Explain how the human ear works.

Explanation

The functioning of the human ear is shown in (Fig. 6.36).
(i) The outer ear collects sound waves which are conducted through the auditory canal.
(ii) These waves fall on the ear drum and set it into vibrations.
(iii) The middle ear which is of the size of a small marble and houses ossicicles (three bones : hammer, anvil and stirrup) amplifies these oscillations about `60 times`.
(iv) The inner ear which contains cochlea and is filled with a fluid converts these pressure variations into electrical signals.
(v) These electrical signals are conveyed to rthe brain via auditory nerve for interpretation.
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