A photoelectron is an electron that was hit by a photon, causing it to flow. You can calculate for the kinetic energy of the photoelectron by subtracting the work function from the energy or frequency of the photon before hitting the electron.
The work function is the minimum amount of energy required to release an electron from the metal it was originally on.
Word problems regarding the photoelectric effect might give you the wavelength of the photon, which is different from the frequency. Wavelenth is the distance between each crest or valley in a wave. Frequency is how long it takes for each wavelenth to pass.
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