Two oscillators will strongly interact when their energies are equal.

If the energies are different, they will not strongly interact!
We can use electromagnetic radiation to probe atoms and molecules to find what energies they contain.
Module 5 : Modern Characterization of materials
Lecture 30: Routine Characterization tools Infrared Spectroscopy
Two oscillators will strongly interact when their energies are equal.

If the energies are different, they will not strongly interact!
We can use electromagnetic radiation to probe atoms and molecules to find what energies they contain.