Mechanical Engineering > GATE 2014 SET-3 > Heat Transfer
A solid sphere of radius r1 = 20 mm is placed concentrically inside a hollow sphere of radius r2 = 30 mm as shown in the figure. The view factor F21 for radiation heat transfer is
A
2/3
B
4/9
C
8/27
D
9/4

Explanation

Correct : b

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