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Mr. Dubey • 51.17K Points
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(A) eardrum
(B) lobe
(C) fluid in the inner ear
(D) pinna
Correct Answer - Option(A)
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Explanation by: Mr. Dubey
When a compression of the medium reaches the eardrum the pressure on the outside of the membrane increases and forces the eardrum inward. Similarly, the eardrum moves outward when a rarefaction reaches it. In this way the eardrum vibrates.

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