A 40 cm diameter disk with an emissivity of 0.65 is placed in a large – McqOptions

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1.	A 40 cm diameter disk with an emissivity of 0.65 is placed in a large enclosure at 30°C and is effectively a black body. If the disc has a temperature of 55°C, calculate the radiosity of its upper surface.
A.	604 W/m2
B.	594 W/m2
C.	560 W/m2
D.	749 W/m2
Answer» C. 560 W/m2

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