If an electron transition involves 4.91×10^−19 J of energy, what is the wavelength (in nm) of the photon that is emitted? Planck's constant is 6.63×10^−34 J-s and the speed of light is 3.00×10^8 m/s

If an electron transition involves 4911019 J of energy what is the wavelength in nm of the photon that is emitted Plancks constant is 6631034 Js and the speed o class=