The ratio of the areas of cross-section of two rods of different materials is 1:2, and the ratio of the thermal conductivities of their materials is 4:3. On keeping equal temperature-difference between the ends of these rods, the rate of conduction of heat are equal. Determine the ratio of the lengths of the rods.

The ratio of the areas of cross-section of two rods of different mater

1.	The ratio of the areas of cross-section of two rods of different materials is 1:2, and the ratio of the thermal conductivities of their materials is 4:3. On keeping equal temperature-difference between the ends of these rods, the rate of conduction of heat are equal. Determine the ratio of the lengths of the rods.
Answer» ANSWER :`2:3`