When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 , eV to 0.8 , eV . The work function of the metal is :-

1. A. 0.65 , eV
2. B. 1.0 , eV
3. C. 1.3 , eV
4. D. 1.5 , eV

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