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In rising from the bottom of a lake to the top, the temperature of air bubble remains unchanged, but the diameter gets doubled. If h is the barometric height (expressed in metres of mercury of relative density r ) at surface of the lake, the depth of the lake is

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In rising from the bottom of a lake to the top, the temperature of air bubble remains unchanged, but the diameter gets doubled. If h is the barometric height (expressed in metres of mercury of relative density r ) at surface of the lake, the depth of the lake is






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