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Question If between wavelength \( \lambda \) and \( \lambda+\mathrm{d} \lambda, e_{\lambda} \) 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 Kirchoffs law, which is true
(A)  \( e_{\lambda}=a_{\lambda}=E_{\lambda} \)
(B) \( e_{\lambda} E_{\lambda}=a_{\lambda} \)
(C) \( e_{\lambda}=a_{\lambda} E_{\lambda} \)
(D) \( e_{\lambda} a_{\lambda} E_{\lambda}=\mathrm{constant} \)📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live