The total radiant energy per unit area, normal to the direction of incidence, received at a distance
Channel: Doubtnut
Date: 2020-01-19

The total radiant energy per unit area, normal to the direction of incidence, received at a distance `R` from the centre of a star of radius `r` whose outer surface radiates as a black body at a temperature `T K` is given by (where `sigma` is Stefan\'s constant)