First slide

Work done by gas

Question

An ideal monoatomic gas is taken round the cycle ABCDA as shown in following P-V diagram. The work done during the cycle is

Moderate

A

PV
B

2 PV
C

4 PV
D

zero

Solution

Work done = Area of curve enclosed
= 2V $\times 2 P = 4 PV$

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