DP Physics (first assessment 2025)
Question EXE.2.SL.TZ0.7b
| Date | Example questions Example questions | Marks available | [Maximum mark: 3] | Reference code | EXE.2.SL.TZ0.7b |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Discuss | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 3]
EXE.2.SL.TZ0.7b
(b)
Discuss how the motion of the molecules of a gas gives rise to pressure in the gas.
[3]
Markscheme
The momentum of a molecule changes when it collides with a container wall ✓
From and Newton’s third law, this leads to a force exerted on the wall by the molecule ✓
The average force exerted by all the molecules on a unit area of the wall is equivalent to pressure ✓
