# Assuming the sun to be a spherical body of radius R at a temperature of T K, evaluate the total radiant power, incident on Earth, at a distance r from the Sun. ?

$\frac{\pi ro^{{2}}}{4\pi r^{2}}(\sigma T^{4}4\pi R^{2})$
$\frac{\pi ro^{{2}}}{r^{2}}(\sigma T^{4}R^{2})$