Why some metal show photoelectric effect under visible light?
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only metals have 'spare' electrons available in their outer shells. It is those 'spare' electrons which are able to be dislodged by the occasional passing photon provided that the photon has sufficient energy. The energy of the photon is determined by the frequency of the radiation - and that also determines the colour if it is visible light - blue having more energy than red. Given all that, some non metals - mostly in the metalloid group - can exhibit weak photoelectric effects if the energy of the impeding photons is high enough
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