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When light of wavelength 800A illuminates a metal the most energetic photoelectron emitted can just...

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When light of wavelength 800A illuminates a metal the most energetic photoelectron emitted can just ionise the hydrogen atom in ground state What is the work function of the metal approximately 1 1 2 eV 2 1 9 eV 3 3 4 eV 4 4 8 eV

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