Emission coefficient is a coefficient in the power output per unit time of an electromagnetic source, a calculated value in physics. It is also used as a measure of environmental emissions (by mass) per MWh of electricity generated, see: Emission factor. In mathematics, a coefficient is a multiplicative factor that belongs to a certain object such as a variable (for example, the coefficients of a polynomial), a basis vector, a basis function and so on. ... Electromagnetism is the physics of the electromagnetic field: a field, encompassing all of space, composed of the electric field and the magnetic field. ... The willingness to question previously held truths and search for new answers resulted in a period of major scientific advancements, now known as the Scientific Revolution. ... An environment is a complex of external factors that acts on a system and determines its course and form of existence. ... Itaipu Dam is a hydroelectric generating station Electricity generation is the first process in the delivery of electricity to consumers. ...

Scattering of light

In Thompson scattering a charged particle emits radiation under incident light. The particle may be an ordinary atomic electron, so emission coefficients have practical applications.

If X dV dΩ dλ is the energy scattered by a volume element dV into solid angle dΩ between wavelengths λ and λ+dλ per unit time then the Emission coefficient is X. In mathematics, a coefficient is a multiplicative factor that belongs to a certain object such as a variable (for example, the coefficients of a polynomial), a basis vector, a basis function and so on. ...

The values of X in Thomson scattering can be predicted from incident flux, the density of the charged particles and their Thompson differential cross section (area/solid angle).

Spontaneous Emission

A warm body emitting photons has a monochromatic emission coefficient relating its temperature and total power radiation, this is sometimes called the second "Einstein coefficient", and can be deduced from quantum mechanical theory. The photon can be perceived as a wave or a particle, depending on how it is measured In physics, the photon (from Greek φοτος, meaning light) is a quantum of the electromagnetic field, for instance light. ... Something which is monochromatic has a single color. ... Fig. ...

See Also

• The Diode equation includes the emission coefficient
• Plasma physics.
• An emission coefficient is also given for ballistic secondary electron emission.
• Luminous coefficient

Types of diodes A diode functions as the electronic version of a one-way valve. ... The word plasma has a Greek root which means to be formed or molded (the word plastic shares this root). ... Properties The electron is a subatomic particle. ... The word emission generally means sending something out. ... The luminous coefficient is a coefficient that measures the integrated fraction of the radiant power that contributes to its luminous properties as evaluated by means of the standard luminosity function. ...

External links

• Astrophysics lecture slides on the emission coefficient from University of Chicago.