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Human Ear

In a human ea...

Question

In a human ear, the sound is amplified in the outer ear as well as in the middle ear because of which we are able to listen to faint sounds also.

A

True

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B

False

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Solution

The correct option is A True
The sound waves from outside hit the eardrum which results in the vibration of the eardrum.
The outer ear collects and amplifies the sound and then sends it to the middle ear.
Middle ear consists of three bones called hammer, anvil, and stirrup.
These three bone system amplifies the sound waves coming from the outer ear.
Here the sound is amplified twice which is why we are able to listen the faint sounds also.
Hence, the given statement is True.

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Q. Put these terms, which describe the way sound travels from the air through your ear, in the correct sequence:
three tiny bones in the middle ear vibrate;your outer ear catches the sound and moves it inside your ear; a special nerve carries messages about sound to your brain; your eardrum begins to vibrate; liquid in the coiled tube of your inner ear vibrates

The sound waves from the outer ear are carried by the middle ear to the inner ear

Q. Which of the following statements is incorrect about human ear ?
A) The inner ear sends sound signals to the brain.
B) The outer ear collects sound from the surroundings.
C) Vibrations present in sound waves help in vibration of eardrum.
D) The eardrum vibrates to reproduce sound that goes to the brain.

Q. How is sound transmitted through different parts of the ear and how are we able to hear the sounds around us?

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.

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