Physics

Problem

Ultraviolet light of frequency

1.20\times10^{15}\,\text{Hz}

is incident on a sodium surface whose work function is

2.3\,\text{eV}

. Calculate the maximum kinetic energy of the emitted photo-electrons in eV. (Take

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

;

1\,\text{eV} = 1.6\times10^{-19}\,\text{J}