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Postby Philip » Sun Oct 13, 2019 11:18 pm

Do photons have mass?

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Joined: Sat Jul 20, 2019 12:16 am

Re: Photons

Postby Julie_Reyes1B » Sun Oct 13, 2019 11:21 pm

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: ... _mass.html

Hope this helps!

Eva Zhao 4I
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Re: Photons

Postby Eva Zhao 4I » Wed Oct 23, 2019 9:55 am

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

Postby Doreen Liu 4D » Wed Oct 23, 2019 11:05 am

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

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