Physics · Oct / Nov 2021 · Paper 11 · Question 9
5054Particle model
Air is trapped in a cylinder by a piston. The pressure of the air is $p$ and the length of the air column is 20 cm. The piston is moved outwards. The length of the air column increases by 40 cm. The temperature of the air remains constant. [diagram of cylinder with trapped air, piston, 20 cm and 40 cm dimensions] What is the new air pressure?
- A$\frac{p}{2}$
- B$\frac{p}{3}$
- C$2p$
- D$3p$
As printed in the paper
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Correct answer: B. $\frac{p}{3}$
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