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Question: a spherical container of 1 m dia storing liquid nitrogen...

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A spherical container of 1 m dia storing liquid nitrogen at – 120°C is covered by high reflecting coating with reflectivity of 0.96. If it is exposed to surroundings at 20°C, determine the heat flow in due to radiation. If a concentric spherical surface with equal reflectivity on either side of 0.96 and a diameter of 1.2 m is used over the surface, determine the reduction in the heat flow by radiation, when exposed to the same surroundings.

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