ABSTRACT
Vibration refers to mechanical oscillating movements of an object from its equilibrium position. Sound to human ears is aphysiological response to aphysical phenomenon of periodically oscillating pressure waves in acertain range. In fact, vibration and sound are closely related to each other. Vibrating objects such as electric motor with random oscillatory movement can produce sound and it travels as acoustic waves through various mediums such as air and water. Sound waves radiate outward from the sound sources in all directions.
