Wave motion 2. A series of minute particles called photons.
Light has energy associated with it.
Frequency light x h, where h is called Planck's constant and has a value of 6.6 x 10 -27 erg . Radio frequency B. Principles of Absorption Spectroscopy 1. A molecule contains energy. The energies levels in a molecule can be changed in various ways. A molecule can absorb only energy of certain amounts, the absorbed energy must cause some discreet change in the energy levels within the molecule.