Thanks for the reply. It's certainly not. The Stefan-Boltzmann constant comes from the integration, right? No, it doesn't say I need to derive it from Planck's law. However, I don't see how to integrate it without the substitution.
Homework Statement
The unit area intensity of radiation from the Sun at the photosphere is 6.33*107 W/m2.
a) Check this value using the calculus of the Stefan-Boltzman Law, assuming the Sun is a blackbody emitter (\epsilon = 1) with a surface temperature of 5777K.
Homework Equations...