1. The problem statement, all variables and given/known data An incident light shines on a mercury metal plate with a work function of -4.5 eV. The stopping voltage is observed to be -1.65 volts. What is the wavelenght of the incident light? 2. Relevant equations wavelength=hc/E-0(it's a Greek sign n i dont have it in my computer) 3. The attempt at a solution (4.14 X 10^-15 eVs) (3 X 10^8 m/s) / 1.65 + 4.5 = 1.242 X 10^-6 / 6.15 1.242(10^2)/6.15 = 20.1954 but the right answer is 201.7561 nm so can anyone please tell me what did I do wrong?