Frequency

Number of oscillations in a time unit. Frequency and wavelength are connected to each other.

The measure of frequency is Hertz (Hz):
1 Hz = 1 oscillation per second = 1/s.
1 kilohertz (kHz) = 1000 Hz
1 megahertz (MHz) = 1000 kHz
1 gigahertz (GHz) = 1000 MHz
1 terahertz (THz) = 1000 GHz