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In Reply to: RE: LEDS and audio posted by unclestu on March 27, 2015 at 12:27:51
"Photons hitting an electron will generate another photon or even another electron. Doesn't explain why or the mechanism just that it exists."
Please pardon my interjection here, but this beggars belief. You claim that one can actually create an electron where none existed before? I will definitely investigate this further, but methinks that perhaps you have misread something, somewhere. After all, one of the basic tenets of physics is that energy cannot be created, it can only mutate from one form to another. Do you happen to have a supporting link?
Very interesting indeed...
-RW-
Follow Ups:
of googling Quantum electro Dynamics did you miss?
Electrons are not "created" but dislodged when a photovoltaically active surface absorbs photons. I suspect this is what he was getting at. Linked article for details.
Yes and no. The photoelectric effect is one thing, and has been investigated quite thoroughly.
QED traces, although gives no explanations, of electron/electron/ photon interaction. Two electrons can collide and product an electron and a photon. Remember in QED electrons and photons are interchangeable. The photons act almost a deliverer of electron states, so to speak, to a different set of electrons....NOt easy to understand and certainly not so intuitive.
found somewhere on the web...
my 2 cents...
Alexandrite is famous for dramatically changing from a medium-dark vivid green in daylight (or daylight-equivalent fluorescent light) to a medium-dark vivid red or sometimes purplish red under candlelight (or incandescent light). Top Russian alexandrite is reportedly closer to a pure green-to-red change, while Brazilian alexandrite switch hits from bluish green to purplish red. Both are extremely rare and valuable.
In years past, any gem material that exhibited similar color change was called "alexandrite-like." But because gemologists encountered different color changes for gem materials other than chrysoberyl, the term "alexandrite-like" was phased out for an all-inclusive term, "color change."
The color-change family includes numerous natural and synthetic gems. The most common imitation of alexandrite is synthetic corundum. Synthetic alexandrite-like sapphire has a color change that is typically more bluish in fluorescent lighting, and more purplish in incandescent. Some natural sapphires also show a change of color, and while they do not go from green to red like alexandrite, they are closer to natural alexandrite than the synthetic corundum.
As for what you've seen recently, it could be a lab-created material called "zandrite," which is being increasingly featured on TV shopping networks. Obviously, the marketing gurus who named this gem wanted to link it to alexandrite, even though the colors do not come close to the true alexandrite change.
http://en.wikipedia.org/wiki/Photoelectric_effect
It is what Einstein won his Nobel prize for (not Relativity)
jfeldt, thank you.
~D
Wherever you go there you are.
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