A hemispherical furnace of radius 1.0 m has a roof temperature of T1 = – McqOptions

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1.	A hemispherical furnace of radius 1.0 m has a roof temperature of T1 = 800 K and emissivity e1 = 0.8. The flat floor of the furnace has a temperature T2 = 600 K and emissivity e2 = 0.5. The view factor F12 from surface 1 to 2 will be
A.	0.3
B.	0.4
C.	0.5
D.	0.6
Answer» D. 0.6

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