Physics

Problem

A perfectly black disc of area

0.12\,\text{m}^2

radiates

1.5\,\text{kW}

of power steadily. Calculate its surface temperature in

^{\circ}\text{C}

. Assume

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