Question

An electron in Li2+ falls from n = 2 to the ground state. Calculate the wavenumber, (νˉ), of the emitted photon.

Answer 1

74300000

Answer 2

Just use Rydberg equation\[1/λ=R∗Z ^{2}∗(1/n _{1}^{2}−1/n _{2}^{2})\]

wave number is nothing but 1/λ. So you get the answer directly.

Answer 3

74047500