A sound becomes noise when it causes disturbance to the hearer. Noise is measured in units of decibel. Loud noise may be cause direct injury to the auditory organs resulting in deafness. Permanent deafiness may be caused by exposure to sudden noise of an explosive nature. Temporary deafiness may occure after exposure to a light intense sound from jet engine. It has been observed that normal development of infants is interfered with by constant loud noise. Noise interfered with restful sleep. Onset of cardiovascular and cerebrovascular syndromes has been associated with disturnbance by noise.
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