Abstract
Electromagnetic radiations are a form of conveying energy without any material support. Very heterogeneous by the energy that they transmit and by their possibilities of interacting with matter and in particular biological structures, they can be described either as electromagnetic waves (“wave” model), or as a flux of photons* (“particle” model).
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Notes
- 1.
Another expression of the magnetic component is often used: “magnetic induction” or “magnetic flux density” designated B, expressed in tesla (T). H and B are linked by B = µH where µ is the magnetic permeability of the propagation medium. In most biological media, µ is equal to the magnetic permeability of a vacuum µ 0 = 4π × 10−7. It may be deduced from this that a tesla is approximately equal to 8 × 105 A/m. “B” is often incorrectly termed “magnetic field”.
- 2.
\( 1\,{\rm{eV}} = 1.6 \times 10^{{ - 19}} \,{\rm{J.}} \)
- 3.
Sometimes known as near UV, as opposed to far UV, which have greater energy.
- 4.
\(1\,{\rm{W}} = 1\,{\rm{J}}/s. \)
To Find Out More
Nave CR (2012) Hyperphysics, Georgia State University. http://hyperphysics.phy-astr.gsu.edu/hbase/mod4.html
Wangsness RK (1986) Electromagnetic Fields, 2nd edn. John Wiley & Sons, Hoboken
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© 2012 Springer-Verlag France
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Aurengo, A., Perrin, A. (2012). Some Physical Reminders Regarding Electromagnetic Radiation. In: Perrin, A., Souques, M. (eds) Electromagnetic Fields, Environment and Health. Springer, Paris. https://doi.org/10.1007/978-2-8178-0363-0_1
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DOI: https://doi.org/10.1007/978-2-8178-0363-0_1
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