Use $h=6.626\times 10^{-34}\mathrm{J}\mathrm{s}$, $c=3.0\times 10^8\mathrm{m}{\mathrm{s}}^{-1}$, $1\mathrm{eV}=1.6\times 10^{-19}\mathrm{J}$ and $E_1=-13.6\mathrm{eV}$. Radiation from the $n=4\to n=2$ transition of hydrogen is incident on a metal whose threshold wavelength is $600\mathrm{nm}$. Find the maximum kinetic energy of the ejected electrons in eV (two decimals).

Numerical answer type, answer in eV, tolerance 0.02.