Editing Electromagnetic radiation (section)

=== Radio and microwave ===
{{Main|Radio wave|Microwave}}
Electromagnetic radiation phenomena with wavelengths ranging from one meter to one millimeter are called microwaves; with frequencies between 300&nbsp;MHz (0.3&nbsp;GHz) and 300&nbsp;GHz. When radio waves impinge upon a [[Electrical conductor|conductor]], they couple to the conductor, travel along it, and [[radio frequency induction|induce]] an electric current on the conductor surface by moving the electrons of the conducting material in correlated bunches of charge. At radio and microwave frequencies, EMR interacts with matter largely as a bulk collection of charges which are spread out over large numbers of affected atoms. In [[electrical conductor]]s, such induced bulk movement of charges ([[electric current]]s) results in absorption of the EMR, or else separations of charges that cause generation of new EMR (effective reflection of the EMR). An example is absorption or emission of radio waves by antennas, or absorption of microwaves by water or other molecules with an [[electric dipole moment]], as for example inside a [[microwave oven]]. These interactions produce either electric currents or heat, or both.