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Reflection - The bouncing back of an object or a wave when it hits a surface through which it can't pass.

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Reflection - The bouncing back of an object or a wave when it hits a surface through which it can't pass.

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The bending of waves as they enter a new medium at an angle, caused by a change in speed.

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Boats and boating--Equipment and supplies

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The bending or spreading of waves as they move around a barrier or pass through an opening.

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The first Tacoma Narrows Bridge opened to traffic on July 1, 1940. Its main span collapsed into the Tacoma Narrows four months later on November 7, 1940, at 11:00 a.m. 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 collapsed.