00:01
Okay, so first of all, we know that the energy for a hydrogen atom are given by the equation en equals minus 13 .6, there multiplies z squared divided by n square.
00:23
So we know that in this problem, on hydrogen atom, the electron, is in the first excited state.
00:32
So we can say he is in e2.
00:38
Then he receives energy of 2 .86 electron volts.
00:50
And we want to discover what is the quantum number n that he moves on.
00:58
So first of all, let's look to this equation in here.
01:05
We know that e equals 2 is just minus 13 .6.
01:15
They multiplies the z for the hydrogen atom, which is 1 square, divided by the quantum number...