Astrophysics (Index)About

Planck constant

(h, Planck's constant)
(quantum of action in quantum mechanics)

The Planck constant (h) is 6.62607015 × 10-34 m2 kg/s (units equivalent to J s). The relation of a photon's energy (E) to frequency (f) is:

E = h × f

The reduced Planck constant (aka Dirac constant, abbreviated ) is h / 2π, which is convenient because many equations incorporate this expression.

(physics,constant,quantum mechanics)
Further reading:

Referenced by pages:
black-body radiation
Bohr model
Brackett series
carbon monoxide (CO)
Compton wavelength
de Broglie wavelength
kelvin (K)
Lyman series (L)
Paschen series
photon energy
Planck function
Planck units
Saha equation
Stefan-Boltzmann constant (σ)
Heisenberg uncertainty principle
Wien approximation