Planck's constant


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Planck's constant

 (plängks)
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.]

Planck's′

(or Planck′) con′stant,


n.
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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TEHRAN (FNA)- Using a state-of-the-art device for measuring mass, researchers at the National Institute of Standards and Technology (NIST) have made their most precise determination yet of Planck's constant, an important value in science that will help to redefine the kilogram, the official unit of mass in the SI, or international system of units.
For example, Niels Bohr's work on the internal structure of the atom is firmly grounded in the accuracy of Planck's constant, discovered in 1900, which explained the basic relation between energy and frequency.
1]) is Planck's constant, T (K) is the blackbody temperature, k (~1.
Scientists can use Planck's constant to measure and describe mass, as the two are mathematically connected through another natural constant, the speed of light.
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where kB is the Boltzmann constant, G is the gravitational constant, h is Planck's constant, and c is speed of light.
The metrologists eventually chose Planck's constant, which describes the relationship between the energy of a photon and the frequency of light it emits.
By 2014, the unit of mass will be defined in terms of Planck's Constant, which is defined in terms of seconds and meters.
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.