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Planck's constant, which has a rounded value of 6.626 x 10^-34 Joules (or kg.m^2.s^2), is often used in quantum mechanics when determining the energy of a photon. We are currently using Planck's constant as it relates to the equation, E=hv, in which the energy of a photon (E) is equal to Planck's constant (h) multiplied by frequency (v). This constant was calculated as chemists recognized that the frequency was directly proportional to the energy of a photon.
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