Physics

Problem

A square metallic sheet of side

20\,\text{cm}

is held at

500\,\text{K}

. Its surface has an emissivity of

0.6

. Determine the rate at which it radiates energy. (

\sigma = 5.67 \times 10^{-8}\,\text{W m}^{-2}\,\text{K}^{-4}

)