Noise is an unpleasant / unwanted sound Sound is a form of energy which is emitted by a Vibrating body and on reaching the ear causes the sensation of hearing through nerves. Sounds produced by all vibrating bodies are not audible. The frequency limits of audibility are from 20 HZ to 20,000 HZ. Types of noise Continuous Impulse Side effects of noise Loss of hearing Stress Accidents Behavioural effects Noise Hazard Symbol Negative impact on health