Excited hydrogen atom emits light in the ultraviolet region at $2.47\times10^{15}\,\mathrm{Hz}$. With this frequency, the energy of a single photon is: ($\mathrm{h}=6.63\times10^{-34}\,\mathrm{Js}$)\\
(1) $8.041\times10^{-40}\,\mathrm{J}$\\
(2) $2.680\times10^{-19}\,\mathrm{J}$\\
(3) $1.640\times10^{-18}\,\mathrm{J}$\\
(4) $6.111\times10^{-17}\,\mathrm{J}$