Q. 58 Two infinite parallel plates are placed at a certain distance apart. An infinite
radiation shield is inserted between the plates without touching any of them to
reduce heat exchange between the plates. Assume that the emissivities of plates
and radiation shield are equal. The ratio of the net heat exchange between the
plates with and without the shield is
(A) 1/2
(B) 1/3
(C) 1/4
(D) 1/8
Answer: (A)
Explanation:
