A sealed metal canister of constant volume contains helium gas. The canister is placed in a refrigerator, causing the temperature of the gas to decrease.
What is the effect on the average speed of the helium atoms and the average distance between them?
Average speed decreases; average distance decreases
Average speed decreases; average distance stays the same
Average speed increases; average distance increases
Average speed increases; average distance stays the same
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.