- #1

- 12

- 0

do the photons have mas???or just the momentum???or both??

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- Thread starter mysteriously
- Start date

- #1

- 12

- 0

do the photons have mas???or just the momentum???or both??

- #2

tom.stoer

Science Advisor

- 5,766

- 162

Photons have zero rest mass m=0. So the equation

E² = (mc²)² + (pc)²

relating energy E, rest mass m and momentum p reduces to

E = pc

Using Planck's constant h the energy E can be written in terms of frequency f as

E = hf

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