Longitudinal waves

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In a longitudinal wave is a compression pulse always followed by a rarefaction on its tail
 

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tech99
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In a longitudinal wave is a compression pulse always followed by a rarefaction on its tail
It is possible to have just one direction of pulse but then the whole system has moved forward statically. For electrical transmission lines we have created a DC component. A balanced system of pulses (maybe 3 for instance) has no residual DC component. This would be obtained if the transmission line is driven via a DC blocking capacitor.
 

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