Question

define frequency.Name some source of noise pollution

Answer 1

the rate at which a vibration occurs that constitutes a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light), usually measured per second.

sources:
1)huge volume of sound
2) frequently hornong of a vehicles

Answer 2

number of vibrations produced in 1 min is known as frequency.

major sources of noise pollution includes -

speakers
planes
electronic gadgets like - mixer
tv
automobiles . etc...