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This Demonstration shows the continuous train of reverberation pulses that results from a stack of layers when a plane acoustic wave with delta amplitude impinges on the bottom interface from below. All internal reflections in the bounded layers are taken into account. The sequence of reflected pulses back into the bottom half-space and the sequence of transmitted pulses into the top half-space are shown. The solution is tractable only because each layer is assumed to have equal travel time across it, and so the resulting pulses are equally spaced in time. The "number of layers" selection includes the bottom and top half-spaces. The "number of output points" selection only goes up to 8 because reverberation amplitudes quickly go to zero. Set the impedance of each layer with the individual slider bars. To simulate a vacuum in the top half-space, one can set its impedance to zero.
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