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JAMB Physics 1979 Question 38

Question 38

Gas Laws

An air bubble rises from the bottom to the top of a water dam which is 40 m deep. The volume of the bubble just below the surface is 2.5 cm3. Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to 10 m of water.

  1. A.10.0 cm3
  2. B.2.0 cm3
  3. C.1.6 cm3
  4. D.0.625 cm3
  5. E.0.5 cm3
Show the answer and explanation

Answer: E (0.5 cm3)

Explanation

Pressure at the surface = 10 m of water; at the bottom = 10 + 40 = 50 m. Boyle's law: 10 × 2.5 = 50 × V, so V = 0.5 cm3.