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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
\( \mathrm{P} \) emissive power of a perfectly black body, then according to

W Kirchoff's law, which is true
[MP PET 1991; RPMT 1998]
(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
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