What is Hertz?
Hertz is the international unit for measuring frequency and its equivalent to cycles per second. One megahertz is one million hertz. A gigahertz is a billion hertz. The standard US electrical power frequency is 60 Hertz.
The AM broadcast radio frequency is between 0.55 to 1.6 megahertz. The FM broadcast frequency is 88 to 108 megahertz. The IEEE 802.11 WLans operate in a 2.4 Gigahertz and 5 Gigahertz.