# Derive Stefan-Boltzmann law from Wien’s law.

1. Sep 8, 2014

### Tirain

1. The problem statement, all variables and given/known data
Derive Stefan-Boltzmann law from Wien’s law

Hint: you can use (without proof) R(T) = -∞∫∞ R(λ,T)dλ , ρ(λ,T)=(4/c)*R(λ,T)

2. Relevant equations

wien's law: p(λ,T) = f(λ,T)/^5
Stefan's law : R(T) = σT^4

3. The attempt at a solution
Honestly I am having trouble just starting this problem. I know I would be able to work it out if I knew where to begin.

2. Sep 8, 2014

3. Sep 8, 2014

Oh thanks!

4. Sep 8, 2014

### nrqed

Well, the first step is: what is the function $f(\lambda,T)$ ?