Reflection of mechanical waves differs between free and fixed boundaries, impacting phase shifts and wave amplitudes.
Reflection of a mechanical wave about a free boundary occurs when the boundary is free to move, allowing the wave to reflect without a phase shift. An example of this is sound waves reflecting off an open field.
Reflection of a mechanical wave about a fixed boundary happens when the boundary is fixed, resulting in a phase shift upon reflection. An example is a wave on a string hitting a fixed end.
Amplitude, inverted, and fixed boundary are important concepts to understand the differences between these types of reflections.
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