[Jack Simth]

Originally posted by Slick:
By the way, photons have mass? I haven't even begun to tear apart your lack of knowledge of physics. If they have mass, how do they travel at the speed of light? The relativistic mass is given by the formula:

m = m0 / [(1-v^2/c^2)^(1/2)]

As v approaches c, m goes to infinity. It is impossible for an infinitely massive object to move at all much less at the speed of light. So what is the exact value of the mass of a photon (pick any wavelength you want)??? Again, please be precice.

Slick.

First off, m0 is the rest mass; photons have 0 rest mass (they don't exist at rest). The equation then becomes. However, energy has mass, and photons have energy. If you do he energy mass conVersion, the result is a constant * the frequency of the photon. I don't remember exactly, but it was something like m = y * h/(2*pi) where m is the mass, y is the frequency and h is plank's constant. I could have the formula off a bit, but that's what is in my memory from my Last physics class.