What is sound?Sound is a form of energy which is enited by a vibrating body and on reaching the ear causes the sensation of hearing through nerves .
Noise may beLow frequencyHigh frequency
Which is undesired for a normal hearing
Places where we meet noise can be:Indoor
Outdoor
Noise measurementThe intensity of sound is measured in sound pressure level(SPL) and the common unit of measurement is decibel(dB).
Sources of noiseDomestic:-movement of utensils-cutting and pealing fruitsor vegetables
Natural(bird/animal shouts,water falls,waves)
Comercial(cars,airplanes,machinery)
Industrial(generator sets,pumps,motors)
Impact of noiseWhy bother about noise?
Noise effectsAnnoyanceLoss of hearingHuman performanceSleeplessness Nervous sistem
Can we control the noise?Yes
How?By :-controling the source
-controling the transmition path
-using protective equipment
Thanks for listening
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