1. The problem statement, all variables and given/known data In a particular photocell, light with a frequency of 8×10^14Hz is directed onto the cell and it is found that a stopping potential of 1.2V is needed to reduce the photoelectric current to zero. Calculate the work function of the metal in the cell. 2. Relevant equations E=hf E=hc/λ hf=[itex]\phi[/itex] + Ek 3. The attempt at a solution Not much luck with this. Most sources that calculate the work function require the threshold frequency first, but we don't have that. Using E=hf and E=hc/λ I managed to find the energy of the light/photon as 5.304×10^-19 and the wavelength to be 3.725×10^-7 but now I'm stuck.