What is the size of this energy gap?

Well, if it takes if we know, how much energy it takes to get,

to remove the electron from here.

And we know, how much energy it takes to remove the energy from here,

if we were to subtract those two,

we would know the difference in energy of this transition between those two.

So this is going to be equal to and, and electron is relaxing down,

so the change in energy is actually going to be final minus initial,

so it'll be 2.09 times 10 to the minus 19 joules,

minus 6.84, times 10 to the minus 19 joules.

And that is equal to 4.75 times 10 to the minus 19 joules.

So that's a change in energy of the electron, as it goes from this to this.

Well, that has to equal the energy of the photon.

It has exactly, the same energy.

Only the energy of the photon is the, by the way that's negative,

is going to be the absolute value of energy differences of the electron.

'Kay?

because the electron is changing in energy,

a photon has to have a positive value.

So the energy of the photon is 4.75 times 10 to the minus 19 joules.

Well, if we know the energy of the photon.