A gas with a volume of $200\,\text{cm}^3$ is confined in a container by a piston. The piston is moved to the right, causing the gas volume to fall to $100\,\text{cm}^3$. The gas temperature does not change. Which row gives the effect of this on the kinetic energy of the gas particles and on the force per unit area produced by the particles colliding with the inner walls of the container?
- Akinetic energy doubles; force per unit area doubles
- Bkinetic energy doubles; force per unit area stays the same
- Ckinetic energy stays the same; force per unit area doubles
- Dkinetic energy stays the same; force per unit area stays the same