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