Physics

Problem

Light of frequency

6.5\times10^{14}\,\text{Hz}

falls on a sodium surface having work function

2.28\,\text{eV}

. Calculate the stopping potential required to just stop the most energetic photo-electrons. \newline (Take

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

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

)