Physics

Problem

The work function of sodium is

2.3\,\text{eV}

. Calculate the threshold wavelength for photoelectric emission from sodium. (Take

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

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

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