Frequency - Wikipedia
https://en.wikipedia.org/wiki/Frequency
WebFrequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals ( sound ), radio waves, and light . Contents 1 Definitions and units 2 Period versus frequency 3 Related quantities 4 In wave propagation 5 Measurement 5.1 Counting
DA: 86 PA: 55 MOZ Rank: 92