Physics

Problem

A furnace wall is held at a uniform temperature of

1200\,\text{K}

and has an emissivity of

0.70

. What total surface area is required for the wall to radiate

2.5\times10^{5}\,\text{W}

of thermal power? Use

\sigma = 5.67\times10^{-8}\,\text{W\,m}^{-2}\text{K}^{-4}