Whenever a hydrogen atom emits a photon in the Balmer series

Options

A. may emit another photon in the Paschen series
B. need not emit any more photon
C. may emit another photon in the Balmer series
D. must emit another photon in the Lyman series.

Answer

D

Explanation

A hydrogen atom emit a photon in the Balmer series. When the electron jumps from excited state `(ngt2)` to the lower energy state corresponding to the principal quantum n=2. but still it is in excited state and it tries to emit another photon to reach the ground state (n=1) where the energy is least. therefore, it must emit another photon in the Lyman series.