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Reflection and absorption...most likely a combination of the two. In reflection the wave bounces back off the barrier and, depending on the incident wave and how it matches in phase with the reflected wave, the reflected wave could be enhanced through constructive interference with the incident wave or degraded through destructive interference. In absorption, the energy from the incident wave is taken into the barrier material. This typically causes the barrier to vibrate indicating the energy it absorbed. A barrier is more likely to absorb the energy when its natural frequency is some harmonic of the incident wave.

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