For water waves and sound waves the unit hertz is usually good enough but radio and TV waves have such a high frequency that the kilohertz (\(kHz\)) or even the megahertz (\(MHz\)) are better units.

In a radio signal ... crest of the next wave), by frequency (the number of wave cycles that pass by in a given period, measured in Hertz, which stands for cycles per second), and by the energy ...

(Heinrich Herz, for whom the units hertz and megahertz are named, had discovered and first produced radio waves in 1888.) Marconi jumped right on the problem. He began experimenting at his family ...

In his lifetime he was famous as a scientific administrator; today he is also known as a great scientist. He discovered induction before Faraday and radio waves long before Hertz ...