The condition under which a microwave oven heats up a food item containing water molecules most efficiently is:

At very low temperatures, the heat capacity $$\text{C}_\text{V}$$​ of a solid is:

​A copper block of mass 3 kg is heated in a furnace to a temperature of 450 °C and then placed on a large ice block. Find the maximum amount of ice that can melt? (specific heat of copper = 0.39 $$\text{Jg}^{-1}\text{K}^{-1}$$​, heat of fusion of water = 335 $$\text{Jg}^{-1}\text{K}^{-1}$$​)​

Which of the following statements is INCORRECT for heat ?