Planck's constantPlanck's constant
Physics a universal constant (h) which gives the ratio of a quantum of radiant energy (E) to the frequency (?) of its source: it is expressed by the equation E = h?, and its approximate numerical value is 6.626 × 10 joule second
often Planck constant
Origin of Planck's constantafter Planck
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.
Origin of Planck's constantAfterMax Karl Ernst Ludwig Planck
Named for Max Planck (1858-1947), German theoretical physicist, who discovered it in 1900.