Question

Total number of spectral lines in UV region, during transition from $5^{\text{th }}$ excited state to $1^{\text{st }}$ excited state

• A. 10
• B. 3
• C. 4
• D. Zero

Answer 1

Answer: (D)

As $1^{\text{st }}$ excited state means $n_1=2$
For $5^{\text{th }}$ excited state means $n_2=6$
$\therefore e^{-}$will transit between $6^{\text{th }}$ level to $2^{\text{nd }}$ level
No transition will be upto 1st level. Because no line will appear in Lyman series i.e. UV region.