1.

What is the value of grey body factor for concentric cylinders?

A. 3/ [1 – e 1/e 1 + 1 + 1 – e 2/e 2 (A 1/A 2)].
B. 4/ [1 – e 1/e 1 + 1 + 1 – e 2/e 2 (A 1/A 2)].
C. 1/ [1 – e 1/e 1 + 1 + 1 – e 2/e 2 (A 1/A 2)].
D. 2/ [1 – e 1/e 1 + 1 + 1 – e 2/e 2 (A 1/A 2)].
Answer» D. 2/ [1 – e 1/e 1 + 1 + 1 – e 2/e 2 (A 1/A 2)].


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