Two long parallel surfaces each of emissivity 0.7 are maintained at different te

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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 . Two

B . Three

C . Four

D . One

Answer: Option B

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