The Photoelectric Effect

Ekinetic = Ephoton - εwork

Metal εwork (eV)
K 2.29
Na 2.36
Ca 2.87
Li 2.9
Mg 3.66
Pb 4.25
Ga 4.32

Question
Photoelectrons with kinteic energy 2 eV are ejected from a sample of sodium. What was the photon energy (in eV) of the light used?
Your answer: eV