What is beat frequency?

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(N/A) Beat frequency is defined as the number of beats produced per unit time.
When two sound waves of slightly different frequencies,$f_1$ and $f_2$,interfere with each other,the resulting intensity of the sound varies periodically.
The frequency of this variation in intensity is known as the beat frequency $(f_b)$.
It is mathematically expressed as the absolute difference between the two frequencies: $f_b = |f_1 - f_2|$.

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