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