Two bodies of differet metals A and B having an equal mass are given equal quantities of heat. Given that the molecular weight of A is greater than that of B, compare the specific heat capacities of the two metals. (Note that the rise in temperature is a measure of the increase in the average kinetic energy of the molecules.).

Two bodies of differet metals A and B having an equal mass are given e

1.	Two bodies of differet metals A and B having an equal mass are given equal quantities of heat. Given that the molecular weight of A is greater than that of B, compare the specific heat capacities of the two metals. (Note that the rise in temperature is a measure of the increase in the average kinetic energy of the molecules.).
Answer» Solution :Specific heat capacity is the AMOUNT of heat energy absorbed by a unit mass of substance when its temperature is INCREASED through 1K. Let A and B be two substances of unit masses. Let the molecular weight of A be GREATER than the molecular weight of B `(M_(A) gt M_(B))`. As the mass of A and B are EQUAL, the number of molecules o B is greater than the number of molecules of `A(n_(B) gt n_(A))`. When equal amount of heat energy is supplied to A and B,the kinetic energy per molecule of A is greater than that of B as the number of molecules of A is less than that of 'B'. that is the rise in temperature of A is greater than the rise in temperature of 'B'. THEREFORE, B can absorb more amount of heat energy at less temperature. So the specific heat capacity decreases as the molecular.