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The diameter of an air-bubble formed at ...

The diameter of an air-bubble formed at the bottom of a pond is `d=4mum`, when the bubble rises to the surface, its diameter increases `n=1.1` times. If expansion of air bubble is assumed to be isothermal and atmospheric pressure to be standard. How deep the pond at the spot is [surface tension of water `0.075(N)/(m)`]

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5 m
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