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A simple pendulum oscillating in air has period T. The bob of the pendulum is completely immersed in a non-viscous liquid. The density of the liquid is 16 1 th of the material of the bob. If the bob is inside liquid all the time, its period of oscillation in this liquid is :

1. 14 1 T 2
2. 10 1 T 2
3. 15 1 T 4
4. 14 1 T 4

Correct answer: 15 1 T 4

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