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When hydrogen atom is excited, it returns to its normal unexcited (or ground state) state by emitting the energy it had absorbed earlier. This energy is given out by the atom in the form of radiations of different wavelengths as the electron jumps down
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Spectral series
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The spectral lines arising from the transition of electron forms a spectra series.
(i) Mainly there are five series and each series is named after it's discover as Lymen series, Balmer series, Paschen series, Bracket series and Pfund series.
(ii) According to the Bohr's theory the wavelength of the radiations emitted from hydrogen atom is given by 
where n2 = outer orbit (electron jumps from this orbit), n1 = inner orbit (electron falls in this orbit)
(iii) First line of the series is called first member, for this line wavelength is maximum (λmax)
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(iv) Last line of the series (n2 = ∞) is called series limit, for this line wavelength is minimum (λmin)
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