Question

State Bohr’s quantisation condition of angular momentum. Calculate the shortest wavelength of the Brackett series and state to which part of the electromagnetic spectrum does it belong.

Answer 1

Bohr’s quantisation condition: Only those orbits are permitted in which the angular momentum of the electron is an integral multiple of h/2π.

For Brackett Series.

Shortest wavelength is for the transition of electrons from

n₁ = ∞ to n_f = 4

Using the equation