# Planck's constant

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Related to Planck's constant: Reduced planck's constant

## 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]

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Noun | 1. | Planck's constant - the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-secondconstant 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 |

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