A square plate of area is maintained at

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

A square plate of area

1.0\,\text{m}^{2}

is maintained at

500\,\text{K}

. One half of the plate is coated with lamp-black paint

(\varepsilon = 1)

and the other half is polished metal

(\varepsilon = 0.20)

. Calculate the total power radiated by the plate. (

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

) (a)

4.4\,\text{kW}

(b)

1.1\,\text{kW}

(c)

2.1\,\text{kW}

(d)

3.5\,\text{kW}