Electromagnetic radiation

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Added: 2018-03-17

4282

wojciechkorsak

Created with: MindManager

based on wikipedia

Tags: Electromagnetic radiation intro Electromagnetic waves making up electromagnetic radiation can be imagined as self-propagating transverse oscillating waves of electric and magnetic fields. This diagram shows a linearly polarized plane EM-wave propagating from left to right (along X-axis in left-handed coordinates). The electric field is in a vertical plane (X/Z axes) and the magnetic field in a horizontal plane (X/Y axis). The electric and magnetic fields in polarized EM waves are always in phase and in planes at 90 degrees to each other. In electromagnetic radiation (such as microwaves from an antenna shown here) the term applies only to the parts of the electromagnetic field that radiate into infinite space and decrease in intensity by an inverse-square law of power so that the total radiation energy that crosses through an imaginary spherical surface is the same no matter how far away from the antenna the spherical surface is drawn. Electromagnetic radiation thus includes the far field part of the electromagnetic field around a transmitter. A part of the "near-field" close to the transmitter forms part of the changing electromagnetic field but does not count as electromagnetic radiation. Physics History of discovery Electromagnetic spectrum Types and sources classed by spectral band Biological effects about this map Wojciech Korsak Mindjet MindManager mindmapping knowledge education science

Created with: MindManager

Categories: Science & Technology,

Language: English,

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