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From the article Match the Emitter to the Task

In 1860, Gustav Kirchhoff used the term “blackbody” to refer to an object that perfectly absorbs and thereby perfectly emits energy. In 1894, Wilhelm Wien developed his displacement law, which provided the general form of the equation for the spectral distribution of the radiation from a blackbody. Unfortunately, it agreed only with the experimental data at short wavelengths. In 1900, Lord Rayleigh derived an expression that fit the experimental data for long wavelengths, but his expression predicted that energy would increase without limit as the wavelength decreases, earning it the dubious distinction as the “ultraviolet catastrophe.” Max Planck interpolated between Wien and Rayleigh to provide a radiation formula that was valid at all wavelengths. He presented his paper to the German Physical Society on Oct. 19, 1900. This introduced the concept of quantum physics.
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