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Emission transition in the Paschen serie...

Emission transition in the Paschen series end at orbit n = 3 and start from orbit n and can be represented as
`nu = 3.29 xx 10^15 (Hz) [1//3^2 - 1//n^2]`
Calculate the value of n if the transition is observed at 1285nm. Find the region of the spectrum.

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