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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Jan 2008 09:39:34 IST
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when frequency of incident light is greater than threshold freq electrons are emmited and when freq is less no emission is observed but what happens when the freq is exactly equal to threshold freq????
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5 Jan 2008 09:41:11 IST
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Electrons r emitted but with a very low velocity nearly tending to 0
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5 Jan 2008 22:32:12 IST
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The atom becomes fully ionised but no electrons are released
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There is no better feeling in this world than being a winner! |
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8 Jan 2008 13:42:35 IST
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electrons are just released (in ideal case).......
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"Nenenthedhavano naake teleedu"
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8 Jan 2008 14:11:47 IST
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Electron r released but in nagligible amount...
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Amit srivastava
Always for u!!!
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5 Feb 2008 11:59:33 IST
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photoelectrons are NOT emitted at threshold frequency.... cauz the fastest moving electron is just stopped......
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5 Feb 2008 12:03:36 IST
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e- r just emitted and their KE is 0 just emitted
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6 Feb 2008 00:08:12 IST
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it has very small k.e
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"If u win u need not have to explain and if u lose thn u should not be there to explain"
-Adolf Hitler |
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6 Feb 2008 00:16:37 IST
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electrons are emitted,if u want the theoritical view.....
this is becoz the electron posseses just exactly that much amount of energy that is required to overcome the attractive force of the nucleus....
but these electrons have no energy to move forward,and thus there is no flow of current in this case,except if there is a collector plate at sufficiently high potential to accelerate the electrons....
practically,no photocurrent is observed
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"Many of the things you can count,dont count....
Many of the things you cant count,really do count...."-Albert Einstein
"The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them"-William Bragg
"An inexplicable fact is infinitely preferable to an incomprehensible mystery"-F. Soddy
RISHIPRATIM MAZUMDAR
NIT DURGAPUR
1ST YEAR,ELECTRONICS AND COMMUNICATIONS
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10 Feb 2008 00:55:59 IST
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he my above reply is wrong
at threshold frequency d electron is liberated and it has 0 k.e
it was given in my sirs notes.
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"If u win u need not have to explain and if u lose thn u should not be there to explain"
-Adolf Hitler |
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10 Feb 2008 11:13:06 IST
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if threshhold frequency=probvided energy
then electrons just will be on surface
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10 Feb 2008 19:05:11 IST
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READ CAREFULLY.................
frm photoelectric equation
hv=hv0+k.e
when v=v0 then k.e is zero.......
k.e. is zero so electrons r said to jus cross the potential barrier of the metal...............surface
but since the k.e is zero the electrons r absorbed back due to the creation of equal positive charged on the metal surface......................
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lighten up the darkness............
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10 Feb 2008 20:01:20 IST
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electrons are released but they dont have any KE.
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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13 Feb 2008 08:31:59 IST
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@ ashgirl
den wat did i say.........
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lighten up the darkness............
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