Question

What is the work function of an electron?

Answer 1

1. The amount of energy (or work) necessary to entirely remove an electron from a metal surface is known as the electronic work function.
2. This energy is a measure of how securely a metal retains its electrons, or how much lower the energy of an electron is while present within the metal than when it is fully free.
3. The formula for work function $W_0=E-K.E_{max}$, where $K.E_{max}$ is maximum kinetic emergy of electron.