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Electromagnetic By Artist: X dream

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X dream - Radio - Electromagnetic - Free MP3 Ringtone

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comments


Columbine	2008-01-15 10:46:50
my teacher speak perfect good too..but he never knows how to explain....

Fleur	2008-01-31 01:57:17
Take a look at the photoelectric effect, for which Einstein won his Noble Prize for his work in. When you shine light on a metal it has been found that electrons are emited. The wave model would say that the energy should be proportional to the square of the amplitude of the waves. But what happens is that there is no correlation between the electrons emited and intensity, but instead the frequency of the light determines the energy of the light. The wave model fails here.

Shannen	2008-04-03 09:15:05
You got something wrong, when you change the intensity of the light, you DO change the number of electrons emited, what doesn't change is the kinetic energy gain by those electrons, since the energy quantum is the same (hv) but if you increase the intensity you send more energy quantums so more electrones will be stripped off the atoms but all with the same energy

Roddy	2008-04-07 00:09:27
Yep, you've convinced me. This explains it perfectly. Thanks.

Eliseo	2008-07-07 23:32:35
Walter Lewin =D

Raymund	2008-09-01 10:56:41
The easiest way to see it is to just lower the intensity of light progressively, and use a sensitive detector, like a photomultiplier. Eventually you get to a point where you are getting separate pulses or clicks out of the detector. Can't explain this with waves.

Deneb	2008-09-06 20:58:22
This really clarifies what i did in high school. My teacher never explained the concepts, she only gave out the formulas and a few examples so i was a bit confused.

Aryanna	2008-10-11 06:23:32
Great!!! What is the professor's name?

Shelby	2008-10-13 03:33:04
Take a look at the photoelectric effect. When you shine light on a metal, electrons are emited. The wave model says that the energy associated with light is proportional to its intensity (amplitude) squared. What happens in experiment is a bit odd, and in fact does not support the wave model of light. Instead, the energy of light is proportional to its frequency. (E=hf, ~8:00 in) It is a bit more complicated, having to do with kinetic energy of the electrons, but wave model cannot explain this.

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