(0% absorption at around 3,3 cm)
Speed of light = Wavelength * frequency
C = lamba * F
m/s = m * Hz
=>
http://da.wikipedia.org/wiki/Lysets_hastighed
Speed of light = 299792458 m/s
299792458 (m/s) / 1420405000 (Hz) = 0,211061252 m
around 21 cm
=>
Satellite: