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Question:

The electron in the hydrogen atom undergoes transition from higher orbitals to orbital of radius 211.6 pm. This transition is associated with: Brackett series, Lyman series, Paschen series, Balmer series

Paschen series

Lyman series

Balmer series

Brackett series

Solution:

For hydrogen atom, the radius of nth orbit, rn = 52.9 pm × n2
211.6 pm = 52.9 pm × n2
n2 = 4
n = 2
Hence, the transition is from a higher orbit to the second orbit. This corresponds to the Balmer series.