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 What Sound Frequencies are Heard by Humans?

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 in a
noisy environment, for example near an airport or railway,
the noise that you hear can be reduced by double glazing.
If someone is working with noisy power tools, for example
a drill or a saw, they can wear ear defenders.
Ear defenders look like headphones or ear muffs.

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