The statement that the emissivity and absorptivity of a surface is surrounded by its own temperature are the same for both monochromatic and total radiation, is known as

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Kirchhoff's law states that for an object at thermal equilibrium, the emissivity (the ability to emit radiation) and absorptivity (the ability to absorb radiation) are equal for both monochromatic (single wavelength) and total radiation across all wavelengths. This principle is fundamental in understanding thermal radiation processes.

The Statement That the Emissivity and Absorptivity of a Surface