Photon Mass?

Sam Beale sib at brown.edu
Thu Sep 8 12:06:13 EST 1994


In article <f_holleyg-080994084705 at holley.sfasu.edu>,
f_holleyg at titan.sfasu.edu (Gordon Holley) wrote:

> Hi there,
> 
> IÕm in a graduate tree physiology course and I ran into a question that no
> one 
> had an answer to.  We had a brief refresher on photosynthesis (at a very
> basic 
> level), and while we were discussing how the energy of photons was 
> transferred, I remembered something about a controversy as to whether or 
> not a photon contained mass.  So my question is: Does a photon have mass or
> is 
> it just an energy wave?
> 
> Thanks for any answers I get.
> 
> Gordo
> 
> ----------------
> Sig on backorder.

No mass, all energy.  They travel at the speed of light.  This alone
disqualifies them from having mass.  Said another way, if they had mass
and travelled at the speed of light, they would have infinite energy. 
Consult any physics book.



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