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Waves

Sound - Human Hearing.

Sound frequencies between 20 and 20,000 Hz can be heard by people.
As people get older, the higher frequencies become more difficult to hear.

Hearing can be damaged by being close to very loud sounds
over a long period of time.
Hearing very loud machinery or music when you are young
can result in less sensitive hearing when you are older.

Unwanted sound is sometimes called noise pollution.
Noise pollution can cause serious distress.
If you live near an airport or railway,
the noise can be reduced by having good double glazing in the windows.
If someone is working with noisy power tools, they can wear ear defenders
(which look like headphones or ear muffs).

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Copyright © 2007 Dr. Colin France. All Rights Reserved.