,o k8w+n,th*uj// su0a kzrvp .o/s of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a freq hntzkr,k*j/+a.0s vo kw//upqu8s ,ouency 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 speys5*wjx g;2uzktf+ bl k7 g--aed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed isk -b g 5y+ga-tjxwz;k 2slf*u7 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 a6 h0e0fig4 tur day when the speed of sound through air is 340 m/s. The car approach6hir t0f0ug4ees and passes 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 observer wh /qbqc9 hq8)cv laio 8k,.uci*en a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and t8u/8hq, 9kqi a*iccvb qo.) lche 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 train3xu k2fjzy5)i blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you heari5fy u)kxjz23?

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/h6w;yj,cj; g:mpoz 1j af8p6ng toward a stationary train. The train blows its 400-Hz whistle. Take the speed of souny6o,1pjm gjpg:j;;86w nafzc d 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 km/h. The tr9j(7ir9k ztzi ain blows its 400-Hz whistle. Take the speed of sound to be 34jri( tzi9k 7z90 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 awa,hq- h8rcvz;(; wbgdfy from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take theg 8 v(z;w,fb-r ;dhqhc 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 ho;v2 rit,89tv q zq; 8njwgm5jprn 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 train with a spjq,nt8i59vpz ; 8t gqrwj v2;meed 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 Hz2/,xe4 f6xsrnkjtg)g . Assume the speed 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 30.0j/e f 6tkxxn) gg,s24r 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xxxxxxxxxx，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 40-kHz sixl k ,;bqtb5sas9yz+b)q 6;ojgnal is sent out, and a 42-kHz signal 59 )bszq b;aqx6 k;stj l,ybo+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 bp+n7 i eo0w*g 4fieau-y 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 v )m:kif(f-ni wave formekf (- in)vmfi:d?

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xxxxxxxxxx，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 from the fup0q kq4ou0*b lr9 mq )*eqp65qcv:qugy)z,United States to Europe with a Mach number of 1.05 where the air temperr v)qe0o *4 9lqquqqu5pfq6mpgyb u),c*zk: 0ature 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

    试卷内容到此结束!   © 2025 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, 2025-12-20 05:50 , Processed in 0.629695 second(s), 204 queries , Redis On.