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An air bubble of volume 2 cm\(^3\) is formed 20 m under water. What will be...

Physics
WAEC 2025

An air bubble of volume 2 cm\(^3\) is formed 20 m 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 10 m of water?

  • A. 3 cm\(^3\)
  • B. 4 cm\(^3\)
  • C. 6 cm\(^3\)
  • D. 2 cm\(^3\)
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Correct Answer: Option C
Explanation

P\(_1\) = 20 m + 10 m = 30 m = 3000 cm

V\(_1\) = 2 cm\(^3\) 

P\(^2\) = 10 m = 1000 cm

V\(_2\) = ?

P\(_1\)V\(_1\) = P\(_2\)V\(_2\) 

3000 × 2 = 1000 × V\(_2\) 

V\(_2\) = \(\frac{3000 \times 2}{1000}\)

∴ V\(_2\) = 6 cm\(^3\)


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