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JAMB Physics 1985 Question 14

Question 14

Pressure

Two divers G and H are at depths 20 m and 40 m respectively below the water surface in a lake. The pressure on G is P1 while the pressure on H is P2. If the atmospheric pressure is equivalent to 10 m of water, then the value of P2/P1 is

  1. A.0.50
  2. B.0.60
  3. C.1.67
  4. D.2.00
  5. E.3.00
Show the answer and explanation

Answer: C (1.67)

Explanation

Total pressure includes the atmosphere: P1 = 20 + 10 = 30 m of water and P2 = 40 + 10 = 50 m. P2/P1 = 50/30 ≈ 1.67.