The hertz (symbol Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second. It is named after Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves. are commonly expressed in multiples kilohertz (10 3 Hz, kHz), megahertz (10 6 Hz, MHz), gigahertz (10 9 Hz, GHz), terahertz ...
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