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Q. If an electron of hydrogen atom moves from fourth excited state to ground state in Lymen series find the total number of spectral lines?

NTA AbhyasNTA Abhyas 2022

Solution:

Total number of spectral lines $=\frac{n \left(n - 1\right)}{2}=\frac{5 \left(5 - 1\right)}{2}=10$