| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 1,504,922,707 visitors served. |
|
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
Planck's constant |
Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia, Hutchinson | 0.07 sec. |
|
Planck's constant (plängks), fundamental constant of the quantum theory quantum theory, modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles; the quantum theory and the theory of relativity together form the theoretical basis of modern physics. ..... Click the link for more information. . 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. Planck's constant A fundamental physical constant which represents the elementary quantum of action, action being defined as energy multiplied by time. Introduced by Max Planck in 1900, it has the value h = 6.6261 × 10-27 erg-second or 6.6261 × 10-34 joule-second. The symbol ℏ, sometimes called the Dirac h, is often used for convenience in physics to denote the quantity h/2π, where π = 3.1416…. As used by Planck in deriving his radiation law, h multiplied by the frequency of radiation represented a bundle of energy, that is, a quantum of energy. Radiant energy at any wavelength can occur only as multiples of this energy; thus energy is quantized. See Compton effect, Fundamental constants, Heat radiation, Quantum mechanics How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
|
| ? Mentioned in | ? References in periodicals archive | ||
|---|---|---|---|
| Those are the size of the electron's charge, the speed of light, and Planck's constant, which defines the scales at which quantum phenomena operate. 33 MeV) + [Beta] - where h is Planck's constant and v is the frequency in Hz. It describes quintessence by using only simple constants of nature, such as the speed of light, the gravitational constant, and Planck's constant of quantum mechanics. |
| Encyclopedia |
| Free Tools: |
For surfers:
Browser extension |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup | Partner with us |
|---|