Originally posted by Mild mannered
@Oct 26 2004, 09:15 AM
Lastly - I was imagining a particle sitting in space - motionless to a given frame of reference- it is spitting out radiation because it is a highly radioactive particle. Would it not move about? (equal and opposite forces) or does the radiation come out so evenly that it stays motionless
If a particle is highly radioactive, you are either talking about an atomic nucleus, or a fundamental particle with a half-life. In either case, when it gives off some kind of radiation, whether it be gamma-rays, electrons&neutrinos, neutrons, alpha particles, or something else, there will be a recoil. Momentum is conserved. When this happens, the particle is changed, and is perhaps less radio-active, or not radioactive at all.
In any case, the gravitational attraction that a single Uranium nucleus has is *very* small, and can for most purposes be discounted altogether.
While there are some ways that light and gravity can be compared, there doesn't, at the moment, seem to be a practical way to say that they are two parts of the same thing, unless that thing is everything-in-the-universe.
Forming opinions as we speak