A body of surface are `15xx10^(-3)m^2` emits 0.3 kcal in 40 second at  a temperature `70^(@
Channel: Doubtnut
Date: 2020-05-24

A body of surface are `15xx10^(-3)m^2` emits 0.3 kcal in 40 second at  a temperature `70^(@)C`. The emissive power of the surface at that temperature is