Beats

Beats is the phenomenon in which the periodic variations of amplitude are resulted from the superposition of two waves of slightly different frequencies. One maxima and following minima combined together is called one beat. Number of beats per second is the difference in the frequency of the two waves. There are two methods through which number of beats per second can be found out: analytical method and graphical method.
   
Method of beats is used to find the frequency of a tuning fork. This can be done in two ways: By filing and by loading.

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