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Friday, December 7, 2012

the external ear

the external ear:

It combines sound waves any acoustic energy and concentration on the eardrum, especially in the fluctuation of 3000 Hz, it increases energy from 30 to 100 times, so be sensitive to the human voice in this volatility and harm which affects deaf ear, for example, so in this oscillation.
We see part of the external ear is the pinna which combines acoustic waves. It is composed of thin cartilage and associated organ around ligaments and muscles.
Many animals can intervene external ears toward the sound in order to hear better, but man can not do so.
The second part of the external ear is the outer corridor and is a simple arcade sound waves pass into the middle ear.

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