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Q.

If an air bubble rises from the bottom of a mercury tank to the top its volume becomes 1/2 times the initial volume . When normal pressure is 76cm of Hg then the depth of the Hg tank is

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a

76 cm

b

132 cm

c

49 cm

d

38 cm

answer is A.

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Detailed Solution

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p1v2 =p2v2 at bottem  hρg×V=at the top 76ρg×V2                               h=38  

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If an air bubble rises from the bottom of a mercury tank to the top its volume becomes 1/2 times the initial volume . When normal pressure is 76cm of Hg then the depth of the Hg tank is