1. Electromagnetic radiation
1.1 Definition
In 1865, Maxwell established that electromagnetic radiation is a vibratory phenomenon propagating energy through space. If the electric and magnetic fields making up this phenomenon are sinusoidal (as a function of time), the wave is monochromatic and represented by its frequency ν.
In transparent homogeneous media, energy propagates in a straight line. In a vacuum, the speed of propagation is a constant c, whose value is 299,792,458 m · s –1 . The wavelength λ associated with the radiation is then: λ = c /ν.
In general, electromagnetic radiation is made up of a set of radiations, each characterized by its wavelength in vacuum. The names associated with the various electromagnetic...
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Electromagnetic radiation
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