Longitudinal Waves


The disturbance at the top (shown in red) is due to a source somewhere beyond the left end. The disturbance at the bottom (shown in blue) is due to a source somewhere beyond the right end. The pattern in the middle (shown in yellow) is the result of combining the two disturbances. In the middle portion a layer is shown in white when it is at its equilibrium position. Green colored layers at the ends are for reference. They can help you identify the initial phases of the pulses/waves. For example the green layers are at opposite extremes of their mean positions when the pulses/waves are out of phase and on the same-side extremes of their mean positions when the waves are in phase. Watch the intial movement of these layers, alternating between in and out of phase.

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