Question

pls explain me sound chapter of class 7​

Answer 1

Explanation:

Sound is just a vibration going through a matter. It is created when something vibrates and sends waves of energy into our ears. Human beings hear sounds that vibrate between 20 and 20,000 times in a second. Sound originates at a point and travels in all directions.

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Answer 2

Sound is produced by vibration. When a body vibrates, it forces the neighbouring particles of the medium to vibrate. This creates a disturbance in the medium, which travels in the form of waves. This disturbance, when reaches the ear, produces sound.