Specific heat — UPSC Physics Optional CSE 2026 Paper II

At very low temperatures, the specific heat of rock salt varies with temperature according to the Debye T^3 law. The Debye temperature for rock salt is 281\text{ K}. How much heat will be required to raise the temperature of 2\text{ kilo-mol} of rock salt from 10\text{ K} to 50\text{ K}?