• ## Planck constant - Wikipedia

en.wikipedia.org/wiki/Reduced_Planck_constant The Planck constant, or Planck's constant, is the quantum of electromagnetic action that relates a photon's energy to its frequency. The Planck constant multiplied by a photon's frequency is equal to a photon's energy. The Planck constant is a fundamental physical constant denoted as , and of fundamental importance in quantum mechanics.In metrology it is used to define the kilogram in SI units.
• ## CODATA Value: reduced Planck constant - NIST

physics.nist.gov/cgi-bin/cuu/Value reduced Planck constant: Numerical value: 1.054 571 817... x 10-34 J s : Standard uncertainty (exact) Relative standard uncertainty (exact) Concise form
• ## Planck constant - Infogalactic: the planetary knowledge core

infogalactic.com/info/Planck_constant The resulting constant is called the reduced Planck constant or Dirac constant. It is equal to the Planck constant divided by 2π, and is denoted ħ (pronounced "h-bar"): The energy of a photon with angular frequency ω, where ω = 2πf, is given by. while its linear momentum relates to. where k is a wavenumber.
• ## CODATA Value: reduced Planck constant in eV s

physics.nist.gov/cgi-bin/cuu/Value reduced Planck constant in eV s: Numerical value: 6.582 119 569... x 10-16 eV s : Standard uncertainty (exact) Relative standard uncertainty (exact) Concise form 6.582 119 569... x 10-16 eV s : Click here for correlation coefficient of this constant with other constants
• ## Planck constant - Simple English Wikipedia, the free ...

simple.wikipedia.org/wiki/Planck_constant The reduced Planck constant (ħ) is a value that is sometimes used in quantum mechanics. It is defined by =. Planck units are sometimes used in quantum mechanics instead of SI. In this system the reduced Planck constant has a value of 1, so the value of the Planck constant is 2π.
• ## Planck’s constant | Definition, Units, Symbol, & Facts ...

www.britannica.com/science/Plancks-constant Planck’s constant, fundamental physical constant characteristic of the mathematical formulations of quantum mechanics, which describes the behavior of particles and waves on the atomic scale, including the particle aspect of light. The German physicist Max Planck introduced the constant in 1900.
• ## quantum mechanics - What is the point of the reduced ...

physics.stackexchange.com/.../what-is-the-point-of-the-reduced-plancks-consta... Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack Exchange
• ## Physics 342: Useful Constants

www.physics.rutgers.edu/~abrooks/342/constants.html 3.156 × 10 7 s. Return to Physics 342 homepage. Last updated: January 17, 2011 swj January 17, 2011 swj
• ## H-bar - Wikipedia

en.wikipedia.org/wiki/H-bar H-bar or h-bar can refer to: . H with stroke, a Latin letter H with a doubled horizontal stroke (Ħ ħ); Reduced Planck's constant, in which the above symbol represents as a mathematical symbol, ħ = h/(2π); Antihydrogen, an antimatter element represented by the symbol H; Steyr AUG HBAR, a light machine gun version of the AUG assault rifle; Multirests, indicated in musical notation through H-bars
• ## Reduced Planck Constant | Article about Reduced Planck ...

encyclopedia2.thefreedictionary.com/Reduced+Planck+Constant Looking for Reduced Planck Constant? Find out information about Reduced Planck Constant. Symbol: h . A fundamental constant with the value 6.626 076 × 10–34 joule seconds. According to quantum theory, electromagnetic radiation has a dual nature.... Explanation of Reduced Planck Constant