An ultraviolet photon with wavelength 200 nm strikes an aluminum surface with a work function φ = 4.08 eV and ejects an electron. What is the shortest wavelength λ that can be observed for the ejected electron?

You may find it useful to use the values for the following constants:
h c = 1240 eV·nm
electron mass m_e = 5.11 x 10⁵ eV/c²

λ = nm