An ideal monoatomic gas is taken round the cycle ABCDA as shown in the p-diagram

The work done during the cycle is

Which of the following graphs show the correct relation between conductivity and temperature for a metallic conductor?

The ratio of the specific heats $${{{C_v}} \over {{C_p}}} = {1 \over \gamma }$$ in terms of degrees of freedom (n) is given by

A black body radiates energy at the rate E Wm^$$-$$2 at high temperature TK. When the temperature is reduced to $$\left( {{T \over 4}} \right)$$ K, the new radiant energy is