The state of a thermodynamic system changes from $(1)$ $(P_1, V)$ to $(2P_1, V)$ and $(2)$ $(P, V_1)$ to $(P, 2V_1)$. The work done during these two processes is respectively:
- AZero,Zero
- BZero,$PV_1$
- C$PV_1$,Zero
- D$PV_1$,$P_1V_1$
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