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ⓛⓝⓘⓝⓖenergy of INCIDENT Photon ,E = hc/ lemda = 1242eV nm/ 300nm= 4.14 EV electron will be knocked out of the hydrogen ATOM if :-E > 13.6 eV electron will go to First excited state if :-E > energy of first excited state .so electron will keep orbiting in the ground state of atom .❤.❤



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