Alaska
Albedo
Albedo (/ælˈbiːdoʊ/; from Latin albedo, meaning 'whiteness') is the measure of the diffuse reflection of solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a white body that reflects all incident radiation.
Etymology
The term albedo was introduced into optics by Johann Heinrich Lambert in his 1760 work Photometria. It is derived from Latin albedo "whiteness", in turn from albus "white". The word was used in astronomy in the 19th century before being more broadly applied to similar properties in the fields of physics, biology and chemistry.
Related Terms
- Reflectance: The fraction of incident electromagnetic power that is reflected at an interface, in contrast to the reflection coefficient, which represents the ratio of the reflected to incident electric field.
- Diffuse reflection: A reflection principle where an incoming light ray is scattered at many angles rather than at just one angle as in the case of specular reflection.
- Solar radiation: Radiant energy emitted by the sun from a nuclear fusion reaction that creates electromagnetic energy.
- Black body: An idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.
- White body: A theoretical body that reflects all incident light perfectly, without absorbing any, and appears white when it is viewed.
External links
- Medical encyclopedia article on Alaska
- Wikipedia's article - Alaska
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