A very thin metallic shell of radius r is heated to temperature T and then allowed to cool. The rate of cooling of shell is proportional to

A hot metallic sphere of radius r radiates heat. It's rate of cooling is

According to ‘Newton’s Law of cooling’, the rate of cooling of a body is proportional to the

According to ‘Newton’s Law of cooling’, the rate of cooling of a body is proportional to the

Two balls of same material and finish have their diameters in the ratio 2:1. Both are heated to the same temperature and allowed to cool by radiation. Rate of cooling of big ball as compared to smaller one will be in the ratio:

Radius of a shere is R density is d and specific heat is s, Is is heated and then allowed to cool Its rate of decrease of temperature will be proportional to .