1. The problem statement, all variables and given/known data I have to calculate the frequency of incident light shot at a metal plate. 2. Relevant equations I know the voltage, intensity, and wavelength. wavelength = velocity/frequency frequency = velocity/wavelength voltage = current • resistance 3. The attempt at a solution There isn't any specific math involved in this problem, really. I mean, there is because I have the data in a chart that I made after having to experiment with incident light and different kinds of metal plates observing the photoelectric effect. All I need to know in order to finish the table and data by myself is how to get the frequency when I have the intensity, wavelength, and voltage. I don't have a velocity, unless I want to use the velocity of light, which I'm considering. Is it even possible to use the voltage in such calculations to end up at the frequency? I don't think the voltage has a whole lot to do with frequency of incident light. Input is greatly appreciated!