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Q.

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

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a

2p

b

8p

c

4p

d

7p

answer is D.

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Detailed Solution

P1V1=P2V2 P+H4πr33=P4π2r33 P+H=8P H=7P
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