A gas in a sealed cylinder is slowly expanded by pulling the piston outwards. The temperature of the gas remains constant.
Which statement about the gas is correct?
The pressure of the gas increases because its molecules now travel more quickly.
The pressure of the gas decreases because its molecules now hit the cylinder walls less frequently.
The pressure of the gas decreases because its molecules now travel more slowly.
The pressure of the gas increases because the molecules are closer together.
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.