NOISE POLLUTION

prepaid by:- Milind patel

Content Noise and sound Characteristics of sound Measurement of sound Effects of noise pollution Control of noise pollution

NOISE & NOISE POLLUTION.

• The word noise comes from the Latin word nauseas, meaning seasickness.

• Sound that is unwanted or that disrupts the activity or balance of human or animal life is called as noise. When

there is lot of noise in the environment, it is termed as noise pollution.

SOUND V’s NOISESOUND

Pleasant to hear Constant pitch Regular periodic motion Produces meaningful

communication Unit is Hertz (Hz)

Hz= cycle/sec.

NOISE

Unpleasant to hear Constantly varying pitch No regular periodic motion Produces no meaningful

communication Unit is decibel (dB)

dB=10 log(intensity measured/reference intensity)

CHARACTERISTICS OF SOUND

Frequency: Frequency is the no of cycles repeated in unit time duration. Its unit is cycle/sec or Hz(1Hz=1Cycle/sec)

Intensity: Amount of sound energy received / sec is known as intensity of sound. Its Unit is decibel(dB).

Amplitude and wavelength period

• Amplitude of wave ( A ) :

The amplitude of wave is the height of the peak or depth of the trough measured from zero pressure line.

• Wavelength :

The distance travelled by the sound wave during one time period is known as wavelength .

Sources of noise pollution

• Traffic source

• Industrial sources

• Constructional sources

•Other sources

Traffic source

Transportation systems are the main source of noise pollution in urban areas. It may be in the form of : Horn of vehicles Raise of accelerator Vehicle with damaged silencer Noise produced by a diesel car A jet aircraft

Industrial sourcesIndustrial noise also adds to the already unfavorable state of noise pollution.

Industrial noises are usually produced by : Reciprocating or rotating

machinery Cutting of materials, grinding Blow hammers generators High pressure and high velocity

gases, etc.

Constructional sourcesNoise produced by various constructional activities are : Rock crushers for production of

aggregate Pile driving equipments Road rollers Materials handling by belt

coveyors, chute, hoist Rock blasting

Effects of Noise Pollution

• Physical effects

• Physiological effects

• Psychological effects

Physical effects:

Loss of hearing Total deafness Sudden loudness

particularly from crackers and explosions may affect the ear drum and sensitive ear membrances .

Physiological effects- Headache , nausea

Dizziness , gastric ulcers

High rate of heart beat

Fluctuations in blood pressure and sugar

Psychological effects Annoyance , sleep

interference Depression , fatigue Mental stress Speech interference Decrease in efficiency

CONTROL OF NOISE POLLUTION

TREE PLANTATION: Effective solution for

noise pollution is to plant bushes and trees around the sound generating sources. Sound passage is blocked by the dense shrubs and trees. Trees can be planted in the surrounding area to live peacefully.

SOUNDPROOF HOMES:  To block unwanted

noise from outside soundproof doors and windows can be installed. If you stay in crowded city area these soundproof options are important for complete relaxation.

LOUDSPEAKER PROHIBITION:  The major cause of noise

pollution in public areas is loudspeaker. For the welfare of the people it should be banned at any cost. Those who violate and play loudspeakers in crowded areas and public places strict laws should be imposed against them.

WHITE NOISE MACHINE

For overcoming the effects of noise pollution the latest technology is using white noise machine. This device converts the unbearable noise into pleasant sound. A white noise machine is placed between the source of noise and the receptor. It produces soft sound like that of a waterfall, fan and soft music.

Noise pollution at home is caused by using music systems and television sets with high volumes. Instead of using these appliances with the high volume, it is better to keep it at a moderate level.

Similar to automobiles, lubrication of the machinery and servicing should be done to minimize noise generation