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There may be a peak or peaks in your spectrum for which you are unable to...

There may be a peak or peaks in your spectrum for which you are unable to assign a transition in the Balmer series. What might such an unknown peak be due to?

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When we record any spectrum, there will be some unwanted peaks due to electric or electronic or surrounding disturbances. This is called noise. Balmer series is formed in visible light region during the electronic transition between two energy levels. So, if you observe a peak in visible region and it it's energy is not equal to the difference in any two energy levels of the atom for which the spectrum has been studied, then we can not assign the peak to balmer series of that atomic spectrum.

So,

Here such an unknown peak could be due to the surrounding light.

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