MCQ

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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
  $\frac{1}{2}\left(n_1-n_2\right)$
• B
  $\frac{1}{2}\left(n_1+n_2\right)$
• ✓
  $n_1 \sim n_2$
• D
  $2\left(n_1-n_2\right)$