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chemical engineering heat transfer
1. Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be
(A): 0.35
(B): 0.45
(C): 0.55
(D): 0.85
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