1. The problem statement, all variables and given/known data I need to calculate the work function of a photoemissive material. Light is shone through a photocathode (cathode) and the stopping potential V, is measured between anode (stainless steel) and cathode using a picoammeter) Following are the data measured/calculated ν = 1.402 e15 Hz (deuterium lamp, at λ= 214nm) hν = 5.798 eV stopping potential, V = 2.44 v ϕ (anode) = 4.4 eV (stainless steel) 2. Relevant equations E = hc/λ = hν hν = ϕ + Ek 3. The attempt at a solution How do I calculate the ϕ (cathode)? Is the formula ϕ (cathode) = hν + V - ϕ (anode) correct? stopping potential V is measured in volts, everything else in the above equation is in eV. Any solutions?