An air bubble of volume 2 cm\(^3\) is formed 20m under water. What will be its volume when it rises to just below the surface of the water if the atmospheric pressure is equivalent to a height of 10m of water?

  • A 6cm3
  • B 4cm3
  • C 3cm3
  • D 2cm3
  • E 1cm3
waec 1995physics

The correct answer is A. 6cm3

P\(_1\)V\(_1\) = P\(_2\)V\(_2\)

When the bubble comes to the surface and pressure drops 3 times, the volume increases 3 times.

V\(_2\) = 3 x 2 

= 6 cm\(^3\)

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