Two long parallel surf

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Question

Two long parallel surfaces each of emissivity 0.7 are maintained at
different temperatures and accordingly have radiation heat exchange
between them. It is desired to reduce 75% of the radiant heat transfer
by inserting thin parallel shields of emissivity 1 on both sides. The
number of shields should be

Options:

A . one

B . two

C . three

D . four

Answer: Option C

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