Which of the following laws states that "good | vedclass

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(B) Kirchhoff's law states that the ratio of emissive power to the absorptive power corresponding to a particular wavelength and at a given temperatur

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Kirchhoff's law

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(B) Kirchhoff's law states that the ratio of emissive power to the absorptive power corresponding to a particular wavelength and at a given temperature is constant for all bodies:$e_{\lambda} / a_{\lambda} = 	ext{constant} = E_{\lambda}$where $E_{\lambda}$ is the emissive power of a perfect black body corresponding to the same wavelength and temperature. It is clear from the above relation that if $a_{\lambda}$ (absorptive power) is large for a body, $e_{\lambda}$ (emissive power) will also be large to keep the ratio constant, i.e., good absorbers are good emitters.

Which of the following laws states that "good absorbers of heat are good emitters"?

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