Atoms And Nuclei

The radius of the orbit of an electron in a hydrogen-like atom is 4.5a₀, where a₀ is the Bohr radius. Its orbital angular momentum is \({{3h} \over {2\pi }}\). It is given that h is Planck constant and R is Rydberg constant. The possible wavelength(s), when the atom de-excites, is(are)