PP Presentation
1.0 10E6 10E12 10E18 10E24
HZ
Long radio waves
AM
Short
Waves
FM,TV
Microwaves
Infrared
Visible light
Ultraviolet
light
X-rays
Gamma rays
The electromagnetic spectrum
A LITTLE HISTORY ON WIRELESS NETWORKS.
PRIOR TO THE NINETEENTH CENTURY, SCIENTISTS THOUGHT
VISIBLE LIGHT WAS THE ONLY WAVELENGTH OF THE
ELECTROMAGNETIC SPECTRUM.