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frequency
The number of waves passing a fixed point in a second. Frequency is measured in hertz (Hz), kilohertz (kHz), or megahertz (MHz), named after after the scientist who first produced and observed radio waves in the laboratory. For example, if 1,000 peaks cross a given point in one second, the frequency is 1,000 cycles per second or 1,000 hertz = 1 kHz.
More generally, frequency is the number of times a value occurs in some time interval.
Related categories
• WAVES AND WAVE PHENOMENA
• ACOUSTICS AND MUSICS
• ASTRONOMICAL QUANTITIES
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