When a mass $m$ is hung from the lower end of a spring of neglibgible mass, an extension $x$ is produced in the spring. The time period of oscillation is

  • A

    $T = 2\pi \sqrt {\frac{x}{{mg}}} $

  • B

    $T = 2\pi \sqrt {\frac{gx}{{m}}} $

  • C

    $T = 2\pi \sqrt {\frac{x}{{g}}} $

  • D

    $T = 2\pi \sqrt {\frac{x}{{2g}}} $

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