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  4. No. of visible lines when an electron returns from 5th orbit up to ground state in H spectrum:

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Q. No. of visible lines when an electron returns from $5^{th}$ orbit up to ground state in $H$ spectrum:

Structure of Atom

Solution:

Number of visible lines when an electron returns from 5 th orbit to the ground state in the $H$ spectrum is 10.
The number of spectral lines $=\frac{ n ( n -1)}{2}$.
The number of spectral lines $=\frac{5(5-1)}{2}=10$.
These lines belong to the UV region.
Note: Lyman series corresponds to transitions to $n =1$ level.