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## Homework Statement

a) Use Planck’s radiation law to derive the Stefan-Boltzmann law for the case of zero background

temperature (i.e., T0 = 0).

## Homework Equations

http://csep10.phys.utk.edu/astr162/lect/light/plancklaw.gif

## The Attempt at a Solution

So I know we are suppose to integrate over all wavelength but I dont' know what should the limit be