Question

During the transition from $5^{\text{th}}$ excited state to $1^{\text{st}}$ excited state, the total number of spectral lines in UV region is:

• A. $10$
• B. $3$
• C. $4$
• D. 0.0

Answer 1

The correct option is D 0.0

The spectral lines in the UV region are given by the Lyman series, which considers the transition of electrons from the higher excited states $(n=2,3,4\dots )$ to the ground state $(n=1)$.
However, the question refers to the transition from the $5^{th}$ excited state $(n=6)$ to the $1^{st}$ excited state $(n=2)$ and not the ground state $(n=1)$.
Hence, such a transition will produce zero spectral lines in the UV region.