View Single Post
Old 02-13-2014, 01:35 PM   #5
Aileen
 
Aileen's Avatar
 
Статус: New Member
Join Date: Feb 2014
Posts: 1
Default

Radio is the wireless transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light,in the radio frequency range,from about 3 kHz to 300 GHz.
Aileen is offline   Reply With Quote