The frequency of electromagnetic waves is measured in Hertz(Hz).
What is Hertz?
Hertz (symbol: Hz) is the frequency unit in the International System of Units (SI), equal to one event (or cycle) per second. Hertz is an SI-derived unit whose expression in SI-based units is s−1, meaning that 1 Hertz is the reciprocal of 1 second [2]. It is named after Heinrich Rudolf Hertz (1857–1894), who was the first to conclusively prove the existence of electromagnetic waves. Hertz is usually expressed in multiples of kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). Some of the most common uses of the device are to describe sine waves and musical tones, especially those used in radio and audio applications. It is also used to describe the clock speed at which computers and other electronic devices operate. Units are also used as a representation of photon energy via the Planck relation E = hν. where E is the photon's energy, ν is its frequency, and the proportionality constant h is Planck's constant.
Therefore, The frequency of electromagnetic waves is measured in Hertz(Hz).
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