4.Explain the experiment "Sound needs medium for propagation" *
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Explanation:
Sound is a mechanical wave that needs a material medium like air, water, steel, etc., for its propagation. ... The sound wave is a longitudinal wave, ie., the particles of the medium vibrate in a direction parallel to the direction of the propagation of the wave.
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Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.
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