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Measured blackbody spectra remained finite at high frequency, while classical equipartition produced the divergent Rayleigh–Jeans prediction known as the ultraviolet catastrophe.
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Planck’s quantized energy elements solved the blackbody problem and initiated the quantum developments that culminated in quantum mechanics.
The source experiment, observation, anomaly, or problem materially motivated the development, revision, or acceptance of the target concept. Historical influence is not logical derivation; the edge detail states the documented role and avoids retrospective origin myths.
wp-physics-blackbody_ultraviolet_catastrophenist-blackbody