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A pendulum that beats seconds on the sur...

A pendulum that beats seconds on the surface of the earth were taken to a depth of `(1//3)` th the radius of the earth. What will be its time period of oscillation?

A

`sqrt(6)sec`

B

`sqrt(5)sec`

C

`sqrt(2)sec`

D

`sqrt(3)sec`

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The correct Answer is:
A
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