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If $l_1$ and $l_2$ are the lengths of air column for the first and second resonance when a tuning fork of frequency $n$ is sounded on a resonance tube, then the distance of the displacement antinode from the top end of the resonance tube is:
  • A$2\left( {{l_2} - {l_1}} \right)$
  • B$\frac{1}{2}\left( {{2l_{2  }}-{l_1}} \right)$
  • C$\frac{{{l_2} - 3{l_1}}}{2}$
  • D$\frac{{{l_2} - {l_1}}}{2}$
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