Question

1. Why is sound wave called a longitudinal wave ?
2. Does sound follow the same laws of reflection as light does ? explain !
3. explain how the human ear works
4. How is ultrasound used for cleaning ?
5. what is reverberation? How can it be reduced ?

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Answer 1

Answer:

1) Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.

2) Yes, sound follows the same laws of reflection as that of light because, (i) Angle of incidence of sound is always equal to that of angle of reflection of sound waves. (ii) The direction in which sound is incident, the direction in which it is reflected and normal all lie in the same plane.

3) Sound is transmitted as sound waves from the environment. The sound waves are gathered by the outer ear and sent down the ear canal to the eardrum.

The sound waves cause the eardrum to vibrate, which sets the three tiny bones in the middle ear into motion.

The motion of the bones causes the fluid in the inner ear or cochlea to move.

The movement of the inner ear fluid causes the hair cells in the cochlea to bend. The hair cells change the movement into electrical pluses.

These electrical impulses are transmitted to the hearing (auditory) nerve and up to the brain, where they are interpreted as sound.

4) Ultrasonic cleaning uses cavitation bubbles induced by high frequency pressure (sound) waves to agitate a liquid. The agitation produces high forces on contaminants adhering to substrates like metals, plastics, glass, rubber, and ceramics. This action also penetrates blind holes, cracks, and recesses.

5) Persistence of sound (after the source stops producing sound) due to the repeated reflection is called reverberation. Reverberation can be reduced by absorbing the sound using some materials as it reaches the wall and ceiling of the room and thus prevent the sound from getting reflected. Some materials which are used to reduce reverberation are fibreboard, heavy curtains, plastics etc.

Answer 2

$\color{red}{QUESTION~1}$

Why is sound wave called a longitudinal wave ?

$\color{blue}{ANSWER}$

Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.

$\color{red}{QUESTION~2}$

Does sound follow the same laws of reflection as light does ? explain !

$\color{blue}{ANSWER}$

Yes, sound follows the same laws of reflection as that of light because,

1. Angle of incidence of sound is always equal to that of angle of reflection of sound waves.
2. The direction in which sound is incident, the direction in which it is reflected and normal all lie in the same plane.

$\color{red}{QUESTION~3}$

Explain how the human ear works

$\color{blue}{ANSWER}$

The sound waves are gathered by the outer ear and sent down the ear canal to the eardrum. The sound waves cause the eardrum to vibrate, which sets the three tiny bones in the middle ear into motion. The motion of the bones causes the fluid in the inner ear or cochlea to move.

[ Refer to the attachment also ]

$\color{red}{QUESTION~4}$

How is ultrasound used for cleaning ?

$\color{blue}{ANSWER}$

Ultrasonic cleaning uses cavitation bubbles induced by high frequency pressure (sound) waves to agitate a liquid. The agitation produces high forces on contaminants adhering to substrates like metals, plastics, glass, rubber, and ceramics. This action also penetrates blind holes, cracks, and recesses.

$\color{red}{QUESTION~5}$

what is reverberation? How can it be reduced ?

$\color{blue}{ANSWER}$

Reverberation can be reduced by absorbing the sound using some materials as it reaches the wall and ceiling of the room and thus prevent the sound from getting reflected. Some materials which are used to reduce reverberation are fibreboard, heavy curtains, plastics etc.

$\color{purple}{I}$ $\color{purple}{HOPE}$ $\color{purple}{THIS}$ $\color{purple}{HELPS}$ $\color{purple}{U}$

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