Two identical photo-cathodes receive light of frequencies f1 and f2. If the maximum speeds of the photo electrons (of mass m) coming out are respectively v1 and v2, then what can be concluded?
1) The frequency of the light has no effect on the maximum speed of the photo electrons
2) The maximum speed of the photo electrons is directly proportional to the frequency of the light
3) The maximum speed of the photo electrons is inversely proportional to the frequency of the light
4) The maximum speed of the photo electrons is independent of the mass of the electrons
