A hemispherical infrared lamp dome made of glass with emissivity must radiate when…

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

Problem

A hemispherical infrared lamp dome made of glass with emissivity

0.60

must radiate

850\,\text{W}

when its surface temperature is

900\,\text{K}

. Assuming uniform temperature, what radius of the dome is required? (a)

11\,\text{cm}

(b)

5.5\,\text{cm}

(c)

7.8\,\text{cm}

(d)

4.6\,\text{cm}