Beats are the result of

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(D) Beats are the result of the superposition of two waves of nearly equal frequencies.When two sound waves with slightly different frequencies travel

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Superposition of two waves of nearly equal frequency

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(D) Beats are the result of the superposition of two waves of nearly equal frequencies.When two sound waves with slightly different frequencies travel in the same direction,they interfere with each other.This interference causes the resultant amplitude to vary periodically with time,leading to a phenomenon known as beats.The frequency of the beats is equal to the difference between the frequencies of the two original waves,i.e.,$f_{beat} = |f_1 - f_2|$.As the waves alternately interfere constructively and destructively,the loudness of the sound rises and falls periodically.

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