Physics · Oct / Nov 2020 · Paper 12 · Question 22
5054Particle model
A mass of gas is trapped inside a cylinder by a moving piston. As the piston moves in, the volume of the gas decreases but the temperature stays the same. What happens to the gas pressure, and why?
- Apressure: decreases; reason: the molecules have less room to move in the cylinder
- Bpressure: decreases; reason: the molecules move more slowly between collisions
- Cpressure: increases; reason: the molecules collide more frequently with the piston
- Dpressure: unchanged; reason: the temperature of the gas is constant
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Correct answer: C. pressure: increases; reason: the molecules collide more frequently with the piston
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