One question type in exams is to ask what kind of plot correctly depicts
the relationship between the electron current and frequency of light,
assuming that the frequency is above the critical frequency for a given
metal. The standard answer is that the current is constant w.r.t.
frequency. For instance, the Khan Academy
(https://www.khanacademy.org/science/physics/quantum-physics/photons/a/photoelectric-effect)
explains it thusly:
"Because the light amplitude was kept constant as the light frequency
increased, the/number/of photons being absorbed by the metal remained
constant. Thus, the rate at which electrons were ejected from the metal
(or the electric current) remained constant as well. The relationship
between electron current and light frequency is illustrated in graph (b)
above."
However, when the situation is run using the Phet simulation, the
current doesn't stay constant: it increases when the frequency of light
increases (that is, the wavelength decreases).