Two-Wave Interference

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© Eli Sidman, Technical Services Group, MIT.

This photograph of a ripple tank shows the interference of two water waves. The waves are excited by two vibrating probes near the top of the photograph. Blue circles have been added at the wave crests. Where the circles cross, the amplitudes add to produce a large displacement. In between, the displacement of one wave is canceled by the opposite displacement of the other. (Unit: 5)