A-LevelPhysicsIdeal gases9702/12 · May/June 2012 · Q201 Mark

A mass of gas enclosed in a cylinder by a piston is heated gently. At the same time, the piston is moved so that the pressure remains constant. As a result of this, what will not occur?

AThe average velocity of the molecules will increase.

BThe mean separation of the molecules will increase.

CThe molecules will travel greater distances between collisions.

DThe number of collisions per second of the molecules on the piston will increase.

✓ Correct answer

D: The number of collisions per second of the molecules on the piston will increase.

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Topic: Ideal gases, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2012 Paper 1 Variant 2, question 20.

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