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Two adjacent piano keys are struck simultaneously. The notes emitted by them have frequencies ${n_1}$ and ${n_2}$. The number of beats heard per second is
  • A$\frac{1}{2}({n_1} - {n_2})$
  • B$\frac{1}{2}({n_1} + {n_2})$
  • C${n_1}- {n_2}$
  • D$2\,({n_1} - {n_2})$
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