Physics · 2018
JEE Main · 15 April 2018, Shift 2 · Q9
When an air bubble of radius r rises from the bottom to the surface of a lake, its radius becomes (5 r)/4. Taking the atmospheric pressure to be…
When an air bubble of radius r rises from the bottom to the surface of a lake, its radius becomes $\displaystyle \frac{5 \mathrm{r}}{4}$. Taking the atmospheric pressure to be equal to $\displaystyle 10$ m height of water column, the depth of the lake would approximately be (ignore the surface tension and the effect of temperature) :
Official answer
(3)
9.$\displaystyle 5$ m
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.