Two circular disc `A` and `B` with equal radii are blackened. They are heated to same temperature and are cooled under identical conditions. What inference do your draw from their cooling curves?

Options

A. A and B have same specific heats
B. specific heat of A is less
C. Specific heat of B is less
D. Nothing can be said

Answer

B

Explanation

According to Newton's law of cooling rate of cooling is given by `((-dT)/(dt))=(eA sigma)/(mc)(T^(4)-T_(0)^(4))`
Where C is specific heat of material or `((-dT)/(dt)) prop 1/c`
i.e., rate of cooling varies inversely as specific heat, from the graph, for A rate of cooling is larger. therefore, specific heat of A is smaller.