Given that the energies of the ground and excited states of the Hydrogen atom may be calculated using E=(-13.6eV)/n² and that Planck's constant is h=6.626 x 10^-34Js and 1eV=1.602 x 10^-19 J, find the wavelength of the x-ray emitted when a Hydrogen atom initially in the n=4 excited state decays to the ground state.