In 1862, James Clerk Maxwell published his famous Maxwell’s equations. This was at a time when humans were just starting to ...

All forms of electromagnetic ... the crest of one wave to the crest of the next wave), by frequency (the number of wave cycles that pass by in a given period, measured in Hertz, which stands ...

In the 1880s Heinrich Hertz discovered that a spark jumping between two pieces of metal emits a flash of light—rapidly oscillating electromagnetic waves—which can be picked up by an antenna.