Consider two walls, 1 and 2, both have the same surface area and the same temperature drop across their thickness. The ratio of the thermal conductivity between two walls is given as k1/k2 = 2. The thickness ratio between the two walls is given as L1/L2 = 4. Then the ratio of the heat transfer rate between the two walls Q1/Q2 will be
1
0.5
2
1
3
2
4
4