The significance of each term in Planck's Radiation Formula

[kmiller3401]

Homework Statement

I(λ, T) is 4 pieces multiplied: (8π/λ⁴) (hc/λ) (1/(e^hc/λkT-1) (c/4).

1. Identify the meaning of each term.
2. Which term(s) fix the ultraviolet catastrophe?

The Attempt at a Solution

Well I know that the energy of a photon is given by (hc/λ), and I'm fairly certain it was Planck who introduced the e^hc/λkT-1 term to reconcile the ultraviolet catastrophe, but that's about it. I've been looking through Planck's derivation and I am quite overwhelmed by the statistical analysis required.

 

[mfb]

Well, you identified two out of four terms. One is just a constant.
You have the probability that state is occupied and you have the energy of a photon in this state, but what about the "number" of states?