In photo electric effect, if the energy required to over come the attractive forces on the electron (work function) of Li, Na and Rb are `2.41eV, 2.3eV` and `2.09eV` respectively, the work function of ''K'' could approximately by in eV

Options

A. `2.52`
B. `2.2`
C. `2.35`
D. `2.01`

Answer

B

Explanation

As the size of atom increases, energy required to over come the attractive forces on the outer most electron decreases.