If between wavelength $$\lambda $$and $$\lambda +d\lambda $$, $${{e}_{\lambda }}$$and $${{a}_{\lambda }}$$ be the emissive and absorptive powers of a body and $${{E}_{\lambda }}$$ be the emissive power of a perfectly black body, then according to Kirchoff's law, which is true [RPMT 1998; MP PET 1991]

Question

If between wavelength $$\lambda $$and $$\lambda +d\lambda $$, $${{e}_{\lambda }}$$and $${{a}_{\lambda }}$$ be the emissive and absorptive powers of a body and $${{E}_{\lambda }}$$ be the emissive power of a perfectly black body, then according to Kirchoff's law, which is true                                     [RPMT 1998; MP PET 1991]

TuteeHUB · Accepted Answer

$${{e}_{\lambda }}{{a}_{\lambda }}{{E}_{\lambda }}$$= constant

TuteeHUB · Answer

$${{e}_{\lambda }}={{a}_{\lambda }}={{E}_{\lambda }}$$

TuteeHUB · Answer

$${{e}_{\lambda }}{{E}_{\lambda }}={{a}_{\lambda }}$$

TuteeHUB · Answer

$${{e}_{\lambda }}={{a}_{\lambda }}{{E}_{\lambda }}$$

1.	If between wavelength \[\lambda \]and \[\lambda +d\lambda \], \[{{e}_{\lambda }}\]and \[{{a}_{\lambda }}\] be the emissive and absorptive powers of a body and \[{{E}_{\lambda }}\] be the emissive power of a perfectly black body, then according to Kirchoff's law, which is true [RPMT 1998; MP PET 1991]
A.	\[{{e}_{\lambda }}={{a}_{\lambda }}={{E}_{\lambda }}\]
B.	\[{{e}_{\lambda }}{{E}_{\lambda }}={{a}_{\lambda }}\]
C.	\[{{e}_{\lambda }}={{a}_{\lambda }}{{E}_{\lambda }}\]
D.	\[{{e}_{\lambda }}{{a}_{\lambda }}{{E}_{\lambda }}\]= constant
Answer» D. \[{{e}_{\lambda }}{{a}_{\lambda }}{{E}_{\lambda }}\]= constant

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