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Question

The Bat Life: Which amongst these graphs represent the process where the gas expands in the previous question?


A

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B

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C

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D

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Solution

The correct option is A


Since the pressure is not defined for the time between initial and final states, we can only mark these initial and the final states on the P-Vgraph.
For the other points (between the initial and final states) to be marked on the graph, the gas must be at equilibrium at states that are between the initial and final states (called boundary states).

In this example the gas is in equilibrium only in the boundary states. Hence only these states can be marked on the P-V graph.


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