Radius of an air bubble at the bottom of the lake is $r$ and it becomes $ 2r $ when the air bubbles rises to the top surface of the lake. If $P $ $cm$ of water be the atmospheric pressure, then the depth of the lake is
Radius of an air bubble at the bottom of the lake is $r$ and it becomes $ 2r $ when the air bubbles rises to the top surface of the lake. If $P $ $cm$ of water be the atmospheric pressure, then the depth of the lake is
- A
$2p$
- B
$8p$
- C
$4p$
- D
$7p$
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