Photoelectric+effect

=The Photoelectric effect= The Photoelectric effect occurs when light, incident on a metal, causes emission of electrons from the surface. The discovery of this effect in 1887, seemed to contradict the idea that light was a wave. It suggested that light energy did not depend upon the wave amplitude but only upon the frequency. This was an idea suggested by Max Planck and it was extended by Einstein in 1905, when he realised that light is absorbed and emitted in discrete units, or q//uanta,// of energy. Einstein proposed an equation to explain the Photoelectric effect which used the quantised or particle model of light.

[|The Photo Electric Effect presentation - Ashley Wells.ppt]