Two radiations of photons energies 1 eV ...

Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is -

`1 : 4`

`1 : 2`

`1 : 1`

`1 : 5`

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