1. The problem statement, all variables and given/known data HI, I have this photoelectric effect problem, it is not so difficult but when i got to the units and red about it , i got confused. The Problem : Photo-electrons are completely hold up by electric potential with potential of 3V. The work function is given. I have to calculate the incident light frequency. 2. Relevant equations 3. The attempt at a solution So the equation is Emax=hfinc-φ And the units are [V]=[J]-[J] This does not work. So I thought lets convert them to eV which is possible for [J]. But when I start to think about the V -> eV its gets confusing because V are not measurement of energy but eV are. So what do you think guys, can I just do the conversion from [v] to [ev] by multiplying V by e or it is wrong?