Geography
With reference to noise pollution, answer the following:
How do the airplanes cause noise pollution? Why is there more noise pollution during landing as compared to during take-off?
Pollution Sources
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Answer
The airplanes cause noise pollution as the noise made by the jet planes is more disturbing than that of the old propeller driven aircraft because it is of far higher pitch. Jet noise is caused by the violent mixing of the jet of gases from the engine with the surrounding air. It is at maximum level during take-off when the engine delivers maximum thrust, and reduces rapidly as the aircraft climbs.
During landing, the main source of high-frequency noise is the sound made by the air compressor and turbine blades. Air crafts pass close to the ground for quite a distance during landing operation and this noise often constitutes a more sustained environmental nuisance than the intense noise of shorter duration produced during take-off. Hence, there is more noise pollution during landing as compared to during take-off.
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