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In 1900, Max Planck discovers Planck's law of black-body radiation. This featured entry focuses on the immediate decision and its direct historical impact.
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October 19 spans 57 recorded events across recorded history, from 202 BC to 2025. Below is a curated digest of the most significant moments tied to this date.
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The featured story and these ranked highlights form a quick summary. Every recorded event remains available in the chronology below.
Did you know
In 1900, Max Planck discovers Planck's law of black-body radiation. This featured entry focuses on the immediate decision and its direct historical impact.
Did you know
Max Karl Ernst Ludwig Planck was a German theoretical physicist. This helps explain why the event mattered beyond the initial announcement.
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Planck made many contributions to theoretical physics, primarily in his role as the originator of quantum theory and one of the founders of modern physics, which revolutionized understanding of atomic and subatomic processes. This clarifies the institutional and public response around the event.
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He is known for the Planck constant, , which is of foundational importance for quantum physics, and which he used to derive a set of units, now called Planck units, expressed in terms of physical constants. This shows how the event shaped policy and public communication in the same period.
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The Planck relation, E= ν, states that the energy of a photon is proportional to its frequency. This helps explain why the event mattered beyond the initial announcement.
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