علاقة پلانك

(تم التحويل من Planck–Einstein relation)

علاقة پلانك[1][2][3] (التي يشار إليها بإسم علاقة پلانك للطاقة-التردد،[4] علاقة پلانك-آينشتاين،[5] معادلة پلانك،[6] وصيغة پلانك،[7] though the latter might also refer to قانون پلانك[8][9]) هي معادلة أساسية في ميكانيكا الكم تنص أن الطاقة E لفوتون، والمعروفة بإسم طاقة الفوتون، تتناسب مع تردده ν:

The constant of proportionality, h, is known as the Planck constant. Several equivalent forms of the relation exist, including in terms of angular frequency ω:
where . Written using the symbol f for frequency, the relation is

The relation accounts for the quantized nature of light and plays a key role in understanding phenomena such as the photoelectric effect and black-body radiation (where the related Planck postulate can be used to derive Planck's law).

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الصيغ الطيفية

Light can be characterized using several spectral quantities, such as frequency ν, wavelength λ, wavenumber , and their angular equivalents (angular frequency ω, angular wavelength y, and angular wavenumber k). These quantities are related through

so the Planck relation can take the following "standard" forms:
as well as the following "angular" forms:

The standard forms make use of the Planck constant h. The angular forms make use of the reduced Planck constant ħ = h/. Here c is the speed of light.


علاقة دى برولي

The de Broglie relation,[10][11][12] also known as de Broglie's momentum–wavelength relation,[4] generalizes the Planck relation to matter waves. Louis de Broglie argued that if particles had a wave nature, the relation E = would also apply to them, and postulated that particles would have a wavelength equal to λ = h/p. Combining de Broglie's postulate with the Planck–Einstein relation leads to

or

The de Broglie relation is also often encountered in vector form

where p is the momentum vector, and k is the angular wave vector.

شرط تردد بور

Bohr's frequency condition[13] states that the frequency of a photon absorbed or emitted during an electronic transition is related to the energy difference (ΔE) between the two energy levels involved in the transition:[14]

This is a direct consequence of the Planck–Einstein relation.

انظر أيضاً

المراجع

  1. ^ French & Taylor (1978), pp. 24, 55.
  2. ^ Cohen-Tannoudji, Diu & Laloë (1973/1977), pp. 10–11.
  3. ^ Kalckar 1985, p. 39.
  4. ^ أ ب Schwinger (2001), p. 203.
  5. ^ Landsberg (1978), p. 199.
  6. ^ Landé (1951), p. 12.
  7. ^ Griffiths, D. J. (1995), pp. 143, 216.
  8. ^ Griffiths, D. J. (1995), pp. 217, 312.
  9. ^ Weinberg (2013), pp. 24, 28, 31.
  10. ^ Weinberg (1995), p. 3.
  11. ^ Messiah (1958/1961), p. 14.
  12. ^ Cohen-Tannoudji, Diu & Laloë (1973/1977), p. 27.
  13. ^ Flowers et al. (n.d), 6.2 The Bohr Model
  14. ^ van der Waerden (1967), p. 5.

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