Question

Calculate the wavelength, λ, in meters of a photon capable of exciting an electron in He+ from the ground state to n = 4.

Answer 1

The wavelength that is emitted or absorbed due to the difference between the energy levels for an electron in a hydrogen-like atom is given by\[\frac1\lambda=RZ^2\left(\frac1{n_1^2}-\frac1{n_2^2}\right)\] where n1 and n2 are the different energy levels, and R is the Rydberg constant, and Z is the atomic number.