Photon Mass?

R.G. Walters mbrgw at
Fri Sep 9 08:32:12 EST 1994

In article <sib-0809941303350001 at> sib at (Sam Beale) writes:
>In article <f_holleyg-080994084705 at>,
>> Does a photon have mass or is it just an energy wave?
>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.

But they DO have momentum.  Again, consult a physics book :-)

Robin Walters.                      Robert Hill Institute, Sheffield UK.

A fact is an opinion that everyone agrees with.

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