The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different...

PHYSICS

WAEC 1991

The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere

A. 76cm of Hg
B. 75cm of Hg
C. 74cm of Hg
D. 60cm of Hg

Correct Answer: B. 75cm of Hg

Explanation

P₁ = p + 15, p₂ = p - 15

v₁ = 30cm, v₂ = 45cm

P₁v₁ = p₂v₂

p = 75cm of Hg

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