A radiator in a domestic heating system operates at a surface temperature of $$55^\circ C$$. Assuming the radiator behaves as a black body, the rate at which it emits the radiant heat per unit area is (assume $$\sigma = 5.67 \times 10^{-8} W/(m^2 K^4)$$)

A

0.66 kW/m$$^2$$

B

0.0005 kW/m$$^2$$

C

0.5 kW/m$$^2$$

D

66 kW/m$$^2$$