List I (Surfaces with orientations) | List-II (Equivalent Emissivity) | ||
A. | Infinite parallel planes | 1. | \[{{\in }_{1}}\] |
B. | Body 1 completely enclosed by body 2 but body 1 is very small | 2. | \[\frac{1}{\frac{1}{{{\in }_{1}}}+\frac{1}{{{\in }_{2}}}-1}\] |
C. | Radiation exchange between two small gray bodies | 3. | \[\frac{1}{\frac{1}{{{\in }_{1}}}+\left( \frac{{{A}_{1}}}{{{A}_{2}}} \right)\left( \frac{1}{{{\in }_{2}}}-1 \right)}\] |
D. | Two concentric cylinders with large lengths | 4. | \[{{\in }_{1}}.{{\in }_{2}}\] |
A) A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2
B) A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3
C) A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3
D) A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2
Correct Answer: C
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