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A simple pendulum oscillating in air has period \( T \). The bob of the pendulum is completely immersed
\( \mathrm{P} \) in a non-viscous liquid. The density of the liquid is W \( \left(\frac{1}{16}\right)^{\text {th }} \) of the material of the bob. If the bob is inside liquid all the time, its period of oscillation in this liquid is
(a) \( 4 T \sqrt{\frac{1}{14}} \)
(b) \( 4 T \sqrt{\frac{1}{15}} \)
(c) \( 2 T \sqrt{\frac{1}{10}} \)
(d) \( 2 T \sqrt{\frac{1}{14}} \quad \) (JEE Main)
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