# How is planck's constant used in the photoelectric effect?

##### 1 Answer
Mar 16, 2014

The energy of an individual photon is given by $E = h \cdot \nu$; where $h$ is Planck's constant and $\nu$ is the frequency of the photon.

If the photon's energy exceeds the binding energy of a surface electron (typically in a metal), then the electron can be ejected from the surface. Any energy in excess of the binding energy appears as kinetic energy of the ejected electron. This is the photoelectric effect.