Plancks constant

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Planck's constant

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

Planck's constant , fundamental constant of the quantum theory . It is represented by the letter h and has a value of 6.63 × 10 -34 J-sec. The combination h /2π, denoted by h (called "h-bar" ), occurs frequently.

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Planck constant

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

Planck constant (symbol h) A constant that relates the energy of a photon to its frequency. It has the value 6.626 069 × 10-34 J s. It is named after the German physicist Max Karl Ernst Ludwig Planck (1858–1947).
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