Question

An electron in excited hydrogen atom falls from fifth energy level to second energy level. In which of the following regions, the spectrum line will be observed and is part of which series of the atomic spectrum?

• A. Visible, Balmer
• B. Ultraviolet, Lyman
• C. Infrared, Paschen
• D. Infrared, Brackett

Answer 1

Answer: (A)

Visible, Balmer

Transition of an electron from excited state to lower energy states in the emission spectra of Hydrogen atom shows following series/region:

(i) Lyman series: $n_1=1$, $n_2=2,3,4,\mathrm{5..}$ region is-Ultraviolet

(ii) Balmer: $n_1=2$, $n_2=3,4,5,\mathrm{6..}$ region is-Visible

(iii) Paschen: $n_1=3$, $n_2=4,5,6,\mathrm{7..}$ region is-Infrared

(iv)Brackett: $n_1=4$, $n_2=5,6,7,\mathrm{8..}$ region is-Infrared

option A