Planck's constant

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Planck's constant

n. Symbol h
The constant of proportionality relating the energy of a photon to the frequency of that photon. Its value is approximately 6.626 × 10-34 joule-seconds.

[After Max Karl Ernst Ludwig Planck.]


(or Planck′) con′stant,

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
[1905–10; after M. K. E. Planck]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Planck's constant - the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
constant of proportionality, factor of proportionality - the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality
References in periodicals archive ?
This leap in science is due in no small part to the National Research Councils (NRC) contribution of a calculation of Planck's constant with the lowest uncertainty ever achieved.
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1]) is Planck's constant, T (K) is the blackbody temperature, k (~1.
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The metrologists eventually chose Planck's constant, which describes the relationship between the energy of a photon and the frequency of light it emits.
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He then discusses Newton's constant, G, and Planck's constant, h, and concludes, "The values of G, like c and h, depends on the system of units being used and likewise is not a universal constant.