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The space between two hollow concentric spheres of radii 25m and 45m is under vacuum. Exchange of radiation occurs only between the outer surface (S1) of the small sphere and inner surface (S2) of the larger sphere. The fraction of radiation leaving S2 and reaches Si is a) 0.308 b) 0.41 c) 0.52 d) 0.61

The space between two hollow concentric spheres of radii 25m and 45m is under vacuum. Exchange of radiation occurs only between the outer surface (S1) of the small sphere and inner surface (S2) of the larger sphere. The fraction of radiation leaving S2 and reaches Si is a) 0.308 b) 0.41 c) 0.52 d) 0.61

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The space between two hollow concentric spheres of radii 25m and 45m is under vacuum. Exchange of radiation occurs only between the outer surface (S1) of the small sphere and inner surface (S2) of the larger sphere. The fraction of radiation leaving S2 and reaches Si is a) 0.308 b) 0.41 c) 0.52 d) 0.61
Transcribed Image Text:The space between two hollow concentric spheres of radii 25m and 45m is under vacuum. Exchange of radiation occurs only between the outer surface (S1) of the small sphere and inner surface (S2) of the larger sphere. The fraction of radiation leaving S2 and reaches Si is a) 0.308 b) 0.41 c) 0.52 d) 0.61
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