For a certain organ pipe three successive resonance frequencies are observed at $425\, Hz,595 \,Hz$ and $765 \,Hz$ respectively. If the speed of sound in air is $340 \,m/s$,  then the length of the pipe is ..... $m$

  • A

    $2$

  • B

    $0.4$

  • C

    $1$

  • D

    $0.2$

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