Two identical square plates

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

Problem

Two identical square plates, each of area

0.20\,\text{m}^2

, are maintained at

500\,\text{K}

. Plate A has emissivity

0.80

, whereas Plate B has emissivity

0.20

. Neglecting all losses other than radiation, what is the ratio (A:B) of their total power radiated? (a)

1

(b)

\dfrac{1}{4}

(c)

4

(d)

2