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In rising from the bottom of a lake, to the top, the temperature of an air bubble remains unchanged, but its diameter gets doubled. If h is the barometric height (expressed in m of mercury of relative density ρ) at the surface of the lake, the depth of the lake is
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- 8 ρh m
- 7ρh m
- 9 ρh m
- 12 ρh m
Correct Option: B
| (hρ g + H × l × g) = | πr3 = hρ g × | π(2r)3 | ||
| 3 | 3 |
This gives H = 7hρ
