Two spheres of same material and radii 4 m and 1 m at temperature 1000 K and 2000 K . Find the ratio of the energies radiated by them in one second .

Question

$(a)\;1:1 \qquad(b)\;1 : 2\qquad(c)\; 1 : 4\qquad(d)\;4 : 1$