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The tympanic membrane separates the ear canal from the _____________

(a) upper ear cavity

(b) lower ear cavity

(c) middle ear cavity

(d) inner ear cavity

The question was posed to me in an online interview.

Query is from Mechanism of Hearing in chapter Audiometry of Biomedical Instrumentation

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Right answer is (c) middle ear cavity

The explanation: The tympanic membrane separates the ear canal from the middle ear cavity. The pinna scatters acoustic waves so that some of the scattered energy enters the auditory canal and pushes against the tympanic membrane during a wave of compression. The distance membrane moves is a function of the force and velocity with which the air molecules strike it and is, therefore, related to the loudness of sound.

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