Physics

Problem

A square metal plate of side length

20\,\text{cm}

is maintained at

450\,\text{K}

. Its surface has an emissivity of

0.85

. Using

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

, calculate the total radiant power emitted by one face of the plate.