Exam-style question
Try this first
In the ideal gas model, what is assumed about the motion of gas particles? Scenario focus: use centripetal acceleration in a distinct A-Level Physics context and identify the relevant physical quantity before choosing the answer.
- A.They move in fixed positions.
- B.They move randomly and collide elastically.
- C.They move in a straight line only.
- D.They move slowly and steadily.
Model answer
What a good answer should say
- They move randomly and collide elastically.
Explanation
Why this works
The correct answer is They move randomly and collide elastically.. This option is correct for Thermal physics because it applies the centripetal acceleration idea in the stem and keeps the relevant quantity, unit, and physical conclusion together.
The alternatives either use a neighbouring formula, omit a required variable, or describe a different physical situation.
Common mistake
No common mistake is linked to this question yet.