Planck relation

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What Wikipedia says

The Planck relation (referred to as Planck's energy–frequency relation, the Planck–Einstein relation, Planck equation, and Planck formula, though the latter might also refer to Planck's law) is a fundamental equation in quantum mechanics which states that the photon energy E is proportional to the photon frequency ν (or f):

Excerpt from the Wikipedia article “Planck relation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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