A cavity behaves like a perfect blackbody and emits through an opening of area when…

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

A cavity behaves like a perfect blackbody and emits

200\,\text{W}

through an opening of area

2.0\,\text{cm}^2

when its temperature is

1200\,\text{K}

. The opening is then covered with a thin plate whose emissivity is

0.50

, but the system must still emit

200\,\text{W}

through the same area. Calculate the temperature to which the cavity must now be raised.