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Using Bohr's postulates, derive the exp...

Using Bohr's postulates, derive the expression for the frequency of radiation emitted when electron in hydrogen atom undrgoes transition from higher energy state (quantum number `n_i`) to the lower state (`n_f`).
When electron in hydrogen atom jumps from energy state `n_i=4` to `n_f=3,2,1` , identify the spectral series to which the emission lines belong.

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