Q: A gas expands under constant pressure P from volume V1 to V2 . The work done by the gas is

(a) P (V2 – V1)

(b) P (V1 – V2)

(c) P (V1γ – V2γ )

(d) $P\frac{V_1 V_2}{V_2 – V_1}$

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Ans: (a)