### Planck constant

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

The **Planck constant** (**h**) is
6.62607015 × 10^{-34} m^{2} 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 **ℏ**) is h / 2π,
which is convenient because many equations
incorporate this expression.

(*physics,constant,quantum mechanics*)
**Further reading:**

http://en.wikipedia.org/wiki/Planck_constant

https://astronomy.swin.edu.au/cosmos/P/Planck%27s+Constant

https://physics.nist.gov/cgi-bin/cuu/Value?h

**Referenced by pages:**

black-body radiation

Bohr model

Brackett series

carbon monoxide (CO)

Compton wavelength

de Broglie wavelength

frequency

kelvin (K)

Lyman series (L)

Paschen series

photon energy

Planck function

Planck units

Saha equation

Stefan-Boltzmann constant (σ)

Heisenberg uncertainty principle

Wien approximation

Index