What is the pH of a solution containing 0.91 M ethanoic acid (Ka = 1.76 x10-5) and 0.23 M sodium acetate?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?