The temperature drop through each layer of a two layer furnace wall is shown in figure. Assume that the external temperature $T_1$ and $T_3$ are maintained constant and $T_1 > T_3$. If the thickness of the layers $x_1$ and $x_2$ are the same, which of the following statements are correct.
The temperature drop through each layer of a two layer furnace wall is shown in figure. Assume that the external temperature $T_1$ and $T_3$ are maintained constant and $T_1 > T_3$. If the thickness of the layers $x_1$ and $x_2$ are the same, which of the following statements are correct.
- A
$k_1 > k_2$
- B
$k_1 < k_2$
- C
$k_1 = k_2$ but heat flow through material $(1)$ is larger then through $(2)$
- D
$k_1 = k_2$ but heat flow through material $(1)$ is less than that through $(2)$
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