How electromagnetic waves used in communication?

Answer 1

All electromagnetic radiation can be used for communication, up to frequency of,

let's say, 3 x 1015 Hz (down to wavelength of, say, 100 x 10-9 m), in the ultraviolet.

Past that, higher frequencies (shorter wavelengths) are difficult to generate, modulate,

and control, are more hazardous to human exposure, and are absorbed in the atmosphere,

so they're not too practical for communication.

Answer 2

Visible light is a type of electromagnetic wave that is occasionally used for communication. More common examples, however, include radio waves and television waves.

Answer 3

All parts of the EM spectrum can be used for communication. The most exploited however are radio waves and microwaves.

Answer 4

Radio waves are transmitted at one antenna, and received at another. Also, light is shone through a glass fiber (fiber optics), and received at the other end.

Answer 5

wireless spectrum