Recent content by Grim Shady

It was in the definition of momentum itself, I've found the answer the answer anyway in the de Broglie wavelength equation, which is something I knew already was just having trouble remembering it. Cheers for the help people.

But you can't just ignore the equation for momentum and state that light has a momentum, p, purely for convenience. Unless momentum can be defined as something else, other than the equation I posted.

Yeah sorry my mistake, but that still would mean that p is an undefined value, despite it being in the equation George posted.

But surely if p = m0v/sqrt(1-v2/c2), that would make p equal to 0?

I was reading the derivation of this equation on hyperphysics.com and after searching all over the internet it seems that eveywhere seems to just accept this equation is valid for light, even though a rest mass of 0 would make p equal to 0. Sorry if I'm being stupid or if this has been asked...