The net radiation from the surfaces of two parallel plates of emissivity 0.7 each maintained between...

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The net radiation from the surfaces of two parallel plates of emissivity 0.7 each maintained between two temperatures T₁ and T2 is to be reduced by 85 times by using radiation shields of emissivity 0.05 in between plates. The number of shields required is (a) 2 (b) 3 (c) 4 (d) 5 The net radiation from the surfaces of two parallel plates of emissivity 0.7 each maintained between two temperatures T₁ and T2 is to be reduced by 85 times by using radiation shields of emissivity 0.05 in between plates. The number of shields required is (a) 2 (b) 3 (c) 4 (d) 5

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