Pfund series are produced in the spectrum of hydrogen atom

Q. Pfund series are produced in the spectrum of hydrogen atom

A.            when electrons jump down to 2nd- orbit              

B.            when electrons jump down to 3rd- orbit

C.            when electrons jump down to 4th- orbit

D.            when electrons jump down to 5th- orbit

Answer: when electrons jump down to 5th- orbit

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