The event appears four-dielectric has been discovered for the first time by ultraviolet radiation falling metal surface effects causes electrons emitted from the surface of the metal. This emitted electron is called by students is not yet at that time, any physics. Such a phenomenon can explain properly, until in 1905 Einstein have adopted the concept of a blank about the instability of the value of energy explains the event appears four-dielectric correctly, and later in 1916, lali axis. The trial has confirmed the occurrence of four-dielectric, and found that the experimental results as Einstein described by Einstein looked light as a lump sum of energy also known as Photon photon energy values, which is when equal surface effects. fell hv with metal work function W is equal to the energy of the photon, part is used in the electron-holding out, tho the metal surface. Photon's energy and the rest will be used as the kinetic energy of the electron-Foro.
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