When monochromatic photons incident on a photosensitive material of cut-off wavelength \(496\,\mathrm{nm}\), photoelectrons are emitted with a maximum velocity of \(8\times10^5\,\mathrm{m\,s^{-1}}\). Then the energy of the incident photons is nearly
\[
\left(m_e=9\times10^{-31}\,\mathrm{kg},\; e=1.6\times10^{-19}\,\mathrm{C}\right)
\]