You need to know about these quantities used in waves - what they mean, the symbols used for them and the units used to measure them. Don't get confused with this quantity frequency. It is not a ...

Radio frequency (RF) refers to the part of the electromagnetic spectrum where electromagnetic waves can be generated by alternating current fed to an antenna. It spans from around 3 kHz to 300 GHz.

Between 50 and 1,000 kilometers above our heads is the ionosphere, a layer of Earth's upper atmosphere consisting of charged ...

For thousands of years, humans were looking up at the star-studded night sky using just their eyes sensitive to the optical wavelength ... The discovery that radio waves from bodies in the ...

A group of researchers is attempting to bounce radio signals off a 500-foot-wide asteroid during its close flyby of Earth on Tuesday. The High Frequency ... with long wavelength radars and radio ...

Haynes said it is the lowest-frequency, highest-power transmitter available for JPL and NASA to use. In the experiment, HAARP “chirps” about every 2 seconds, sending radio waves up to the ...

Radio Frequency Identification (RFID) is a technology that uses radio waves to passively identify a tagged object. It is used in several commercial and industrial applications, from tracking items ...