A sealed air mattress contains a fixed mass of air. Its temperature remains constant while the pressure around it is reduced, so the mattress expands.
Which statement explains what happens to the impacts on a small area of the inner surface as the mattress expands?
The force of each impact decreases, and the time between successive impacts stays the same.
The force of each impact decreases, and the time between successive impacts increases.
The force of each impact is unchanged, and the time between successive impacts increases.
The force of each impact increases, and the time between successive impacts decreases.
108 exam-style questions on Edexcel GCSE Physics 14.3 Gas pressure and temperature, covering 14.3.1 Gas pressure and particle motion, 14.3.2 Temperature and pressure at constant volume, 14.3.3 Absolute zero and the kelvin scale, 14.3.4 Compressing and expanding gases, 14.3.5 Volume and pressure at constant temperature, and 14.3.6 Doing work on a gas. Each one has a worked solution and a mark scheme showing where the marks go.