What are the basic laws of the photoelectric effect?

There are three laws of the photoelectric effect, formulated by A.G. Stoletov.
First law: saturation photo flux is directly proportional to the incident light flux.
The second law: the maximum kinetic energy of photoelectrons increases with the frequency of the incident light flux according to a linear law and does not depend on its intensity.
The third law: for each substance there is a maximum wavelength at which the photoelectric effect is still observed. At wavelengths longer than the maximum, there is no photoeffect.

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