The longest used is I think long wave radio which can be up to 1500 meters
No surprise, radio waves known as ELF waves, or "Extreme Low Frequency."
ELF radio waves or extremely low frequency radio waves. These may have frequencies below 1 Hz in some cases!
The waves with the longest wavelengths are known as radio waves.
Radio waves have the lowest frequencies among electromagnetic waves. They have frequencies ranging from about 3 kHz to 300 GHz.
Radio waves have the highest wavelength in the electromagnetic spectrum.
Radio waves have the lowest frequency on the electromagnetic spectrum. They have the longest wavelength, which corresponds to a lower frequency.
All of them can be used to add information to the waves.
how are radio waves be used- well they are used by sound waves like as in u can hear sond waves but radio waves is where you are in the car and u are listening for instance capital fm that is radio waves Hope It Helped Hennddyyyy:) :D
to send radio waves through the air to make the radio work
Satellites are used to relay radio waves to the other side of the world because radio waves cannot travel directly through the Earth.
Electromagnetic waves used in broadcasting are called radio waves. They are used to transmit signals for radio, television, and communication systems.