A frequencyThe frequency describes the number of oscillations per second and is given in the unit Hertz (Hz). An oscillation passes through various points: The starting point, the maximum point, the... range refers to a specific range of frequencies within the electromagnetic spectrum. It is defined by an upper and lower cut-off frequencyThe frequency describes the number of oscillations per second and is given in the unit Hertz (Hz). An oscillation passes through various points: The starting point, the maximum point, the.... A frequencyThe frequency describes the number of oscillations per second and is given in the unit Hertz (Hz). An oscillation passes through various points: The starting point, the maximum point, the... range can be narrow or wide, depending on the bandwidth of the frequencies it contains.