Two identical vessels, made of different materials having conductivites `K_(1)` and `K_(2)` are completely filled with ice at `0^(@)C`. Due to temperature of surrounding, the ice in the two vessels melts in `25min` and `20min` respectively. The ratio of `K_(1)` and `K_(2)` is

Two identical rods are made of different materials whose thermal conductivities are K_(1) and K_(2) . They are placed end to end between two heat reservoirs at temperatures theta_(1) and theta_(2) . The temperature of the junction of the rod is

Two identical rods are made of different materials whose thermal conductivities are K_(1) and K_(2) . They are placed end to end between two heat reservoirs at temperatures theta_(1) and theta_(2) . The temperature of the junction of the rod is

A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities K_(1) and K_(2) . The equivalent conductivity of the combination is

Two vessels 1 and 2, made out of different materials are identical in all the geometrical aspects. In both the vessel the same quantity of ice gets melted in 20 min and 30 min respectively. The ratio of the thermal conductivity of the second one to that of the first is

Two vessels 1 and 2, made out of different materials are identical in all the geometrical aspects. In both the vessel the same quantity of ice gets melted in 20 min and 30 min respectively. The ratio of the thermal conductivity of the second one to that of the first is

Two beakers, identical in all respects, but made of different materials, are filled with equal amounts of ice at 0^(@) C . Toe ice in one beaker melts in one minute whereas that in the other beaker melts in five minutes. Find the ratio of the thermal conductivities of the material of the two beakers.

Two closed containers of same dimensions made of different materials are completely filled with ice. The ice in the first container takes 20 minutes and that in the second container takes 10 minutes, respectively for complete melting. The ratio of the thermal conductivities of the materials of the two containers is _______

A slab consists of two layers of different materials of the same thickness and having thermal conductivities K_(1) and K_(2) . The equivalent thermal conductivity of the slab is