查看完整版本 : EYE

dustbus 2013-8-8 10:19 PM

EYE

[url=http://www.youtube.com/watch?v=ElUEBkPSkmM]http://www.youtube.com/watch?v=ElUEBkPSkmM[/url]

請問0:11入面
sodium ion,chloride ion,potassium ion對眼有乜野用:lDD_011::lDD_011:

↗亢龍無悔↙ 2013-8-8 10:38 PM

你都幾無聊嫁喎



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dustbus 2013-8-9 12:48 AM

唔係

見到廣告有

想問下有乜作用@@學完chem都唔知

↗亢龍無悔↙ 2013-8-9 08:35 AM

[quote]原帖由 [i]dustbus[/i] 於 9-8-2013 12:48 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=368968178&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
唔係

見到廣告有

想問下有乜作用@@學完chem都唔知 [/quote]
眼入面有aqueous humour 同 vitreous humour,果啲ions應該係仿效humour 成份用黎養住隻眼
但係又唔多make sense
1.  眼都有好多血管同埋有humour 養住
2.  淚線會長期放眼淚出黎保持隻眼濕潤
3.  眼表面有一層conjuntiva ,同皮膚表面層皮一樣係non-living ,即係只要保持佢濕潤就得



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dustbus 2013-8-9 02:46 PM

[quote]原帖由 [i]↗亢龍無悔↙[/i] 於 2013-8-9 08:35 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=368978100&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]

眼入面有aqueous humour 同 vitreous humour,果啲ions應該係仿效humour 成份用黎養住隻眼
但係又唔多make sense
1.  眼都有好多血管同埋有humour 養住
2.  淚線會長期放眼淚出黎保持隻眼濕潤
3.  眼表 ... [/quote]

咁d ion會唔會用黎殺菌:lDD_011::lDD_011:

[[i] 本帖最後由 dustbus 於 2013-8-9 02:47 PM 編輯 [/i]]

Zzlaz 2013-8-9 04:01 PM

無睇片
但係唔係模擬番眼淚水的成份



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↗亢龍無悔↙ 2013-8-9 04:20 PM

[quote]原帖由 [i]Zzlaz[/i] 於 9-8-2013 04:01 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369006521&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
無睇片
但係唔係模擬番眼淚水的成份



http://i.discuss.com.hk/d/images/r10/androidD.jpg [/quote]
係都唔出奇

反而樓上咪咁無聊開埋啲膠post
你又唔係讀bio,問咁深入做咩呢?
初初我會睇片,以為係問緊神經線,因為sodium ions potassium ions 係傳送 nerve impulse 扮演好重要ge 角色,我解得咁深你都唔會明啦



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dustbus 2013-8-9 05:08 PM

咁冇分有冇讀bio既~~

只係想知道下

Zzlaz 2013-8-9 05:12 PM

而加理科好多人都口吾会讀哂
有好有唔好啦



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dustbus 2013-8-9 05:51 PM

HAHA咁轉問番phy


why there are dark and light bands in the diffraction patterrn of light???

↗亢龍無悔↙ 2013-8-9 06:20 PM

因為diffraction 其實即刻interference.
hyxxxxgen principle 話 every points on a wavefront should be treated as different point sources.



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dustbus 2013-8-9 06:53 PM

[quote]原帖由 [i]↗亢龍無悔↙[/i] 於 2013-8-9 06:20 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369015183&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
因為diffraction 其實即刻interference.
hyxxxxgen principle 話 every points on a wavefront should be treated as different point sources.



[img]http://i1.hk/d/images/r10/mobile.jpg[/img] [/quote]

OUT C?

but願聞其詳

咩叫diffraction完左即刻interference?

明明得一個slit,點樣interference?

Ron~ 2013-8-9 08:04 PM

一個slit點會有interference:L



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dustbus 2013-8-9 08:25 PM

[quote]原帖由 [i]Ron~[/i] 於 2013-8-9 08:04 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369020862&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
一個slit點會有interference:L



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

:lDD_001::lDD_001:SHOULD be out C?

[[i] 本帖最後由 dustbus 於 2013-8-9 09:35 PM 編輯 [/i]]

jmlo 2013-8-9 10:24 PM

回覆 12# 13# 14# 的帖子

Single-slit diffraction is possible. FYI, check out the following site for a brief account of the phenomenon.

[url]http://www.math.ubc.ca/~cass/courses/m309-03a/m309-projects/krzak/[/url]

jmlo 2013-8-9 10:26 PM

回覆 11# 的帖子

Huygens principle ... :loveliness:

↗亢龍無悔↙ 2013-8-9 10:54 PM

[quote]原帖由 [i]jmlo[/i] 於 9-8-2013 10:26 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369029934&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Huygens principle ... :loveliness: [/quote]Haha I forget how to spell it

Just like burxxxxxxli principle in fluid mechanics. Lol

↗亢龍無悔↙ 2013-8-9 10:57 PM

[quote]原帖由 [i]jmlo[/i] 於 9-8-2013 10:24 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369029790&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Single-slit diffraction is possible. FYI, check out the following site for a brief account of the phenomenon.

[url=http://www.math.ubc.ca/~cass/courses/m309-03a/m309-projects/krzak/]http://www.math.ubc.ca/~cass/courses/m309-03a/m309-projects/krzak/[/url] [/quote]Excellent:smile_o12:Although hyxxxxxxgen principle is out c, diffraction grating still appear In DSE

This part is the most difficult part in wave

[[i] 本帖最後由 ↗亢龍無悔↙ 於 2013-8-9 11:02 PM 編輯 [/i]]

dustbus 2013-8-9 11:36 PM

thx all ching:lDD_010:

dustbus 2013-8-10 12:24 AM

[quote]原帖由 [i]jmlo[/i] 於 2013-8-9 10:24 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369029790&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Single-slit diffraction is possible. FYI, check out the following site for a brief account of the phenomenon.

[url=http://www.math.ubc.ca/~cass/courses/m309-03a/m309-projects/krzak/]http://www.math.ubc.ca/~cass/courses/m309-03a/m309-projects/krzak/[/url] [/quote]睇完都唔係好明

佢做左好多數學既derive

但都唔太明點解單slit有interference

↗亢龍無悔↙ 2013-8-10 08:18 AM

[quote]原帖由 [i]dustbus[/i] 於 10-8-2013 12:24 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369039312&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
睇完都唔係好明

佢做左好多數學既derive

但都唔太明點解單slit有interference [/quote]
因為hxxxxgen principle 話,every point on a wavefront should be treated as different individual point source. therefore, when a light wavefront approach a single slit, we should treat it as many point sources approach the slit as well. different point sources donating that there have path differences (that is the second figure in the link given by jlmo ching )
所以diffraction 即係 interference
申報,我light interference 係求其睇兩眼就走去考AL,不過09年一條short question 同mc 都無出過,呵呵



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dustbus 2013-8-10 12:31 PM

wave果然al最難

但個情況係只係for light?

有個vibrator整左啲wave,個wave pass through 個slit咁會唔會都咁?



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↗亢龍無悔↙ 2013-8-10 02:07 PM

[quote]原帖由 [i]dustbus[/i] 於 10-8-2013 12:31 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369063810&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
wave果然al最難

但個情況係只係for light?

有個vibrator整左啲wave,個wave pass through 個slit咁會唔會都咁?



[img]http://i1.hk/d/images/r10/mobile.jpg[/img] [/quote]其實所有wave都係,包括water waves, 不過果啲wavelength咁大,你睇唔出分別
所以都係當佢係一個wavefront after passing through a slit

dustbus 2013-8-10 02:39 PM

OKAY THANK YOU

dustbus 2013-8-10 10:27 PM

del

[[i] 本帖最後由 dustbus 於 2013-8-11 12:46 AM 編輯 [/i]]

dustbus 2013-8-10 10:27 PM

Wave入面sound其實係唔係唔洗點理?我見wave題已經少,應該出得多young double果d?

[[i] 本帖最後由 dustbus 於 2013-8-10 11:50 PM 編輯 [/i]]

↗亢龍無悔↙ 2013-8-15 09:03 AM

原本打算等得閒先詳睇,點知你自己delete左



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↗亢龍無悔↙ 2013-8-15 09:22 AM

[quote]原帖由 [i]dustbus[/i] 於 10-8-2013 10:27 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369101462&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Wave入面sound其實係唔係唔洗點理?我見wave題已經少,應該出得多young double果d? [/quote]
CE sound黎講好簡單,可出題形係padtpspers有哂,亦都諗唔到有咩新樣可出,不過noise果到有少少野要背

AL sound黎講,只係多左要識計dB,都幾簡單下,比起其他AL topic都易好多,少出,不過好似已經cut埋



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dustbus 2013-8-15 02:36 PM

[quote]原帖由 [i]↗亢龍無悔↙[/i] 於 2013-8-15 09:22 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369456140&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]

CE sound黎講好簡單,可出題形係padtpspers有哂,亦都諗唔到有咩新樣可出,不過noise果到有少少野要背

AL sound黎講,只係多左要識計dB,都幾簡單下,比起其他AL topic都易好多,少出,不過好似已經cut埋


... [/quote]
原來我自己睇錯題==所以DEL左

BTW THX龍哥
計dB同埋地震果D好似放左洛math core

[[i] 本帖最後由 dustbus 於 2013-8-15 04:28 PM 編輯 [/i]]

↗亢龍無悔↙ 2013-8-15 10:59 PM

[quote]原帖由 [i]dustbus[/i] 於 15-8-2013 02:36 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=369476052&ptid=22285049][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]

原來我自己睇錯題==所以DEL左

BTW THX龍哥
計dB同埋地震果D好似放左洛math core [/quote]Oh, try this question then~
The sound intensity level is 60dB, 20m from a loudspeaker.
If the power of the loudspeaker increased by 3 times, what is the sound intensity level at 4m from the loudspeaker.
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