At a certain temperature for a given waveleng | vedclass

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(B) According to Kirchhoff's law of radiation,at a certain temperature and for a given wavelength,the ratio of the emissive power $(E_{\lambda})$ of a

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Emissivity

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(B) According to Kirchhoff's law of radiation,at a certain temperature and for a given wavelength,the ratio of the emissive power $(E_{\lambda})$ of a body to the emissive power $(E_{b\lambda})$ of a black body at the same temperature is defined as the emissivity (or spectral emissivity) of the body.Mathematically,$\epsilon_{\lambda} = \frac{E_{\lambda}}{E_{b\lambda}}$.Therefore,the correct option is $B$.

At a certain temperature for a given wavelength,the ratio of the emissive power of a body to the emissive power of a black body in the same circumstances is known as:

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