The Einstein (unit) reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Einstein (unit)

An einstein is a unit of irradiance, and is used in photochemistry. It is equal to Avogadro's number times the energy of one photon of light.

It is named in honor of Albert Einstein, who explained the photoelectric effect and introduced the idea of light quanta, now called photons, in a 1905 paper.

This is the "Einstein (unit)" reference article from the English Wikipedia. All text is available under the terms of the GNU Free Documentation License. See also our Disclaimer.