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 is Stefan's constant)
(Where is Stefan's constant)
As we have leaqrned @2747
Power of radiation
Intensity of this energy at a distance R is
Option 1)
Option 2)
Option 3)
Option 4)
(Where is Stefan's constant)