Beats are produced by frequencies $v_1$ and $v_2$ $(v_1 > v_2)$. The duration of time between two successive minima is

  • A
    $\frac{1}{v_1+v_2}$
  • B
    $\frac{2}{v_1-v_2}$
  • C
    $\frac{2}{v_1+v_2}$
  • D
    $\frac{1}{v_1-v_2}$

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