A photosensitive metallic surface has work function, $hv_0$. If photons of energy $2hv_o$ fall on this surface, the electrons come out with a maximum velocity of $4\times10^6$ m/s. When the photon energy is increased to $5hv_0$, then maximum velocity of photo electrons will be

Question

( A ) $2\times10^7m/s$
( B ) $2\times10^6m/s$
( C ) $8\times10^6m/s$
( D ) $8\times10^5m/s$