What is an example of frequency

'Frequency' is a word that often confuses some people ... for no good reason.It just means "frequent-ness" or "often-ness" ... how often something happens.The SI unit of frequency is the Hertz (Hz).  Hz means 'per second'.So  " 13 Hz "  means  13 per second.Here are examples of frequency:-- 780 kilohertz (on your AM radio dial)-- 98.7 Megahertz (on your FM dial)-- 5.8 Gigahertz-- twice a day-- three per week-- every 6 months

For example 75 Hertz means that there are 75 wave tops per second in for example a radio signal.