So, I understand that the intensity should be the only factor increasing the current as the answer to a similar question (Photoelectric Effect - Dependence of current on frequency) wisely explained, assuming that the Cathode, from which the electrons are leaving, is kept at a lover or same potential as the anode. If it was the opposite case However, as far as I know and the simulator shows, current would depend on the voltage because not every released electron would reach the anode because of the braking electric field.
My actual question however is: Can anybody explain me why does the PhET simulator (http://phet.colorado.edu/en/simulation/photoelectric) show that current does depend on frequency, but not seemingly linearly. The current on a constant intensity seems to reach its peak at the wavelength of 196nm corresponding the frequency of 1,53 x 10^15 Hz, which is UV.
I even made some rough measurements on the amount of electrons leaving the cathode in 20 second interval. My result was: At the wavelength of 196nm 21 electrons were released. At 345nm only 13 electrons were released.
So my point here is that we are told that the current doesn't depend on the frequency, furthermore the amount of electrons released from cathode doesn't depend on frequency. Is there something wrong in my measurements or does the simulator take something into account that a basic school book doesn't tell?