Sound

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Sound is a form of energy that produces the sensation of hearing in our ears.

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Sound is produced when a body vibrates. Each source of sound is a vibrating body.

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Sound ceases when the vibrating body stops vibrating. Example: the humming sound from a vibrating ruler stops when the ruler stops vibrating.

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Vibratory motion is the oscillatory motion in which the body assumes a new shape during its motion.

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A tuning fork is a U-shaped metallic piece with a stem in the middle. Its arms are called prongs. When struck on a rubber pad, the prongs vibrate and produce sound.

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When a tuning fork is struck and brought near a suspended table tennis ball, the ball jumps to and fro on touching the prong. This shows that the prongs are vibrating.

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The larynx, also called the voice box, produces human sound. Air from the lungs passes through the vocal cords, and the cords vibrate to produce sound.

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During breathing, vocal cords are loose and the gap between them increases. During talking, shouting, or singing, vocal cords become tight and vibrate.