Physics · Oct / Nov 2019 · Paper 12 · Question 20

A syringe containing air is sealed at one end. The piston is free to move. [diagram of a syringe with labels: air, piston, syringe] The air is heated. What happens to the average distance between air molecules and the density of the air?

1. Aaverage distance between air molecules: increases; density of the air: decreases
2. Baverage distance between air molecules: increases; density of the air: stays the same
3. Caverage distance between air molecules: stays the same; density of the air: decreases
4. Daverage distance between air molecules: stays the same; density of the air: stays the same

As printed in the paper