When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occur by incidence of :-
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Alkali metals, viz, lithium, sodium, potassium shows photoelectric effect even with visible light. Photo-electric emission depends on the work function 
of the metal surface. If the frequency 
of the incident ray is less than certain frequency 
known as threshold frequency, no photoelectric effect is possible. 
, is different for different materials.
Therefore, when ultra-violet rays fail to emit photoelectrons, rays like X-rays with higher frequency should be used.
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