The pH of a solution decreased by 2.0 how does the hydro imy ion concentration of the solution change ? Increases to 2 times the original concentration increases to 100 times the original concentration decreases to 1/100 of the original concentration decreases to 1/2 of the original concentration

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?