What is the term used to describe the strength of a radio signal?

The term that describes the strength of a radio signal is amplitude. Amplitude refers to the height of the radio wave's signal, which directly correlates to its strength or intensity. A higher amplitude indicates a stronger signal, which can be more easily detected and received by radar or Lidar systems. This strength can affect the quality of the data obtained and the range over which the signal can effectively operate.

Frequency refers to the number of occurrences of a repeating event per unit time and is related to the pitch of the signal rather than its strength. Wavelength is the distance between successive peaks of a wave and is inversely related to frequency but does not measure strength. Phase describes the position of a point in time on a waveform and relates to timing rather than amplitude. Thus, amplitude is the most appropriate term for indicating the strength of a radio signal.