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Q.

A bubble rises from the bottom of a 70 m deep lake and on reaching the surface, its volume becomes (take atmospheric pressure as that of 10 m column of water and assume that the temperature is constant)

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a

4 times

b

8 times

c

10 times

d

3 times

answer is B.

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Detailed Solution

inside pressure  =P0 +hdg and on the surface pressure is P0= 10 m of water pressure applying Boyle's law 10+70V1 = 10 V2 V2=8 V1
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