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  2. Planck relation - Wikipedia

    en.wikipedia.org/wiki/Planck_relation

    The Planck relation [1] [2] [3] (referred to as Planck's energy–frequency relation, [4] the Planck–Einstein relation, [5] Planck equation, [6] and Planck formula, [7] though the latter might also refer to Planck's law [8] [9]) is a fundamental equation in quantum mechanics which states that the energy E of a photon, known as photon energy, is proportional to its frequency ν: =.

  3. Planck constant - Wikipedia

    en.wikipedia.org/wiki/Planck_constant

    The Planck constant, or Planck's constant, denoted by , [1] is a fundamental physical constant [1] of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.

  4. Photon energy - Wikipedia

    en.wikipedia.org/wiki/Photon_energy

    Photon energy is the energy carried by a single photon. The amount of energy is directly proportional to the photon's electromagnetic frequency and thus, equivalently, is inversely proportional to the wavelength. The higher the photon's frequency, the higher its energy. Equivalently, the longer the photon's wavelength, the lower its energy.

  5. Matter wave - Wikipedia

    en.wikipedia.org/wiki/Matter_wave

    To find the wavelength equivalent to a moving body, de Broglie [2]: 214 set the total energy from special relativity for that body equal to hν: = = (Modern physics no longer uses this form of the total energy; the energy–momentum relation has proven more useful.)

  6. Planck's law - Wikipedia

    en.wikipedia.org/wiki/Planck's_law

    The 41.8% point is the wavelength-frequency-neutral peak (i.e. the peak in power per unit change in logarithm of wavelength or frequency). These are the points at which the respective Planck-law functions ⁠ 1 / λ 5 ⁠ , ν 3 and ⁠ ν 2 / λ 2 ⁠ , respectively, divided by exp ( ⁠ hν / k B T ⁠ ) − 1 attain their maxima.

  7. Energy level - Wikipedia

    en.wikipedia.org/wiki/Energy_level

    Conversely, an excited species can go to a lower energy level by spontaneously emitting a photon equal to the energy difference. A photon's energy is equal to the Planck constant (h) times its frequency (f) and thus is proportional to its frequency, or inversely to its wavelength (λ). [4] ΔE = hf = hc / λ,

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  9. Wave function - Wikipedia

    en.wikipedia.org/wiki/Wave_function

    In 1900, Max Planck postulated the proportionality between the frequency of a photon and its energy , =, [11] [12] and in 1916 the corresponding relation between a photon's momentum and wavelength, =, [13] where is the Planck constant.