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.
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 = hν, and its approximate numerical value is 6.626 × 10-34 joule second.
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.
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.