A bubble is at the bottom of the lake of depth \( \mathrm{h} \). As the bubble comes to sea leve...

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A bubble is at the bottom of the lake of depth \( \mathrm{h} \). As the bubble comes to sea level, its radius increases three times. If atmospheric pressure is equal to \( l \) metres of water column, then \( \mathrm{h} \) is equal to:
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