IB Physics HL B 3 6 Molecular Pressure Model Questions
Practise IB Physics HL B.3.6 by applying momentum transfer, Newton’s third law and molecular pressure models to wall forces.
- Syllabus
- First assessment 2025
- Course
- Physics HL
- Level
- HL
Exam points
- Derive pressure from molecular momentum changes and collision rates at container walls.
- Use Newton’s third law and P=ρv²/3 to analyse wall forces and kinetic-theory pressure changes.
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IB Physics HL B 3 6 Molecular Pressure Model Questions question 1
[Maximum number: 2]
The volume of the gas in (a) is increased to 6.8×10−4 m3 at constant temperature.
Explain, in terms of molecular motion, this change in pressure.
volume has increased and average velocity/KE remains unchanged, so molecules collide with the walls less frequently/there is a longer time between collisions with the walls
hence rate of change of momentum at the wall has decreased, and so pressure has decreased
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