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PHYSICS

JAMB 2020 - Question 13

Physics 2020 JAMB Past Questions - Question 13: in the J-tube above, Y and X are on the same horizontal level and 30cm³ of air is trapped above Y when the atmosphere pressure is 75cmHg. calculate the volume of air trapped above Y when 15cmHg is now poured into the limb above X.

Choose the most appropriate option for the gap .

in the J-tube above, Y and X are on the same horizontal level and 30cm³ of air is trapped above Y when the atmosphere pressure is 75cmHg. calculate the volume of air trapped above Y when 15cmHg is now poured into the limb above X.

A: 15cm³

B: 25cm³

C: 35cm³

D: 45cm³

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Correct Answer

Explanation

pressure at Y = 75 + 15 = 90cm p1v1 = p₂v₂ ; 75 x 30 = 90 x V₂ v₂ = 25cm³