10th question please

Q10. A graph is drawn between stopping potential (y – axis) and incident frequency (x–axis). The intercept. OA on x-axis gives 0.5 × 10¹⁵ HZ. The K.E. of photo electron emitted from the metal when the energy of incident photon is 5e V is. 

  1) 7 eV                            2) 3 eV                           3) 1.5 eV                    4) 6 eV