Noções sobre uso do espectro eletromagnético

Leitura complementar

http://en.wikipedia.org/wiki/Electromagnetic_spectrum

http://en.wikipedia.org/wiki/Electromagnetic_radiation

http://en.wikipedia.org/wiki/Photon

http://en.wikipedia.org/wiki/Wavelength

http://en.wikipedia.org/wiki/Frequency

http://en.wikipedia.org/wiki/Speed_of_light

http://en.wikipedia.org/wiki/Radio_spectrum

http://en.wikipedia.org/wiki/Cosmic_rays

http://en.wikipedia.org/wiki/Radio_propagation

http://en.wikipedia.org/wiki/Category:Communications_satellites

http://en.wikipedia.org/wiki/Geostationary_orbit

Ionosfera [1] [2]

Troposfera [3] [4]