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By Anne Marie Helmenstine, Ph.D. Definition: Frequency is the number of times a point on a wave passes a fixed reference point in one second. The SI unit for frequency is the Hertz (Hz). Also Known As: cycles per second.
The frequency of the periodic motion is known as a vibration frequency, and the typical frequencies of molecular vibrations range from less than 10 12 to approximately 10 14 Hz.he coordinate of a normal vibration is a combination of changes in the positions of atoms in the molecule. When the vibration is excited the coordinate changes sinusoidally with a frequency Î½, the frequency of the vibration.