Light of two different frequencies whose...

Light of two different frequencies whose photons have energies 1eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum kinetic energy of emitted electrons will be:

`4 : 1`

`1 : 4`

`1 : 2`

`2 : 1`

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