A string of mass $M$ and length $L$ hangs freely from a fixed point. The velocity of transverse wave along the string at a distance $'x'$ from the free end will be

  • A

    $\sqrt {gx} $

  • B

    $\sqrt {2gx} $

  • C

    $2\sqrt {gx} $

  • D

    $\sqrt {2g(L - x)} $

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