Frequency

"Number of oscillations per unit time or number of wavelengths that pass a point per unit time. In other words, the rate of oscillation of a wave. In remote sensing, frequency is used to quantify electromagnetic radiation by denoting the number of oscillations of the perpendicular electric and magnetic fields per second. This measurement is expressed in hertz (Hz), or number of cycles per second. One megahertz (MHz) is equal to one million cycles per second, while one gigahertz (GHz) is equal to one billion cycles per second" (National Aeronautics and Space Administration, 2019)

Sources

"Glossary". Goddard Soace Flight Center, National Aeronautics and Space Administration. 2019.
https://pmm.nasa.gov/resources/glossary#letter_f
Accessed April 1, 2019.

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