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Q. Good emitters are good absorbers is a statement concluded from

Haryana PMTHaryana PMT 2009Thermal Properties of Matter

Solution:

According to Kirchhoffs law the ratio of emissive power to absorptive power is same for all surfaces at the same temperature and is equal to the emissive power of a perfectly black body at that temperature.
Hence, $\frac{e_{1}}{a_{1}}=\frac{e_{2}}{a_{2}}=\ldots\left[\frac{E}{A}\right]_{\text {perfectly black body }}$
Now, since $\left(E_{\lambda}\right)_{\text {black }}$ is constant at a given temperature, this implies that good absorber is a good emitter (or radiator).