A 87.7 pm photon hits a metal and an electron with 567 eV of kinetic energy is released. Calculate the binding energy in J of the electron.

• A. 9.08^-17 J/photon
• B. 567 J/photon
• C. 2.18x10^-15 J/photon
• D. 2.27x10^-15 J/photon

Answer: (C)