Light of wavelength 692.8 nm is absorbed by cone cells in the retina which your brain interprets as a color. Different color absorption can be modelled as different photoreceptor molecules contained inside the cone cells having a different "box" sizes. Light of this wavelength is absorbed by a transition of an electron in the cone cell from its n = 1 state to its n = 2 state. Find the length of the photoreceptor molecule inside the cone cell.