Two things i'm not sure about when i was revising:
Why can we change the wavelength of a matter particle but not of a photon? still unanswered need help on this urgently please.
Why can't an electron absorb several photons to escape from a metal?
Help would be greatly appreciated
Last edited by coolstorybrother; 14-05-2012 at 10:28.
aah hence why only one photon can be absorbed at a time?
(Original post by Pangol)
The particle model of light has as one of its assumptions the fact that it deals with a one-to-one interaction between electrons and photons.
yea will do
umm surely that electricity stuff would be in the textbook?
(Original post by SuperFantasticB)
This is the exam definition which you should definitely learn.
I was wondering if anyone has revision notes for electricity. The theory questions keep tripping me up (like where you have to link an increase in resistance to a decrease in current)
why cant we change the wavelength of a photon
Is this something to do with the dual wave partiality of light - as the charged particle emits wave packets of em waves (photons) - it can not have a definite wavelength as a wavelength varies over the distance of the packet?
Last edited by coolstorybrother; 13-05-2012 at 21:28.
What about the Doppler Effect?
What happens to the photons in a red-shifted star?
Damn you for making me think about this!
How many people will be still wondering about this in a couple of hours?
Last edited by Groat; 28-05-2012 at 20:28.