Question

Define work function of a metals.

Answer 1

Work functions:-

1. The minimum energy required to a free electrons to come out of the metal surface is called work functions of that metal.
2. Generally the work function is donated by $\varphi$.
3. For photo electric effect , Incident energy $E>\varphi$
4. SI unit of work function is joules or electron-volts $\left(eV\right)$ .