Question

noise pollution.......​

Answer 1

Noise pollution

Noise pollution, also known as environmental noise or sound pollution, is the propagation of noise with harmful impact on the activity of human or animal life. The source of outdoor noise worldwide is mainly caused by machines, transport and nowdays crackers also create too much of noise pollution.noise level up to 90 dB does not have any appreciable effect. Exposure in excess of 115 dB is not permitted with unprotected ears as it runs the risk of hearing impairment.

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Answer 2

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Here points on sound and noise

(1) Sound is produced by vibrating objects.

(2) In humans beings, the vibration of vocal cords produces sound.

(3) Sound travels through a medium gas , liquid or solid and sound can't travel in vacuum.

(4) The eardrum seses the vibration of sound it sends tge signals to the brain .this process is called hearing.

(5) The number of oscillations or vibrations per seconf is called frequency if oscillation.

(6) The frequency is expressed in hz which means hertz.

(7) Excessive or unwanted sounds lead to noise pollution.Nosise pollution may pose health problems for humans.

(8) Plantation on the roadside and elsewhere can reduce noise pollution.

(9) Unplesant sounds are called noise.

(10) Larger the amplitude of vibration ,the higher is the pitch and shriller is the sound.