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Some gas is present in J-shaped tube and...

Some gas is present in J-shaped tube and in this case level of mecury in both limbs of tube differ by `39` cm of Hg. If mercury is replaced by another liquid of density `(3)/(4)` of density of mercury then find the height difference in limbs. Assume temperature to be constant and smaller limb is closed, (density of mercury 13.6 g/mL)

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