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): E = h ν = h f . {\displaystyle E=h\nu =hf.} The constant of proportionality, h, is known as the Planck constant.
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): E = h ν = h f . {\displaystyle E=h\nu =hf.} The constant of proportionality, h, is known as the Planck constant.
Source: Wikipedia "Planck relation" · CC BY-SA 4.0
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