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
A sample of calcium is exposed to light with a photon energy of 3.3 eV. What is the kinetic energy of photoelectrons ejected (in eV)?
Your answer: eV