Work function of aluminium is $4.2 e V .$ If two photons, each of energy $2.5 e V,$ are incident on its surface, will the emission of electrons take place ? Justify.

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Solution

No, there won't be any photon ejection, no photoelectric effect will take place, because energy of individual photon is less than work function $(i . e . 2.5 < 4.2)$ , although combined energy is greater but only one photon give energy to an electron

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