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Wonders of Physics

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Wave – Displacement-time graph of a particle on a wave


Solutions: Option C

Consider positive displacement if the particle P is above the undisturbed position, and negative displacement if the particle is below the undisturbed position.

Notes page16

The next instance, the particle P will be moving vertically downwards, i.e. moving nearer to its undisturbed position. So the displacement decreases to zero before it moves below the undisturbed position (negative displacement).