Two metallic spheres
S1 and
S2 are made of the same material and have identical surface finish. The mass of
S1 is three times that to
S2. Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but area thermally insulated from each other. The ratio of the initial rate of cooling of
S1 to that
S2 is?a.
1/3b.
1/31/3c.
3−1/2d.
31/2