00:01
So let's say we have two energy levels and the difference between them is 0 .1 electron volts.
00:05
And they're in equilibrium.
00:08
Or sorry, a system is in equilibrium with a thermal reservoir at 600 kelvin.
00:14
So we want to find the probability that the system is in the higher energy level.
00:18
And so this we'll just call p, i suppose.
00:21
This is just going to be e to the minus beta delta e.
00:28
So let's say we have two, or well let me complete this expression, but let's write it a little bit differently.
00:32
So let's take the second one, the second level to be e2.
00:36
So the probability should look like this.
00:41
And then if we divide out by e to the beta e2, what we'll have is 1 over 1 plus e to the minus beta delta e...