A thin shield of emissivity E3 on both sides is placed between two inf – McqOptions

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1.	A thin shield of emissivity E3 on both sides is placed between two infinite parallel plates of emissivities E1 and E2 and temperatures T1 and T2. If E1 = E2 = E3, then the fraction radiant energy transfer without shield takes the value
A.	0.25
B.	0.50
C.	0.75
D.	1.25
Answer» C. 0.75

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