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What is noise pollution? What are its major causes?

Presence of excessive or unwanted sounds in the atmosphere is called noise pollution. Major cause of noise pollution are sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers etc.

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41 How does the loudness of sound depend upon the amplitude? Explain giving example. 42 What is the unit of the loudness of sound? Explain giving the loudness of few sounds. 44 What sources in the home may lead to noise? 45 What are the harms of noise pollution?