electromagnetic radiation
Electromagnetic radiation is composed of electric and magnetic energy transferred in space, and this energy is generated by the movement of charges. For example, a moving charge from a radio frequency antenna that is transmitting a signal generates electromagnetic energy. The electromagnetic "spectrum" includes all kinds of electromagnetic radiation, from very low frequency electromagnetic radiation to very high frequency electromagnetic radiation. There are also radio waves, microwaves, infrared, visible light and ultraviolet light in between. The general definition of the radio frequency part of the electromagnetic spectrum refers to radiation with a frequency of about 3 kHz to 300 GHz. Some electromagnetic radiation has certain effects on the human body.