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When light of frequency f is shined on a given metal, electrons of maximum kinetic energy...

When light of frequency f is shined on a given metal, electrons of maximum kinetic energy of 3.25 eV are ejected from the metal. When light of frequency 4f is shined on the same metal, electrons of maximum energy 15.65 eV are ejected from the metal.

Question: What is the work function of the metal?

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