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When a wave hits a surface, any part of the wave that cannot pass through the surface bounces back.
The interaction with a surface.
Picture below

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The bending of waves due to a change in speed.
Picture below

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Waves interaction
When a wave moves around a barrier or through an opening in a barrier, it bends and spreads out.

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The Tacoma Narrows Bridge may have collapsed because of resonance.
Storm winds are said to have resonated with the natural frequency of the bridge.
This caused the amplitude of the bridge's sway to increase until the bridge collapse.
Happened 11-7-1940