What is the photoelectric effect?

(N/A) The photoelectric effect is the phenomenon in which electrically charged particles (electrons) are released from or within a material when it absorbs electromagnetic radiation,such as light.
When light of a sufficiently high frequency (above the threshold frequency) falls on a metal surface,it causes the emission of electrons from the surface.
These emitted electrons are known as photoelectrons.
The process is governed by the equation: $K_{max} = h\nu - \Phi$,where $K_{max}$ is the maximum kinetic energy of the emitted photoelectrons,$h$ is Planck's constant,$\nu$ is the frequency of incident light,and $\Phi$ is the work function of the metal.