2007-08-01 06:14:43 · 3 answers · asked by LG 7 in Science & Mathematics ➔ Physics
I mean that I'm sure all protons have close to the same mass. But do we assume they're all exactly the same? Perhaps their are subtle variations. Are we ever able to determine the mass of individual protons or is it a statistical thing?
2007-08-01 13:09:31 · update #1
very high, but it also depends on their energy levels - relativity, e=mc^2
2007-08-01 06:36:52 · answer #1 · answered by throbbin 3 · 0⤊ 1⤋
For the example of the proton, see the reference, which says the mass of the proton is 1.672 621 71(29) Ã 10^â27 kg. The numbers before the parentheses are certain. The ones in parentheses are not.
To put it another way, science has never detected any difference in mass. The uncertainty is all due to the limits of our measurement technologies.
2007-08-02 03:47:01 · answer #2 · answered by Frank N 7 · 0⤊ 0⤋
I'm not sure what you're asking. They do not have the same mass just because we give them the same name. They have the same name because they have the same mass. And the same charge, and the same spin (plus and minus).
If two particles are of different mass, then you can be pretty sure they are not the same particle and we're not going to give them the same name.
Did I answer your question, or did I miss your meaning completely?!?
2007-08-01 18:04:46 · answer #3 · answered by ╡_¥ôò.Hóö_╟ 3 · 0⤊ 0⤋