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(D) In a wave displacement-position graph,the points with maximum displacement from the equilibrium position $(y = 0)$ are the crests and troughs of t

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All of the above

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(D) In a wave displacement-position graph,the points with maximum displacement from the equilibrium position $(y = 0)$ are the crests and troughs of the wave.Looking at the provided figure,the points $a$,$e$,and $i$ represent the peaks (crests) and valleys (troughs) of the wave.Point $a$ is at a maximum positive displacement.Point $e$ is at a maximum negative displacement.Point $i$ is at a maximum positive displacement.Therefore,all these points ($a$,$e$,and $i$) correspond to the positions of maximum displacement.Thus,the correct option is $D$.

The figure represents the instantaneous picture of a longitudinal harmonic wave travelling along the negative $x$-axis. Identify the correct statement$(s)$ related to the movement of the points shown in the figure. The points with maximum displacement are:

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