Gasiorowicz, Quantum Physics, 3rd Edition
Chapter 01. The Emergence of Quantum Physics
Problem 01. The relation between energy density and emissivity
The problem asks you to
prove the relation between the energy density in a cavity and the emissive power (Equation 1-1).
The problem provides (assumes)
You should know about
1) the definition about the energy density and the emissive power 2) the volume integration about spherical coordinates