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Noun: Planck's constant
  1. The constant of proportionality relating the energy of a photon to its frequency, now defined as exactly 6.62607015 x 10^-34 Joule-seconds (J s)
    "Planck's constant is fundamental to quantum mechanics";
    - h, Planck constant

Type of: constant of proportionality, factor of proportionality

Encyclopedia: Planck's constant