presentation 1 poluarea fonica
DESCRIPTION
l Sound is a form of energy which is enited by a vibrating body and on reaching the ear causes the sensation of hearing through nervesTRANSCRIPT
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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 .
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Noise may beLow frequencyHigh frequency
Which is undesired for a normal hearing
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Places where we meet noise can be:Indoor
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Outdoor
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Noise measurementThe intensity of sound is measured in sound pressure level(SPL) and the common unit of measurement is decibel(dB).
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Sources of noiseDomestic:-movement of utensils-cutting and pealing fruitsor vegetables
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Natural(bird/animal shouts,water falls,waves)
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Comercial(cars,airplanes,machinery)
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Industrial(generator sets,pumps,motors)
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Impact of noiseWhy bother about noise?
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Noise effectsAnnoyanceLoss of hearingHuman performanceSleeplessness Nervous sistem
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Can we control the noise?Yes
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How?By :-controling the source
-controling the transmition path
-using protective equipment
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Thanks for listening