Introduction:
Humans and many animals can
produce sound and use it to communicate. Many objects can also produce
sound when hit or rubbed against each other. Sound produced by objects
can also be used to identify the type of material used in production of
that object. For example if you see a clear jar and you are wondering if
it is plastic or glass, you nock on it and listen to it's sound. Sound
has many medical and industrial applications as well. Sound is used in
the sea to locate and identify submarines, fishes and under water
elevations. It is also being used see inside the human body.
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