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# how do u work out the mass of a proton? watch

1. dudes, do u need to knwo the mass of a proton. is there any way of working it out?
2. Its more or less the same as 1 U (unified mass unit? Cant exactly remember what it actualy stands for). The value of U is given in the back of the paper usualy.
3. t'is given in formulae book
4. i've never known you to have to work it out - and i don't know of a theoretical way of doing it - it has the value 1.67x10-27 Kg. however, i've seen papers expect you to know things like the mass of the earth... yeah, like that's got a file in the ol' noggin! at least that's calculable though, oh wait... yep, you need to know the radius to do that... stupid edexcel... grrrr
5. God bless the AQA data sheet with it's multidute of equations constants and units...
6. (Original post by KAYS)
dudes, do u need to knwo the mass of a proton. is there any way of working it out?
You just need to know the following,

1amu = 1/12 Mass Of Carbon-12 = 934MeV = 934 x 106 x 1.6x10-19 J

And so the mass is calculated using e=mc² with the above.

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