Physics

Problem

A metal has threshold wavelength

450\,\text{nm}

. Determine the minimum photon energy required to just release electrons from its surface. Express your answer in electron-volts. (Use

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}