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# Planck constant ()

| 🗖 nosplit | ↑ parent "Planck-Einstein relation" | words: 163 | descendant words: 195 | descendants: 1
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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 Schrödinger 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: $$6.62607015×10−34J⋅s (47)$$
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