00:01
So this problem asks about beta decay and asks, what's the maximum kinetic energy of an electron emitted in the beta decay? so basically we have the neutron.
00:11
For beta decay, we have the neutron going into a proton plus an electron and a neutrino.
00:16
And so by energy conservation, or i guess you could say like maybe the best case for the electron if it wants to have the most energy, is that everything else has no kinetic energy except for the electron.
00:32
And so in that case, then, yeah, all the kinetic energy goes to the electron, none to the neutrino, not to the proton.
00:41
And so that maximum energy is just the mass difference between the neutrino or excuse me, between the neutron and the proton since it's believed that the neutrino mass is non -existent or small.
00:53
So must all kind of by energy conservation go to the electron.
00:57
And then that's just going to be the mass difference.
00:59
And then that amount of energy is just a mass difference between a neutron and a proton.
01:04
So just from the lookup table, you want to subdue 938 .78.
01:13
Oops, this thing is on an angle.
01:17
Sorry for that...