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wave property

Posted: Thu Oct 18, 2018 6:54 pm
by Julia Lee
Hey guys,

So just to clarify, we cannot use the DeBroglie equation for light/photons since this is only applicable to things with resting mass?

Re: wave property

Posted: Thu Oct 18, 2018 7:07 pm
by anishathomas
Yeah photon's have zero mass and therefore you can't use that equation. Instead, you use the momentum to figure out the wavelength.

Re: wave property

Posted: Fri Oct 19, 2018 6:45 pm
by Adriana_4F
What do you mean by resting mass?

Re: wave property

Posted: Fri Oct 19, 2018 9:51 pm
by Raymond Ko 1H
Adriana_4H wrote:What do you mean by resting mass?


Resting mass means that when an object has no velocity (momentum), such as a vase sitting on a table or a book on a desk, the object has a mass that can be measured. Photons do not have measurable mass without momentum, meaning they have no resting mass.

Re: wave property

Posted: Sat Oct 20, 2018 1:11 pm
by Austin Clack
piggy backing off that last response... how is a photon's mass calculated when it does have momentum? If an object has no resting mass, does this mean it must have measurable mass taking momentum into account?