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Human Ear

Observe the g...

Question

Observe the given figure showing the parts of a human ear.

Identify the parts of the middle ear labelled P, Q and R through which vibrations of sound travel into the ear.

A

P - Stirrup , Q - Hammer , R - Anvil

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B

P - Hammer , Q - Anvil , R - Stirrup

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C

P - Anvil , Q - Stirrup , R - Hammer

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D

P - Hammer , Q - Stirrup , R - Anvil

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Solution

The correct option is B
P - Hammer , Q - Anvil , R - Stirrup

P is Hammer, Q is Anvil and R is Stirrup. These are the three ear ossicles which transmit vibrations of the eardrum caused by sound waves in the air to the fluid of the inner ear.

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Similar questions

Q. Three small interlocking bones: the hammer, the anvil, and the stirrup transmit the vibrations of the eardrum to the inner ear.

Q. There are three small bones in the muddle ear – anvil, hammer and stirrup :
(a) Which of these bones is in touch with ear-drum ?
(b) Which of these bones is in touch with oval window ?

Q. When a sound wave enters the ear, it sets the eardrum into oscillation, which in turn causes oscillation of 3 tiny bones in the middle ear called ossicles. This oscillation is finally transmitted to the fluid filled in inner portion of the ear termed as inner ear, the motion of the fluid disturbs hair calls within the inner ear which transmit nerve impulses to the brain with information that a sound is present. The three bones present in the middle ear are named as hammer, anvil and stirrup. Out of these the stirrup is the smallest one and this only connects the middle ear to inner ear as shown in the figure below. The area of stirrup and its extent of connection with the inner ear limits the sensitivity of the human ear. Consider a person's eat whose moving part of the eardrum has an area of about 43 mm

^{2}

and the area of stirrup is about 3.2 mm

^{2}

. The mass of ossicles is negligible. As a result, force exerted by sound wave in air on eardrum and ossicles is same as the force exerted by ossicles on the inner ear. Consider a sound wave having maximum pressure fluctuation of

3 \times 10^{- 2}

Pa from its normal equilibrium pressure value which is wqual to

10^{5}

Pa. Frequency of sound wave is 1200 Hz.
Data: Velocity of sound wave in air is 332 m/s. Velocity of sound wave in fluid (present in inner ear) is 1500 m/s. Bulk modulus of air is

1.42 \times 10^{5}

Pa. Bulk modulus of fluid is

2.18 \times 10^{9}

Find the displacement amplitude of given sound wave in the fluid of inner ear.

Q. Hammer, anvil and are the 3 smallest bones in the body.

Q. Stapes bone in the middle ear of humans is stirrup shaped.

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