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  2. 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.

  3. Planck relation - Wikipedia

    en.wikipedia.org/wiki/Planck_relation

    The Planck relation [1] [2] [3] (referred to as Planck's energyfrequency 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: =.

  4. Matter wave - Wikipedia

    en.wikipedia.org/wiki/Matter_wave

    The de Broglie equations relate the wavelength λ to the modulus of the momentum | | =, and frequency f to the total energy E of a free particle as written above: [54] = | | = = = where h is the Planck constant.

  5. 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.

  6. Spectral density - Wikipedia

    en.wikipedia.org/wiki/Spectral_density

    To find the value of the energy spectral density ¯ at frequency , one could insert between the transmission line and the resistor a bandpass filter which passes only a narrow range of frequencies (, say) near the frequency of interest and then measure the total energy () dissipated across the resistor.

  7. Photon - Wikipedia

    en.wikipedia.org/wiki/Photon

    The energy of a system that emits a photon is decreased by the energy of the photon as measured in the rest frame of the emitting system, which may result in a reduction in mass in the amount /. Similarly, the mass of a system that absorbs a photon is increased by a corresponding amount.

  8. Wavelength - Wikipedia

    en.wikipedia.org/wiki/Wavelength

    The concept of wavelength is most often applied to sinusoidal, or nearly sinusoidal, waves, because in a linear system the sinusoid is the unique shape that propagates with no shape change – just a phase change and potentially an amplitude change. [15] The wavelength (or alternatively wavenumber or wave vector) is a characterization of the ...

  9. Wavenumber - Wikipedia

    en.wikipedia.org/wiki/Wavenumber

    where ν is the frequency of the wave, λ is the wavelength, ω = 2πν is the angular frequency of the wave, and v p is the phase velocity of the wave. The dependence of the wavenumber on the frequency (or more commonly the frequency on the wavenumber) is known as a dispersion relation.

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