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The volume of an air bubblebecomes three...

The volume of an air bubblebecomes three times as it rises from the bootom of a lake to its surface. Assuming temperature to be constant and atmospheric pressure to be 75 cm of Hg and the density of water to be `1//10` of the density of the mercury, the depth of the lake is

A

10

B

15

C

20

D

25

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