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  4. According to the Bohr theory of the hydrogen atom, electrons starting in the 4 text th energy level and eventually ending in the ground state could produce a total of how many lines in the hydrogen spectra?

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Q. According to the Bohr theory of the hydrogen atom, electrons starting in the $4^{\text {th }}$ energy level and eventually ending in the ground state could produce a total of how many lines in the hydrogen spectra?

Atoms

Solution:

Number of lines in emission spectrum
$=\frac{n(n-1)}{2}=\frac{4(4-1)}{2}=6$