Two walls of thickness in the ratio 1:3 and thermal conductivities in the ratio 3:2 form a composite wall of a building. If the free surfaces of the wall be at temperatures `30^@C` and `20^@C`, respectively, what is the temperature of the interface?

A wall consists of two layer, one of thickness 3 cm and other of 6 cm. the thermal conductivities of the materials of these layers are K and 3K respectively. The temperature of the outer surfaces of the two layers are -5^(@)C and 20^(@)C respectively. determine the temperature of the surface of contact of the two layers in the steady state.

A compound slab is made of two parallel plates of copper and brass of the same thickness and having thermal conductivities in the ratio 4:1 . The free face of copper is at 0^(@)C . The temperature of the internal is 20^(@)C . What is the temperature of the free face of brass?

The slab shown in the figure consists of two parallel layers of cooper anb brass of same thickness and having thermal conductivites in the ratio 4 : 1 . IF the free face of the brass is at 100^(@)C and that of copper is at 0^(@)C , then the temperature of the interface will be

The ratio of the masses of two liquids is 3:4 and of their specific heats is 2:3. They are at 60^(@)C and 30^(@)C respectively. What will be the final temperature if they are mixed?

Two plates of same area are placed in contact. Their thickness as well as thermal conductivities are in the ratio 2:3 . The outer surface of one plate is maintained at 10^(@) C and that of the other at 0^(@) C. What is the temperature at the common surface?

Two plates of same area are placed in contact. Their thickness as well as thermal conductivities are in the ratio 2:3 . The outer surface of one plate is maintained at 10^(@) C and that of the other at 0^(@) C. What is the temperature at the common surface?

Two walls of thickness d and d and thermal conductivities k and k are in contact. In the steady state, if the temperature at the outer T_(1) and T_(2) , the temperature at the common wall is

A slab consists of two parallel layers of copper and brass of the time thickness and having thermal conductivities in the ratio 1:4 . If the free face of brass is at 35^(@)C and that of copper at 1: sqrt(2.5) , the temperature of interface is