Β decay of U
γ decay of Po
ά and γ decay of Th
nuclear fusion of H and C
ά- decay of Plutonium-245
C + H
Po H He

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?