Physics

Problem

Monochromatic light of wavelength

400\,\text{nm}

falls on a metal whose work function is

2.0\,\text{eV}

. Calculate the stopping potential required to reduce the photocurrent to zero. (Take

h = 6.63\times10^{-34}\,\text{J s}

c = 3.0\times10^{8}\,\text{m s}^{-1}

and

e = 1.6\times10^{-19}\,\text{C}