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A tube contains a sample of hydrogen ato...

A tube contains a sample of hydrogen atoms which are all in their third excited state. The atoms de-excite and a spectrum of the radiation emitted is obtained. The spectrum is shown in the given figure.

(a) Which of the lines (`1, 2, 3, 4, 5` or `6`) represent a transition from quantum state `n = 3` to `n = 2`.
(b) Which of the lines represent the one with second smallest wavelength?

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