00:01
For this problem on the topic of nuclear physics, we want to find the binding energy per nucleon for the plutonium isotope, plutonium 239.
00:09
We are given the mass of the neutral atom.
00:11
So the binding energy, delta e, b e, is equal to the number of proton z times the mass of a proton plus the number of neutrons a minus z times the mass of a neutron.
00:30
Minus the mass of the neutral atom, which in this case is plutonium, and we multiply that by c squared.
00:40
Now, in principle, nuclear masses should be used, but the mass of the z electrons included in the first term is cancelled by the mass of the z electrons included in the last term.
00:51
So the result is the same...