Question

A photon with a kinetic energy of 10^-3 eV is absorbed when a molecule makes a transition from a certain energy level to the next highest energy level. What kind of energy levels must those molecular energy levels be?

Answer 1

due to transistion of electrons from one energy level to another level visible radiation is produced.

when ever there is a absorption of photon in the range of 0.001ev then it is in the range of micro waves so when ever the photon of micro wave range is absoption then there is a change in the molecule which leads to the rotation of molecule.

This energy of photon is sufficient for the rotation of molecule.

so the energy levels involved in this case are rotational energy levels.