139 A black metal foil is warmed by radiation from a small

Last updated: 6/9/2023

139 A black metal foil is warmed by radiation from a small sphere at temperature T and at a distance d where surrounding temperature is T It is found that the power received by the foil is P If both the temperature and the distance are doubled the power received by the foil will be Assume T Tol 1 16P 2 4P