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<a accesskey="3" href="page.php?w=Amplitude&amp;p=2">3.Next</a>
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<p>The <b>amplitude</b> of a <a href="page.php?w=Periodic_function">period</a>ic <a href="page.php?w=Variable_%28mathematics%29">variable</a> is a measure of its change in a single <a href="page.php?w=Period_%28mathematics%29">period</a> (such as <a href="page.php?w=frequency">time</a> or <a href="page.php?w=Wavelength">spatial period</a>). The amplitude of a non-periodic signal is its <a href="page.php?w=Magnitude_%28mathematics%29">magnitude</a> compared with a reference value. There are various definitions of amplitude (see below), which are</p><p>
<a accesskey="3" href="page.php?w=Amplitude&amp;p=2">3.Next</a>
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