define threshold energy and work function
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The minimum energy needed to eject an electron from a metal is known as the work function of the metal. Work function is different for different metals.
A photon having an energy at least equal to the work function can eject electron from the metal, frequency of such a photon whose energy is just equal to the work function is called threshold frequency.
Electrons are, therefore, emitted only if the frequency of the photon is greater than the threshold frequency
A photon having an energy at least equal to the work function can eject electron from the metal, frequency of such a photon whose energy is just equal to the work function is called threshold frequency.
Electrons are, therefore, emitted only if the frequency of the photon is greater than the threshold frequency
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