Niagara River near The William B. See the last two links below under Further Reading for more on unit conversions. The energy of a photon is given by the Planck-Einstein relation, which states that the energy of a photon is equal to its frequency nu multiplied by a proportionality constant h , known as Planck's constant :. Image courtesy of RF. Send suggestions, comments, and new entry desires include the URL if applicable to us by email.
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