A thin metal plate of 4 cm diameter is suspended in atmospheric air wh – McqOptions

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1.	A thin metal plate of 4 cm diameter is suspended in atmospheric air whose temperature is 290 K. This plate attains a temperature of 295 K when one of its face receives radiant energy from a heat source at the rate of 2 W. If heat transfer coefficient on both surfaces of the plate is stated to be 87.5 W/m² K, workout the reflectivity of the plate
A.	0.35
B.	0.45
C.	0.55
D.	0.65
Answer» C. 0.55

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