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In a `ul(" (i) ")` wave the particles of the medium oscillate in a direction `ul(" (ii) ")` to the direction of propagation. Thus, during their oscillations, the particles may move upwards or downwards from the plane passing through their mean positions. The point of maximum positive displacement on a transverse wave is called `ul(" (iii) ")` and the point of maximum negative displacement is called `ul(" (iv) ")`. The wave produced in a stretched string when plucked are `ul(" (v) ")` waves.
