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Planck constant (h)

| 🗖 nosplit | ↑ parent "Planck's law" | words: 163 | descendant words: 258 | descendants: 2
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Proportionality factor in the Planck-Einstein relation between light energy and frequency.
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And analogously for matter, appears in the de Broglie relations relating momentum and frequency. Also appears in the Schrodinger equation, basically as a consequence/cause of the de Broglie relations most likely.
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Intuitively, the Planck constant determines at what length scale do quantum effects start to show up for a given energy scale. It is because the Plank constant is very small that we don't perceive quantum effects on everyday energy/length/time scales. On the , quantum mechanics disappears entirely.
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A very direct way of thinking about it is to think about what would happen in a double-slit experiment. TODO think more clearly what happens there.
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Defined exactly in the 2019 redefinition of the SI base units to:
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Ancestors

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