View source for Category talk:03 Electromagnetic radiation

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==Basic physical equations==

Life on earth would be impossible without solar energy. The source of the sun's energy are nuclear fusion processes of hydrogen to helium. Electromagnetic  radiation (EMR) is generated on the surface of the sun and carries solar energy through the space to the earth.

The phenomenon of EMR can be explained by two physical theories at the same time: the wave theory and the quantum theory. 
EMR can be seen as a wave with time-varying electric (E) and magnetic fields (B). These vector fields have a sine waveform, are oriented at right angles at each other and oscillate perpendicular to the direction of wave travel (Fig.).