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all elements are not photoelectric? why?
In Einstein's model, increasing the intensity of the incident radiation would cause greater numbers of electrons to be ejected, but each electron would carry the same average energy because each incident photon carried the same energy. This assumes that the dominant process consists of individual photons being absorbed by and resulting in the ejection of a single electron.Likewise, in Einstein's model, increasing the frequency f, rather than the intensity, of the incident radiation would increase the average energy of the emitted electrons.As the alkali metals have lowest values for the first ionisation potential ,these metals best exhibit the photeelectric effect.


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