Do the photons have mass?

  • #1
do the photons have mas???or just the momentum???or both??
 

Answers and Replies

  • #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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