查看完整版本 : wave

dustbus 2013-9-19 08:08 PM

wave

1)點解我地畫antinodal line同埋nodal line果陣....點解係一開始彎左少少先,之後先斜線上?

2)點解一個WAVE撞洛fixed end到,會有phase change 但Free end又冇phase change?

↗亢龍無悔↙ 2013-9-20 10:40 AM

1) 唔需要知,因為我都唔知

2)  Hint : Newton Law of Motion[url=http://www.discuss.com.hk/android][img=100,23]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img][/url]

dustbus 2013-9-20 02:35 PM

[quote]原帖由 [i]↗亢龍無悔↙[/i] 於 2013-9-20 10:40 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=372002113&ptid=22457719][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
1) 唔需要知,因為我都唔知

2)  Hint : Newton Law of Motion[img]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img] [/quote]

2)係咪粒子感覺好似將個牆扯上,咁action and reaction pair,個牆就會扯番粒子洛去?牆MASS大,inertia大,所以好難郁,但相反粒子細,所以佢輸左,比牆扯番洛去?
   咁如果有哩D力既存在既話,點解之後reflect左既amplitude會一樣,唔會有work done against XXX咩:smile_41::smile_41:

↗亢龍無悔↙ 2013-9-20 07:19 PM

你自己都講哂啲野出黎,咪自己答左自己啦



[url=http://www.discuss.com.hk/android][img=100,23]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img][/url]

dustbus 2013-9-20 09:09 PM

[quote]原帖由 [i]↗亢龍無悔↙[/i] 於 2013-9-20 07:19 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=372023827&ptid=22457719][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
你自己都講哂啲野出黎,咪自己答左自己啦



[img]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img] [/quote]

lol because of your hints

btw 唔會有work done against XXX:smile_41::smile_41:

↗亢龍無悔↙ 2013-9-20 10:27 PM

點解會有WD?你個問題咪同人係地面行路個case咪一樣囉,人excert 一個force 落地下,地下excert 返一個force 比人,咁會唔會因為有WD而令後者個力變細左?



[url=http://www.discuss.com.hk/android][img=100,23]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img][/url]

Zzlaz 2013-9-21 12:06 AM

話說我唔識Q.2 WOR, 有無人認真少少講解下.:smile_22:

jmlo 2013-9-21 12:43 AM

回覆 7# 的帖子

Good illustration of the concept of phase change at boundaries.

[url]http://www.acs.psu.edu/drussell/Demos/reflect/reflect.html[/url]

dustbus 2013-9-21 12:59 AM

[quote]原帖由 [i]↗亢龍無悔↙[/i] 於 2013-9-20 10:27 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=372033025&ptid=22457719][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
點解會有WD?你個問題咪同人係地面行路個case咪一樣囉,人excert 一個force 落地下,地下excert 返一個force 比人,咁會唔會因為有WD而令後者個力變細左?



[img]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img] [/quote]
haha you are right thx 龍哥


[quote]原帖由  於 2013-9-21 12:43 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=372042302&ptid=22457719][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Good illustration of the concept of phase change at boundaries.

[url=http://www.acs.psu.edu/drussell/Demos/reflect/reflect.html]http://www.acs.psu.edu/drussell/Demos/reflect/reflect.html[/url] [/quote]haha jmlo ching you know question 1??

[[i] 本帖最後由 dustbus 於 2013-9-21 01:13 AM 編輯 [/i]]

dustbus 2013-9-21 01:14 AM

[quote]原帖由 [i]jmlo[/i] 於 2013-9-21 12:43 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=372042302&ptid=22457719][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Good illustration of the concept of phase change at boundaries.

[url=http://www.acs.psu.edu/drussell/Demos/reflect/reflect.html]http://www.acs.psu.edu/drussell/Demos/reflect/reflect.html[/url] [/quote]

jmlo師兄我見到入面係v=T(u)

但係條式唔係v=開方(T/u)咩:smile_41::smile_41:

jmlo 2013-9-21 02:06 AM

回覆 9# 的帖子

It is the consequence of geometry. You can calculate, for example, the positions of points that make up the first antinodal line, and for each point you can calculate its (projected) horizontal displacement from the sources. If the maths is done properly, you can obtain the relationship between this displacement and the number of wavefronts, and this relationship will tell you whether a straight or bent antinodal line is expected.

The following site may give you some hints how the maths is done.

[url]http://www.physicsclassroom.com/class/light/u12l3b.cfm[/url]

jmlo 2013-9-21 02:06 AM

回覆 10# 的帖子

I saw c = sqrt(T/u)

(here c is the speed of wave; same as v)

jmlo 2013-9-21 02:07 AM

回覆 7# 的帖子

Congrat! You reached 20000! :loveliness:

dustbus 2013-9-21 02:08 PM

[quote]原帖由 [i]jmlo[/i] 於 2013-9-21 02:07 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=372047155&ptid=22457719][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Congrat! You reached 20000! :loveliness: [/quote]

what you mean:smile_41::smile_41::smile_41:

btw thx ching:smile_40::smile_40:

[[i] 本帖最後由 dustbus 於 2013-9-21 02:09 PM 編輯 [/i]]
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