# Planck's constant/Related Articles

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*See also changes related to Planck's constant, or pages that link to Planck's constant or to this page or whose text contains "Planck's constant".*

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- Albert Einstein [r]: 20th-century physicist who formulated the theories of relativity.
^{[e]} - Angular momentum (quantum) [r]: A vector operator of which the three components have well-defined commutation relations.
^{[e]} - Atom (science) [r]: The defining unit of chemical elements.
^{[e]} - Avogadro's number [r]: The number of atoms in 12 gram of carbon-12 atoms in their ground state at rest.
^{[e]} - Black-body radiation [r]: An object or system which absorbs all radiation incident upon it and re-radiates energy.
^{[e]} - Born-Oppenheimer approximation [r]: A technique in quantum mechanics in which the kinetic energies of nuclei and electrons are calculated separately.
^{[e]} - Electromagnetic radiation [r]: a collection of electromagnetic waves, usually of different wavelengths.
^{[e]} - Electromagnetic spectrum [r]: The range of electromagnetic waves covering all frequencies and wavelengths.
^{[e]} - Electromagnetic wave [r]: A change, periodic in space and time, of an electric field
**E**(**r**,t) and a magnetic field**B**(**r**,t); a stream of electromagnetic waves, referred to as electromagnetic radiation, can be seen as a stream of massless elementary particles, named photons.^{[e]} - Energy (science) [r]: A measurable physical quantity of a system which can be expressed in joules (the metric unit for a quantity of energy) or other measurement units such as ergs, calories, watt-hours or Btu.
^{[e]} - Frequency [r]: For a periodic (i.e., repeating) phenomena, the number of repetitions per unit of time, usually one second; measured in Hertz
^{[e]} - GF method [r]: Method to compute the normal coordinates of a vibrating molecule.
^{[e]} - Hydrogen-like atom [r]: An atom, excluding hydrogen itself, with only one electron, having charge +(Z-1), where Z = atomic number.
^{[e]} - Ideal gas law [r]: Relates pressure, volume and temperature for hypothetical gases of atoms or molecules with negligible intermolecular forces.
^{[e]} - Intermolecular forces [r]: Non-covalent forces between atoms and molecules; often synonymous with Van der Waals forces.
^{[e]} - Lambert W function [r]: Used to solve equations in which the unknown appears both outside and inside an exponential function or a logarithm.
^{[e]} - Molecule [r]: An aggregate of two or more atoms in a definite arrangement held together by chemical bonds.
^{[e]} - Momentum [r]: mass of a particle times its velocity (a vector).
^{[e]} - NMR spectroscopy [r]: The use of
**electromagnetic radiation**, in the presence of a**magnetic field**, to obtain information regarding**transitions between different nuclear spin states**of the nuclei present in the sample of interest.^{[e]} - Nuclear magnetic resonance [r]: A property that magnetic nuclei have in a magnetic field and applied electromagnetic (EM) pulse, which cause the nuclei to absorb energy from the EM pulse and radiate this energy back out.
^{[e]} - Ohm [r]: SI unit of electrical impedance or, in the direct current case, electrical resistance, named after Georg Simon Ohm.
^{[e]} - Orch-OR [r]: A speculative theory of consciousness proposed in the mid-1990s by British theoretical physicist Sir Roger Penrose and American anesthesiologist Stuart Hameroff.
^{[e]} - Particle in a box [r]: A system in quantum mechanics used to illustrate important features of quantum mechanics, such as quantization of energy levels and the existence of zero-point energy.
^{[e]} - Photon [r]:
*Add brief definition or description* - Quantum fluids [r]:
*Add brief definition or description* - Quantum mechanics [r]:
*Add brief definition or description* - Rigid rotor [r]:
*Add brief definition or description* - Schrödinger equation [r]:
*Add brief definition or description* - Second [r]:
*Add brief definition or description* - Self-adjoint operator [r]:
*Add brief definition or description* - Solid harmonics [r]:
*Add brief definition or description* - Spherical harmonics [r]:
*Add brief definition or description* - Van der Waals equation [r]:
*Add brief definition or description* - Wave-particle duality [r]:
*Add brief definition or description*