A body 1 in the form of a sphere of 2 cm radius at temperature T1 is l – McqOptions

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1.	A body 1 in the form of a sphere of 2 cm radius at temperature T1 is located in body 2, which is a hollow cube of 5 cm side and is at temperature T2 (T2 < T1). The shape factor F21 for radiation heat transfer becomes:
A.	0.34
B.	0.43
C.	0.57
D.	0.63
Answer» B. 0.43

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