Out of 100 kcal second of incident radiant energy on the...

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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

Answer: Option B

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