Talk:Light: Difference between revisions
imported>Robert Tito |
imported>Greg Woodhouse (Photoelectric effect) |
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...into the greater narrative to make the entry less WP-like.--[[User:Robert W King|Robert W King]] 10:32, 7 June 2007 (CDT) | ...into the greater narrative to make the entry less WP-like.--[[User:Robert W King|Robert W King]] 10:32, 7 June 2007 (CDT) | ||
:Reinstated QM - as light IS QM in effect and description. - you may consider this an editor decision. [[User:Robert Tito|Robert Tito]] | <span style="background:grey"> <font color="yellow"><b>[[User talk:Robert Tito|Talk]]</b></font> </span> | :Reinstated QM - as light IS QM in effect and description. - you may consider this an editor decision. [[User:Robert Tito|Robert Tito]] | <span style="background:grey"> <font color="yellow"><b>[[User talk:Robert Tito|Talk]]</b></font> </span> | ||
== Photoelectric effect == | |||
The basic idea is that individual photons carry a fixed amount of energy. It increases with frequency (which is why X-rays and UV light can be dangerous), but is otherwise fixed. Now, if you shine a bright light on an electric plate many, many photons will collide with the plate, potentially displacing electrons when they do. There is a certain amount of energy needed to displace an electron from an atom, creating current (or a "click" from a detector). As you start to reduce the light level, the ''number'' of photons is reduced, but not the energy. This means that individual photons are still able to displace electrons, but there are fewer of them, and so fewer clicks. | |||
Incidentally, Albert Einstein received the Nobel Prize for his work on the photoelectric effect. [[User:Greg Woodhouse|Greg Woodhouse]] 14:49, 7 June 2007 (CDT) | |||
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Moving Quantum section
...into the greater narrative to make the entry less WP-like.--Robert W King 10:32, 7 June 2007 (CDT)
- Reinstated QM - as light IS QM in effect and description. - you may consider this an editor decision. Robert Tito | Talk
Photoelectric effect
The basic idea is that individual photons carry a fixed amount of energy. It increases with frequency (which is why X-rays and UV light can be dangerous), but is otherwise fixed. Now, if you shine a bright light on an electric plate many, many photons will collide with the plate, potentially displacing electrons when they do. There is a certain amount of energy needed to displace an electron from an atom, creating current (or a "click" from a detector). As you start to reduce the light level, the number of photons is reduced, but not the energy. This means that individual photons are still able to displace electrons, but there are fewer of them, and so fewer clicks.
Incidentally, Albert Einstein received the Nobel Prize for his work on the photoelectric effect. Greg Woodhouse 14:49, 7 June 2007 (CDT)