Recent content by swle

Thank-you andrien, that is a really interesting link - who is Kevin Brown?

Thanks very much for the reply, but I have a problem with this line Are you not arguing a flux here? (i.e. Gauss ) What happens to the photons once they have reached a destination? While individual photons will be absorbed, won't the total number available will remain constant? Sorry if...

You got me! I chose numbers that, although widely available in the public domain, gave the me answer that I wanted. btw, great links - thanks

Do photons obey the 1/r^2 gravity law? This was a question that came up in our recent PhySoc meeting and no-one present seemed to know the answer (lecturers included!) Does anyone have a unequivocal answer (and preferably citing a source)? I have done a quick search through old posts...

Thanks for reply! It was just a bit of fun - I realize that most objections will centre around what is, or what is not, "rest mass". I took the view that if someone is prepared to quote a figure, then I am prepared to put it into a calculation!

Brilliant - thanks!

Thank-you for taking time to reply! Like I said, just a bit of fun! I don't follow that argument - perhaps you cold explain? I don't follow this argument either, perhaps you can explain this one too? The universe may well be fractally distributed, but as far as we know it is isotropic...

Sorry that this is a bit late, but is Z a real number? If not then you could use Cauchy: non-holomorphic points will be at z^2 = - x^2 ( e.g. x =1, z = i).

Hello This is my first post here. Although I've often read posts in Physics Forums, I've never actually contributed anything - so here goes! I always enjoy a good hand-waving argument on orders of magnitude; when I first started my astrophysics degree, one homework question was "estimate...