Planck's constant

Also found in: Thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia.
Related to Planck's constant: Reduced planck's constant

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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
19 -- The Kilogram just got redefined and instead of being based upon a physical object that was established as the metric back in 1889, it is now based on a constant of nature, the Planck's constant. Scientists unanimously voted for the new Planck's constant based metric and for those unaware, the Planck's constant is a physical constant that relates energy carried by a photon to its frequency.
With effect from May 20 next year, the kilogram will be defined on the basis of a calculation from Planck's constant, a fundamental constant of quantum physics that expresses a relationship between energy and the frequency of subatomic particles such as photons.
From this result, we infer that the electron is formed by two indivisible elements: a quantum of electric charge and a quantum of magnetic flux, the product of which is equal to Planck's constant. The electron's magnetic flux is simultaneously the cause and the consequence of the circular motion of the electric charge:
With regard to the eponyms list, Avogadro's number is more well-known than his hypothesis, and correct or standard renderings are Lot's wife, Planck's constant, Wheatstone bridge, and Zorro's mask.
The new NIST measurement of Planck's constant is 6.626069934 x 10-34 kg-m2/s, with an uncertainty of only 13 parts per billion.
The smallest unit of action is one quantum of action, which is a universal constant denoted by "h" (Planck's constant) where n is an integer:
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.
where h (~6.626 x [10.sup.-34] [m.sup.2] x kg x [s.sup.-1]) is Planck's constant, T (K) is the blackbody temperature, k (~1.381 x [10.sup.-23] [m.sup.2] x kg x [s.sup.-2] x [K.sup.-1]) is the Boltzmann constant, [lambda](m) is the wavelength, and c (~2998 x [10.sup.8] m x [s.sup.-1]) is the speed of light.
This task requires a highly accurate measurement of Planck's constant, which links energy and frequency.
Trinity, FL, January 25, 2015 --( “Quantum Energy and Matter Creation” published in the Journal of Astrophysical Mechanics by Dimiter Bayramov, makes a novel interpretation of Planck's constant and describes how the stars use gravity to filter thermal energy and create matter.