/sci/ - Science & Math

How does mass change during beta decay? Anonymous Thu Jun 14 09:51:39 2018 No.9809200 [View]
File: 45 KB, 821x869, 1510158230500.jpg [View same] [iqdb] [saucenao] [google]

I know this is probably a super brainlet question, but whenever I try to calculate the mass after beta decay I mess up.

Say I have hypothetical nucleus with the mass 20000MeV. It goes through beta decay and gives off an electron with the maximum kinetic energy of 2MeV. The mass of the new nucleus should be 20000 - 2 - 0,511 (mass of an electron) MeV = 19997,489 MeV.

My textbook says you should only subtract the 2MeV of kinetic energy. Why shouldn't you also subtract the mass of the electron? The original nucleus loses an electron as well as the other energy, right? Please help a brainlet out.

>>	Anonymous Sun Dec 17 11:33:02 2017 No.9374578 [View] File: 45 KB, 821x869, 1510158230500.jpg [View same] [iqdb] [saucenao] [google] >>9374228 I am grow upp fren

>>	Anonymous Fri Nov 10 17:07:35 2017 No.9288012 [View] File: 45 KB, 821x869, 1510158230500.jpg [View same] [iqdb] [saucenao] [google] >>9287980 >distrubitions no bully plz.

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