Question: Q. 3. What is the maximum number of spectral lines emitted by a hydrogen atom when it is in the fourth excited state?
U [O.D. Comptt. I, II, III 2013]
Solution:
Ans. $n=5$
$$ \begin{aligned} & N=\frac{n(n-1)}{2}=\frac{5 \times 4}{2} \ & N=10 \end{aligned} $$
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