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<p>10<sup>-22</sup> to 10<sup>-30</sup> <a href="page.php?w=joule">joule</a>s. So the antenna of even a very low power transmitter emits an enormous number of photons every second.  Therefore, except for certain <a href="page.php?w=molecular_electron_transition">molecular electron transition</a> processes such as atoms in a <a href="page.php?w=maser">maser</a> emitting microwave photons, radio wave emission and absorption is usually regarded as a continuous <a href="page.php?w=classical_electromagnetism">classical</a> process, governed by <a href="page.php?w=Maxwell%27s_equations">Maxwell's equations</a>.</p><p>
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