First slide

Quantum mechanical model of the atom

Question

When the electron of a hydrogen atom jumps from n = 4 to n =1 state, the number of spectral lines emitted is:

Moderate

Solution

$\begin{aligned} No. of spectral lines = \sum (n_{2} - n_{1}) \\ = \sum (4 - 1) = \sum 3 = 3 + 2 + 1 = 6 \end{aligned}$

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