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(B) The beat frequency is defined as the number of times the resultant intensity of the superposition of two waves of nearly equal frequencies becomes

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Number of times the resultant intensity becomes maximum or minimum in one second

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(B) The beat frequency is defined as the number of times the resultant intensity of the superposition of two waves of nearly equal frequencies becomes maximum or minimum in one second.When two sound waves of slightly different frequencies $f_1$ and $f_2$ superimpose,the resultant intensity varies periodically with time. The frequency of this variation is given by $|f_1 - f_2|$.Since the intensity is proportional to the square of the amplitude,the intensity reaches a maximum when the waves interfere constructively and a minimum when they interfere destructively. The number of such maxima or minima per second is the beat frequency. Therefore,option $(b)$ is correct.

During the superposition of two waves of nearly equal frequencies,the beat frequency is defined as the:

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