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A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy ...

A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy of 2eV are ejected. The work function of the metal is

A. 0.4eV
B. 2.5eV
C. 3.0eV
D. 7.0eV




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