At a certain temperature for given wave length, the ratio of emissive – McqOptions

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1.	At a certain temperature for given wave length, the ratio of emissive power of a body to emissive power of black body in same circumstances is known as [RPMT 1997]
A.	Relative emissivity
B.	Emissivity
C.	Absorption coefficient
D.	Coefficient of reflection
Answer» C. Absorption coefficient

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