wave property


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Julia Lee
Posts: 80
Joined: Fri Sep 28, 2018 12:29 am

wave property

Postby Julia Lee » Thu Oct 18, 2018 6:54 pm

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?

anishathomas
Posts: 35
Joined: Fri Sep 28, 2018 12:25 am

Re: wave property

Postby anishathomas » Thu Oct 18, 2018 7:07 pm

Yeah photon's have zero mass and therefore you can't use that equation. Instead, you use the momentum to figure out the wavelength.

Adriana_4H
Posts: 20
Joined: Fri Sep 28, 2018 12:29 am

Re: wave property

Postby Adriana_4H » Fri Oct 19, 2018 6:45 pm

What do you mean by resting mass?

Raymond Ko 1H
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

Re: wave property

Postby Raymond Ko 1H » Fri Oct 19, 2018 9:51 pm

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.

Austin Clack
Posts: 29
Joined: Fri Sep 28, 2018 12:17 am

Re: wave property

Postby Austin Clack » Sat Oct 20, 2018 1:11 pm

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?


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