A bubble of gas released at the bottom of a lake increases to four times its original volume when it reaches the surface. Assuming that atmospheric pressure is equivalent to the pressure exerted by a column of water 10 m high, what is the depth of the lake (in m)?

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answer is 30.

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Detailed Solution

P1 V1=P2 V2P×4 V=P1+h10V4=1+h10h = 30 m

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