List of practice Questions

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities $K$ and $2\, K,$ respectively. The equivalent thermal conductivity of the slab is

For a black body at temperature $727^{\circ}C$, its radiating power is 60 watt and temperature of surrounding is $227^{\circ}C$. If temperature of black body is changed to $1227^{\circ}C$ then its radiating power will be:

The Wien's displacement law express relation between

Consider two rods of same length and different specific heats $ (S_1, S_2) $ , conductivities $ (K_1, K_2)$ and area of cross-sections $ (A_1 , A_2) $ and both having temperatures $ T_1$ and $T_2 $ at their ends. If rate of loss of heat due to conduction is equal, then :-