A blind cylindrical hole of 2 cm diameter and 3 cm length is drilled i – McqOptions

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1.	A blind cylindrical hole of 2 cm diameter and 3 cm length is drilled into a metal slab having emissivity 0.7. If the metal slab is maintained at 650 K, make calculations for the radiation heat escape from the hole
A.	7 W
B.	3 W
C.	1 W
D.	9 W
Answer» C. 1 W

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