Question
Balmer series was observed and analysed before the other series. Can you suggest a reason for such an order?

Answer

The Balmer series lies in the visible range. Therefore, it was observed and analysed before the other series. The wavelength range of Balmer series is from 364nm $(\text{for n}_2=\infty)$ to 655nm (for $n_2 = 3$).

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