# Planck's constant

Planck's constant
Planck's constant 'plaŋ(k)s-, 'pläŋ(k)s- n a constant that gives the unvarying ratio of the energy of a quantum of radiation to its frequency and that has an approximate value of 6.626 × 10-34 joule second symbol h
Planck 'pläŋk Max Karl Ernst Ludwig (1858-1947)
German physicist. Planck is credited with originating the quantum theory in physics. Throughout his career he taught theoretical physics at a succession of German universities. In 1900 he introduced Planck's constant as a part of his accurate formulation of the distribution of the radiation emitted by a blackbody, which is a perfect absorber of radiant energy. His discoveries established the field of quantum physics. Planck is also remembered for his work relating to thermodynamics and mechanics and to electrical and optical problems associated with radiation of heat and with the quantum theory. He was awarded the Nobel Prize for Physics in 1918.

Medical dictionary. 2011.

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• Planck's constant — [plaŋks, pläŋks] n. [after PLANCK Max (Karl Ernst Ludwig)] Physics a universal constant ( h) which gives the ratio of a quantum of radiant energy ( E) to the frequency (ν) of its source: it is expressed by the equation E = hν, and its approximate …   English World dictionary

• Planck's constant — Physics. the fundamental constant of quantum mechanics, expressing the ratio of the energy of one quantum of radiation to the frequency of the radiation and approximately equal to 6.624 × 10 27 erg seconds. Symbol: h Also, Planck constant. [1905… …   Universalium

• Planck’s constant — Planko konstanta statusas T sritis fizika atitikmenys: angl. Planck’s constant vok. Plancksches Wirkungsquantum, n rus. постоянная Планка, f pranc. constante de Planck, f …   Fizikos terminų žodynas

• Planck's constant — Planck s′ (or Planck′) con′stant n. phs a unit used in quantum mechanics that equals the ratio of the energy of a quantum of radiation to the frequency of the radiation, approximately 6.626 x 10 34 joule second Symbol: h • Etymology: 1905–10;… …   From formal English to slang

• planck's constant — Constant value (6.626 x 10 34 watt seconds squared) which, when multiplied by the frequency of radiation, determines the amount of energy in a photon …   Dictionary of automotive terms

• Planck's constant — n. (also Planck constant) a fundamental constant, equal to the energy of quanta of electromagnetic radiation divided by its frequency, with a value of 6.626 x 10( 34) joules. Etymology: M. Planck, Ger. physicist d. 1947 …   Useful english dictionary

• Planck's constant — noun Etymology: Max K. E. L. Planck Date: 1910 a constant that gives the unvarying ratio of the energy of a quantum of radiation to its frequency and that has an approximate value of 6.626 × 10 34 J•s symbol h …   New Collegiate Dictionary

• Planck's constant — noun Physics a fundamental constant relating the energy of a quantum of electromagnetic radiation to its frequency, equal to 6.626 × 10 34 joules. Origin early 20th cent.: named after the German physicist Max Planck …   English new terms dictionary

• Planck's constant — /ˈplæŋks kɒnstənt / (say plangks konstuhnt) noun Physics a universal constant (approx. 6.626 × 10 34 joule seconds) expressing the proportion of the energy of any form of wavelike radiation to its frequency. Symbol: h {named after Max Planck,… …

• Planck's constant — noun the constant of proportionality relating the energy and frequency of a photon (6.626 x 10 joule seconds); also related to the indeterminacy limit in the Heisenberg uncertainty principle …   Wiktionary