Question

Why do only discrete frequencies appear in atomic emission spectra?

Options

• Because quantum numbers are integers, only discrete energy differences are possible

• Because atoms can only emit light in the visible range

• Because photons can only travel in straight lines

• Because the intensity of emission varies continuously

Answer 1

Since quantum numbers (ni and nf) are integers, the allowed energy levels are discrete. Therefore, the energy differences (Eni − Enf) between these levels are also discrete, resulting in photons of only specific frequencies rather than a continuous spectrum.