OSCAR BURRIEL / SCIENCE PHOTO LIBRARY OSCAR BURRIEL / SCIENCE PHOTO LIBRARY
Hearing. Ear listening to the sound waves (green) produced by a tuning fork. When the tuning fork is struck it vibrates, producing sound waves of a particular musical note. These waves travel outwards from their source and those that reach the pinna (visible part of the ear) are directed into the ear canal. Deeper within the ear, the waves are converted into an electrical signal that the brain interprets as a musical note.
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