The sun delivers `10^3W//m^2` of electromagnetic flux to the earth's surface, which is at a distance of `1.5xx10^(11)m` from the sun. The whole incident electromagnetic flux is absorbed by the earth.
The total electromagnetic power of the sun is

The sun delivers 10^3W//m^2 of electromagnetic flux to the earth's surface, which is at a distance of 1.5xx10^(11)m from the sun. The whole incident electromagnetic flux is absorbed by the earth. Total electromagnetic power that is incident on a roof of dimensions (8mx10m) on the surface of earth is