4267Chemical EngineeringMedium
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________?
A0.45
B0.85
C0.55
D0.35
Correct answer
A. 0.45
Explanation
The correct answer is 0.45.