Assuming the sun to have a spherical outer surface of radius `r` radiating like a black body at
Channel: Doubtnut
Date: 2020-01-19

Assuming the sun to have a spherical outer surface of radius `r` radiating like a black body at temperature `t^(@)C`. The power received by a unit surface (normal to the incident rays) at a distance `R` from the centre of the sun is where `sigma` is the Stefan\'s constant.