Dirac h

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Dirac h

physics

Also known as: h-bar

Learn about this topic in these articles:

units of spin

In spin
…of a unit called the Dirac h, or h-bar (ℏ), equal to the Planck constant divided by 2π. For electrons, neutrons, and protons, the multiple is 0.5; pions have zero spin. The total angular momentum of nuclei more complex than the proton is the vector sum of the orbital angular…
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