Noções sobre uso do espectro eletromagnético
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- 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