🔊 Propagation of sound
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Sound propagates in the form of longitudinal waves. This means the direction of vibration of the particles is along the direction of propagation of the wave.
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Key features of sound propagation:
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- Sound needs a medium (air, water, solids).
- In vacuum, sound cannot be transmitted.
- Sound travels faster in solids than in gases, because the particles are closer together.
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Example: You hear an approaching train over the rails more quickly if you put your ear to the tracks than through the air.
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