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<a accesskey="3" href="page.php?w=longitudinal_wave&amp;p=2">3.Next</a>
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<p><b>Longitudinal waves</b> are <a href="page.php?w=wave">wave</a>s which <a href="page.php?w=Oscillation">oscillate</a> in the direction which is parallel to the direction in which the wave travels and displacement of the medium is in the same (or opposite) direction of the <a href="page.php?w=wave_propagation">wave propagation</a>. <a href="page.php?w=Mechanical_wave">Mechanical</a> longitudinal waves are also called compressional or <b>compression waves</b>, because they produce <a href="page.php?w=compression_%28physics%29">compression</a> and</p><p>
<a accesskey="3" href="page.php?w=longitudinal_wave&amp;p=2">3.Next</a>
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