When an air bubble rises from the bottom of a deep lake to a point just below the water surface,the pressure of air inside the bubble

  • A
    is greater than the pressure outside it
  • B
    is less than the pressure outside it
  • C
    decreases as the bubble moves up
  • D
    $A$ and $C$ both

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$A$ soap bubble of radius $1.0 \text{ cm}$ is formed inside another soap bubble of radius $2.0 \text{ cm}$. The radius of another soap bubble which has the same pressure difference as that between the inside of the smaller and outside of the large soap bubble, in metres is:

The excess pressure in a first soap bubble is three times that of another soap bubble. Then the ratio of the volume of the first bubble to the other is:

There are two liquid drops of different radii. The excess pressure inside over the outside is

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