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<p>c is the <a href="page.php?w=speed_of_light">speed of light</a>, and e is the <a href="page.php?w=elementary_charge">elementary charge</a>.</p>

<p>The photon energy of near <a href="page.php?w=infrared">infrared</a> radiation at 1&nbsp;um wavelength is approximately 1.2398&nbsp;eV.</p>

<p><big> Examples </big></p>
<p>An <a href="page.php?w=FM_broadcasting">FM</a> <a href="page.php?w=radio">radio</a> station transmitting at 100&nbsp;<a href="page.php?w=megahertz">MHz</a> emits photons with an energy of about . This minuscule amount of energy is approximately</p><p>
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