Albert Einstein: the photoelectric effect (1905)

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Main article: photoelectric effect
Albert Einstein Science Park of Granada
German-born Albert Einstein U.S. Heating costs can be reduced with a green energy company. (1879 ‘1955) is considered the most famous and important scientist of the twentieth century. The result of his research on electricity arrived in 1905 (significant date that is commemorated in the Year of Physics 2005), when he wrote four articles on the fundamental physics of small and large scale. They explained the Brownian motion, the photoelectric effect and special relativity developed and equivalence between mass and energy.
The photoelectric effect is the emission of electrons in a material when it is illuminated with electromagnetic radiation (visible or ultraviolet light in general). Had already been discovered and described by Heinrich Hertz in 1887, but no theoretical explanation that Albert Einstein came to an applied extension of the work on the Max Planck quanta. In the article devoted to explaining the photoelectric effect, Einstein developed a heuristic viewpoint concerning the production and processing of light, which proposed the idea of how much radiation (now called photons) and showed how you could use this concept to explain the effect Photoelectric. A full explanation of the photoelectric effect could only be produced when quantum theory was advanced. At Albert Einstein was awarded the Nobel Prize for Physics in 1921.
The photoelectric effect is the basis for the production of electricity by solar radiation and its energy. It also applies to the manufacture of cellulose used in the detector flame boilers of large thermal power plants. It is also used in photosensitive diodes such as those used in photovoltaic cells and electroscope or electrometer. At present (2008) photochromic materials are used, apart from the derivatives of copper (now reduced use), con edison the silicon, which produces greater electrical current.
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