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New Episode Retells How the Quantum Was Discovered

Original: New episode: How the Quantum Was Discovered. Rubens and Kurlbaum measure the light of a hot box with crystals of rock sa

A new episode recounts the experimental breakthrough behind quantum theory: Rubens and Kurlbaum measured the light of a heated cavity using rock salt crystals, showing that Wien's law failed. On 7 October 1900 Rubens informed Max Planck, who that evening derived his blackbody formula and sent it on a postcard, before presenting his quantum hypothesis on 14 December.

Why now: Physics history enthusiasts are discussing the episode's retelling of the pivotal experiments that led Planck to quantum theory.

Max PlanckHeinrich RubensFerdinand KurlbaumWien's law

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• New episode: How the Quantum Was Discovered. Rubens and Kurlbaum measure the light of a hot box with crystals of rock salt, and Wien's law fails. On Sunday 7 October Rubens tells Planck; that evening Planck finds the formula and posts it on a card. On 14 December he counts the… · principiah · 1

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