Chemistry and Chemical Reactivity (9th Edition)

$\Delta E=-Rhc(1/n_f^2-1/n_i^2)$ With $Rhc=2.179\times10^{-19}\ J, n_f=2, n_i=5$ $\Delta E=-4.58\times10^{-20}\ J$ Photon with this energy: $E=h\times\nu$ $\nu=6.91\times10^{13}\ 1/s$ $c=\lambda\times\nu$ $\lambda=4.34\times10^{-6}\ m$