> If light were a wave that carried energy, this wouldn’t explain why an equal amount of energy has a different effect depending on its wavelength. Not by itse

> If light were a wave that carried energy, this wouldn’t explain why an equal amount of energy has a different effect depending on its wavelength. Not by itself but the accompanying theory - classical EM theory - does explain why different frequencies interact differently. Absorption/dispersion spectra are well described by wave theory. What the classical wave theory can't explain easily are coincidence counts in extremely weak light (antibunching), or things such as the Compton scattering.