## 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)

isotropic radiation

##### You should know about

1) the definition about the energy density and the emissive power 2) the volume integration about spherical coordinates

##### Solution