אנרגיה של גלים אלקטרו-מגנטיים 09:01 Jun 14, 2010
Radiant energy
Radiant energy is the energy of electromagnetic waves. The quantity of radiant energy may be calculated by integrating radiant flux (or power) with respect to time and, like all forms of energy, its SI unit is the joule. Radiant energy is generally thought of as radiation emitted by a source into the surrounding environment. It propagates in the form of electromagnetic waves, or traveling subatomic, atomic or molecular particles. Specific forms of radiant energy include electron space discharge, visible light, vacuum energy, and other wave types. | 
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