If a number of sine waves with modulation indices $n_1, n_2, n_3, \dots$ modulate a carrier wave, then the total modulation index $(n)$ of the wave is:

  • A
    $n_1 + n_2 + \dots + 2(n_1 + n_2 + \dots)$
  • B
    $\sqrt{n_1 - n_2 + n_3 - \dots}$
  • C
    $\sqrt{n_1^2 + n_2^2 + n_3^2 + \dots}$
  • D
    None of these

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