A solid cylinder and a sphere of same material are suspended in a room turn by turn, after heating them to the same temperature. The cylinder and the sphere have same radius and same surface area.
(a) Find the ratio of initial rate of cooling of the sphere to that of the cylinder.
(b) Will the ratio change if both the sphere and the cylinder are painted with a thin layer of lamp black?

Answer

(a) `(3)/(4)` (b) No