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Cycles per second (abbreviated as CPS) was once the common unit used for measuring frequency. "Cycles per second" is a self-explanatory term: it is a measure of the speed of a given cycle, in terms of how many times that cycle is fully carried out within the space of one second of time. Historically, it has most often been used in the contexts of alternating-current electricity and sound. With the organization of the International System of Units (abbreviated SI from the French) in 1960, the name of the cycles-per-second measure was officially changed to the "Hertz" (abbreviated as "Hz"). It is used to measure the amount of wavelengths a photon makes in a second. To find a particles cycles per second you must first know the particles Lambda, or wavelength. Then you must divide it by the speed of light (3.0 x 10^8 meters per second) to get a particles Hertz, which is a measure of cycles-per-second.
