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<p>on the source.  </p>

<p>Isotropic radiators are used as reference radiators with which other sources are compared, for example in determining the <a href="page.php?w=antenna_gain">gain</a> of <a href="page.php?w=antenna_%28radio%29">antenna</a>s.   A <a href="page.php?w=Coherence_%28physics%29">coherent</a> isotropic radiator of electromagnetic waves is theoretically impossible, but incoherent radiators can be built.   An isotropic sound radiator is possible because sound is a <a href="page.php?w=longitudinal_wave">longitudinal wave</a>.</p>

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