When an air bubble of radius \( r \) rises from the \( \mathrm{P} \) bottom to the surface of a ...

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When an air bubble of radius \( r \) rises from the
\( \mathrm{P} \) bottom to the surface of a lake, its radius becomes

W.
\( \frac{5 r}{4} \). Taking the atmospheric pressure to be equal
to \( 10 \mathrm{~m} \) height of water column, the depth of the
lake would approximately be (ignore the suface tension and the effect of temperature) :
(1) \( 11.2 \mathrm{~m} \)
(2) \( 8.7 \mathrm{~m} \)
(3) \( 9.5 \mathrm{~m} \)
(4) \( 10.5 \mathrm{~m} \)
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