Hertz.
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Cycles per second (CPS) unless you are dealing with electrical, electro-magnetic, and electronic issues, in which case the 'vibrations' are measured in Hertz (Hz). The word is capitalized because its name comes from a person's name. The unit, "Hertz" is often mistakenly used when CPS is the correct unit.
Hertz are used to measure cycles per second. Sound is measured in hertz. I hope I understood the question.
-- Determine the number of revolutions, vibrations, reciprocations, or full oscillations in one second. -- Multiply that number by (2 pi).
It is called the frequency. The SI unit is the Hertz. One Hertz is one cycle per second.
-- take the number of meters per second-- divide it by 1,000-- the result is the number of kilometers per second