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Planck's constant
(redirected from Planck 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-second.
Planck's constant (h)
[plangks]
Etymology: Max Planck, German physicist, 1858-1947
a fundamental physical constant that relates the energy of radiation to its frequency. It is expressed as 6.63 × 10-27 erg-seconds or 6.63 × 10-34 joule-seconds. See also photon.
photon 
The basic unit of radiant energy defined by the equation
E = hν
where h is Planck's constant (6.62 ✕ 10−34 joule ✕ second), ν the frequency of the light and E the energy difference carried away by the emission of a single photon of light. The term photon usually refers to visible light whereas the term quantum refers to other electromagnetic radiations. See quantum theory; wave theory; troland.
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The Planck radiation law describes the specific spectral radiation M emanating from the idealized black body: [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (2) where [lambda] is wavelength, T is the absolute temperature, h is the Planck constant and c is the speed of light.
Application of infrared thermography in civil ... by Wild, Walter / Proceedings of the Estonian Academy of Sciences: Engineering
Scientists at NPL hope that if they can find an accurate and fixed value for the Planck constant they will solve the kilogram problem.
UK team make light work of redefining the kilogram by guardian.co.uk / guardian.co.uk
The energy values and the neutron wave functions in such a system depend on m, g, on the Planck constant and on the quantum number n only.
Investigation of the neutron quantum states in the Earth's ... by Lucovac, L. / Journal of Research of the National Institute of Standards and Technology
 
 
 
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