Photoelectric current is zero when the stopping potential is
sufficient to repel even the most energetic photoelectrons, with the
maximum kinetic energy (Kmax), so that
Kmax = e V0
(11 1)
We can now repeat this experiment with incident radiation of the same
frequency but of higher intensity I2 and I3 (I3 > I2 > I1) We note that the
saturation currents are now found to be at higher values This shows
that more electrons are being emitted per second, proportional to the
intensity of incident radiation