Physics (AS & A Level) · Oct / Nov 2025 · Paper 42 · Question 4

A cylinder contains a fixed mass of an ideal gas at pressure 2Y and volume 6X. The gas undergoes a sequence of changes from its initial state A, through states B, C and D, then finally back to its initial state A, as shown in Fig. 4.1. 0 0 2X 4X 6X 8X volume pressure 2Y 4Y 6Y C B D A Fig. 4.1 Fig. 4.2 shows the variation with time of the internal energy of the gas. 0 time internal energy 60XY 40XY 20XY C B D A A Fig. 4.2

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