1. The problem statement, all variables and given/known data So today in class we did a lab where we calculated the stopping voltage of lights of different wavelengths. We did this experimentally. I have the wavelength, frequency, and stopping voltage of four different lights. I need to calculate the work function of the material, and Planck's constant. 1) Every time I calculate the work function, it comes out different for each wavelength. Am I supposed to be getting the same work function for each light? 2) How could I calculate Planck's constant, isn't it a constant? Please help! Thank you. 2. Relevant equations Work Function: hc/lambda minus the stopping voltage of the electron Planck's constant: 4.1 x 10^-15 c=3.0 x 10^8 3. The attempt at a solution Various work functions I've gotten have included 1.46 eV, 1.53 eV, and 1.76 eV.