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(D) When two waves of almost equal frequencies $v_1$ and $v_2$ reach a point simultaneously,the phenomenon of beats is produced.The beat frequency is

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$\frac{1}{v_1 - v_2}$

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(D) When two waves of almost equal frequencies $v_1$ and $v_2$ reach a point simultaneously,the phenomenon of beats is produced.The beat frequency is defined as the difference between the two frequencies: $v_{	ext{beat}} = |v_1 - v_2|$.The time interval between successive maxima (the time period of the beat) is the reciprocal of the beat frequency.Therefore,the time interval $T = \frac{1}{v_{	ext{beat}}} = \frac{1}{|v_1 - v_2|}$.

When two waves of almost equal frequencies $v_1$ and $v_2$ reach a point simultaneously,the time interval between successive maxima is

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