Q1. (10 marks) Six spectral lines that belong to the fundamental series of the emission spectrum of sodium are observed at the following wavelengths (nm): 1846.40, 1268.27, 1083.75, 996.38, 948.22, 914.94 Assume that the quantum defects for the nf levels are negligible. (a) Determine the Rydberg constant for sodium (Rna) in the unit of cm'. (b) Using the 3s 3d separation of 29172.9 cm (ignore the spin-orbital splitting of the 3d level), estimate the ionization energy of sodium in the units of both cm' and eV. (c) Determine the value of quantum defect for the 3d level (83a) for sodium