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
hydrogen (H)
kelvin (K)
Lyman series (L)
Paschen series
photon energy
Planck function
Planck units
quantum system
Saha equation
Stefan-Boltzmann constant (σ)
Heisenberg uncertainty principle
Wien approximation