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Planck constant

Planck's constant is the fundamental proportionality coefficient that relates discrete properties of particles to continuous properties of waves. By definition, the constant is exactly

 


Explanation

This physical constant is central in quantum mechanics. It is the proportionality factor between the energy quantity E and the frequency v, where holds E = hv.

 


History

The name of this constant is a tribute to the German physicist Max Planck (1858 - 1947), who chose the letter h for hilfe (help).


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