The vibrations of the tympanic membrane are amplified approximately ............... times in the oval window.

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Solution

The correct option is B 20
The ear ossicles cause the oval window to vibrate; this is a small membrane-covered opening directly below the stapes. Since the ear ossicles amplify the vibrations of the tympanic membrane and since the oval window is much smaller than this membrane, the waves are amplified 15 to 20 times their original amount.

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\begin{matrix} Parts & Function (a) External ear & (i) Amplifies the vibrations received on the tympanic membrane. (b) Middle Ear & (i i) Converts the vibrations into nerve impulses and sends them to brain. (c) Inner Ear & (i i i) Directs the sound waves towards the tympanic membrane. \end{matrix}

Match the following parts of the ear with functions

Column 1 Column 2

1. Pinna 1. Collects Vibrations in the air

2. Cochlea 2. Region between Pinna and eardrum

3. Meatus 3. Transfers vibrations to ear ossicles

4. Tympanic membrane 4. Translates sound to nerve impulses

5. Eustachian tube 5. Equalises pressure between the inner

and outer ear

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