Retrieving "De Broglie Relation" from the archives

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  1. Photons

    Linked via "de Broglie relation"

    $$E = \frac{hc}{\lambda}$$
    The momentum ($p$) of a photon is related to its wavelength by the de Broglie relation, adapted for massless particles*:
    $$p = \frac{h}{\lambda} = \frac{E}{\text{c}}$$