Work done in a polytropic process (P V^n constant or V proportional to a power of T)

1. A.
   $2\left( P_{1}{\text{ }V}_{1} - P_{2}{\text{ }V}_{2} \right)$
2. B.
   $2\left( P_{2}{\text{ }V}_{2} - P_{1}{\text{ }V}_{1} \right)$
3. C.
   $2\left( \sqrt{P_{1}}V_{1} - \sqrt{P_{2}}V_{2} \right)$
4. D.
   $2\left( P_{2}\sqrt{V_{2}} - P_{1}\sqrt{V_{1}} \right)$

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