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]

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Solution:

Ans. $n=5$

$$ \begin{aligned} & N=\frac{n(n-1)}{2}=\frac{5 \times 4}{2} \ & N=10 \end{aligned} $$

? Short Answer Type Questions-I



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