$A$ heavy brass sphere is hung from a spring and it executes vertical vibrations with period $T$. The sphere is now immersed in a non-viscous liquid with a density $(1/10)^{\text{th}}$ that of brass. When set into vertical vibrations with the sphere remaining inside the liquid all the time,the time period will be

  • A
    $\sqrt{\frac{9}{10}} T$
  • B
    $\sqrt{\frac{10}{9}} T$
  • C
    $\frac{9}{10} T$
  • D
    Unchanged

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