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Using Bohr's postulates, derive the expression for the frequency of radiation emitted when electron in hydrogen atom undergoes transition from higher energy state (quantum number \( n_{i} \) ) to the lower state,
P \( \left(n_{\mathrm{f}}\right. \) ). When electron in hydrogen atom jumps from energy state \( \mathrm{n}_{\mathrm{i}}=4 \) to \( \mathrm{n}_{\mathrm{f}}=3,2,1 \), identify the spectral

W series to which the emission lines belong.
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