# Planck-s-constant meaning

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.noun

A universal constant (

*h*) which gives the ratio of a quantum of radiant energy (*E*) to the frequency (ν) of its source: it is expressed by the equation*E*=*h*ν, and its approximate numerical value is 6.626 × 10^{-34}joule second.noun

A physical constant that is used extensively in quantum mechanics and fixes the scale of quantization of many phenomena, such as the relation between the energy of a photon (a quantum of light) and its wavelength. Its value is approximately 6.626 × 10

^{&spminus;34}joule-seconds (equivalent to units of angular momentum). Planck's constant is fundamental to phenomena as the quantization of angular momentum and is used in Heisenberg's Uncertainty Principle.(physics) The constant of proportionality (symbol

*h*), relating the energy and frequency of a photon (6.626 x 10^{-34}joule-seconds); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action.noun

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## Origin of planck-s-constant

- After Max Karl Ernst Ludwig
**Planck**### From American Heritage Dictionary of the English Language, 5th Edition

- Named for Max Planck (1858-1947), German theoretical physicist, who discovered it in 1900.
### From Wiktionary