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(C) In a longitudinal wave,the displacement $y$ represents the displacement of particles from their mean position along the $x$-axis. Rarefaction corr

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$g$

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(C) In a longitudinal wave,the displacement $y$ represents the displacement of particles from their mean position along the $x$-axis. Rarefaction corresponds to the region where the density of particles is minimum,which occurs at the points where the slope of the displacement-position graph is zero and the displacement changes from negative to positive (i.e.,the mean position where particles are moving apart). In the given displacement-position graph,the points $c$ and $g$ represent the mean positions. For a wave travelling in the negative $x$-direction,the particles at the mean position $g$ are moving in the positive $y$-direction (as the wave moves left,the profile shifts left,so the point $g$ will move up). Since the wave is longitudinal,the displacement $y$ in the graph represents the longitudinal displacement of the particles. Rarefaction occurs where the particles are moving away from each other,which corresponds to the points where the slope is positive (i.e.,$c$ and $g$). Looking at the options,$g$ is a point of maximum rarefaction.

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 of maximum rarefaction are

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