Electromagnetic waves

X X   X X   Extracts   X X   X X

Full Text of the Document

X X   X X   Extracts   X X   X X

....y be metallic cables, optical fibres or even simple tubes. All electromagnetic waves are susceptible to interference from one another and unrelated electrical energy can distort or destroy the information they carry. To reduce these problems they have been organized within the spectrum into bands of frequencies or wavelengths for the transmission of particular types of services and information." ....