Electron in hydrogen atom first jumps from third excited state to second excited

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths λ₁:λ₂ emitted in the two cases is

Options

(a) (7/5)
(b) (27/20)
(c) (27/5)
(d) (20/7)

Correct Answer:

(20/7)

Explanation:

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