A61 Water Standing Wave

Water waves travelling towards along the water container are reflected off the walls when they reach either ends. Incident and reflected waves thus superpose and interfere with one another. A standing wave of significant amplitude can be formed only when the water waves have certain “correct” wavelengths.

Since water waves reflect off a wall without incurring any phase change, displacement antinodes are formed at the boundaries.  What was shown in the video were the 1st, 2nd and 3rd harmonics.

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