(a) Suppose an unknown element has a absorption spectrum with lines at 2.5, 4, and 5.1eV above its ground state and an ionization energy of 11.5eV. Draw an energy level diagram for this element.
(b) If a 5.1-eV photon is absorbed by an atom of this substance, in which state was the atom before absorbing the photon? What will be the energies of the photons that can subsequently be emitted by this atom?