Four spheres A, B, C and D of different metals but of same radius and same surface finish are kept at same temperature. The ratio of their densities and specific heats are 2 : 3 : 5 : 1 and 3 : 6 : 2 : 4. Which sphere will show the fastest rate of cooling (initially)

Four spheres A, B, C and D of different metals but of same radius and

1.	Four spheres A, B, C and D of different metals but of same radius and same surface finish are kept at same temperature. The ratio of their densities and specific heats are 2 : 3 : 5 : 1 and 3 : 6 : 2 : 4. Which sphere will show the fastest rate of cooling (initially)
Answer» A B C D Solution :Since, radius or volume of all the four spheres are equal, the ratio of their MASSES will be 2 : 3 : 5 : 1. Heat capacity = (MASS) (SPECIFIC heat) `therefore` Ratio of heat capacities will be 6 : 18 : 10 : 4. The sphere having the minimum heat capacity will show the fastest rate of cooling. `therefore` correct OPTION is (4)