Question

An air bubble starts rising from the bottom of a lake and its radius is doubled on reaching the surface. If the temperature is costant the depth of the lake is. (`1` atmospheric pressure `= 10m` height of water column)
A. `7m`
B. `70m`
C. `10m`
D. `0.7m`

Answer 1

Correct Answer - B
`P_(1)V_(1) = P_(2)V_(2) , (H + h)r_(1)^(3) = Hr_(2)^(3)`