Quote:
Originally posted by Lebell
To pick a nit, photons don't have mass, relativistic or otherwise.
What they do have is momentum, which comes from the fact that the momentum acutually has a small speed component in addition to the well known mass component.
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That's pretty much what relativistic mass is...
http://www.physlink.com/Education/AskExperts/ae180.cfm
http://www.ibiblio.org/lunar/school/.../massphot.html
You can argue all you like about relativistic mass not being "real", but you won't find me disagreeing with you.
Either way, by virtue of the definition of relativistic mass, you can assign such a value to a photon.