Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively, illuminate a metal of work function 0.5 eV. The ratio of the maximum KE of the emitted electrons will be:

$1: 5$ $1: 4$ $1: 2$ $1: 1$

$1: 4$

The correct answer is Option (2) → $1: 4$