The $PV$ diagram shows four different possible reversible processes performed on a monatomic ideal gas. Process $A$ is isobaric (constant pressure). Process $B$ is isothermal (constant temperature). Process $C$ is adiabatic. Process $D$ is isochoric (constant volume). For which process$(es)$ does the temperature of the gas decrease?
  • AProcess $A$ only
  • BProcess $C$ only
  • COnly Processes $C$ and $D$
  • DOnly Processes $B$, $C$ and $D$
Medium
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