Position affects how much energy required to free them. An electron that requires min amount of energy to free it (work function) would have the most energy left over from the incident photon. Only few emitted photoelectrons have this max KE
Using y=mx+c, KEmax=hf-∅ ∴ gradient is Planck’s constant and y intercept is −work function
13.3 Einstein's photoelectric effect equation. (2018, Jan 24). Retrieved from http://studymoose.com/13-3-einsteins-photoelectric-effect-equation-essay