Planck develops the thermodynamics and electrodynamics of radiation inside cavities, then confronts the measured distribution of energy across frequencies. The resulting law required a new constant and an unfamiliar restriction on how oscillators exchange energy.
The derivation is mathematically demanding, but historically central. It records the route by which a technical radiation problem opened the quantum era, even before the full meaning of quantization was understood.
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This catalog record links to Project Gutenberg’s public-domain edition. Historical science books are valuable primary sources, but older claims should be compared with current evidence before being treated as modern scientific guidance.
