00:02
So in this question, you look at beta decay of this strontium element, right? so i'll write this strontium like this.
00:11
It has charged 38, atomic number 90.
00:18
So it undergoes a beta decay, actually.
00:22
So in the case of beta decay, the element will emit an electron plus an antineutrina of the electron, right? and they obviously, this element, the element, it's mutated in two, becomes i would just call it a, okay? and we have a charge in 39 and a same atomic number, right? you can look up the chemical tab to find what this element should be, but it doesn't really bother us.
00:57
Suppose the master of this, element, i call it m, and the mass of this element, i call it m prime.
01:07
Okay.
01:09
And you know that the energy released, which are taken away basically by these two particles, the electron on the neutrina, is basically the energy together, i mean, taking away by these two products together, it's basically given by m minus m prime, ponds c squared...