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Explain, with the help of an appropriate labelled sketch diagram, how a hydrogen atom, which has only one electron, has so many spectral lines.

The diagram of the energy levels follows:
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An electron may reside in any of the energy levels. When it falls to a lower level, light is emitted with an energy that is the difference between the two energy levels. There are many energy levels and many combinations from which the electron can fall "from/to" so there are many different wavelengths emitted by the single electrons.

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