Two sources of sound placed close to each other are emitting progressive waves given by $y_1 = 4 \sin(600\pi t)$ and $y_2 = 5 \sin(608\pi t)$. An observer located near these two sources of sound will hear:

  • A
    $8$ beats per second with intensity ratio $81:1$ between waxing and waning.
  • B
    $4$ beats per second with intensity ratio $81:1$ between waxing and waning.
  • C
    $4$ beats per second with intensity ratio $25:16$ between waxing and waning.
  • D
    $8$ beats per second with intensity ratio $25:16$ between waxing and waning.

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