In Physics, frequency is defined as the total number of occurrences of a repeating event per unit time. Another similar property is ‘period’, which is the reciprocal of the frequency. For cyclic processes such as oscillations and rotations, frequency is defined as a number of cycles per unit time. The derived SI unit of frequency is hertz (Hz) which is named after the German physicist Heinrich Hertz and 1 hertz is the total number of times an event repeats in one second. There are basically two different types of frequencies:
• Angular Frequency: Rate of change of angular displacement
• Spatial Frequency: An analogous to temporal frequency
Notable examples where different frequencies of the same phenomenon exhibit some-what different properties are:
• Light: visible light is only available in certain frequencies
• Sound: the range of the sound that is audible to humans exists only in certain frequencies.
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