Planck constant

Plaque at the Humboldt University of Berlin:

Intensity of light emitted from a black body at any given frequency. Each color is a different temperature. Planck was the first to explain the shape of these curves.

Note that the (black) Rayleigh–Jeans curve never touches the Planck curve.

A schematization of the Bohr model of the hydrogen atom. The transition shown from the n = 3 level to the n = 2 level gives rise to visible light of wavelength 656 nm (red), as the model predicts.

The Planck constant (denoted $h$ , also called Planck's constant) is a physical constant that is the quantum of action, central in quantum mechanics.

First recognized in 1900 by Max Planck, it was originally the proportionality constant between the minimal increment of energy, $E$ , of a hypothetical electrically charged oscillator in a cavity that contained black body radiation, and the frequency, $f$ , of its associated electromagnetic wave. In 1905 the value $E$ , the minimal energy increment of a hypothetical oscillator, was theoretically associated by Einstein with a "quantum" or minimal element of the energy of the electromagnetic wave itself. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called the photon.

单词	Quantum Of Action
释义	Quantum Of Action 英语百科 Planck constant The Planck constant (denoted $h$ , also called Planck's constant) is a physical constant that is the quantum of action, central in quantum mechanics. First recognized in 1900 by Max Planck, it was originally the proportionality constant between the minimal increment of energy, $E$ , of a hypothetical electrically charged oscillator in a cavity that contained black body radiation, and the frequency, $f$ , of its associated electromagnetic wave. In 1905 the value $E$ , the minimal energy increment of a hypothetical oscillator, was theoretically associated by Einstein with a "quantum" or minimal element of the energy of the electromagnetic wave itself. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called the photon.
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Quantum Of Action

Planck constant