The Paschen series in the hydrogen emission spectrum is formed by electron transitions from ni > 3

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The Paschen series in the hydrogen emission spectrum is formed by electron transitions from ni > 3 to nf = 3. 

(a) What is the longest wavelength in the Paschen series? 

(b) What is the wavelength of the series limit (the lower bound of the wavelengths in the series)? 

(c) In what part or parts of the EM spectrum is the Paschen series found (IR, visible, UV, etc.)?

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