Two different metal rods of equal lengths and equal areas of cross-section have their ends kept at the same temperatures θ1 and θ1 If k1 and k2 are their thermal conductivities, ρ1 and ρ2 their densities and s1 and s2 their specific heats, then the rate of flow of heat in the two rods will be the same if
The correct choice is (d).