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Sound
A form of energy
Longitudinal wave
Compression size indicates how much energy the sound waves have.
Functions of the Ear
Hearing and Balance
Decibel (dB)
Unit for intensity or loudness of sound.
Faint
0 db - 40 db
Moderate
50 db - 60db
Loud
70 db
Very Loud
80 db - 100 db
Extremely Loud
110 db - 140 db
At what decibel can your ears tolerate up to?
91 Decibels
At what decibel can damage occur within 15 minutes of exposure?
100 Decibels
At what decibel can damage can occur with only one minute of exposure?
112 Decibels
At what decibel can cause immediate nerve damage?
140 ecibels
Transportation
Consists of surface transport vehicles (air and land) and traffic conditions.
Commercial and Industrial
Printing press, manufacturing industries, construction and machineries (textile mills, conveyors, etc.)
Household
Includes home appliances like radio
Military
Consists of explosives
Physical Effect
Ruptured Eardrum
Physiological Effect
Headache by dilating blood vessels of the brain.
Increase of heart rate
Narrowing of arteries
Fluctuations in the arterial blood pressure
Decrease in heart output
Pain in the heart
No effects
Up to 23 Decibels
Stress, tension, psychological effects especially at the upper range, delay or interference with sleep resulting in fatigue.
30 to 60 Decibels
Damage to health, psychological and vegetative (disturbance in stomach-gall functions, pains in muscles, high blood pressure, disturbance in sleeping)
60 to 90 Decibels
Damages to health and ontological (ear diseases) effects
60 to 120 Decibels
Painful effects in long run, traumatic hearing loss and physical damage inside the ear.
Above 120 Decibels
