41 - Radiation

The radiation energy emitted by a blackbody at any absolute temperature \(T\), over all wavelengths per unit unit time per unit area is obtained by integrating the Planck’s distribution law from \(\lambda=0\) to \(\lambda=\infty\), and given as \[\boxed{E_b(T) = \sigma T^4 \qquad \text{W/m$^2$}}\] where