The wavelength of the second line in the Brackett series of a hydrogen atom is: (RH = 1.097 × 10⁷ m⁻¹)
Brackett: n₁=4, n₂=6. λ = 2625 nm.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Shapes of Orbitals - s p d f and Nodes and Radial Probability