Question

How does one explain the emission of electrons from a photosensitive surface with the help of Einstein's photoelectric equation?

Answer 1

In photoelectric effect, an electron from a photosensitive surface, absorbs a quantum of electromagnetic radiation energy$\left(h\upsilon \right)$. If this energy absorbed exceeds the minimum energy needed for the electron to escape from the photosensitive surface( Work function${\varphi }_o$ ) ,the electron are emitted with maximum kinetic energy ($k_{max}$) ;

$k_{max}=h\upsilon -{\varphi }_o$

This is Einstein's photoelectric equation.