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An electromagnetic radiation whose electric component varies with time as E Eo 1 coswt cos wot w 6 x 10 5 rad s wo 2 8 x 10 4 rad s is incident on a lithium surface work function 2 39 eV The maximum kinetic energy of a photoelectron liberated from the lithium surface is h 4 14 xx10 15 eV s
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