Reduced Planck constant ( $ℏ = h / (2 π)$ )

The reduced Planck constant is the Planck constant divided by

2 π

.

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Atomic units
Independent spin Barnett response
Past exam of the physics A course of the University of Cambridge / 2017 / Paper 2 / Section A / 5 / Solution
Past exam of the physics B course of the University of Cambridge / 2021 / Paper 2 / Section C / C9 / c / Solution
Past exam of the physics B course of the University of Cambridge / 2022 / Paper 2 / Section C / C9 / a / Solution
Past exam of the physics course of the year 1 of the natural sciences course of the University of Cambridge / 2018 / Section A / 3 / Solution
Past exam of the physics course of the year 1 of the natural sciences course of the University of Cambridge / 2022 / Section B / 9 / a / Solution
Reduced Planck constant

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Reduced Planck constant by

Ciro Santilli  40 Updated 2025-07-16

Appears in the Schrödinger equation.

Equals the quantum of angular momentum in the Bohr model.

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