Planck relation

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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. Several equivalent forms of the relation exist, including in terms of angular frequency ω: E = ℏ ω , {\displaystyle E=\hbar \omega ,} where the reduced Planck constant is ℏ = h / 2 π {\displaystyle \hbar =h/2\pi } . The relation accounts for the quantized nature of light and plays a...

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