Photons

$c=\lambda v$

Philip
Posts: 100
Joined: Sat Sep 07, 2019 12:16 am

Photons

Do photons have mass?

Julie_Reyes1B
Posts: 105
Joined: Sat Jul 20, 2019 12:16 am

Re: Photons

Hi!
In short, photons (light particles) are considered massless. They have energy and momentum, but no measurable mass. This was determined experimentally. Here is a really interesting article that goes into depth about some of the findings:
http://www.desy.de/user/projects/Physic ... _mass.html

Hope this helps!

Eva Zhao 4I
Posts: 101
Joined: Sun Sep 29, 2019 12:16 am

Re: Photons

Hello! Just to add on a little more information, certain energy formulas will not work for photons due to photons having zero mass. E=mc^2, for example, will not work for the photon as it would for an electron; photons have energy, yet the formula E=mc^2 would result in an answer of 0 J for the photon if used.

Doreen Liu 4D
Posts: 54
Joined: Wed Sep 11, 2019 12:17 am

Re: Photons

No, photons do not have a mass. They do have energy and momentum, but no mass.