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 ?
Scientists measure Planck's constant using precisely known standards, including those for mass and electrical current.
It was shown that in the absence of a purely gravitational measurement of Planck's constant one cannot at present rule out the possibility that gravitational quanta may be scaled by the more diminutive of nature's two elementary "actions", namely, [e.
Currently, researchers use two types of experiment to measure Planck's constant, and both require vacuums.
Recent documentation of nonlocal communications types I and II by science and the proposition of the existence of nonlocal type III poses a challenge for the velocity of light, Planck's constant, and the entropy barrier, respectively.
Okun did find an important relationship; it is just that the estimates of his coefficient have changed whereas Planck's constant has not.
Further there is a definite limit, Planck's constant, that separates human knowing from the objective knowledge of the position and the velocity of a particle.
From simple measurements of Planck's constant to testing violations of Bell's inequalities using entangled photons, Exploring Quantum Physics through Hands-on Projects not only immerses readers in the process of quantum mechanics, it provides insight into the history of the field how the theories and discoveries apply to our world not only today, but also tomorrow.
wherein v, c, h, k and T represent the frequency of interest, the speed of light, *1 Planck's constant, Boltzmann's constant, and absolute temperature, respectively.
Producing a number with a plausible length for the atomic spoke was possible only by combining the key quantity in quantum theory, Planck's constant, with the electric charges and masses of the electron and nucleus.
Combining the speed of light, the electric charge of an electron, and Planck's constant, alpha has always been measured on Earth to have the same value, approximately 1/137.