Lattice dynamics is an essential component of any graduate course in physicals and material science. In particular it is essential for understanding the interaction of electromagnetic waves and crystalline solids. In general, students find it difficult to understand concepts like acoustic mode, optical mode, energy gap etc, which they cannot see for themselves in the laboratory. Here a laboratory exercise is described in which the student follows a carefully prescribed procedure which presents him with simplified model of the system and allows him to verify well established theories. The exercise is valid for the study of dynamics of mono and diatomic lattices.