A transverse harmonic wave on a string is described by $y = 3\sin \left( {36t + 0.018x + \frac{\pi }{4}} \right)$ where $x$ and $y$ are in $cm$ and $t$ in $s$. The least distance between two successive crests in the wave is .... $m$

  • A

    $2.5$

  • B

    $3.5$

  • C

    $1.5$

  • D

    $4.5$

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