In incidents related to sound, beats are very important and has many uses. For tuning of musical instruments, this is used. If we wish to listen only one type of note from the musical instrument then it is only possible if it does not have beats. When beats are not present the musical instrument become same tone. With the help of this the frequency of unknown tuning fork is also known.

By the method of beats the calculation of the frequency of unknown tuning fork.

To calculate the frequency of unknown tuning fork, an approximately same but known frequency tuning fork is taken because to observe the beats of sound waves is necessary that the difference in the frequency of both the forks is not much otherwise beats will be formed so fast that to hear them will not be possible. Both the tuning forks are vibrated together and per second the number of beats is calculated. Suppose known frequency of the tuning fork is n and the obtained beats is ∆n then the frequency of unknown tuning would be n + ∆n or n – ∆n.