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A metallic sphere is hung from a spiral ...

A metallic sphere is hung from a spiral spring and it executes vertical vibrations with a period T. The ball is now completely immersed into a non viscous liquid whose density is `(1/20)th`of that of the material of sphere. Then the time period of the vibrations of this sphere immersed in the liquid is

A

`T`

B

`20/ 19 T`

C

`sqrt (( 20/19 T)`

D

`sqrt (( 19/20 T)`

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