A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be

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 ?